mRNA encoding influenza virus-like particles

Abstract

The present invention relates to messenger RNA (mRNA)-based immunogenic compositions capable of inducing mammalian cells to produce influenza virus-like particles (VLPs), comprising one or more mRNAs encoding influenza virus matrix 1 (M1) protein and one or more influenza virus hemagglutinin (HA) proteins and / or one or more influenza virus neuraminidase (NA) proteins.

Description

[Technical Field]

[0001] The present invention relates to a messenger RNA (mRNA)-based influenza vaccine that can induce mammalian cells to produce virus-like particles (VLPs). Because VLPs can express clusters of diverse epitopes on their surface but lack viral genetic material, the vaccine is expected to be effective against multiple influenza subtypes / strains, induce long-lasting immune responses, and ensure a higher safety profile than alternative vaccination strategies. [Background technology]

[0002] Influenza viruses are enveloped, negative-strand RNA viruses of the Orthomyxoviridae family. There are four types of influenza viruses: A, B, C, and D. Of these, only types A, B, and C are known to infect humans. Types A and B are the most commonly circulating types. Influenza A subtypes are classified based on the presence of two surface glycoproteins: hemagglutinin (HA) and neuraminidase (NA). Influenza B viruses are classified into two distinct lineages: influenza B / Yamagata lineage and influenza B / Victoria lineage. Influenza A viruses are further subdivided into 18 HA and 11 NA subtypes. The large number of potential subtypes is primarily responsible for the high antigenic variation observed in influenza viruses.

[0003] HA and NA are considered key determinants for productive infection and the establishment of host immune responses. HA is involved in the initial interaction between the virus and sialic acid on host cell receptors to facilitate viral entry. After HA-mediated binding to sialic acid residues, NA acts as a biological scissor, cleaving the sialic acid to promote virus release (Buffin et al., Vaccine. 2019:37(46):6857-6867; Cohen et al., Virology Journal 2013 10:321). The matrix 1 (M1) protein interacts with viral ribonucleoproteins and is closely associated with the inner surface of the viral membrane (Peukes et al., Nature. 2020;587:495-498). The matrix 2 (M2) protein is a structural transmembrane protein that forms a proton channel within the viral envelope (Pielak & Chou, Biochim Biophys Acta. 2011;1808(2):522-529).

[0004] The most commonly reported symptoms associated with influenza virus infection include upper respiratory tract signs of tracheobronchitis and pharyngitis, along with fever, fatigue, and myalgia. High-risk patient populations are more likely to present with severe disease phenotypes, such as pneumonia and acute respiratory distress syndrome, which can lead to hospitalization and possible death (Flerlage et al., Nat Rev Microbiol. 2021;19(7):425-441). It is estimated that over 3 to 5 million severe cases of influenza occur each year, with hundreds of thousands of these cases resulting in death (Ali & Cowling, Annu Rev Public Health. 2021;42:43-57).

[0005] Vaccination remains the most successful method for preventing influenza and reducing disease burden. Currently, several vaccine approaches are employed in immunization programs, including inactivated vaccines, live-attenuated vaccines, and subunit vaccines. None of the currently available influenza vaccines are particularly effective. This may be explained, at least in part, by inappropriate vaccine strain selection and the lag time between strain selection and vaccine delivery. For example, many current influenza vaccines are made by growing influenza viruses in pre-hatched chicken eggs, and the long production time makes it difficult to efficiently respond to newly emerging strains.

[0006] Thus, there remains a need for the development of influenza vaccines that can be deployed more rapidly against seasonally circulating strains and that are effective in preventing or reducing infection.

[0007] mRNA-based vaccines can be rapidly deployed, as demonstrated during the recent COVID-19 pandemic caused by the SARS-CoV-2 virus. Indeed, even though the virus was rapidly changing as it spread through the human population, mRNA-based vaccines remained effective in reducing the severity of infection. In addition, mRNA technology has made it possible to provide updated vaccines in a short period of time. Updated vaccines primarily contain mRNA sequences encoding the SARS-CoV-2 spike glycoprotein, including mutations acquired by the circulating virus.

[0008] An mRNA-based vaccine strategy is very attractive for preventing influenza infections or reducing the severity of these infections. Summary of the Invention [Means for solving the problem]

[0009] Virus-like particles (VLPs) have attracted the attention of vaccine researchers for decades due to their effectiveness in eliciting immune responses. However, the production of VLP-based vaccines remains challenging for most viruses, especially enveloped viruses, in part due to the difficulty of producing VLPs on a commercial scale.

[0010] This disclosure demonstrates that mRNA-based vaccine technology can be used to induce the expression of influenza VLPs in mammalian cells. Specifically, by transfecting mammalian cells with one or more messenger RNAs (mRNAs) encoding (i) the influenza virus matrix 1 (M1) protein and (ii) one or more influenza virus hemagglutinin (HA) proteins and / or one or more influenza virus neuraminidase (NA) proteins, the inventors were able to induce the production of VLPs in these cells that were highly similar in morphology and size to wild-type influenza viruses. Using this mRNA-based approach, the inventors were able to induce mammalian cells to produce VLPs containing HA and NA proteins from different influenza viruses.

[0011] Notably, at least one of the HA proteins and / or at least one of the NA proteins was from an influenza virus different from that from which the M1 protein was derived, indicating that a single M1 protein coding sequence may be sufficient to induce the formation of VLAs with multiple HA and NA proteins from different influenza viruses on their surface.

[0012] The compositions described herein can be designed to elicit effective immune responses against multiple influenza subtypes / strains. Because VLPs can express clusters of epitopes on their surface but lack complete viral genetic material, the compositions described herein (e.g., immunogenic compositions or vaccines) are expected to be highly immunogenic while maintaining a good safety profile.

[0013] In particular, the present invention relates to compositions (e.g., immunogenic compositions or vaccines) comprising one or more messenger RNAs (mRNAs) encoding (i) influenza virus matrix 1 (M1) protein and (ii) one or more influenza virus hemagglutinin (HA) proteins and / or one or more influenza virus neuraminidase (NA) proteins, wherein the M1 protein and one or more HA proteins and / or one or more NA proteins are capable of inducing mammalian cells to produce virus-like particles (VLPs).

[0014] In some embodiments, the VLPs are about 50 nm to about 200 nm in size, hi some embodiments, the VLPs are about 100 nm in size.

[0015] In some embodiments, the mammalian cell is a human cell.

[0016] In some embodiments, the one or more mRNAs encode two or more HA proteins and / or two or more NA proteins, and each of the two or more HA proteins and each of the two or more NA proteins is from a different influenza virus.

[0017] In some embodiments, at least one of the two or more HA proteins and / or at least one of the two or more NA proteins are from an influenza virus different from the influenza virus from which the M1 protein is derived. In some embodiments, the two or more HA proteins and / or the two or more NA proteins are from different influenza A subtypes. In some embodiments, at least one of the two or more HA proteins and / or at least one of the two or more NA proteins is from an influenza B virus.

[0018] In some embodiments, the M1 protein is from a pandemic influenza virus (e.g., A / California / 07 / 2009). In some embodiments, the M1 protein is from an H1N1 influenza A virus. In some embodiments, the M1 protein has a serine at position 30, an alanine at position 142, an asparagine at position 207, and a threonine at position 209. In some embodiments, the M1 protein is encoded by a separate mRNA.

[0019] In some embodiments, at least one of the two or more NA proteins has an activity of 2000 micromoles / hour (μM / hr) or greater as determined by a neuraminidase activity assay. In some embodiments, the two or more NA proteins comprise two NA proteins from different influenza A subtypes. In some embodiments, the different influenza A subtypes are N1 and N2. In some embodiments, the composition (e.g., immunogenic composition or vaccine) is capable of inducing expression of VLPs in mammalian cells, wherein the VLPs comprise two NA proteins from different influenza A subtypes.

[0020] In some embodiments, the two or more HA proteins comprise two HA proteins from different influenza A subtypes. In some embodiments, the different influenza A subtypes are H1 and H3. In some embodiments, the composition (e.g., immunogenic composition or vaccine) is capable of directing the expression of a VLP in a mammalian cell, wherein the VLP comprises two HA proteins from different influenza A subtypes.

[0021] In some embodiments, the one or more mRNAs are encapsulated within one or more lipid nanoparticles (LNPs).

[0022] In some embodiments, each HA protein and each NA protein is encoded by a separate mRNA. In some embodiments, a composition (e.g., an immunogenic composition or vaccine) comprises 3, 4, 5, 6, 7, 8, or 9 mRNA molecules encoding M1 proteins, and (i) 2, 3, 4, 5, 6, 7, or 8 HA proteins, (ii) 2, 3, 4, 5, 6, 7, or 8 NA proteins, or (iii) 1, 2, 3, or 4 HA proteins and 1, 2, 3, or 4 NA proteins. In some embodiments, the 3, 4, 5, 6, 7, 8, or 9 mRNAs are encapsulated in the same LNP.

[0023] In some embodiments, a composition (e.g., an immunogenic composition or vaccine) comprises one mRNA encoding an M1 protein and at least one mRNA encoding one HA protein and one NA protein, in some embodiments, the mRNAs are encapsulated in the same LNP.

[0024] In some embodiments, a composition (e.g., an immunogenic composition or a vaccine) comprises a first mRNA encoding a first HA protein and a first NA protein, a second mRNA encoding a second HA protein and a second NA protein, and a third mRNA encoding an M1 protein, wherein the first HA protein and the first NA protein are from a first influenza virus and the second HA protein and the second NA protein are from a second influenza virus.

[0025] In some embodiments, the first and second influenza viruses are different subtypes of influenza A. In some embodiments, the different subtypes are H1N1 and H3N2.

[0026] In some embodiments, the composition (e.g., immunogenic composition or vaccine) further comprises a fourth mRNA encoding a third HA protein and a third NA protein, wherein the third HA protein and the third NA protein are from a third influenza virus. In some embodiments, the third influenza virus is an influenza B virus.

[0027] In some embodiments, the composition (e.g., immunogenic composition or vaccine) further comprises a fifth mRNA encoding a fourth HA protein and a fourth NA protein, wherein the fourth HA protein and the fourth NA protein are from a fourth influenza virus. In some embodiments, the third and fourth influenza viruses are of the influenza B / Yamagata lineage and influenza B / Victoria lineage, respectively.

[0028] In some embodiments, where applicable, one of the first, second, fourth, and fifth mRNAs comprises, in 5' to 3' order, (i) a coding sequence for an HA protein, (ii) a nucleotide sequence encoding an internal ribosome entry site (IRES) or a 2A peptide, and (iii) a coding sequence for an NA protein.

[0029] In some embodiments, where applicable, the first, second, third, fourth and fifth mRNAs are encapsulated in the same LNP.

[0030] In some embodiments, the first, second, and third mRNAs are encapsulated in a first LNP, and the fourth and fifth mRNAs are encapsulated in a second LNP. In some embodiments, the second LNP further comprises a sixth mRNA encoding an M1 protein. In some embodiments, the M1 protein encoded by the sixth mRNA is from influenza B virus. In some embodiments, the first LNP and the second LNP comprise the same lipid component.

[0031] In some embodiments, the composition (eg, immunogenic composition or vaccine) further comprises an mRNA that further encodes influenza virus matrix 2 (M2) protein.

[0032] In some embodiments, one or more mRNAs are sequence-optimized.

[0033] In some embodiments, the mRNA comprises a polyadenylation (polyA) sequence comprising about 100 nucleotides to about 500 nucleotides. In some embodiments, the polyA sequence comprises about 200 nucleotides. In some embodiments, the polyA sequence comprises about 500 nucleotides.

[0034] In some embodiments, the lipid component of the LNP comprises or consists of cationic lipids, non-cationic lipids, PEG-modified lipids, and optionally sterol-based lipids.

[0035] In some embodiments, the cationic lipid is cKK-E12, cKK-E10, HGT5000, HGT5001, ICE, HGT4001, HGT4002, HGT4003, TL1-01D-DMA, TL1-04D-DMA, TL1-08D-DMA, TL1-10D-DMA, OF-Deg-Lin, OF-02, GL-HEPES-E3-E12-DS-4-E10, GL-TES-SA-DMP-E18-2, GL-TES-SA-DME-E18-2, SY-3-E 14-DMAPr, TL1-10D-DMA, HEP-E3-E10, HEP-E4-E10, RL3-DMA-07D, RL2-DMP-07D, cHse-E-3-E10, cHse-E-3-E12, cDD-TE-4-E12, SI-4-E14-DMAPr, TL-1-12D-DMA, SY-010, SY-011, and 4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate (ALC-0315).

[0036] In some embodiments, the non-cationic lipid is selected from DSPC (1,2-distearoyl-sn-glycero-3-phosphocholine), DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine), DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine), DEPE 1,2-dierucoyl-sn-glycero-3-phosphoethanolamine, DOPC (1,2-dioleoyl-sn-glycero-3-phosphotidylcholine), DPPE (1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine), DMPE (1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine), and DOPG (1,2-dioleoyl-sn-glycero-3-phospho-(1'-rac-glycerol)).

[0037] In some embodiments, the PEG-modified lipid is selected from DMG-PEG-2K and 2-[(polyethylene glycol)-2000]-N,N-ditetradecylacetamide (ALC-0159).

[0038] In some embodiments, the sterol lipid is cholesterol.

[0039] In some embodiments, the cationic lipid is selected from cKK-E10, OF-02, GL-HEPES-E3-E12-DS-4-E10, and ALC-0315. In some embodiments, the PEG-modified lipid is selected from DMG-PEG2K or ALC-0159. In some embodiments, the non-cationic lipid is selected from DOPE or DSPC.

[0040] In some embodiments, the LNPs are about 70 nm to about 150 nm in size.

[0041] The present invention also relates to pharmaceutical compositions comprising a composition (e.g., an immunogenic composition) disclosed herein and one or more pharmaceutically acceptable excipients. In some embodiments, the one or more pharmaceutically acceptable excipients are selected from a salt, a sugar, a buffering agent, and combinations thereof. In some embodiments, the salt is sodium chloride, potassium chloride, or a combination of both. In some embodiments, the sugar is a disaccharide. In some embodiments, the disaccharide is sucrose or trehalose. In some embodiments, the buffering agent is selected from phosphate, Tris, imidazole, and histidine. In some embodiments, the buffering agent is phosphate or Tris.

[0042] The present invention also relates to methods of eliciting an immune response to one or more influenza viruses in a subject, the method comprising administering to the subject a composition (e.g., an immunogenic composition, a vaccine, or a pharmaceutical composition) disclosed herein. In some embodiments, the immune response is effective to reduce the severity of one or more symptoms of infection by one or more influenza viruses in the subject. In some embodiments, the immune response is effective to prevent infection by one or more influenza viruses in the subject.

[0043] In some embodiments, the subject is a human. In some embodiments, the subject is pregnant. In some embodiments, the subject is 65 years of age or older. In some embodiments, the subject is 70 years of age or older.

[0044] Embodiments of the present invention will now be described, by way of example only, with reference to the following drawings, in which: [Brief explanation of the drawings]

[0045] [Figure 1] The bar graph shows NA activity in the supernatant of HEK293T cells transfected with a single mRNA encoding the NA protein of subtype N1 or N2, or with multiple mRNAs encoding the HA, NA, and M1 proteins, as indicated. NA enzymatic activity is reported as μM / h, and the mean value (N=3) is shown above the bars. No NA activity was detected in the supernatant of mock-transfected HEK293T cells (no mRNA). PBS served as a negative control. [Figure 2] Figure 1 shows protein expression of H3 subtype HA proteins in lysates of HEK293T cells transfected with mRNA encoding the H3 subtype HA protein (H3) and one or more additional mRNAs encoding the H1 subtype HA protein (H1), M1 protein (M1), or one or more NA proteins (N1, N2), as indicated. Lysates were resolved on a gel. Western blots were performed using a polyclonal anti-H3 antibody. Mock-transfected cells (no mRNA) served as a negative control (NC). Purified VLPs obtained from HEK293T cells transiently transfected with expression plasmids encoding the H1, N1, H3, N2, and M1 proteins served as a positive control (PC). Gel lanes were loaded from left to right as follows: molecular weight marker (M); H3; H3 / M1; H3 / N2 / M1, H1N1 / H3N2 / M1; H1 / H3 / M1; negative control (NC); positive control (PC); molecular weight marker (M). [Figure 3]Representative cryo-transmission electron microscopy (Cryo-TEM) images of VLPs from the supernatants of mock-transfected and mRNA-transfected HEK293T cells are shown. The supernatants of the transfected cells were concentrated using an Amicon® ultracentrifugal filter with a 100 kDa pore size to remove cellular debris and small proteins. The concentrated VLPs were kept at -80°C for further examination. Panel A shows mock-transfected cells (no mRNA). Under these conditions, no VLPs were visible. In contrast, panel B shows the presence of spherical vesicles on the surface of cells transfected with separate mRNAs encoding influenza virus HA, NA, and M1 proteins (H3 / N2 / M1). Similarly, panel C shows the presence of spherical vesicles on the surface of cells transfected with separate mRNAs encoding the HA and NA proteins of two different influenza viruses (H1, H3, N1, and N2, respectively) and mRNA encoding the M1 protein. The VLPs have a size of approximately 100 nm, similar to that of influenza viruses. Notably, expression of HA and NA proteins from different influenza viruses did not interfere with VLP formation. [Figure 4] Figure 1 shows NA activity in the supernatant of Expi293F cells transfected with mRNA encoding the NA protein, mRNA encoding the HA protein, and mRNA encoding the M1 protein. The NA and HA proteins were adapted and derived from Darwin (type A), Wisconsin (type A), Phuket (type B), and Austria (type B) influenza strains, respectively. The M1 protein was from a different strain than the HA and NA protein sequences were derived from (see Example 6 for further details). NA enzymatic activity is reported as μM / h. No NA activity was detected in the supernatant of mock-transfected Expi293F cells (lipofectant only, negative control). Purified recombinant VLPs served as a positive control. [Figure 5]Figure 1 shows the expression of influenza A (Panel A) and B (Panel B) HA proteins in lysates and supernatants (SN; concentrated and unconcentrated) of Expi293F cells transfected with mRNA encoding the NA protein, mRNA encoding the HA protein, and mRNA encoding the M1 protein. The NA and HA proteins were adapted and derived from Darwin (Type A), Wisconsin (Type A), Phuket (Type B), and Austria (Type B) strains, respectively. The M1 protein was from a different strain than the HA and NA protein sequences were derived from (see Example 6 for further details). After gel separation, Western blots were performed using monoclonal anti-HA antibodies against Type A (Panel A) or Type B (Panel B). Mock-transfected cells (lipofectant only) served as a negative control. Recombinant influenza B HA (rHA_B) served as a positive control. Molecular weight markers (MW) were also included in separate lanes. The bands corresponding to the full-length HA and HA2 subunits are enclosed by dashed lines. [Figure 6] Figure 1 shows the expression of M1 protein in lysates and concentrated supernatants (Panel A) and non-concentrated supernatants (Panel B) of Expi293F cells transfected with mRNAs encoding the NA, HA, and M1 proteins. The NA and HA proteins were adapted and derived from Darwin (type A), Wisconsin (type A), Phuket (type B), and Austria (type B) strains, respectively. The M1 protein was derived from a different strain than the HA and NA protein sequences (see Example 6 for further details). After gel separation, Western blots were performed using a polyclonal anti-M1 antibody. Mock-transfected cells (lipofectant only) served as a negative control. Purified VLPs served as a positive control. Molecular weight markers (MW) were also included in separate lanes. M1 was detected in cell lysates and concentrated supernatants of transfected cells (Panel A), but not in non-concentrated supernatant samples (Panel B). [Figure 7-1]Representative cryo-transmission electron microscopy (Cryo-TEM) images from concentrated supernatants of mock-transfected and mRNA-transfected Expi293F cells are shown. Panel A shows mock-transfected cells (lipofectant only). Under these conditions, no VLPs were visible. Panels B–E show representative images of supernatants from Expi293F cells transfected with mRNAs encoding the NA, HA, and M1 proteins. The NA and HA proteins were adapted and derived from influenza strains Darwin (type A; panel B), Wisconsin (type A; panel C), Phuket (type B; panel D), and Austria (type B; panel E), respectively, as indicated in each panel. The M1 protein was from a different strain than the HA and NA protein sequences were derived from (see Example 6 for further details). In the supernatants of mock-transfected cells, only heterogeneous smooth vesicles (white arrows) (likely artifacts from the transfection process) and protein debris (black outlined arrows) were observed (see exemplary image in panel A). In each of the supernatants of mRNA-transfected cells, VLPs were detected (panels B-E; see solid black arrows). VLPs can be clearly distinguished from protein debris (black outlined arrows; see panels B-D) and smooth vesicles (white arrows; see panel E). VLPs had a size of approximately 50-150 nm. [Figure 7-2] Continued from Figure 7-1. DETAILED DESCRIPTION OF THE INVENTION

[0046] definition To facilitate understanding of the present invention, certain terms are first defined below. Further definitions for these and other terms are set forth throughout the specification.

[0047] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.

[0048] Unless specifically stated or clear from context, as used herein, the term "or" is understood to be inclusive, including both "or" and "and."

[0049] As used herein, the term "approximately" or "about," when used with respect to one or more values ​​of interest, refers to a value similar to the stated reference value. In certain embodiments, the term refers to a range of values ​​that falls within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, or less in either direction (greater or less) of the stated reference value, unless otherwise stated or apparent from the context.

[0050] Exemplary methods and materials are described below, although methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention. Generally, the nomenclature used in connection with and techniques of cell and tissue culture, molecular biology, virology, immunology, microbiology, genetics, analytical chemistry, synthetic organic chemistry, medicinal and pharmaceutical chemistry, and protein and nucleic acid chemistry and hybridization described herein are those commonly used and well known in the art. Enzymatic reactions and purification techniques are performed according to manufacturer's specifications, as commonly accomplished in the art, or as described herein.

[0051] As used herein, the term "mRNA" refers to a polyribonucleotide that encodes at least one polypeptide. As used herein, mRNA encompasses both modified and unmodified RNA. mRNA can contain one or more coding and non-coding regions. mRNA can be purified from natural sources, produced using recombinant expression systems, optionally purified, in vitro transcribed, or chemically synthesized. Where appropriate, for example, in the case of chemically synthesized molecules, mRNA can contain nucleoside analogs, such as analogs having chemically modified bases or sugars, backbone modifications, etc. mRNA sequences are presented in the 5' to 3' direction unless otherwise indicated. A typical mRNA includes a 5' cap, a 5' untranslated region (5' UTR), a protein-coding region, a 3' untranslated region (3' UTR), and a 3' tail. In some embodiments, the tail structure is a poly(C) tail. More typically, the tail structure is a poly(A) tail.

[0052] As used herein, the term "sequence-optimized" refers to a nucleotide sequence that has been modified relative to a naturally occurring or wild-type nucleic acid. Such modifications can include, for example, codon optimization and the use of 5' and 3' UTRs not normally associated with that naturally occurring or wild-type nucleic acid. As used herein, the terms "codon optimization" and "codon-optimized" refer to modifications of the codon composition of a naturally occurring or wild-type nucleic acid encoding a peptide, polypeptide, or protein that do not alter its amino acid sequence, thereby improving protein expression of the nucleic acid. In the context of the present invention, "codon optimization" can also refer to the process of filtering out suboptimal nucleotide sequences from a list of nucleotide sequences, such as by filtering for guanine-cytosine content, codon adaptability index, the presence of destabilizing nucleic acid sequences or motifs, and / or the presence of pause sites and / or termination signals, thereby arriving at one or more optimized nucleotide sequences.

[0053] As used herein, the term "template DNA" (or "DNA template") refers to a DNA molecule containing a nucleic acid sequence encoding an mRNA transcript to be synthesized by in vitro transcription (IVT). The template DNA is used as a template for IVT to produce the mRNA transcript encoded by the template DNA. The template DNA contains all the elements necessary for IVT, in particular a promoter element operably linked to the DNA sequence encoding the desired mRNA transcript for binding of a DNA-dependent RNA polymerase, such as T3, T7, or SP6 RNA polymerase. Furthermore, the template DNA may contain primer binding sites 5' and / or 3' to the DNA sequence encoding the mRNA transcript so that the identity of the DNA sequence encoding the RNA transcript can be determined, for example, by PCR or DNA sequencing. In the context of the present invention, "template DNA" may be a linear or circular DNA molecule. As used herein, the term "template DNA" may refer to a DNA vector, such as a plasmid DNA, containing a nucleic acid sequence encoding the desired mRNA transcript.

[0054] As used herein, the term "subject" refers to a mammal, such as a human or other animal. Typically, the subject is a human. The subject may be male or female and of any suitable age, including infants, juveniles, adolescents, adults, and geriatric subjects.

[0055] As used herein, the term "vaccine composition" or "vaccine" refers to a composition capable of generating a protective immune response in a subject. As used herein, a "protective immune response" refers to an immune response that protects a subject from infection (prevents infection or prevents the development of a disease associated with the infection) or alleviates the symptoms of infection (e.g., infection with an influenza virus). Vaccines can induce both prophylactic (preventive) and therapeutic responses.

[0056] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs and as commonly used in the art to which this application belongs. Publications and other reference materials mentioned herein to describe the background of the invention or to provide additional details regarding its practice are hereby incorporated by reference.

[0057] The present invention provides compositions (e.g., immunogenic compositions or vaccines) comprising one or more mRNAs encoding (i) influenza virus matrix 1 (M1) protein and (ii) one or more influenza virus hemagglutinin (HA) proteins and / or one or more influenza virus neuraminidase (NA) proteins, wherein the M1 protein and the one or more HA proteins and / or one or more NA proteins are capable of inducing mammalian cells to produce virus-like particles (VLPs).

[0058] virus-like particles Virus-like particles (VLPs) are structures that assemble upon expression of viral proteins and can mimic the structure of natural virions. They have a structure and shape similar to that of natural viruses, but lack the viral genome. VLPs of enveloped viruses typically contain a lipid membrane derived from the cell in which they are expressed. One or more viral glycoproteins are typically incorporated into the lipid membrane and serve as target antigens that can be recognized by immune cells to produce neutralizing antibodies.

[0059] Budding of influenza VLPs from cells depends on the expression of HA and NA, particularly the cytoplasmic tails of HA and NA. Efficient release of VLPs from the cell surface requires the presence of sialidase activity provided by HA and NA. In addition, efficient production of VLPs in mammalian cells, particularly human cells, depends on the presence of M1 protein. VLPs produced in the presence of M1 protein are very similar to intact VLPs.

[0060] Thus, in certain embodiments, the present invention provides compositions (e.g., immunogenic compositions or vaccines) comprising one or more mRNAs encoding (i) influenza virus matrix 1 (M1) protein, (ii) one or more influenza virus hemagglutinin (HA) proteins, and (iii) one or more influenza virus neuraminidase (NA) proteins. Such compositions are particularly effective for inducing mammalian, particularly human, cells to produce virus-like particles (VLPs). VLP production can be visualized using electron microscopy (EM) techniques, as described herein, e.g., in Examples 4 and 5. For example, HEK293 cells or other mammalian cells can be transfected with one or more mRNAs encoding the M1 protein, one or more HA proteins, and one or more NA proteins, and VLP production can be observed using cryo-EM techniques as described herein.

[0061] In some embodiments, the VLPs are about 50 nm to about 200 nm in size, hi a specific embodiment, the VLPs are about 100 nm in size.

[0062] M1 protein The matrix 1 (M1) protein is a 252-residue structural protein that forms a coat beneath the lipid bilayer of the virus particle. As a result, it does not experience the same evolutionary pressure as the surface proteins hemagglutinin (HA) and neuraminidase (NA). In fact, the M1 protein is one of the slowest evolving proteins encoded by the influenza virus genome. It is encoded by the M gene of the influenza virus genome. The M gene has been found to evolve 5 to 10 times slower than the HA gene.

[0063] The M1 protein contains both MHC class I and MHC class II T cell epitopes. A particularly common MHC class II T cell epitope overlaps with the nuclear transport sequence.

[0064] The high conservation of its amino acid sequence and the presence of T cell epitopes suggest that inclusion of mRNA encoding the M1 protein may be effective in eliciting immune responses against multiple strains of influenza virus.

[0065] In some embodiments, the M1 protein is from a pandemic influenza virus. In some embodiments, the M1 protein is from an H1N1 influenza A virus (e.g., A / California / 07 / 2009 or A / Puerto Rico / 8 / 1934). In some embodiments, the M1 protein is an M1 protein that includes the amino acid serine (S) at position 30, the amino acid alanine (A) at position 142, the amino acid asparagine (N) at position 207, and the amino acid threonine (T) at position 209. In some embodiments, the M1 protein is capable of forming VLPs that include the NA and HA proteins from any influenza A strain. In some embodiments, the M1 protein is capable of forming VLPs that include the NA and HA proteins from any influenza B strain.

[0066] When mammalian cells were transfected with one or more mRNAs encoding the HA protein, one or more mRNAs encoding the NA protein, and an mRNA encoding the M1 protein derived from H1N1 influenza A virus (A / California / 07 / 2009), the inventors observed efficient budding of VLPs at the plasma membrane, even when the HA and NA proteins were derived from influenza viruses other than A / California / 07 / 2009.

[0067] Hemagglutinin The hemagglutinin (HA) protein is an integral membrane protein associated with the viral envelope. HA is the major antigen of influenza viruses, outnumbering NA by 5-10 times on the virion surface. There are 18 known HA subtypes, subdivided into group 1 (H1, H2, H5, H6, H8, H9, H11, H12, H13, H16, H17, and H18) and group 2 (H3, H4, H7, H10, H14, and H15).

[0068] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises at least one mRNA encoding at least one HA protein of subtype H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16, H17, or H18. Common seasonal influenza A subtypes include H1 and H3. Accordingly, in some embodiments, at least one mRNA encodes at least one HA protein of subtype H1 or H3. Influenza A strains with pandemic potential may include H5, H7, H9, or H10 subtypes. Accordingly, in some embodiments, at least one mRNA encodes at least one HA protein of subtype H5, H7, H9, or H10.

[0069] More typically, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises multiple (e.g., two or more) mRNAs encoding HA proteins, each HA protein selected from a different subtype. The HA protein may be selected from any of subtypes H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16, H17, and H18. More generally, the multiple mRNAs encode at least one HA protein from each of groups 1 and 2. For example, the multiple mRNAs may encode an HA protein of subtype H1 and an HA protein of subtype H3.

[0070] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises at least one mRNA encoding at least one HA protein of an influenza B virus. In some embodiments, the influenza B virus is of the Yamagata lineage. In some embodiments, the influenza B virus is of the Victoria lineage. In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises one or more mRNAs encoding an HA protein of an influenza B / Yamagata lineage and an HA protein of an influenza B / Victoria lineage.

[0071] Neuraminidase The neuraminidase (NA) protein is another integral membrane protein associated with the viral envelope. NA assembles as a tetramer of four identical polypeptides folded into distinct structural domains, including the cytoplasmic tail, transmembrane region, stalk, and catalytic head. High sequence conservation has been observed in the N-terminal region of the cytoplasmic tail. There are 11 known NA subtypes (N1-N11). NA is involved in the removal of sialic acid from cellular receptors and the removal of newly synthesized HA and NA on nascent virions. This enzymatic activity prevents viral aggregation, prevents viral binding to dying host cells, and facilitates viral release and infection of new cellular targets.

[0072] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises at least one mRNA encoding at least one NA protein of subtype N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, or N11. For example, common seasonal influenza A subtypes include N1 and N2. Thus, in some embodiments, at least one mRNA encodes at least one NA protein of subtype N1 or N3. Influenza A strains with pandemic potential may include N1, N2, N3, N9, or N7. Thus, in some embodiments, at least one mRNA encodes at least one NA protein of subtype N1, N2, N3, N9, or N7.

[0073] More typically, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises multiple (e.g., two or more) mRNAs encoding NA proteins, each NA protein selected from a different subtype. The NA protein may be selected from any of the subtypes N1, N2, N3, N4, N5, N6, N7, N8, N9, N10, and N11. More commonly, the multiple mRNAs encode at least one NA protein of the N1 subtype and at least one NA protein of the N2 subtype.

[0074] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises at least one mRNA encoding at least one NA protein of an influenza B virus. In some embodiments, the influenza B virus is of the Yamagata lineage. In some embodiments, the influenza B virus is of the Victoria lineage. In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises one or more mRNAs encoding the NA protein of influenza B / Yamagata lineage and the NA protein of influenza B / Victoria lineage.

[0075] The present inventors have observed that the NA protein of influenza A subtype N2 strains can be 2.5 to 3 times more active than the NA protein of influenza A subtype N1. Therefore, it may be desirable to include an mRNA encoding a highly active NA protein (e.g., 2000 μM / hr or higher) in combination with an mRNA encoding a lower activity NA protein (e.g., less than 1000 μM / hr) to ensure efficient budding of VLPs from cells transfected with the mRNA. Thus, in some embodiments, compositions of the present invention (e.g., immunogenic compositions or vaccines of the present invention) comprise at least one mRNA encoding a highly active NA protein (e.g., an N2 subtype NA protein) and at least one mRNA encoding a low activity NA protein (e.g., an N1 subtype NA protein). The enzymatic activity of the NA protein can be determined as described herein, for example, as described in Example 2. Specifically, the activity of the NA protein can be determined using a fluorescence-based assay using 4-methylumbelliferone-N-acetylneuraminic acid (MUNANA) as a substrate.

[0076] M2 protein Co-expression of the HA and NA proteins with influenza virus matrix 2 (M2) protein can further enhance the release of these proteins from host cells.

[0077] VLP-forming composition VLP-forming compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) typically comprise multiple mRNAs encoding an M1 protein, one or more HA proteins, and one or more NA proteins. The one or more HA proteins and the one or more NA proteins can be encoded by the same mRNA or by separate mRNAs. In some embodiments, each HA protein and each NA protein is encoded by a separate mRNA.

[0078] Typically, the M1 protein is encoded by a separate mRNA. In some embodiments, the M1 protein is from an influenza virus that is different from the influenza virus from which at least one HA protein and / or at least one NA protein encoded by one or more other mRNAs in the composition (e.g., an immunogenic composition or a vaccine) are derived. In some embodiments, the M1 protein is from an H1N1 influenza A virus (e.g., A / California / 07 / 2009) and / or comprises the amino acid serine (S) at position 30, the amino acid alanine (A) at position 142, the amino acid asparagine (N) at position 207, and the amino acid threonine (T) at position 209.

[0079] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises an M1 protein and two, three, four, five, six, seven, eight, nine, or more mRNA molecules encoding (i) one or more HA proteins, (ii) one or more NA proteins, or (iii) a combination of one or more HA proteins and NA proteins.

[0080] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises an M1 protein and 3, 4, 5, 6, 7, 8, 9, or more mRNA molecules encoding (i) two or more HA proteins, (ii) two or more NA proteins, or (iii) at least one HA protein and at least one NA protein.

[0081] In some embodiments, the HA and NA proteins are from an influenza A virus. In some embodiments, one or more HA proteins comprise an H1 subtype and one or more NA proteins comprise an N1 subtype. In some embodiments, one or more HA proteins comprise an H2 subtype and one or more NA proteins comprise an N2 subtype. In some embodiments, one or more HA proteins comprise an H5 subtype and one or more NA proteins comprise an N1 subtype. In some embodiments, one or more HA proteins comprise an H3 subtype and one or more NA proteins comprise an N2 subtype. In some embodiments, one or more HA proteins comprise an H7 subtype and one or more NA proteins comprise an N3, N7, or N9 subtype. In some embodiments, one or more HA proteins comprise an H9 subtype and one or more NA proteins comprise an N2 subtype. In some embodiments, one or more HA proteins comprise an H10 subtype and one or more NA proteins comprise an N7 subtype.

[0082] In some embodiments, the one or more HA proteins comprise subtypes H1 and H3, and the one or more NA proteins comprise subtypes N1 and N2. In some embodiments, the one or more HA proteins comprise an HA protein of influenza B / Yamagata lineage or influenza B / Victoria lineage. In some embodiments, the one or more NA proteins comprise an NA protein of influenza B / Yamagata lineage or influenza B / Victoria lineage. In some embodiments, the one or more HA proteins comprise an HA protein of subtypes H1 and H3 and one or both of influenza B / Yamagata lineage or influenza B / Victoria lineage, and the one or more NA proteins comprise an HA protein of subtypes N1 and N2 and one or both of influenza B / Yamagata lineage or influenza B / Victoria lineage.

[0083] In one embodiment, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises one mRNA molecule encoding an H3 HA protein, one mRNA molecule encoding an H1 HA protein, one mRNA molecule encoding an HA protein of influenza B / Yamagata lineage, one mRNA molecule encoding an HA protein of influenza B / Victoria lineage, and one mRNA molecule encoding an M1 protein.

[0084] In one embodiment, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises one mRNA encoding an H3 HA protein, one mRNA encoding an N2 NA protein, one mRNA encoding an H1 HA protein, one mRNA encoding an N1 NA protein, one mRNA encoding an HA protein from influenza B / Yamagata lineage, one mRNA encoding an NA protein from influenza B / Yamagata lineage, one mRNA encoding an HA protein from influenza B / Victoria lineage, one mRNA encoding an NA protein from influenza B / Victoria lineage, and one mRNA encoding an M1 protein.

[0085] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises a first mRNA encoding a first HA protein and a first NA protein, a second mRNA encoding a second HA protein and a second NA protein, and a third mRNA encoding an M1 protein. Typically, the first HA protein and the first NA protein are from a first influenza virus (e.g., H1 and N1 from influenza A) and the second HA protein and the second NA protein are from a second influenza virus (e.g., H3 and N2 from influenza A).

[0086] In some embodiments, the first influenza virus is an H1N1 influenza A virus and the second influenza virus is an H3N2 influenza A virus. In some embodiments, the first influenza virus is an influenza A virus (e.g., H1N1 or H3N2) and the second influenza virus is an influenza B virus (e.g., influenza B / Yamagata or influenza B / Victoria).

[0087] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises a fourth mRNA encoding a third HA protein and a third NA protein from a third influenza virus. In some embodiments, the first influenza virus is an H1N1 influenza A virus, the second influenza virus is an H3N2 influenza virus, and the third influenza virus is an influenza B virus (e.g., influenza B / Yamagata or influenza B / Victoria).

[0088] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises a fourth mRNA encoding a third HA protein and a third NA protein from a third influenza virus, and a fifth mRNA encoding a fourth HA protein and a fourth NA protein from a fourth influenza virus. In some embodiments, the first influenza virus is an H1N1 influenza A virus, the second influenza virus is an H3N2 influenza A virus, the third influenza virus is an influenza B virus of the Yamagata lineage, and the fourth influenza virus is of the Victoria lineage.

[0089] In some embodiments, the bicistronic first, second, fourth, and fifth mRNAs contain an internal ribosome entry site (IRES) between the two coding sequences encoding the HA and NA proteins, which functions as a second ribosome recruitment site, allowing translation initiation to occur additionally at internal regions of the mRNA.

[0090] In some embodiments, the IRES is derived from a virus. In some embodiments, the virus is a ribovirus. In some embodiments, the ribovirus is a picornavirus, a hepacivirus, a pestivirus, a hepatitis virus, a flavivirus, or a retrovirus. In some embodiments, the ribovirus is a picornavirus. In some embodiments, the picornavirus is a dicistrovirus or an encephalomyocarditis virus (EMCV).

[0091] In some embodiments, the bicistronic first, second, fourth, and fifth mRNAs comprise a nucleotide sequence encoding a self-cleaving peptide between two coding sequences encoding the HA and NA proteins. In some embodiments, the self-cleaving peptide is a 2A peptide. In some embodiments, the self-cleaving peptide is a 2A peptide. A 2A peptide typically comprises approximately 18-25 amino acids. In some embodiments, the 2A peptide is derived from a virus. In some embodiments, the 2A peptide is P2A, T2A, E2A, or F2A.

[0092] During translation of the upstream coding sequence, the 2A peptide causes the ribosome to skip synthesis of a glycine and proline peptide bond at the C-terminus of the 2A peptide, resulting in separation between the 2A peptide and the protein encoded by the downstream coding sequence. As a result, the upstream protein contains residues derived from the 2A peptide at its C-terminus. The protein encoded by the downstream coding sequence also contains a proline derived from the 2A peptide at its N-terminus.

[0093] The coding sequences for the HA and NA proteins in a bicistronic mRNA can be arranged in either order (HA followed by NA, or NA followed by HA). Because HA proteins typically outnumber NA proteins by 5-10 fold on the surface of native virus particles, it can be advantageous to place HA first (i.e., at the 5' position of a polycistronic mRNA) so that the HA protein is expressed at higher levels than the NA protein.

[0094] For example, the coding sequence downstream of an IRES is typically expressed at a much lower level (typically 10-20%) compared to the upstream coding sequence in a bicistronic. Thus, a bicistronic mRNA containing the coding sequence for the HA protein, the IRES, and the coding sequence for the NA protein in 5'-3' order can result in the formation of VLPs containing the HA protein and the NA protein in a ratio similar to that of native virus particles.

[0095] Similarly, coding sequences downstream of a nucleotide sequence encoding a self-cleaving peptide are typically expressed at lower levels compared to the upstream coding sequence in a bicistronic sequence. For example, the N-terminus of the translation product of a 2A peptide typically accumulates in a 2- to 5-fold molar excess over that of the C-terminus of the 2A peptide. Thus, a bicistronic mRNA containing, in 5' to 3' order, a coding sequence for an HA protein, a nucleotide sequence encoding a self-cleaving peptide (e.g., a 2A peptide), and a coding sequence for an NA protein can similarly result in the formation of VLPs containing HA and NA proteins in a ratio similar to that of native virus particles.

[0096] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) comprises a second mRNA encoding at least a first HA protein and a second HA protein, a second mRNA encoding at least a first NA protein and a second NA protein, and a third mRNA encoding an M1 protein. Typically, the first HA protein and the second HA protein (and any additional HA proteins) are from different subtypes (e.g., H1 and H3 from influenza A) and / or different lineages (e.g., Victoria and Yamagata), and the first NA protein and the second NA protein (and any additional NA proteins) are from different subtypes (e.g., N1 and N2 from influenza A) and / or different lineages.

[0097] In some embodiments, the coding sequences for the first and second HA proteins (and any additional HA proteins) and / or the coding sequences for the first and second NA proteins (and any additional NA proteins) are separated by a nucleotide sequence encoding a self-cleaving peptide. In some embodiments, the self-cleaving peptide is a 2A peptide. The 2A peptide typically comprises about 18-25 amino acids. In some embodiments, the 2A peptide is derived from a virus. In some embodiments, the 2A peptide is P2A, T2A, E2A, or F2A.

[0098] In some embodiments, the first mRNA encoding the first and second HA proteins (and any additional HA proteins) and the second mRNA encoding the first and second NA proteins (and any additional NA proteins) comprise the same 5'UTR sequence. In some embodiments, the first mRNA encoding the first and second HA proteins and the second mRNA encoding the first and second NA proteins comprise different 5'UTR sequences. For example, using different 5'UTR sequences can be advantageous in achieving an HA to NA ratio similar to that found in native virus particles.

[0099] Coexpression of one or more HA proteins and one or more NA proteins with the M2 protein can further enhance VLP release from cells. Thus, a composition according to the present invention (e.g., an immunogenic composition or vaccine according to the present invention) can further comprise an mRNA encoding a matrix 2 (M2) protein. In influenza virus genomes, the M1 and M2 proteins are encoded in different but partially overlapping reading frames. Thus, in some embodiments, the M2 protein is encoded by the same mRNA as the M1 protein, replicating, for example, the arrangement of the coding sequences for the M1 and M2 proteins in the wild-type influenza virus genome. Alternatively, the M2 protein can be encoded by a separate mRNA.

[0100] Strain selection Influenza viruses are constantly evolving, thus requiring frequent updates of the virus strains included in seasonal influenza vaccines. The World Health Organization (WHO) monitors circulating respiratory viruses such as influenza and analyzes surveillance data to provide annual recommendations for influenza vaccine compositions. In some embodiments, one or more HA and NA proteins are from influenza virus strains recommended by the WHO in their annual recommendations for influenza vaccine compositions.

[0101] In certain embodiments, at least one of the one or more influenza virus proteins comprises an influenza virus HA protein and / or an influenza virus NA protein having a molecular sequence identified or designed from a machine learning model, and in certain embodiments, at least one of the one or more ribonucleic acid molecules encodes one or more influenza virus proteins having a molecular sequence identified or designed from a machine learning model.

[0102] In some embodiments, the composition further comprises one or more mRNA molecules encoding a machine-learned influenza virus HA having a molecular sequence identified or designed from a machine-learning model, wherein the one or more machine-learned influenza virus HAs may be selected from an H1 HA, an H3 HA, an HA from the influenza B / Victoria lineage, an HA from the influenza B / Yamagata lineage, or a combination thereof.

[0103] Any machine learning algorithm may be used to select one or more machine learning influenza virus HAs, for example, any of the machine learning algorithms and methods disclosed in PCT Publication Nos. WO 2021 / 080990 A1, entitled "Systems and Methods for Designing Vaccines," and WO 2021 / 080999 A1, entitled "Systems and Methods for Predicting Biological Responses," both of which are incorporated by reference in their entireties.

[0104] mRNA Structural elements of mRNA A typical mRNA according to the present invention comprises a 5' cap, a 5' untranslated region (5' UTR), a protein-coding region, a 3' untranslated region (3' UTR), and a 3' tail. The presence of the cap is important for providing resistance to nucleases found in most eukaryotic cells. The presence of the "tail" helps protect the mRNA from exonuclease degradation. In some embodiments, the 5' cap and / or 3' tail can be added after mRNA synthesis. In other embodiments, the 5' cap and / or 3' tail sequences are included in the DNA template sequence used in the in vitro transcription (IVT) reaction.

[0105] 5' Cap In a specific embodiment, an mRNA of the invention comprises a 5' cap having the following structure: [ka] .

[0106] A 5' cap can be added as follows: first, an RNA terminal phosphatase removes one of the terminal phosphate groups from the 5' nucleotide, leaving two terminal phosphates; subsequently, guanosine triphosphate (GTP) is added to the terminal phosphate by a guanylyltransferase, generating a 5'5'5 triphosphate linkage; and then the 7-nitrogen of guanine is methylated by a methyltransferase. Examples of cap structures include, but are not limited to, mG(5')ppp(5'(A, G(5')ppp(5')A, and G(5')ppp(5')G. Additional cap structures are described in published U.S. Patent Application Publication No. 2016 / 0032356 and published U.S. Patent Application Publication No. 2018 / 0125989, both of which are incorporated herein by reference.

[0107] 3' tail In typical embodiments, the tail structure of the mRNA comprises a poly(A) tail. In some embodiments, the tail structure of the mRNA comprises a poly(C) tail. In some embodiments, the tail structure comprises at least 50 adenosine or cytosine nucleotides. In typical embodiments, the tail structure is approximately 100-500 nucleotides in length. For example, a tail structure (e.g., a poly(A) tail) that is 100-250 nucleotides in length may be particularly useful for therapeutic uses of the mRNA.

[0108] The poly(A) or poly(C) tail on the 3' end of an mRNA typically contains at least 50 adenosine or cytosine nucleotides, at least 150 adenosine or cytosine nucleotides, at least 200 adenosine or cytosine nucleotides, at least 250 adenosine or cytosine nucleotides, at least 300 adenosine or cytosine nucleotides, at least 350 adenosine or cytosine nucleotides, at least 400 adenosine or cytosine nucleotides, at least 450 adenosine or cytosine nucleotides, or at least 500 adenosine or cytosine nucleotides, respectively. In some embodiments, the tail structure comprises a combination of poly(A) and poly(C) tails of various lengths as described herein. In some embodiments, the mRNA contains a poly(A) sequence comprising between 100 and about 500 nucleotides. In one embodiment, the mRNA contains a poly(A) sequence of about 200 nucleotides. In another embodiment, the mRNA contains a poly(A) sequence of about 500 nucleotides.

[0109] In some embodiments, the tail structure comprises at least 50%, 55%, 65%, 70%, 75%, 80%, 85%, 90%, 92%, 94%, 95%, 96%, 97%, 98%, or 99% adenosine nucleotides, hi some embodiments, the tail structure comprises at least 50%, 55%, 65%, 70%, 75%, 80%, 85%, 90%, 92%, 94%, 95%, 96%, 97%, 98%, or 99% cytosine nucleotides.

[0110] 5'UTR and 3'UTR In some embodiments, the mRNAs disclosed herein may include a 5' or 3' UTR that is derived from a gene that is distinct from the gene encoded by the mRNA transcript (i.e., the UTR is a heterologous UTR).

[0111] In certain embodiments, the 5' and / or 3' UTR sequences may be from stable (e.g., globin, actin, GAPDH, tubulin, histone, or citric acid cycle enzyme) mRNAs to enhance mRNA stability. For example, the 5' UTR sequence may include a subsequence of the CMV immediate early 1 (IE1) gene or a fragment thereof to improve nuclease resistance and / or improve the half-life of the mRNA. It is also contemplated that a sequence encoding human growth hormone (hGH) or a fragment thereof may be included at the 3' end or untranslated region of the mRNA. Generally, these modifications improve the stability and / or pharmacokinetic properties (e.g., half-life) of the mRNA compared to its unmodified counterpart, including modifications made to improve such mRNA resistance to in vivo nuclease digestion.

[0112] Exemplary 5'UTRs include sequences from the CMV immediate early 1 (IE1) gene (U.S. Patent Application Publication Nos. 2014 / 0206753 and 2015 / 0157565, each of which is incorporated herein by reference), or the sequence of SEQ ID NO: 4 disclosed in U.S. Patent Application Publication No. 2016 / 0151409, which is incorporated herein by reference.

[0113] In various embodiments, the 5'UTR can be from the 5'UTR of a TOP gene. TOP genes are typically characterized by the presence of a 5'-terminal oligopyrimidine (TOP) tract. Furthermore, most TOP genes are characterized by growth-related translational regulation. However, TOP genes with tissue-specific translational regulation are also known. In certain embodiments, the 5'UTR from the 5'UTR of a TOP gene lacks a 5'TOP motif (oligopyrimidine tract) (e.g., U.S. Patent Application Publication Nos. 2017 / 0029847, 2016 / 0304883, 2016 / 0235864, and 2016 / 0166710, each of which is incorporated herein by reference).

[0114] In certain embodiments, the 5'UTR is from the ribosomal protein large 32 (L32) gene (U.S. Patent Application Publication No. 2017 / 0029847, supra).

[0115] In certain embodiments, the 5'UTR is from the 5'UTR of the hydroxysteroid (17-b) dehydrogenase 4 gene (HSD17B4) (U.S. Patent Application Publication No. 2016 / 0166710, supra).

[0116] In certain embodiments, the 5'UTR is from the 5'UTR of the ATP5A1 gene (US Patent Application Publication No. 2016 / 0166710, supra).

[0117] In some embodiments, an internal ribosome entry site (IRES) is used in place of the 5'UTR.

[0118] Suitable 5'UTR and 3'UTR sequences for use in the present invention are described in WO 2012 / 075040, which is incorporated herein by reference. In some embodiments, the 5'UTR comprises the nucleic acid sequence set forth in SEQ ID NO: 1 of WO 2012 / 075040. In some embodiments, the 3'UTR comprises the nucleic acid sequence set forth in SEQ ID NO: 3 of WO 2012 / 075040.

[0119] Typically, from 5' to 3', the mRNA construct comprises a 5' cap as described in paragraph

[0111] Error! Reference not found, a 5' UTR as described in paragraph

[0124] , one or more coding sequences according to the present invention, a 3' UTR as described in paragraph

[0124] , and a poly(A) tail of 100 to 500 nucleotides.

[0120] nucleotide In some embodiments, the mRNA comprises naturally occurring nucleosides (or unmodified nucleotides; i.e., adenosine, guanosine, cytidine, and uridine). In some embodiments, the mRNA comprises one or more modified nucleosides, such as nucleotide analogs (e.g., adenosine analogs, guanosine analogs, cytidine analogs, or uridine analogs). The presence of one or more nucleoside analogs may render the mRNA more stable and / or less immunogenic than a control mRNA having the same sequence but containing only naturally occurring nucleosides.

[0121] In some embodiments, the mRNA comprises both unmodified and modified nucleosides. In some embodiments, one or more modified nucleosides are nucleoside analogs. In some embodiments, one or more modified nucleosides comprise at least one modification selected from a modified sugar and a modified nucleobase. In some embodiments, the mRNA comprises one or more modified internucleoside linkages.

[0122] In some embodiments, a modified nucleoside comprises at least one modification selected from a modified sugar and a modified nucleobase relative to a corresponding naturally occurring ribonucleotide.

[0123] The modified nucleoside can be a modified uridine, cytidine, adenine, or guanine. Some exemplary chemical modifications of nucleosides in mRNA molecules include, for example, pyridin-4-one ribonucleosides, 5-aza-uridine, 2-thio-5-aza-uridine, 2-thiouridine, 4-thiopseudouridine, 2-thiopseudouridine, 5-hydroxyuridine, 3-methyluridine, 5-carboxymethyluridine, 1-carboxymethyl-pseudouridine, 5-propynyl-uridine, 1-propynyl-pseudouridine, 5-taurinomethyluridine, 1- Taurinomethyl-pseudouridine, 5-taurinomethyl-2-thio-uridine, 1-taurinomethyl-4-thio-uridine, 5-methyl-uridine, 1-methyl-pseudouridine, 4-thio-1-methyl-pseudouridine, 2-thio-1-methyl-pseudouridine, 1-methyl-1-deaza-pseudouridine, 2-thio-1-methyl-1-deaza-pseudouridine, dihydrouridine, dihydropseudouridine, 2-thiodihydrouridine, 2-thio-dihydropseudouridine 2-Methoxyuridine, 2-Methoxy-4-thio-uridine, 4-Methoxy-pseudouridine, 4-Methoxy-2-thio-pseudouridine, 5-Aza-cytidine, Pseudoisocytidine, 3-Methyl-cytidine, N4-Acetylcytidine, 5-Formylcytidine, N4-Methylcytidine, 5-Hydroxymethylcytidine, 1-Methyl-pseudoisocytidine, Pyrrolo-cytidine, Pyrrolo-pseudoisocytidine, 2-Thio-cytidine, 2-Thio-5-methyl-cytidine, 4-Thio-cytidine pseudoisocytidine, 4-thio-1-methyl-pseudoisocytidine, 4-thio-1-methyl-1-deaza-pseudoisocytidine, 1-methyl-1-deaza-pseudoisocytidine, zebularine, 5-aza-zebularine, 5-methyl-zebularine, 5-aza-2-thio-zebularine, 2-thio-zebularine, 2-methoxy-cytidine, 2-methoxy-5-methyl-cytidine, 4-methoxy-pseudoisocytidine, 4-methoxy-1-methyl-pseudoisocytidine, 2-aminopurine, 2,6-Diaminopurine, 7-Deazaadenine, 7-Deaza-8-Aza-Adenine, 7-Deaza-2-aminopurine, 7-Deaza-8-Aza-2-aminopurine, 7-Deaza-2,6-Diaminopurine, 7-Deaza-8-Aza-2,6-Diaminopurine, 1-Methyladenosine, N, 6 -methyladenosine, N 6 -Isopentenyl adenosine, N 6 -(cis-Hydroxyisopentenyl)adenosine, 2-methylthio-N 6 -(cis-hydroxyisopentenyl)adenosine, N 6 -Glycinylcarbamoyl adenosine, N 6 -Threonylcarbamoyladenosine, 2-methylthio-N 6 -Threonylcarbamoyladenosine, N 6 ,N 6 -dimethyladenosine, 7-methyladenine, 2-methylthioadenine, 2-methoxyadenine, inosine, 1-methyl-inosine, uiosine, uibutosine, 7-deazaguanosine, 7-deaza-8-aza-guanosine, 6-thioguanosine, 6-thio-7-deazaguanosine, 6-thio-7-deaza-8-aza-guanosine, 7-methyl-guanosine, 6-thio-7-methylguanosine, 7-methylinosine, 6-methoxyguanosine, 1-methylguanosine, N 2 -methylguanosine, N 2 ,N 2 -dimethylguanosine, 8-oxo-guanosine, 7-methyl-8-oxo-guanosine, 1-methyl-6-thio-guanosine, N 2 -methyl-6-thio-guanosine, and N 2 ,N 2 -dimethyl-6-thio-guanosine.

[0124] In some embodiments, the modified nucleoside in the mRNA molecule is pseudouridine, pyridin-4-one ribonucleoside, 5-aza-uridine, 6-aza-uridine, 2-thio-5-aza-uridine, 2-thio-uridine, 4-thio-uridine, 4-thio-pseudouridine, 2-thio-pseudouridine, 5-hydroxyuridine, 5-aminoallyl-uridine, 5-halo-uridine (e.g., 5-iodouridine or 5-bromouridine), 3-methyluridine, 5-methoxy-uridine, uridine-5-oxyacetic acid, uridine-5-oxyacetic acid methyl ester, 5-carboxymethyl-uridine, 1-carboxymethyl-pseudouridine, 5-carboxyhydroxymethyluridine, 5-carboxyhydroxymethyluridine, 5-hydroxy ... Dimethyl-uridine methyl ester, 5-methoxycarbonylmethyluridine, 5-methoxycarbonylmethyl-2-thiouridine, 5-aminomethyl-2-thiouridine, 5-methylaminomethyluridine, 5-methylaminomethyl-2-thiouridine, 5-methylaminomethyl-2-selenouridine, 5-carbamoylmethyl-uridine, 5-carboxymethylaminomethyl-uridine, 5-carboxymethylaminomethyl-2-thiouridine, 5-propynyl-uridine, 1-propynyl-pseudouridine, 5-taurinomethyl-uridine, 1-taurinomethyl-pseudouridine, 5-taurinomethyl-2-thiouridine, 1-taurinomethyl-4-thio-pseudouridine, 5-methyl-uridine (m 5U, e.g., those having the nucleobase deoxythymidine), 1-methyl-pseudouridine, 5-methyl-2-thio-uridine, 1-methyl-4-thio-pseudouridine, 4-thio-1-methyl-pseudouridine, 3-methyl-pseudouridine), 2-thio-1-methyl-pseudouridine, 1-methyl-1-deaza-pseudouridine, 2-thio-1-methyl-1-deaza-pseudouridine, dihydrouridine, dihydrothio pseudouridine, 5,6-dihydrouridine, 5-methyl-dihydrouridine, 2-thio-dihydrouridine, 2-thio-dihydropseudouridine, 2-methoxy-uridine, 2-methoxy-4-thio-uridine, 4-methoxy-pseudouridine, 4-methoxy-2-thio-pseudouridine, N1-methyl-pseudouridine, 3-(3-amino-3-carboxypropyl)uridine, 1-methyl-3-(3-amino-3-carboxypropyl)uridine (2-O-methyl-2'-O-methyluridine, 5-methoxycarbonylmethyl-2'-O-methyluridine, 5-carbamoylmethyl-2'-O-methyluridine, 5-(isopropylaminomethyl)-2-thiouridine, alpha-thiouridine, 2'-O-methyluridine, 5,2'-O-dimethyluridine, 2'-O-methyl-pseudouridine, 2-thio-2'-O-methyluridine, 5-methoxycarbonylmethyl-2'-O-methyluridine, 5-carbamoylmethyl-2'-O-methyluridine , 5-carboxymethylaminomethyl-2'-O-methyluridine, 3,2'-O-dimethyluridine, 5-(isopentenylaminomethyl)-2'-O-methyluridine, 1-thio-uridine, deoxythymidine, 2'-F-ara-uridine, 2'-F-uridine, 2'-OH-ara-uridine, 5-(2-carbomethoxyvinyl)uridine, and 5-[3-(1-E-propenylamino)uridine]uridine.

[0125] In some embodiments, the modified uridine is selected from N1-methylpseudouridine, pseudouridine, 2-thiouridine, 4'-thiouridine, 2-thio-1-methyl-1-deaza-pseudouridine, 2-thio-1-methyl-pseudouridine, 2-thio-5-aza-uridine, 2-thio-dihydropseudouridine, 2-thio-dihydrouridine, 2-thio-pseudouridine, 4-methoxy-2-thio-pseudouridine, 4-methoxy-pseudouridine, 4-thio-1-methyl-pseudouridine, 4-thio-pseudouridine, 5-aza-uridine, dihydropseudouridine, 5-methyluridine, 5-methyluridine, 5-methoxyuridine, and 2'-O-methyluridine.

[0126] In some embodiments, the modified nucleoside is 5-aza-cytidine, 6-aza-cytidine, pseudoisocytidine, 3-methylcytidine, N 4 -acetylcytidine, 5-formyl-cytidine, N 4 -methylcytidine, 5-methylcytidine, 5-halocytidine (e.g., 5-iodocytidine), 5-hydroxymethylcytidine, 1-methyl-pseudoisocytidine, pyrrolo-cytidine, pyrrolo-pseudoisocytidine, 2-thio-cytidine, 2-thio-5-methylcytidine, 4-thio-pseudoisocytidine, 4-thio-1-methyl-pseudoisocytidine, 4-thio-1-methyl-1-deaza-pseudoisocytidine, 1- Methyl-1-deaza-pseudoisocytidine, Zebularine, 5-aza-zebularine, 5-methyl-zebularine, 5-aza-2-thiozebularine, 2-thio-zebularine, 2-methoxycytidine, 2-methoxy-5-methylcytidine, 4-methoxypseudoisocytidine, 4-methoxy-1-methyl-pseudoisocytidine, Lysidine, alpha-thio-cytidine, 2'-O-methylcytidine, 5,2'-O-dimethylcytidine, N 4 -acetyl-2'-O-methylcytidine, N 4 ,2'-O-dimethylcytidine, 5-formyl-2'-O-methylcytidine, N 4 ,N 4, a modified cytosine selected from 2'-O-trimethylcytidine, 1-thio-cytidine, 2'-F-ara-cytidine, 2'-F-cytidine, and 2'-OH-ara-cytidine.

[0127] In some embodiments, the modified nucleoside is a modified pyrimidine nucleoside. In some embodiments, the modified ribonucleoside is selected from pseudouridine, N1-methylpseudouridine, 5-methylcytidine, 5-methoxyuridine, and any combination thereof. In some embodiments, both cytosine and uracil are replaced with modified nucleosides (e.g., N1-methylpseudouridine and 5-methylcytidine).

[0128] In some embodiments, the modified nucleoside is 2-aminopurine, 2,6-diaminopurine, 2-amino-6-halopurine (e.g., 2-amino-6-chloropurine), 6-halopurine (e.g., 6-chloropurine), 2-amino-6-methylpurine, 8-azidoadenosine, 7-deaza-adenine, 7-deaza-8-azaadenine, 7-deaza-2-aminopurine, 7-deaza-8-aza-2-aminopurine, 7-deaza-2,6-diaminopurine, 7-deaza-8-aza-2,6-diaminopurine, 1-methyladenosine, 2-methyladenine, N 6 -Methyladenosine, 2-methylthio-N 6 -methyladenosine, N 6 -Isopentenyl adenosine, 2-methylthio-N 6 -Isopentenyl adenosine, N 6 -(cis-Hydroxyisopentenyl)adenosine, 2-methylthio-N 6 -(cis-hydroxyisopentenyl)adenosine, N 6 -Glycinylcarbamoyl adenosine, N 6 -Threonylcarbamoyladenosine, N 6 -methyl-N 6 -Threonylcarbamoyladenosine, 2-methylthio-N 6 -Threonylcarbamoyladenosine, N 6 ,N 6-Dimethyladenosine, N 6 -Hydroxynorvalylcarbamoyladenosine, 2-methylthio-N 6 -Hydroxynorvalylcarbamoyl adenosine, N 6 -acetyladenosine, 7-methyladenine, 2-methylthio-adenine, 2-methoxyadenine, alpha-thio-adenosine, 2'-O-methyladenosine, N 6 ,2'-O-dimethyladenosine,N 6 ,N 6 ,2'-O-trimethyladenosine, 1,2'-O-dimethyladenosine, 2'-O-ribosyladenosine (phosphate), 2-amino-N 6 -methylpurine, 1-thio-adenosine, 8-azido-adenosine, 2'-F-ara-adenosine, 2'-F-adenosine, 2'-OH-ara-adenosine, and N 6 -(19-amino-pentaoxanonadecyl)adenosine.

[0129] In some embodiments, the modified nucleoside is inosine, 1-methylinosine, uiosine, methyluiosine, 4-demethyluiosine, isouiosine, uibutosine, peroxyuibutosine, hydroxyuibutosine, undermodified hydroxyuibutosine, 7-deaza-guanosine, queosine, epoxyqueosine, galactosylqueosine, mannosylqueosine, 7-cyano-7-deaza-guanosine, 7-aminomethyl-7-deaza-guanosine, archaeosine, 7-deaza-8-aza-guanosine, 6-thio-guanosine, 6-thio-7-deaza-guanosine, 6-thio-7-deaza-8-aza-guanosine, 7-methylguanosine, 6-thio-7-methylguanosine, 7-methylinosine, 6-methoxyguanosine, 1-methylguanosine, N 2 -methyl-guanosine, N 2 ,N 2 -Dimethylguanosine, N 2,7 -Dimethylguanosine, N 2 ,N 2,7-dimethylguanosine, 8-oxo-guanosine, 7-methyl-8-oxo-guanosine, 1-methylguanosine, N 2 -methyl-6-thio-guanosine, N 2 ,N 2 -Dimethyl-6-thio-guanosine, alpha-thio-guanosine, 2'-O-methylguanosine, N 2 -methyl-2'-O-methylguanosine, N 2 ,N 2 -dimethyl-2'-O-methylguanosine, 1-methyl-2'-O-methylguanosine, N 2,7 -dimethyl-2'-O-methylguanosine, 2'-O-methylinosine, 1,2'-O-dimethylinosine, 2'-O-ribosylguanosine (phosphate), 1-thio-guanosine, O 6 -methylguanosine, 2'-F-araguanosine, and 2'-F guanosine.

[0130] In some embodiments, the modified nucleoside is a nucleoside analog selected from 2-aminoadenosine, inosine, pyrrolo-pyrimidine, 3-methyladenosine, 5-methylcytidine, C-5 propynyl-cytidine, C-5 propynyl-uridine, 2-aminoadenosine, C5-bromouridine, C5-fluorouridine, C5-iodouridine, C5-propynyl-uridine, C5-propynyl-cytidine, C5-methylcytidine, 2-aminoadenosine, 7-deazaadenosine, 7-deazaguanosine, 8-oxoadenosine, 8-oxoguanosine, O(6)-methylguanine, pseudouridine (e.g., N1-methylpseudouridine), 2-thiouridine, and 2-thiocytidine. See, for example, U.S. Pat. No. 8,278,036 or WO 2011 / 012316 for a discussion of 5-methylcytidine, pseudouridine, and 2-thio-uridine and their incorporation into mRNA.

[0131] In some embodiments, the modified nucleoside is selected from pseudouridine, N1-methylpseudouridine, 2-thiouridine, 4'-thiouridine, 5-methylcytosine, 2-thio-1-methyl-1-deaza-pseudouridine, 2-thio-1-methyl-pseudouridine, 2-thio-5-aza-uridine, 2-thio-dihydropseudouridine, 2-thio-dihydrouridine, 2-thio-pseudouridine, 4-methoxy-2-thio-pseudouridine, 4-methoxy-pseudouridine, 4-thio-1-methyl-pseudouridine, 4-thio-pseudouridine, 5-aza-uridine, dihydropseudouridine, 5-methyluridine, 5-methoxyuridine, and 2'-O-methyluridine.

[0132] In mRNAs for use in the present invention, modified nucleotides typically replace naturally occurring nucleotides. Thus, one or more mRNAs of the present invention can contain both unmodified and modified nucleotides. Such mRNAs can typically be prepared by including modified nucleotides in the IVT reaction mixture instead of naturally occurring nucleotides (e.g., N1-methylpseudouridine instead of uridine). This results in mRNA in which 100% of the naturally occurring nucleotides are replaced with the corresponding modified nucleotides (e.g., 100% of the uridines are replaced with N1-methylpseudouridine). In some embodiments, only a portion of the naturally occurring nucleosides (e.g., at least 1%, 5%, 10%, 15%, 20%, or 25% of the naturally occurring nucleosides) are replaced with modified nucleosides. In some embodiments, one or more naturally occurring nucleosides are replaced with modified ribonucleosides. For example, two or more ribonucleosides can be modified ribonucleosides (e.g., uridine can be replaced with 2-thio-uridine and cytidine can be replaced with 5-methylcytidine). For example, 25% of the uridine residues can be replaced with 2-thio-uridine and / or 25% of the cytidine residues can be replaced with 5-methylcytidine.

[0133] Generation of optimized nucleotide sequences In some embodiments, one or more mRNAs for use in the present invention are sequence-optimized.For example, the coding sequence of one or more mRNAs can be modified relative to their naturally occurring counterparts to (a) improve the yield of full-length mRNA during in vitro synthesis, and (b) maximize the expression of encoded proteins after delivery of the mRNA to target cells in vivo.Sequence motifs that promote rapid degradation of mRNA in target cells are also removed.

[0134] The process of generating optimized nucleotide sequences may include first generating a list of codon-optimized sequences and then applying three filters to the list: a motif selection filter, a guanine-cytosine (GC) content analysis filter, and a codon adaptation index (CAI) analysis filter, resulting in an updated list of optimized nucleotide sequences. The updated list no longer includes nucleotide sequences containing features that are expected to interfere with efficient transcription and / or translation of the encoded polypeptide.

[0135] Codon optimization The genetic code has 64 possible codons. Each codon contains a sequence of three nucleotides. The frequency of usage of each codon in the protein-coding region of the genome can be calculated by determining the number of instances in which a particular codon appears in the protein-coding region of the genome, and then dividing the resulting value by the total number of codons that code for the same amino acid in the protein-coding region of the genome.

[0136] Codon usage tables contain experimentally derived data on the frequency with which each codon is used to encode a particular amino acid for the particular biological source for which the table was generated. This information is expressed for each codon as a percentage (0-100%) or fraction (0-1) of the frequency with which that codon is used to encode a particular amino acid compared to the total number of times that codon encodes that amino acid.

[0137] Codon usage tables are stored in publicly available databases such as the Codon Usage Database (Nakamura et al. (2000) Nucleic Acids Research 28(1), 292; available online at https: / / www.kazusa.or.jp / codon / ) and the High-performance Integrated Virtual Environment-Codon Usage Tables (HIVE-CUTs) database (Athey et al., (2017), BMC Bioinformatics 18(1), 391; available online at http: / / hive.biochemistry.gwu.edu / review / codon).

[0138] During the first step of codon optimization, if a codon is associated with a codon usage frequency below a threshold usage frequency (e.g., 10%), the codon is removed from a first codon usage table reflecting the frequency of each codon in a given organism (e.g., a mammal or human). The codon usage frequencies of the codons not removed in the first step are normalized to generate a normalized codon usage table. An optimized nucleotide sequence encoding a target amino acid sequence is generated by selecting a codon for each amino acid in the amino acid sequence based on the usage frequency of one or more codons associated with the given amino acid in the normalized codon usage table. The probability of selecting a particular codon for a given amino acid is equal to the usage frequency associated with the codon associated with this amino acid in the normalized codon usage table.

[0139] The codon-optimized sequences of the present invention are generated by a computer-implemented method for generating optimized nucleotide sequences. The method includes: (i) receiving an amino acid sequence, where the amino acid sequence encodes a peptide, polypeptide, or protein; (ii) receiving a first codon usage table, where the first codon usage table includes a list of amino acids, each amino acid in the table associated with at least one codon, each codon associated with a usage frequency; (iii) removing from the codon usage table any codons associated with a usage frequency below a threshold usage frequency; (iv) normalizing the usage frequencies of codons not removed in step (iii) to generate a normalized codon usage table; and (v) generating an optimized nucleotide sequence encoding the amino acid sequence by selecting codons for each amino acid in the amino acid sequence based on the usage frequencies of one or more codons associated with the amino acids in the normalized codon usage table. The threshold usage frequency can be in the range of 5% to 30%, and can be 5%, 10%, 15%, 20%, 25%, or 30%. In the context of the present invention, the threshold usage frequency is typically 10%.

[0140] The step of generating a normalized codon usage table includes: (a) distributing the usage frequency of each codon associated with the first amino acid and removed in step (iii) among the remaining codons associated with the first amino acid; and (b) repeating step (a) for each amino acid to generate a normalized codon usage table. In some embodiments, the usage frequency of the removed codon is distributed evenly among the remaining codons. In some embodiments, the usage frequency of the removed codon is distributed proportionally among the remaining codons based on the usage frequency of each remaining codon. "Distributed" in this context may be defined as taking the size of the total usage frequency of the removed codons associated with a particular amino acid and assigning a portion of this combined frequency to each of the remaining codons that encode a particular amino acid.

[0141] The step of selecting a codon for each amino acid includes: (a) identifying one or more codons associated with a first amino acid in the amino acid sequence in a normalized codon usage table; (b) selecting a codon associated with the first amino acid, wherein the probability of selecting a particular codon is equal to the frequency of usage associated with the codon associated with the first amino acid in the normalized codon usage table; and (c) repeating steps (a) and (b) until a codon has been selected for each amino acid in the amino acid sequence.

[0142] The step of generating an optimized nucleotide sequence by selecting a codon for each amino acid in the amino acid sequence (step (v) in the above method) is carried out n times to generate a list of optimized nucleotide sequences.

[0143] Motif Screening A motif screening filter is applied to the list of optimized nucleotide sequences, and optimized nucleotide sequences encoding any known negative cis-regulatory elements and negative repeat elements are removed from the list to generate an updated list.

[0144] For each optimized nucleotide sequence in the list, it is also determined whether it contains a stop signal. Any nucleotide sequence containing one or more stop signals is removed from the list, generating an updated list. In some embodiments, the stop signal has the following nucleotide sequence: 5'-X1ATCTX2TX3-3' (wherein X1, X2, and X3 are independently selected from A, C, T, or G). In some embodiments, the stop signal has one of the following nucleotide sequences: TATCTGTT; and / or TTTTTT; and / or AAGCTT; and / or GAAGAGC; and / or TCTAGA. In an exemplary embodiment, the stop signal has the following nucleotide sequence: 5'-X1AUCUX2UX3-3' (wherein X1, X2, and X3 are independently selected from A, C, U, or G). In specific embodiments, the termination signal has one of the following nucleotide sequences: UAUCUGUU; and / or UUUUUU; and / or AAGCUU; and / or GAAGAGC; and / or UCUAGA.

[0145] Guanine-cytosine (GC) content The method further includes determining the guanine-cytosine (GC) content of each optimized nucleotide sequence in the updated list of optimized nucleotide sequences. The GC content of a sequence is the percentage of bases in a nucleotide sequence that are guanine or cytosine. The list of optimized nucleotide sequences is further updated by removing any nucleotide sequence from the list if its GC content is outside a predetermined GC content range.

[0146] Determining the GC content of each of the optimized nucleotide sequences includes, for each nucleotide sequence, determining the GC content of one or more additional portions of the nucleotide sequence, where the additional portions do not overlap with each other or the first portion; and updating the list of optimized sequences includes removing a nucleotide sequence if the GC content of any portion falls outside a predetermined GC content range; optionally, determining the GC content of the nucleotide sequence is stopped when the GC content of any portion is determined to be outside the predetermined GC content range. In some embodiments, the first portion and / or one or more additional portions of the nucleotide sequence comprise a predetermined number of nucleotides, optionally, the predetermined number of nucleotides is in the range of 5 to 300 nucleotides, or 10 to 200 nucleotides, or 15 to 100 nucleotides, or 20 to 50 nucleotides. In the context of the present invention, the predetermined number of nucleotides is typically 30 nucleotides. The predetermined GC content range may be 15% to 75%, or 40% to 60%, or 30% to 70%. In the context of the present invention, the predetermined GC content range is typically 30% to 70%.

[0147] A public GC content filter associated with the present invention may first analyze the first 30 nucleotides of an optimized nucleotide sequence, i.e., nucleotides 1 to 30 of the optimized nucleotide sequence. The analysis may include determining the number of nucleotides in the portion that are either G or C, and determining the GC content of the portion may include dividing the number of G or C nucleotides in the portion by the total number of nucleotides in the portion. The result of this analysis provides a value representing the proportion of nucleotides in the portion that are G or C, which may be a percentage, e.g., 50%, or a fraction, e.g., 0.5. If the GC content of the first portion is outside a predetermined GC content range, the optimized nucleotide sequence may be removed from the list of optimized nucleotide sequences.

[0148] If the GC content of the first portion is within a predetermined GC content range, the GC content filter may then analyze a second portion of the optimized nucleotide sequence. In this example, this may be the second 30 nucleotides of the optimized nucleotide sequence, i.e., 31 to 60 nucleotides. The portion analysis may be repeated for each portion until either: if a portion is found that has a GC content that is outside the predetermined GC content range, the optimized nucleotide sequence may be removed from the list; or, if the entire optimized nucleotide sequence has been analyzed and no such portion is found, the GC content filter may leave the optimized nucleotide sequence on the list and move on to the next optimized nucleotide sequence in the list.

[0149] Codon Adaptation Index (CAI) The method further includes determining a codon adaptation index (CAI) for each optimized nucleotide sequence in the latest updated list of optimized nucleotide sequences. The CAI of a sequence is a measure of codon usage bias and can be a value between 0 and 1. The latest updated list of optimized nucleotide sequences is further updated by removing any nucleotide sequences whose CAI is equal to or less than a predetermined codon adaptation index threshold. The CAI threshold can be 0.7, 0.75, 0.8, 0.85, or 0.9. The inventors have found that optimized nucleotide sequences with a CAI of 0.8 or greater result in very high protein yields. Therefore, in the context of the present invention, the CAI threshold is typically 0.8.

[0150] The codon adaptation index (CAI) can be calculated for each optimized nucleotide sequence in any way that would be apparent to one skilled in the art, for example, as described in "The codon adaptation index—a measure of directional synonymous codon usage bias, and its potential applications" (Sharp and Li, 1987. Nucleic Acids Research 15(3), p. 1281-1295) (available online at https: / / www.ncbi.nlm.nih.gov / pmc / articles / PMC340524 / ).

[0151] Implementing a Codon Adaptation Index (CAI) calculation may involve methods similar to the following: For each amino acid in a sequence, the weight of each codon in the sequence is calculated as a function of its relative adaptability (w i The relative fitness can be expressed by a parameter called the codon f i the observed frequency of and the most frequent synonymous codon for that amino acid, f j The CAI of a sequence can then be calculated as the geometric mean of the weights associated with each codon across the length of the sequence (measured in codons). The reference sequence set used to calculate the CAI can be the same reference sequence set from which the codon usage table used in the method of the present invention is derived.

[0152] In vitro transcription The mRNA of the present invention can be synthesized according to any of a variety of known methods. Various methods are described in published U.S. Patent Application Publication No. 2018 / 0258423 and International Publication No. WO 2018 / 157153 (incorporated herein by reference) and can be used to practice the present invention. For example, the mRNA of the present invention can be synthesized by in vitro transcription (IVT). Briefly, IVT is typically performed on a linear or circular DNA template or DNA vector containing a promoter, a pool of ribonucleotide triphosphates, a buffer system that may contain DTT and magnesium ions, and an appropriate RNA polymerase (e.g., T3, T7, or SP6 RNA polymerase), DNase I, pyrophosphatase, and / or RNase inhibitor. The exact conditions will vary depending on the specific application.

[0153] For the preparation of mRNA by IVT, a DNA template or DNA vector can be transcribed in vitro. The DNA template or DNA vector typically contains a promoter for in vitro transcription (IVT), such as a T3, T7, or SP6 promoter, followed by the desired nucleotide sequence for the desired mRNA and a termination signal (terminator).

[0154] In one aspect, the present invention provides a DNA vector encoding an mRNA comprising an optimized nucleotide sequence described herein. In some embodiments, the DNA vector further comprises a promoter and / or a terminator. In one embodiment, the promoter is an SP6 RNA polymerase promoter. In another embodiment, the promoter is a T7 RNA polymerase promoter.

[0155] Post-synthesis purification Various methods can be used to purify mRNA after synthesis. In some embodiments, mRNA is purified using tangential flow filtration (TFF). Suitable purification methods include those described in U.S. Patent Application Publication Nos. 2016 / 0040154, 2015 / 0376220, 2018 / 0251755, 2018 / 0251754, U.S. Provisional Patent Application No. 62 / 757,612, filed November 8, 2018, and U.S. Provisional Patent Application No. 62 / 891,781, filed August 26, 2019, all of which are incorporated herein by reference and may be used to practice the present invention. Because the purity requirements for mRNA products are more stringent for therapeutic use, it is advantageous to purify the mRNA of the present invention, which may be included in a pharmaceutical composition in some embodiments of the present invention.

[0156] In some embodiments, the mRNA is purified before capping and tailing. In some embodiments, the mRNA is purified after capping and tailing. In some embodiments, the mRNA is purified both before and after capping and tailing. In some embodiments, the mRNA is purified either before, after, or both before and after capping and tailing by centrifugation. In some embodiments, the mRNA is purified either before, after, or both before and after capping and tailing by filtration. In some embodiments, the mRNA is purified either before, after, or both before and after capping and tailing by TFF.

[0157] Lipid nanoparticles (LNPs) The present invention also provides lipid nanoparticles (LNPs) encapsulating one or more mRNAs for use in the present invention. Typically, lipid nanoparticles suitable for use in the present invention comprise one or more cationic lipids, one or more non-cationic lipids (e.g., DOPE and / or cholesterol), and one or more PEG-modified lipids (e.g., DMG-PEG2K).

[0158] Typical lipid nanoparticles for use in the present invention are composed of four lipid components: a cationic lipid (e.g., cKK-E10, OF-02, or ALC-0315), a non-cationic lipid (e.g., DOPE or DSPC), a cholesterol-based lipid (e.g., cholesterol), and a PEG-modified lipid (e.g., DMG-PEG-2K or 2-[(polyethylene glycol)-2000]-N,N-ditetradecylacetamide (ALC-0159)). The molar ratios of cationic lipid to non-cationic lipid to cholesterol to PEG-modified lipid are typically about 30-60:25-35:20-30:1-15, respectively. Exemplary LNPs according to the present invention may be composed of a cationic lipid selected from cKK-E10, OF-02, and ALC-0315; a non-cationic lipid selected from DOPE and DSPC; a cholesterol-based lipid such as cholesterol; and a PEG-modified lipid such as DMG-PEG-2K and ALC-0159.

[0159] In some embodiments, the lipid nanoparticles comprise three or fewer distinct lipid components. Exemplary lipid nanoparticles are composed of three lipid components: a cationic lipid (e.g., a sterol-based cationic lipid), a non-cationic lipid (e.g., DOPE or DEPE), and a PEG-modified lipid (e.g., DMG-PEG2K). In a specific embodiment, the three distinct lipid components are HGT4002, DOPE, and DMG-PEG2K. In an exemplary embodiment, HGT4002, DOPE, and DMG-PEG2K are present in a molar ratio of approximately 60:35:5, respectively. Such LNPs may be particularly suitable for aerosol delivery of mRNA of the present invention.

[0160] Lipid nanoparticles for use in the present invention can be prepared by a variety of techniques currently known in the art, such as those described in published U.S. Patent Application Publication No. 2011 / 0244026, published U.S. Patent Application Publication No. 2016 / 0038432, published U.S. Patent Application Publication No. 2018 / 0153822, published U.S. Patent Application Publication No. 2018 / 0125989, and U.S. Provisional Patent Application No. 62 / 877,597, filed July 23, 2019, all of which are incorporated herein by reference.

[0161] cationic lipids Cationic lipids provide a positively charged environment at low pH, facilitating efficient encapsulation of negatively charged mRNA drug substances. Various cationic lipids suitable for use in LNPs are known in the art. These include, for example, DOTAP (1,2-dioleyl-3-trimethylammonium propane), DODAP (1,2-dioleyl-3-dimethylammonium propane), DOTMA (N-[1-(2,3-dioleyloxy)propyl]-N,N,N-trimethylammonium chloride), DLinKC2DMA, DLin-KC2-DM, and C12-200. Exemplary cationic lipids suitable for use in the LNPs, compositions, pharmaceutical compositions, and methods of the invention are described herein, including, for example, cationic lipids as described in International Patent Publication No. 2010 / 144740, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid having the following compound structure: (6Z,9Z,28Z,31Z)-heptatriaconta-6,9,28,31-tetraen-19-yl 4-(dimethylamino)butanoate: [ka] and pharmaceutically acceptable salts thereof.

[0162] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include ionizable cationic lipids as described in International Patent Publication No. WO 2013 / 149140, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise an ionizable cationic lipid having the following formula: [ka] or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are each independently hydrogen, an optionally substituted, undefined saturated or unsaturated C1-C 20 Alkyl and optionally substituted, unspecified saturated or unsaturated C-C 20 acyl; L1 and L2 are each independently selected from the group consisting of hydrogen, optionally substituted C1-C 30 Alkyl, optionally substituted, unsaturated C1-C 30 Alkenyl and optionally substituted C1-C 30 alkynyl; m and o are each independently selected from the group consisting of zero and any positive integer (e.g., m is 3); and n is zero or any positive integer (e.g., n is 1). In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid (15Z,18Z)-N,N-dimethyl-6-(9Z,12Z)-octadeca-9,12-dien-1-yl)tetracosa-15,18-dien-1-amine ("HGT5000") having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid (15Z,18Z)-N,N-dimethyl-6-((9Z,12Z)-octadeca-9,12-dien-1-yl)tetracosa-4,15,18-trien-1-amine ("HGT5001") having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid having the following compound structure and (15Z,18Z)-N,N-dimethyl-6-((9Z,12Z)-octadeca-9,12-dien-1-yl)tetracosa-5,15,18-trien-1-amine ("HGT5002"): [ka] and pharmaceutically acceptable salts thereof.

[0163] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include those cationic lipids described as amino alcohol lipidoids in International Patent Publication No. 2010 / 053572, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0164] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. WO 2016 / 118725, incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0165] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. WO 2016 / 118724, incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0166] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids having the formula 14,25-ditridecyl 15,18,21,24-tetraaza-octatriacontane, and pharmaceutically acceptable salts thereof.

[0167] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication Nos. WO 2013 / 063468 and WO 2016 / 205691, each of which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise cationic lipids of the following formula: [ka] or a pharmaceutically acceptable salt thereof (wherein, R L Each example of is independently an optionally substituted C-C 40 In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0168] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. WO 2015 / 184256, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise cationic lipids of the following formula: [ka] or a pharmaceutically acceptable salt thereof (wherein each X is independently O or S; each Y is independently O or S; each m is independently 0 to 20; each n is independently 1 to 6; and each RA are independently hydrogen, optionally substituted C1-50 alkyl, optionally substituted C2-50 alkenyl, optionally substituted C2-50 alkynyl, optionally substituted C3-10 carbocyclyl, optionally substituted 3-14 membered heterocyclyl, optionally substituted C6-14 aryl, optionally substituted 5-14 membered heteroaryl, or halogen; and each R B are independently hydrogen, optionally substituted C1-50 alkyl, optionally substituted C2-50 alkenyl, optionally substituted C2-50 alkynyl, optionally substituted C3-10 carbocyclyl, optionally substituted 3-14 membered heterocyclyl, optionally substituted C6-14 aryl, optionally substituted 5-14 membered heteroaryl, or halogen. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid, "Target 23," having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0169] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. 2016 / 004202, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] or a pharmaceutically acceptable salt thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] or a pharmaceutically acceptable salt thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] or a pharmaceutically acceptable salt thereof.

[0170] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. WO 2020 / 097384, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid of the following formula: [ka] or a pharmaceutically acceptable salt thereof (wherein each R 1 and R 2 is independently H or a C1-C6 aliphatic; each m is independently an integer having a value from 1 to 4; each A is independently a covalent bond or arylene; each L 1 are independently an ester, thioester, disulfide, or anhydride group; each L 2 are independently C2 to C 10 is aliphatic; each X 1 is independently H or OH; and each R 3 are independently C6 to C 20 In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid of the following formula: [ka] or a pharmaceutically acceptable salt thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid of the following formula: [ka] or a pharmaceutically acceptable salt thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid of the following formula: [ka] or a pharmaceutically acceptable salt thereof.

[0171] Other suitable cationic lipids for use in the pharmaceutical compositions and methods of the invention include those described in J. McClellan, MCKing, Cell 2010, 141, 210-217 and Whitehead et al., Nature Communications (2014) 5:4277, which are incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0172] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. 2015 / 199952, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0173] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. 2017 / 004143, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0174] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. WO 2017 / 075531, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise cationic lipids of the following formula: [ka] or a pharmaceutically acceptable salt thereof (wherein, L 1 or L 2 One of the following is -O(C=O)-, -(C=O)O-, -C(=O)-, -O-, -S(O) x , -SS-, -C(=O)S-, -SC(=O)-, -NR a C(=O)-, -C(=O)NR a -, NR a C(=O)NR a -, -OC(=O)NR a - or -NR a C(=O)O-;L 1 or L 2 Others of the above are -O(C=O)-, -(C=O)O-, -C(=O)-, -O-, -S(O) x , -SS-, -C(=O)S-, SC(=O)-, -NR a C(=O)-, -C(=O)NR a -, NR a C(=O)NR a -, -OC(=O)NR a -or-NR a C(=O)O- or a direct bond; G 1 and G 2 are each independently unsubstituted C1 to C12 Alkylene or C1-C 12 Alkenylene; G 3 is C1~C 24 Alkylene, C1-C 24 alkenylene, C3-C8 cycloalkylene, C3-C8 cycloalkenylene; R a is H or C1~C 12 alkyl; R 1 and R 2 are each independently C6 to C 24 Alkyl or C6-C 24 alkenyl; R 3 H, OR 5 , CN, -C(=O)OR 4 , -OC(=O)R 4 or -NR 5 C(=O)R 4 and;R 4 is C1~C 12 alkyl; R 5 is H or C1-C6 alkyl; and x is 0, 1, or 2).

[0175] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. WO 2017 / 117528, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0176] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication No. 2017 / 049245, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a compound of one of the following formulas: [ka] and pharmaceutically acceptable salts thereof. For any one of these four formulas, R4 is independently -(CH2) n Q and -(CH2) n Q is selected from -OR, -OH, -O(CH2) n and n is 1, 2, or 3. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0177] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in International Patent Publication Nos. WO 2017 / 173054 and WO 2015 / 095340, each of which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0178] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in U.S. Provisional Patent Application No. 63 / 082,090, filed September 23, 2020, which is incorporated herein by reference. In some embodiments, the compositions and methods of the invention comprise cationic lipids having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0179] In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise: [ka] and pharmaceutically acceptable salts thereof.

[0180] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in U.S. Provisional Patent Application No. 63 / 003,698, filed April 1, 2020, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0181] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in U.S. Provisional Patent Application No. 63 / 082,101, filed September 23, 2020, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0182] In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0183] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cationic lipids as described in U.S. Provisional Patent Application No. 62 / 864,818, filed June 21, 2019, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise cationic lipids having a compound structure according to the following formula: [ka] or a pharmaceutically acceptable salt thereof (wherein, R 2 , R 3、 and R 4 Each of these is independently C6 to C 30 Alkyl, C6-C 30 Alkenyl, or C6-C 30 alkynyl; L 1 is C1~C 30 Alkylene, C2-C 30 Alkenylene or C2-C 30 alkynylene; and B 1is an ionizable nitrogen-containing group. 1 is C1~C 10 In embodiments, L is alkylene. 1 is unsubstituted C1 to C 10 In embodiments, L is alkylene. 1 are (CH2)2, (CH2)3, (CH2) 4、 or (CH2)5. In embodiments, L 1 is (CH2), (CH2)6, (CH2)7, (CH2)8, (CH2)9, or (CH2) 10 In an embodiment, B 1 is independently NH, guanidine, amidine, mono- or dialkylamine, 5- to 6-membered nitrogen-containing heterocycloalkyl, or 5- to 6-membered nitrogen-containing heteroaryl. 1 teeth [ka] In an embodiment, B 1 teeth [ka] In an embodiment, B 1 teeth [ka] In an embodiment, R 2 , R 3 , and R 4 each independently is an unsubstituted straight chain C-C 22 Alkyl, unsubstituted straight chain C6-C 22 Alkenyl, unsubstituted straight chain C6-C 22 Alkynyl, unsubstituted branched C6-C 22 Alkyl, unsubstituted branched C6-C 22 Alkenyl or unsubstituted branched C6-C 22 In embodiments, R is alkynyl. 2 , R 3 , and R 4 Each of 22 In embodiments, R 2 , R3 , and R 4 Each of the is -CH 13 , -CH 15 , -CH 17 , -CH 19 , -C 10 H 21 , -C 11 H 23 , -C 12 H 25 , -C 13 H 27 , -C 14 H 29 , -C 15 H 31 , -C 16 H 33 , -C 17 H 35 , -C 18 H 37 , -C 19 H39, -C 20 H 41 , -C 21 H 43 , -C 22 H 45 , -C 23 H 47 , -C 24 H 49 , or -C 25 H 51 In an embodiment, R 2 , R 3 , and R 4 each independently represents -O(CO)R 5 or -C(O)OR 5 C6~C substituted with 12 alkyl (wherein R 5 is unsubstituted C6-C 14 In embodiments, R 2 , R 3 , and R 4 Each of 22 In embodiments, R is an alkenyl. 2 , R 3 , and R 4 are -(CH2)4CH=CH2, -(CH2)5CH=CH2, -(CH2)6CH=CH2, -(CH2)7CH=CH2, -(CH2)8CH=CH2, -(CH2)9CH=CH2, -(CH2)10 CH=CH2, -(CH2) 11 CH=CH2, -(CH2) 12 CH=CH2, -(CH2) 13 CH=CH2, -(CH2) 14 CH=CH2, -(CH2) 15 CH=CH2, -(CH2) 16 CH=CH2, -(CH2) 17 CH=CH2, -(CH2) 18 CH=CH2, -(CH2)7CH=CH(CH2)3CH3, -(CH2)7CH=CH(CH2)5CH3, -(CH2)4CH=CH(CH2)8CH3, -(CH2)7CH=CH(CH2)7CH3, -(CH2)6CH=CHCH2CH=CH(CH2)4CH3, -(CH2)7CH=CHCH2CH=CH( CH2)4CH3, -(CH2)7CH=CHCH2CH=CHCH2CH=CHCH2CH3, -(CH2)3CH=CHCH2CH=CHCH2CH=CHCH2CH=CH(CH2)4CH3, -(CH2)3CH=CHCH2CH=CHCH2CH=CHCH2CH=CHCH2CH=CHCH2CH3, -(CH2) 11 CH=CH(CH2)7CH3, or -(CH2)2CH=CHCH2CH=CHCH2CH=CHCH2CH=CHCH2CH=CHCH2CH=CHCH2CH=CHCH2CH3. In an embodiment, the C6 to C 22 Alkenyl is monoalkenyl, dienyl, or trienyl. In embodiments, R 2 , R 3 , and R 4 Each of the [ka] In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0184] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions and methods of the invention include cleavable cationic lipids as described in International Patent Publication No. WO 2012 / 170889, which is incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid of the following formula: [ka] wherein R1 is selected from the group consisting of imidazole, guanidinium, amino, imine, enamine, optionally substituted alkylamino (e.g., alkylamino such as dimethylamino), and pyridyl; and R2 is selected from the group consisting of the following two formulae: [ka] wherein R3 and R4 are each independently selected from the group consisting of any optionally substituted saturated or unsaturated C6-C 20 Alkyl and optionally substituted, unspecified saturated or unsaturated C-C 20and n is 0 or any positive integer (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or more). In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid, "HGT4001," having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid, "HGT4002," having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid, "HGT4003," having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid, "HGT4004," having the following compound structure: [ka] and pharmaceutically acceptable salts thereof. In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid, "HGT4005," having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0185] Other suitable cationic lipids for use in the LNPs, compositions, pharmaceutical compositions, and methods of the invention include cleavable cationic lipids as described in International Patent Publication No. WO 2019 / 222424, incorporated herein by reference. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid having any of the general formulas or structures (1a)-(21a), (1b)-(21b), and (22)-(237) described in International Patent Publication No. WO 2019 / 222424. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid having a structure according to Formula (I'): [ka] During the ceremony, R X are independently -H, -L 1 -R 1 , or -L 5A -L 5B -B'; L 1 , L 2 , and L 3 each independently represents a covalent bond, —C(O)—, —C(O)O—, —C(O)S—, or —C(O)NR L - and; Each L 4A and L 5A are independently —C(O)—, —C(O)O—, or —C(O)NR L - and; Each L 4B and L 5B are independently C1 to C 20 Alkylene, C2-C 20 Alkenylene or C2-C 20 is alkynylene; Each B and B' is NR 4 R 5 or a 5- to 10-membered nitrogen-containing heteroaryl; Each R 1 , R 2 and R 3 are independently C6 to C 30 Alkyl, C6-C30 Alkenyl, or C6-C 30 is alkynyl; Each R 4 and R 5 are independently hydrogen, C1 to C 10 Alkyl, C2-C 10 Alkenyl, or C2-C 10 alkynyl; and Each R L are independently hydrogen, C1 to C 20 Alkyl, C2-C 20 Alkenyl, or C2-C 20 It is alkynyl. In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise a cationic lipid that is compound (139) of International Patent Publication No. WO 2019 / 222424, having the following compound structure: [ka] .

[0186] In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid that is RL3-DMA-07D, having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0187] In some embodiments, the LNPs, compositions, pharmaceutical compositions and methods of the invention comprise a cationic lipid that is RL2-DMP-07D, having the following compound structure: [ka] and pharmaceutically acceptable salts thereof.

[0188] In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise the cationic lipid GL-HEPES-E3-E10-DS-3-E18-1(2-(4-(2-((3-(bis((Z)-2-hydroxyoctadec-9-en-1-yl)amino)propyl)disulfaneyl)ethyl)piperazin-1-yl)ethyl 4-(bis(2-hydroxydecyl)amino)butanoate), having the following compound structure: [ka]

[0189] In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise the cationic lipid GL-HEPES-E3-E12-DS-4-E10 (2-(4-(2-((3-(bis(2-hydroxydecyl)amino)butyl)disulfanayl)ethyl)piperazin-1-yl)ethyl 4-(bis(2-hydroxydodecyl)amino)butanoate), having the following compound structure: [ka]

[0190] In some embodiments, the LNPs, compositions, pharmaceutical compositions, and methods of the invention comprise the cationic lipid GL-HEPES-E3-E12-DS-3-E14 (2-(4-(2-((3-(bis(2-hydroxytetradecyl)amino)propyl)disulfanayl)ethyl)piperazin-1-yl)ethyl 4-(bis(2-hydroxydodecyl)amino)butanoate), having the following compound structure: [ka]

[0191] In some embodiments, the LNPs comprise the cationic lipid, N-[l-(2,3-dioleyloxy)propyl]-N,N,N-trimethylammonium chloride (“DOTMA”) (Feigner et al. (Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355), which are incorporated herein by reference. Other cationic lipids suitable for the LNPs, compositions, pharmaceutical compositions, and methods of the invention include, for example, 5-carboxyspermylglycine dioctadecylamide (“DOGS”); 2,3-dioleyloxy-N-[2(spermine-carboxamido)ethyl]-N,N-dimethyl-l-propanaminium (“DOSPA”) (Behr et al. Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355), which are incorporated herein by reference. Acad. Sci. 86, 6982 (1989), U.S. Pat. No. 5,171,678; U.S. Pat. No. 5,334,761); 1,2-dioleoyl-3-dimethylammonium-propane ("DODAP"); 1,2-dioleoyl-3-trimethylammonium-propane ("DOTAP").

[0192] In some embodiments, the LNP comprises a cationic lipid IM-001 having the following structure: [ka]

[0193] In some embodiments, the LNPs comprise the cationic lipid, N-[l-(2,3-dioleyloxy)propyl]-N,N,N-trimethylammonium chloride (“DOTMA”) (Feigner et al. (Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355), which are incorporated herein by reference. Other cationic lipids suitable for the LNPs, compositions, pharmaceutical compositions, and methods of the invention include, for example, 5-carboxyspermylglycine dioctadecylamide (“DOGS”); 2,3-dioleyloxy-N-[2(spermine-carboxamido)ethyl]-N,N-dimethyl-l-propanaminium (“DOSPA”) (Behr et al. Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355), which are incorporated herein by reference. Acad. Sci. 86, 6982 (1989), U.S. Pat. No. 5,171,678; U.S. Pat. No. 5,334,761); 1,2-dioleoyl-3-dimethylammonium-propane ("DODAP"); 1,2-dioleoyl-3-trimethylammonium-propane ("DOTAP").

[0194] N-[1-(2,3-dioleyloxy)propyl]-N,N,N-trimethylammonium chloride (“DOTMA”) (Feigner et al. (Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355), which are incorporated herein by reference. Other cationic lipids suitable for the LNPs, compositions, pharmaceutical compositions and methods of the invention include, for example, 5-carboxyspermylglycine dioctadecylamide (“DOGS”); 2,3-dioleyloxy-N-[2(spermine-carboxamido)ethyl]-N,N-dimethyl-1-propanaminium (“DOSPA”) (Behr et al. Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355), which are incorporated herein by reference. Acad. Sci. 86, 6982 (1989), U.S. Pat. No. 5,171,678; U.S. Pat. No. 5,334,761); 1,2-dioleoyl-3-dimethylammonium-propane ("DODAP"); 1,2-dioleoyl-3-trimethylammonium-propane ("DOTAP").

[0195] Additional exemplary cationic lipids suitable for the LNPs, compositions, pharmaceutical compositions, and methods of the invention also include 1,2-distearyloxy-N,N-dimethyl-3-aminopropane ("DSDMA"), 1,2-dioleyloxy-N,N-dimethyl-3-aminopropane ("DODMA"); 1,2-dilinoleyloxy-N,N-dimethyl-3-aminopropane ("DLinDMA"); 1,2-dilinolenyloxy-N,N-dimethyl-3-aminopropane ("DLenDMA"); N-dioleyl-N,N-dimethyl-3-aminopropane ("DLenDMA"); N,N-dimyristyl ammonium chloride ("DODAC"); N,N-distearyl-N,N-dimethyl ammonium bromide ("DDAB"); N-(1,2-dimyristyloxyprop-3-yl)-N,N-dimethyl-N-hydroxyethyl ammonium bromide ("DMRIE"); 3-dimethylamino-2-(cholest-5-ene-3-beta-oxybutan-4-oxy)-l-(cis,cis-9,12-octadecadienooxy)propane ("CLinDMA"); 2-[5'-(cholest-5-ene-3- beta-oxy)-3'-oxapentoxy)-3-dimethyl-l-(cis,cis-9',l-2'-octadecadienooxy)propane ("CpLinDMA"); N,N-dimethyl-3,4-dioleyloxybenzylamine ("DMOBA"); 1,2-N,N'-dioleylcarbamyl-3-dimethylaminopropane ("DOcarbDAP"); 2,3-dilinoleoyloxy-N,N-dimethylpropylamine ("DLinDAP"); 1,2-N,N'-dilinoleylcarbamyl-3-dimethylaminopropane 1,2-Dilinoleoylcarbamyl-3-dimethylaminopropane ("DLinCDAP"); 2,2-Dilinoleyl-4-dimethylaminomethyl-[1,3]-dioxolane ("DLin-K-DMA"); 2-((8-[(3P)-cholest-5-en-3-yloxy]octyl)oxy)-N,N-dimethyl-3-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]propan-1-amine ("Octyl-CLinDMA");(2R)-2-((8-[(3beta)-cholest-5-en-3-yloxy]octyl)oxy)-N,N-dimethyl-3-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]propan-1-amine ("Octyl-CLinDMA(2R)"); (2S)-2-((8-[(3P)-cholest-5-en-3-yloxy]octyl)oxy)-N,fsl-dimethyh3-[(9Z,12Z)-octadeca-9,12-dien-1-yloxy]propan-1-amine (" octyl-CLinDMA(2S)"); 2,2-dilinoleyl-4-dimethylaminoethyl-[1,3]-dioxolane ("DLin-K-XTC2-DMA"); and 2-(2,2-di((9Z,12Z)-octadeca-9,12-dien-1-yl)-1,3-dioxolan-4-yl)-N,N-dimethylethanamine ("DLin-KC2-DMA") (see WO 2010 / 042877; See also, Nature Biotech. 28:172-176 (2010), which is incorporated herein by reference). (Heyes, J., et al., J Controlled Release 107:276-287 (2005); Morrissey, DV., et al., Nat. Biotechnol. 23(8):1003-1007 (2005); International Patent Publication No. 2005 / 121348). In some embodiments, one or more of the cationic lipids comprises at least one of an imidazole, dialkylamino, or guanidinium moiety. In some embodiments, the one or more cationic lipids suitable for the LNPs, compositions, pharmaceutical compositions, and methods of the invention include 2,2-dilinoleyl-4-dimethylaminoethyl-[1,3]-dioxolane ("XTC"); (3aR,5s,6aS)-N,N-dimethyl-2,2-di((9Z,12Z)-octadeca-9,12-dienyl)tetrahydro-3aH-cyclopenta[d][1,3]dioxol-5-amine ("ALNY-100") and / or 4,7,13-tris(3-oxo-3-(undecylamino)propyl)-N1,N16-diundecyl-4,7,10,13-tetraazahexadecane-1,16-diamide ("NC98-5");

[0196] In certain embodiments, the cationic lipid is cKK-E12, cKK-E10, HGT5000, HGT5001, ICE, HGT4001, HGT4002, HGT4003, TL1-01D-DMA, TL1-04D-DMA, TL1-08D-DMA, TL1-10D-DMA, OF-Deg-Lin, OF-02, GL-TES-SA-DMP-E18-2, GL-TES-SA-DME-E18-2, SY-3-E14-DMAPr, TL1-10D-DMA, HEP-E 3-E10, HEP-E4-E10, RL3-DMA-07D, RL2-DMP-07D, cHse-E-3-E10, cHse-E-3-E12, cDD-TE-4-E12, SI-4-E14-DMAPr, TL-1-12D-DMA, SY-010, SY-011, GL-HEPES-E3-E12-DS-4-E10, and 4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate (ALC-0315).

[0197] In specific embodiments, the cationic lipid is selected from cKKE10, OF-02, GL-HEPES-E3-E12-DS-4-E10, and ALC-0315.

[0198] In some embodiments, the LNPs, compositions, and pharmaceutical compositions of the present invention comprise one or more cationic lipids that account for at least about 5%, 10%, 20%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70% of the total lipid content in the LNPs, compositions, and pharmaceutical compositions, e.g., as measured by weight of the lipid nanoparticles. In some embodiments, the LNPs, compositions, and pharmaceutical compositions of the present invention comprise one or more cationic lipids that account for at least about 5%, 10%, 20%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70% of the total lipid content in the LNPs, compositions, and pharmaceutical compositions, e.g., as measured as mol% of the lipid nanoparticles. In some embodiments, the LNPs, compositions, and pharmaceutical compositions of the present invention comprise one or more cationic lipids that account for about 30-70% (e.g., about 30-65%, about 30-60%, about 30-55%, about 30-50%, about 30-45%, about 30-40%, about 35-50%, about 35-45%, or about 35-40%) of the total lipid content in the LNPs, compositions, or pharmaceutical compositions, e.g., as measured by weight of the lipid nanoparticles. In some embodiments, the LNPs, compositions, and pharmaceutical compositions of the present invention comprise one or more cationic lipids that account for about 30-70% (e.g., about 30-65%, about 30-60%, about 30-55%, about 30-50%, about 30-45%, about 30-40%, about 35-50%, about 35-45%, or about 35-40%) of the total lipid content in the LNPs, compositions, or pharmaceutical compositions, e.g., measured as mol% of the lipid nanoparticles.

[0199] Non-cationic lipids In some embodiments, the lipid nanoparticles contain one or more non-cationic lipids. As used herein, the phrase "non-cationic lipid" refers to any neutral, zwitterionic, or anionic lipid. As used herein, the phrase "anionic lipid" refers to any of several lipid species that have a net negative charge at a selected pH, such as physiological pH. The non-cationic nature may enhance the structural stability of the LNP and improve the uptake and release of the mRNA payload. In some embodiments, the non-cationic lipid is a zwitterionic lipid that has fusogenic properties to enhance the uptake and release of the mRNA payload. Non-cationic lipids include distearoylphosphatidylcholine (DSPC), dioleoylphosphatidylcholine (DOPC), dipalmitoylphosphatidylcholine (DPPC), 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), dioleoylphosphatidylglycerol (DOPG), dipalmitoylphosphatidylglycerol (DPPG), dioleoylphosphatidylethanolamine (DOPE), 1,2-dioleoyl-sn-glycero-3-phospho-L-serine (DOPS), palmitoyloleoylphosphatidylcholine (POPC), palmitoyloleoyl-phosphatidylethanolamine (POPE), and dioleoyl-phosphatidylethanolamine 4-(N-maleimidomethyl)-cyclohexane-l-carboxylate. silyl phosphate (DOPE-mal), dipalmitoylphosphatidylethanolamine (DPPE), dimyristoylphosphoethanolamine (DMPE), distearoyl-phosphatidyl-ethanolamine (DSPE), 1,2-dilauroyl-sn-glycero-3-phosphoethanolamine (DLPE), 1,2-dierucoyl-sn-glycero-3-phosphoethanolamine (DEPE), 1,2-dioleoyl-sn-glycero-3-phosphocholine (DPOC), phosphatidylserine, sphingolipids, cerebrosides, gangliosides, 16-O-monomethyl PE, 16-O-dimethyl PE, 18-1-trans PE, 1-stearoyl-2-oleoyl-phosphatidylethanolamine (SOPE), or mixtures thereof.In some embodiments, lipid nanoparticles suitable for use in the present invention comprise DOPE as a non-cationic lipid component. In other embodiments, lipid nanoparticles suitable for use in the present invention comprise DEPE as a non-cationic lipid component.

[0200] In certain embodiments, the non-cationic lipid is selected from DSPC (1,2-distearoyl-sn-glycero-3-phosphocholine), DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine), DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine), DEPE 1,2-dierucoyl-sn-glycero-3-phosphoethanolamine, DOPC (1,2-dioleoyl-sn-glycero-3-phosphotidylcholine), DPPE (1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine), DMPE (1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine), and DOPG (1,2-dioleoyl-sn-glycero-3-phospho-(1'-rac-glycerol)). In specific embodiments, the non-cationic lipid is selected from DOPE and / or DSPC.

[0201] In some embodiments, the non-cationic lipid is a neutral lipid, i.e., a lipid that has no net charge under the conditions in which the LNP, composition, pharmaceutical composition is formulated and / or administered.

[0202] Cholesterol-based lipids In some embodiments, the lipid nanoparticles comprise one or more cholesterol-based lipids.Cholesterol-based lipids can provide stability to the lipid bilayer structure within the nanoparticles.For example, suitable cholesterol-based cationic lipids include DC-Chol (N,N-dimethyl-N-ethylcarboxamidocholesterol), l,4-bis(3-N-oleylamino-propyl)piperazine (Gao, et al. Biochem.Biophys.Res.Comm.179,280(1991); Wolf et al. BioTechniques 23,139(1997); U.S. Pat. No. 5,744,335), or imidazole cholesterol ester (ICE) as disclosed in International Patent Publication No. 2011 / 068810, having the following structure: [ka] .

[0203] In embodiments, the cholesterol-based lipid is cholesterol.

[0204] PEG modified lipid In some embodiments, the lipid nanoparticles comprise one or more PEGylated lipids. PEGylated lipids can provide control over the particle size and stability of LNPs. The addition of such components can prevent complex aggregation, extend circulation life, and provide a means for increasing the delivery of lipid-nucleic acid pharmaceutical compositions to target tissues (Klibanov et al., FEBS Letters (1990) 268 (1): 235-7). These components can be selected to be rapidly exchanged from the pharmaceutical composition in vivo (see, for example, U.S. Patent No. 5,885,613).

[0205] The use of derivatized lipids, such as polyethylene glycol (PEG)-modified phospholipids and derivatized ceramides including N-octanoyl-sphingosine-1-[succinyl(methoxypolyethylene glycol)-2000] (C8 PEG-2000 ceramide) (PEG-CER), alone or preferably in combination with other lipid pharmaceutical compositions, including delivery vehicles (e.g., lipid nanoparticles), is also contemplated by the present invention.

[0206] Contemplated PEG-modified lipids include C6-C 20 (e.g., C8, C 10 , C 12 , C 14 , C 16 , or C 18 Examples of suitable PEG-modified or PEGylated lipids include, but are not limited to, polyethylene glycol chains up to 5 kDa in length covalently attached to lipids having alkyl chains of up to 5 kDa in length. In some embodiments, the PEG-modified or PEGylated lipid is PEGylated cholesterol or PEG-2K. The addition of such components may prevent complex aggregation and may also provide a means for increasing the circulatory life and delivery of lipid-nucleic acid pharmaceutical compositions to target tissues (Klibanov et al. (1990) FEBS Letters, 268(1):235-237), or they may be selected to be rapidly exchanged from the pharmaceutical composition in vivo (see U.S. Pat. No. 5,885,613). Particularly useful exchangeable lipids are those with shorter acyl chains (e.g., C 14 or C 18 ) is a PEG-ceramide.

[0207] In some embodiments, the PEGylated lipid is 1,2-dimyristoyl-rac-glycero-3-methoxypolyethylene glycol (DMG-PEG); 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-polyethylene glycol (DSPE-PEG); 1,2-dilauroyl-sn-glycero-3-phosphoethanolamine-polyethylene glycol (DLPE-PEG); or 1,2-distearoyl-rac-glycero-polyethylene glycol (DSG-PEG).

[0208] PEG typically has a high molecular weight, e.g., 2000-2400 g / mol. In some embodiments, the PEG is PEG2000 (or PEG-2K). In certain embodiments, the PEGylated lipid is DMG-PEG2000, DSPE-PEG2000, DLPE-PEG2000, DSG-PEG2000, or C8 PEG2000.

[0209] LNPs suitable for use in the present invention typically include PEG-modified lipids such as 1,2-dimyristoyl-rac-glycero-3-methoxypolyethylene glycol-2000 (DMG-PEG2K) or 2-[(polyethylene glycol)-2000]-N,N-ditetradecylacetamide (ALC-0159).

[0210] In some embodiments, one or more PEG-modified lipids account for about 4% of total lipids by molar ratio. In some embodiments, one or more PEG-modified lipids account for about 5% of total lipids by molar ratio. In some embodiments, one or more PEG-modified lipids account for about 6% of total lipids by molar ratio. For certain applications, such as pulmonary delivery, lipid nanoparticles in which PEG-modified lipid components account for about 5% of total lipids by molar ratio have been found to be particularly suitable.

[0211] Exemplary Lipid Formulations Exemplary LNPs for use in the present invention include the following combinations: cationic lipid, non-cationic lipid, PEG-modified lipid, and optionally cholesterol: cKK-E12, DOPE, cholesterol, and DMG-PEG2K; cKK-E10, DOPE, cholesterol, and DMG-PEG2K; OF-Deg-Lin, DOPE, cholesterol, and DMG-PEG2K; OF-02, DOPE, cholesterol, and DMG-PEG2K; GL-HEPES-E3-E12-DS-4-E10, DOPE, cholesterol, and DMG-PEG2K; C12-200, DOPE, cholesterol, and DMG-PEG2K; HGT4003, DOPE, cholesterol, and DMG-PEG2K; ICE, DOPE, cholesterol, and DMG-PEG2K; HGT4001, DOPE, cholesterol, and DMG-PEG2K; HGT4002, DOPE, cholesterol, and DMG-PEG2K; TL1-01D-DMA, DOPE, cholesterol, D-DMA, DOPE, cholesterol, and DMG-PEG2K; TL1-04 D-DMA, DOPE, cholesterol, and DMG-PEG2K; TL1-08 D-DMA, DOPE, cholesterol, and DMG-PEG2K; TL1-10 D-DMA, DOPE, cholesterol, and DMG-PEG2K; ICE, DOPE, and DMG-PEG2K; HGT4001, DOPE, and DMG-PEG2K; HGT4002, DOPE, and DMG-PEG2K; SY-3-E14-DMAPr, DOPE, cholesterol LNPs may be composed of one of: RL3-DMA-07D, DOPE, cholesterol, and DMG-PEG2K; RL2-DMP-07D, DOPE, cholesterol, and DMG-PEG2K; cHse-E-3-E10, DOPE, cholesterol, and DMG-PEG2K; cHse-E-3-E12, DOPE, cholesterol, and DMG-PEG2K; or cDD-TE-4-E12, DOPE, cholesterol, and DMG-PEG2K. In specific embodiments, the LNPs may be selected from SY-3-E14-DMAPr, DOPE, cholesterol, and DMG-PEG2K. In other specific embodiments, the LNPs may be composed of RL3-DMA-07D, DOPE, cholesterol, and DMG-PEG2K.In yet other specific embodiments, the LNPs may be composed of RL2-DMP-07D, DOPE, cholesterol, and DMG-PEG2K. In yet other specific embodiments, the LNPs may be composed of cHse-E-3-E10, DOPE, cholesterol, and DMG-PEG2K. In yet other specific embodiments, the LNPs may be composed of cHse-E-3-E12, DOPE, cholesterol, and DMG-PEG2K. In yet other specific embodiments, the LNPs may be composed of cDD-TE-4-E12, DOPE, cholesterol, and DMG-PEG2K.

[0212] The molar ratio of cationic lipid, PEGylated lipid, cholesterol-based lipid, and non-cationic lipid is A:B:C:D (where A + B + C + D = 100%). In some embodiments, the molar ratio of cationic lipid to total lipid in the LNP (i.e., A) is 35-45% (e.g., 38-42%, e.g., 40%). In some embodiments, the molar ratio of PEGylated lipid component to total lipid (i.e., B) is 0.25-2.75% (e.g., 1-2%, e.g., 1.5%). In some embodiments, the molar ratio of cholesterol-based lipid to total lipid (i.e., C) is 20-35% (e.g., 27-30%, e.g., 28.5%). In some embodiments, the molar ratio of non-cationic lipid to total lipid (i.e., D) is 25-35% (e.g., 28-32%, e.g., 30%). In some embodiments, the (PEGylated lipid + cholesterol) components have the same molar amount as the helper lipid. In some embodiments, the LNPs contain a molar ratio of cationic lipid to helper lipid that is greater than one.

[0213] In some embodiments, the cationic lipid (e.g., cKK-E12, cKK-E10, OF-Deg-Lin, OF-02, GL-HEPES-E3-E12-DS-4-E10, TL1-01D-DMA, TL1-04D-DMA, TL1-08D-DMA, TL1-10D-DMA, ICE, HGT4001, and / or HGT4002) comprises about 30-60% (e.g., about 30-55%, about 30-50%, about 30-45%, about 30-40%, about 35-50%, about 35-45%, or about 35-40%) of the lipid nanoparticle by molar ratio. In some embodiments, the percentage of cationic lipid (e.g., cKK-E12, cKK-E10, OF-Deg-Lin, OF-02, GL-HEPES-E3-E12-DS-4-E10, TL1-01D-DMA, TL1-04D-DMA, TL1-08D-DMA, TL1-10D-DMA, ICE, HGT4001, and / or HGT4002) is greater than about 30%, greater than about 35%, greater than about 40%, greater than about 45%, greater than about 50%, greater than about 55%, or greater than about 60% by molar ratio of the lipid nanoparticles.

[0214] In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids can be about 30-60:25-35:20-30:1-15. In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is approximately 40:30:20:10. In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is approximately 40:30:25:5. In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is approximately 40:32:25:3. In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is approximately 50:25:20:5.

[0215] In certain embodiments, the LNPs comprise a 35% to 55% molar ratio of a cationic lipid (e.g., OF-02, cKK-E10, or GL-HEPES-E3-E12-DS-4-E10); a 5% to 40% molar ratio of a non-cationic lipid (e.g., DOPE); a 20% to 45% molar ratio of a cholesterol-based lipid (e.g., cholesterol); and a 1% to 2% molar ratio of a PEG-modified lipid (e.g., DMG-PEG2K).

[0216] In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is 40:30:28.5:1.5. In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is 46.3:9.4:42.7:1.6. In some embodiments, the molar ratio of cationic lipids to non-cationic lipids to cholesterol-based lipids to PEG-modified lipids is 50:10:38.5:1.5.

[0217] In some embodiments, the LNPs comprise a 40% molar ratio of OF-02, c-KK-E10, or GL-HEPES-E3-E12-DS-4-E10; a 30% molar ratio of DOPE; a 28.5% molar ratio of cholesterol; and a 1.5% molar ratio of DMG-PEG2K. In some embodiments, the LNPs comprise a 46.3% molar ratio of ALC-0315; a 9.4% molar ratio of DSPC; a 42.7% molar ratio of cholesterol; and a 1.6% molar ratio of ALC-0159. In some embodiments, the LNPs comprise a 50% molar ratio of SM-102; a 10% molar ratio of DSPC; a 38.5% molar ratio of cholesterol; and a 1.5% molar ratio of DMG-PEG2K. Such lipid nanoparticles are particularly suitable for intramuscular delivery of mRNA.

[0218] In typical ternary lipid nanoparticles suitable for use in the present invention, the molar ratio of cationic lipid to non-cationic lipid to PEG-modified lipid can be about 55-65:30-40:1-15, respectively. In some embodiments, a molar ratio of 60:35:5 of cationic lipid (e.g., sterol-based lipid), non-cationic lipid (e.g., DOPE or DEPE), and PEG-modified lipid (e.g., DMG-PEG2K) is particularly suitable for pulmonary delivery of lipid nanoparticles, e.g., by nebulization.

[0219] One or more LNPs In some embodiments, LNPs can carry mRNAs encoding multiple proteins, e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or more proteins. For example, LNPs can carry polycistronic mRNAs (e.g., bicistronic mRNAs) that can be translated into multiple influenza virus proteins (e.g., each protein-coding sequence is separated by a nucleotide sequence encoding an IRES or a self-cleaving peptide, such as a 2A peptide). Typically, polycistronic mRNAs encode no more than three or no more than four proteins.

[0220] In some embodiments, one mRNA encodes an HA protein and an NA protein. For example, one or more HA proteins and one or more NA proteins may be encoded by the same mRNA. In a specific embodiment, the mRNA encoding both the HA and NA proteins is separate from the mRNA encoding the M1 protein.

[0221] In some embodiments, one mRNA encodes one or more HA proteins and one or more NA proteins from an influenza A strain. In some embodiments, the encoded HA and NA proteins of influenza A are encoded by the same mRNA. In some embodiments, the mRNA encodes one or more HA proteins and one or more NA proteins from an influenza B strain. In some embodiments, the encoded HA and NA proteins of influenza B are encoded by the same mRNA. In one embodiment, the one or more HA proteins and one or more NA proteins are from a combination of influenza A and influenza B strains and are encoded from the same mRNA.

[0222] In some embodiments, the LNP comprises a first mRNA encoding a first HA protein and a first NA protein, a second mRNA encoding a second HA protein and a second NA protein, and a third mRNA encoding an M1 protein. Typically, the first HA protein and the first NA protein are from a first influenza virus (e.g., H1 and N1 from influenza A), and the second HA protein and the second NA protein are from a second influenza virus (e.g., H3 and N2 from influenza A). In some embodiments, the first and second influenza viruses are influenza A viruses of different subtypes. In some embodiments, the first and second viruses are influenza B viruses of different lineages.

[0223] In some embodiments, the LNP further comprises a fourth mRNA encoding a third HA protein and a third NA protein from a third influenza virus, and a fifth mRNA encoding a fourth HA protein and a fourth NA protein from a fourth influenza virus, wherein the third influenza virus is typically an influenza B virus of the Yamagata lineage of viruses and the fourth influenza virus is from the Victoria lineage.

[0224] In some embodiments, the LNP comprises a first mRNA encoding at least a first HA protein and a second HA protein, a second mRNA encoding at least a first NA protein and a second NA protein, and a third mRNA encoding an M1 protein. Typically, the first HA protein and the second HA protein (and any additional HA proteins) are from different subtypes (e.g., H1 and H3 from influenza A) and / or strains, and the first NA protein and the second NA protein (and any additional NA proteins) are from different subtypes (e.g., N1 and N2 from influenza A) and / or strains.

[0225] In some embodiments, the LNP comprises a fourth mRNA encoding a third HA protein and a third NA protein from a third influenza virus, hi some embodiments, the first influenza virus is an H1N1 influenza A virus, the second influenza virus is an H3N2 influenza virus, and the third influenza virus is an influenza B virus (e.g., influenza B / Yamagata or influenza B / Victoria).

[0226] In some embodiments, the LNP comprises a fifth mRNA encoding a fourth HA protein and a fourth NA protein from a fourth influenza virus, hi some embodiments, the fourth influenza virus is an influenza B virus from a different lineage than the third influenza virus.

[0227] In some embodiments, the first, second, and third mRNAs are encapsulated in a first LNP, and the fourth and fifth mRNAs are encapsulated in a second LNP. The second LNP may additionally comprise a sixth mRNA. In some embodiments, the sixth mRNA encodes an M1 protein. In some embodiments, the M1 protein encoded by the sixth mRNA is from influenza B virus.

[0228] In some embodiments, the M1, HA, and NA proteins are each encoded by a separate mRNA, and all mRNAs are packaged in a single LNP. For example, an LNP may contain 3, 4, 5, 6, 7, 8, 9, or more mRNA molecules encoding (i) two or more HA proteins, and / or (ii) two or more NA proteins, or (iii) at least one HA protein and at least one NA protein. In some embodiments, an LNP contains two mRNAs encoding HA proteins (e.g., H1 and H3), two mRNAs encoding NA proteins (e.g., N1 and N2), and one mRNA encoding an M1 protein. In some embodiments, the LNP comprises three mRNAs encoding HA proteins (e.g., H1, H3, and influenza B HA), three mRNAs encoding NA proteins (e.g., N1, N2, and influenza B HA), and one mRNA encoding an M1 protein. In some embodiments, the LNP comprises four mRNAs encoding HA proteins (e.g., two influenza A HAs and two influenza B HAs), four mRNAs encoding NA proteins (e.g., two influenza A HAs and two influenza B HAs), and one mRNA encoding an M1 protein.

[0229] In some embodiments, the LNP comprises at least one mRNA encoding an influenza A HA protein (e.g., H1 or H3), at least one mRNA encoding an influenza A NA protein (e.g., N1 or N2), and one mRNA encoding an M1 protein, wherein the HA mRNA, NA mRNA, and M1 mRNA are present in a molar ratio of 40-50:10-50:30-50 (e.g., 40:10:50, 40:40:50, or 50:10:30). In some embodiments, the LNP comprises at least one mRNA encoding an influenza B HA protein (e.g., Yamagata or Victoria), at least one mRNA encoding an influenza B NA protein (e.g., Yamagata or Victoria), and one mRNA encoding an M1 protein, wherein the A mRNA, NA mRNA, and M1 mRNA are present in a molar ratio of 40-50:10-50:30-50 (e.g., 40:10:50, 40:40:50, or 50:10:30). In some embodiments, the compositions described herein include a first LNP comprising at least one mRNA encoding an HA protein (e.g., H1 or H3) of influenza A, at least one mRNA encoding an NA protein (e.g., N1 or N2) of influenza A, and one mRNA encoding an M1 protein, wherein the HA mRNA, NA mRNA, and M1 mRNA are present in a molar ratio of 40-50:10-50:30-50 (e.g., 40:10:50, 40:40:50, or 50:10:30); and a second LNP comprising at least one mRNA encoding an HA protein (e.g., Yamagata or Victoria) of influenza B, at least one mRNA encoding an NA protein (e.g., Yamagata or Victoria), and one mRNA encoding an M1 protein, wherein the HA mRNA, NA mRNA, and M1 mRNA are present in a molar ratio of 40-50:10-50:30-50 (e.g., 40:10:50, 40:40:50, or 50:10:30). and a second LNP in which the mRNA is present at a molar ratio of 40-50:10-50:30-50 (e.g., 40:10:50, 40:40:50, or 50:10:30).

[0230] In some embodiments, the LNP comprises two mRNAs encoding influenza A HA proteins (e.g., H1 and H3), two mRNAs encoding influenza A NA proteins (e.g., N1 and N2), and one mRNA encoding an M1 protein, wherein the HA mRNAs and NA mRNAs are present in a molar ratio of 40:10 or 50:10, or in an equal molar ratio. In some embodiments, the LNP comprises two mRNAs encoding influenza B HA proteins (e.g., H1 and H3), two mRNAs encoding influenza B NA proteins (e.g., N1 and N2), and one mRNA encoding an M1 protein, wherein the HA mRNAs and NA mRNAs are present in a molar ratio of 40:10 or 50:10, or in an equal molar ratio.

[0231] In some embodiments, the M1, HA, and NA proteins are each encoded by a separate mRNA, and each mRNA is separately packaged in the LNP.

[0232] In some embodiments, sets of mRNAs derived from the same influenza virus can be formulated in a single LNP. For example, a first set of mRNAs encoding HA and NA proteins from a first influenza A virus can be packaged in a first LNP. A second set of mRNAs encoding HA and NA proteins from a second influenza A virus can be packaged in a second LNP. A third set of mRNAs encoding HA and NA proteins from an influenza B virus can be packaged in a third LNP. Each set of mRNAs can include an mRNA encoding an HA protein, an mRNA encoding an NA protein, and an mRNA encoding an M1 protein. The M1 protein can be the same for each set. In some embodiments, the HA and NA proteins can be encoded by the same mRNA. The first, second, and third LNPs can each have the same lipid composition. In some embodiments, the first, second, and third LNPs have different lipid compositions.

[0233] In some embodiments, a fourth set of mRNAs encoding HA and NA proteins from influenza B of a different strain than those encoded by the mRNAs in the third set is encapsulated in a fourth LNP. The first, second, third, and fourth LNPs can each have the same lipid composition. In some embodiments, the first, second, third, and fourth LNPs have different lipid compositions.

[0234] In some situations, it may be convenient to encapsulate mRNAs encoding HA and NA proteins from a first and second influenza A strain in a first LNP and mRNAs encoding HA and NA proteins from one or more influenza B strains in a second LNP. Thus, in some embodiments, the first and second sets of mRNAs are encapsulated in the first LNP, and the third and optionally fourth sets of mRNAs are encapsulated in the second LNP. The first and second LNPs may have the same lipid composition. In some embodiments, the first and second LNPs have different lipid compositions.

[0235] polymer In some embodiments, suitable LNP delivery vehicles are formulated using polymers as carriers, either alone or in combination with other carriers, including various lipids, as described herein. Thus, in some embodiments, LNP, as used herein, also encompasses nanoparticles comprising polymers. Suitable polymers may include, for example, polyacrylate, polyalkoxyacrylate, polylactide, polylactide-polyglycolide copolymer, polycaprolactone, dextran, albumin, gelatin, alginate, collagen, chitosan, cyclodextrin, protamine, PEGylated protamine, PLL, PEGylated PLL, and polyethyleneimine (PEI). When PEI is present, it may be branched PEI with a molecular weight ranging from 10 to 40 kDa, e.g., 25 kDa branched PEI (Sigma #408727).

[0236] composition In some embodiments, a composition (e.g., an immunogenic composition or vaccine) according to the invention comprises mRNA at a concentration ranging from about 0.5 mg / mL to about 1.0 mg / mL. In some embodiments, the mRNA is at a concentration of at least 0.5 mg / mL. In some embodiments, the mRNA is at a concentration of at least 0.6 mg / mL. In some embodiments, the mRNA is at a concentration of at least 0.7 mg / mL. In some embodiments, the mRNA is at a concentration of at least 0.8 mg / mL. In some embodiments, the mRNA is at a concentration of at least 0.9 mg / mL. In some embodiments, the mRNA is at a concentration of at least 1.0 mg / mL. In typical embodiments, the mRNA is at a concentration of about 0.6 mg / mL to about 0.8 mg / mL.

[0237] Typically, mRNA in a composition (e.g., an immunogenic composition or a vaccine) is encapsulated in LNPs. To stabilize the mRNA or the LNPs encapsulating it, or to enhance in vivo expression of the mRNA, the compositions of the present invention may be formulated with one or more carriers, stabilizing reagents, or other excipients. Such compositions may be pharmaceutical compositions and, therefore, may contain one or more pharmaceutically acceptable excipients. The one or more pharmaceutically acceptable excipients may be selected from buffers, sugars, salts, surfactants, or combinations thereof.

[0238] pharmaceutically acceptable excipients In some embodiments, a pharmaceutical composition (e.g., an immunogenic composition or a vaccine) may be formulated with a diluent. In some embodiments, the diluent is selected from the group consisting of ethylene glycol, glycerol, propylene glycol, sucrose, trehalose, or a combination thereof. In some embodiments, the diluent is a disaccharide (e.g., trehalose or sucrose). In some embodiments, the formulation comprises 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20% diluent.

[0239] In some embodiments, the LNPs are suspended in an aqueous solution comprising a disaccharide. Disaccharides suitable for use herein include trehalose and sucrose. For example, in some embodiments, the LNPs are suspended in an aqueous solution comprising trehalose, e.g., 10% (w / v) trehalose in water. In other embodiments, the LNPs are suspended in an aqueous solution comprising sucrose, e.g., 10% (w / v) sucrose in water.

[0240] In some embodiments, the aqueous solution further comprises a buffer, a salt, a surfactant, or a combination thereof.

[0241] In some embodiments, the salt is selected from the group consisting of NaCl, KCl, and CaCl. In some embodiments, the salt is NaCl. In some embodiments, the salt is KCl. In some embodiments, the salt is CaCl. In some embodiments, the salt is a combination of KCl and NaCl.

[0242] In some embodiments, the buffer is selected from the group consisting of phosphate buffer, citrate buffer, imidazole buffer, histidine buffer, and Good's buffer. Thus, in some embodiments, the buffer is a phosphate buffer. In some embodiments, the buffer is a citrate buffer. In some embodiments, the buffer is an imidazole buffer. In some embodiments, the buffer is a histidine buffer. In some embodiments, the buffer is Good's buffer. In some embodiments, the Good's buffer is Tris buffer or HEPES buffer.

[0243] In certain embodiments, the buffer is a phosphate buffer (e.g., a citrate-phosphate buffer), a Tris buffer (e.g., TrisHCl), or an imidazole buffer. In some embodiments, the buffer is or comprises an acetate buffer.

[0244] In some embodiments, a composition (e.g., an immunogenic composition or vaccine) comprises a buffer and a salt (typically in addition to a suitable diluent such as a disaccharide or, optionally, propylene glycol). In some embodiments, the total concentration of the buffer and salt is selected from about 40 mM Tris buffer and 75-125 mM NaCl, about 50 mM Tris buffer and 50 mM-100 mM NaCl, about 100 mM Tris buffer and about 100 mM-200 mM NaCl, about 40 mM imidazole and about 100 mM-125 mM NaCl, and about 50 mM imidazole and about 75 mM-100 mM NaCl.

[0245] In some embodiments, the composition (e.g., immunogenic composition or vaccine) comprises a buffer (e.g., phosphate or Tris), a salt (e.g., KCl or NaCl, or both), and a sugar (e.g., a disaccharide such as sucrose or trehalose). In certain embodiments, the composition (e.g., immunogenic composition or vaccine) is an aqueous solution (e.g., comprising water for injection) comprising a buffer, a salt, and a sugar. Additional excipients may include NaOH or HCl (e.g., to adjust the pH of the composition).

[0246] Lipid nanoparticle formulations In some embodiments, the majority of the LNPs in a composition of the invention (e.g., an immunogenic composition or vaccine of the invention), i.e., greater than about 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% of the LNPs, have a size of about 150 nm (e.g., about 145 nm, about 140 nm, about 135 nm, about 130 nm, about 125 nm, about 120 nm, about 115 nm, about 110 nm, about 105 nm, about 100 nm, about 95 nm, about 90 nm, about 85 nm, or about 80 nm). In some embodiments, the LNPs in the compositions of the invention have a size of about 150 nm or less (e.g., about 145 nm or less, about 140 nm or less, about 135 nm or less, about 130 nm or less, about 125 nm or less, about 120 nm or less, about 115 nm or less, about 110 nm or less, about 105 nm or less, about 100 nm or less, about 95 nm or less, about 90 nm or less, about 85 nm or less, or about 80 nm or less). In specific embodiments, the LNPs are 70 nm to about 150 nm in size.

[0247] In some embodiments, greater than about 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% of the LNPs in a composition (e.g., an immunogenic composition or vaccine) provided herein have a size in the range of about 40-90 nm (e.g., about 45-85 nm, about 50-80 nm, about 55-75 nm, or about 60-70 nm). In some embodiments, the LNPs have a size in the range of about 40-90 nm (e.g., about 45-85 nm, about 50-80 nm, about 55-75 nm, or about 60-70 nm). Compositions having LNPs with an average size of about 50-70 nm (e.g., 55-65 nm) may be particularly suitable for delivery by nebulization or inhalation.

[0248] In some embodiments, the degree of dispersity, or a measure of molecular size heterogeneity (polydispersity index; PDI), of the lipid nanoparticles in the pharmaceutical compositions provided herein is less than about 0.5. In some embodiments, the lipid nanoparticles have a PDI less than about 0.5. In some embodiments, the lipid nanoparticles have a PDI less than about 0.4. In some embodiments, the lipid nanoparticles have a PDI less than about 0.3. In some embodiments, the lipid nanoparticles have a PDI less than about 0.28. In some embodiments, the lipid nanoparticles have a PDI less than about 0.25. In some embodiments, the lipid nanoparticles have a PDI less than about 0.23. In some embodiments, the lipid nanoparticles have a PDI less than about 0.20. In some embodiments, the lipid nanoparticles have a PDI less than about 0.18. In some embodiments, the lipid nanoparticles have a PDI less than about 0.16. In some embodiments, the lipid nanoparticles have a PDI less than about 0.14. In some embodiments, the lipid nanoparticles have a PDI less than about 0.12. In some embodiments, the lipid nanoparticles have a PDI less than about 0.10. In some embodiments, the lipid nanoparticles have a PDI of less than about 0.08.

[0249] In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 80%. In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 85%. In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 90%. In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 92%. In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 95%. In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 98%. In some embodiments, the LNPs have an mRNA encapsulation efficiency of greater than about 99%. Typically, LNPs for use in the present invention have an mRNA encapsulation efficiency of at least 90%-95%.

[0250] Therapeutically effective dose The mRNA according to the present invention is provided in a therapeutically effective amount in the pharmaceutical composition, immunogenic composition or vaccine provided herein. As used herein, the term "therapeutically effective amount" is determined primarily based on the total amount of therapeutic agent contained in the pharmaceutical composition of the present invention. Generally, a therapeutically effective amount is sufficient to achieve a meaningful benefit to the subject.

[0251] In some embodiments, a single vial dose contains 1-50 μg of mRNA (e.g., monovalent or multivalent). For example, a single-dose vial or syringe may contain about 2.5 μg, about 5 μg, about 7.5 μg, about 10 μg, about 12.5 μg, or about 15 μg of mRNA, typically administered by intramuscular injection or by mucosal delivery.

[0252] Packaging Compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) can be packaged for parenteral (e.g., intramuscular, intradermal, or subcutaneous) or mucosal (e.g., nasopharyngeal, pulmonary, or intranasal) administration. Vaccine compositions can be in the form of extemporaneous preparations, e.g., lyophilized forms that require reconstitution with a physiological buffer (e.g., PBS) immediately prior to use. In some embodiments, compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) can be provided in the form of an aqueous or frozen aqueous solution and can be administered directly to a subject without reconstitution (after thawing if previously frozen).

[0253] In some embodiments, the compositions of the present invention comprise separate mRNAs, for example, one mRNA encoding an HA protein, one mRNA encoding an NA protein, and one mRNA encoding an M1 protein. In some embodiments, the HA mRNA, NA mRNA, and M1 mRNA are provided in a weight ratio of 1:1:2. In some embodiments, the HA mRNA, NA mRNA, and M1 mRNA are encapsulated in the same lipid nanoparticle.

[0254] In some embodiments, the composition is multivalent, for example, comprising multiple sets each containing HA mRNA, NA mRNA, and M1 mRNA from a different influenza virus. For example, a tetravalent composition may comprise four sets of mRNA, for example, a first set of mRNA from influenza A virus (H1N1), a second set of mRNA from influenza A virus (H3N2), a third set of mRNA from influenza B virus (B / Yamagata), and a fourth set from influenza B virus (B / Victoria). Each set of mRNA may be encapsulated in the same lipid nanoparticle. In some embodiments, the HA mRNA, NA mRNA, and M1 mRNA in each set are provided in a weight ratio of 1:1:2.

[0255] Thus, the present disclosure provides articles of manufacture, e.g., kits, that provide a composition of the invention (e.g., an immunogenic composition or vaccine) in a single container, or that provide a composition (e.g., an immunogenic composition or vaccine) in one container and a physiological buffer for reconstitution in another container. The container may contain a single-use dose or a multi-use dose. The container may be a pre-treated glass vial or ampoule. The article of manufacture may also include instructions for use.

[0256] In certain embodiments, compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) are provided for use by intramuscular injection. The compositions can be injected into a subject, for example, in the deltoid muscle of the subject's upper arm. In some embodiments, compositions (e.g., immunogenic compositions or vaccines) are provided in a pre-filled syringe or injector (e.g., single-chambered or multi-chambered). In some embodiments, compositions (e.g., immunogenic compositions or vaccines) are provided for use by mucosal administration (e.g., as an intranasal spray or sublingually). In some embodiments, compositions (e.g., immunogenic compositions or vaccines) are provided for use by inhalation (e.g., for pulmonary delivery) and are provided in a pre-filled pump, aerosol generator, or inhaler.

[0257] In certain embodiments, compositions of the invention (e.g., immunogenic compositions or vaccines) are provided for use in cutaneous injection, e.g., into the epidermis, dermis, or subcutaneously of the skin. In some embodiments, the compositions are provided in a device suitable for cutaneous injection, such as a needle (e.g., an epidermal, dermal, or hypodermic needle), a needle-free device, a microneedle device, or a microprojection array device. Examples of microneedle or microprojection array devices suitable for dermal injection are described in U.S. Patent Application Publication Nos. 20230270842A1, 20220339416A1, 20210085598A1, 20200246450A1, 20220143376A1, 20180264244A1, 20180263641A1, and 20110245776A1.

[0258] therapeutic use In some embodiments, the invention provides a method of eliciting an immune response in a subject, the method comprising administering to the subject an effective amount of a composition of the invention (e.g., an immunogenic composition or vaccine of the invention). In some embodiments, the invention provides a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) for eliciting an immune response in a subject. In some embodiments, the invention provides the use of a composition of the invention in a method of manufacturing a medicament, wherein the composition is for eliciting (e.g., formulated to elicit) an immune response in a subject.

[0259] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) induces an immune response in a subject against one or more influenza viruses. In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) induces an immune response against influenza A virus. In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) induces an immune response against influenza B virus. In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) induces an immune response against influenza A virus and influenza B virus. In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) induces an immune response against different subtypes and / or strains of influenza virus.

[0260] In some embodiments, the compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) are administered prophylactically. In some embodiments, the invention provides methods for reducing the severity of influenza infection in a subject, comprising administering to the subject an effective amount of a composition of the invention (e.g., immunogenic compositions or vaccines of the invention). In some embodiments, the invention provides compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) for use in reducing the severity of one or more symptoms of influenza infection in a subject. In some embodiments, the invention provides use of a composition of the invention in a method for manufacturing a medicament, wherein the composition is for (e.g., formulated for) reducing the severity of one or more symptoms of influenza infection in a subject. In some embodiments, the invention provides methods for reducing the severity of one or more symptoms of infection with influenza A virus and / or influenza B virus. In some embodiments, the invention provides methods for reducing the severity of one or more symptoms of infection with influenza viruses of different subtypes and / or lineages.

[0261] In some embodiments, the invention provides a method of preventing influenza infection in a subject, the method comprising administering to the subject an effective amount of a composition of the invention (e.g., an immunogenic composition or vaccine of the invention). In some embodiments, the invention provides a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) for use in preventing influenza infection in a subject. In some embodiments, the invention provides use of a composition of the invention in a method of manufacturing a medicament, wherein the composition is for (e.g., formulated for) preventing influenza infection in a subject. In some embodiments, the invention provides methods of preventing infection by influenza A virus and / or influenza B virus. In some embodiments, the invention provides methods of preventing infection by influenza viruses of different subtypes and / or lineages.

[0262] In various embodiments, the immunization methods provided herein induce a broadly neutralizing immune response against one or more influenza viruses. In some embodiments, the immune response comprises an antibody response. Thus, in various embodiments, the compositions described herein may provide broad cross-protection against various types of influenza viruses. In some embodiments, the compositions provide cross-protection against avian, swine, seasonal, and / or pandemic influenza viruses.

[0263] In some embodiments, the compositions provide cross-protection against one or more influenza A or B and / or one or more subtypes of influenza A or strains of influenza B, particularly seasonal strains. In some embodiments, the compositions provide cross-protection against multiple strains of seasonal influenza viruses. For example, in some embodiments, the compositions provide cross-protection against seasonal influenza A H1 subtype viruses (e.g., H1N1), seasonal influenza A H3 subtype viruses (e.g., H3N2), and one or both circulating influenza B viruses (e.g., influenza B / Yamagata and / or influenza B / Victoria).

[0264] In some embodiments, the methods of the invention can elicit an improved immune response against one or more pandemic influenza strains, including, among others, H1N1, H5N1, H2N2, H3N2, H9N2, H7N7, H7N3, H7N9, and H10N7 subtypes.

[0265] In some embodiments, the methods of the present invention can elicit an improved immune response against one or more swine influenza strains.

[0266] In some embodiments, the methods of the present invention can elicit an improved immune response against one or more avian influenza strains. Exemplary avian strains include, but are not limited to, H5N1, H7N3, H7N7, H7N9, and H9N2. Additional influenza pandemic, seasonal, avian, and / or swine strains are known in the art.

[0267] In some embodiments of the invention, administration of a composition (e.g., an immunogenic composition or vaccine) of the invention provides immunity against influenza infection caused by strains A and / or B. In some embodiments, administration provides immunity against infection caused by multiple subtypes (e.g., H1N1 and H3N2) or strains (e.g., Victoria and Yamagata) of the same type of influenza (e.g., A or B). For example, in some embodiments, immunity is provided against two or more influenza A subtypes. In some embodiments, immunity is provided against one or more (e.g., two) influenza A subtypes (e.g., H1N1 and H3N2) and one or more strains of influenza B (e.g., Victoria and / or Yamagata).

[0268] In some embodiments, the compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) are used as seasonal and / or pandemic influenza vaccines, or as part of an influenza vaccination regimen intended to confer long-term (multi-seasonal) protection.

[0269] The compositions of the invention (e.g., immunogenic compositions or vaccines of the invention) can be administered to a subject in need thereof in a therapeutically effective amount, i.e., an amount that provides sufficient immune protection against the target pathogen for a sufficient time (e.g., 1 year, 2 years, 5 years, 10 years, or a lifetime). Sufficient immune protection can be, for example, prevention or alleviation of symptoms associated with infection by the pathogen. In some embodiments, multiple doses of the vaccine (e.g., two doses) are injected into a subject in need thereof to achieve the desired therapeutic effect. The doses (e.g., a primary dose and a booster dose) can be separated by, for example, 1 week, 2 weeks, 3 weeks, 4 weeks, 1 month, 2 months, 3 months, 4 months, 5 months, 6 months, 1 year, 2 years, 5 years, or 10 years.

[0270] In alternative embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) is administered after influenza symptoms and / or confirmation that the subject has an influenza infection. In some embodiments, the subject has or is susceptible to an influenza infection. In some embodiments, a subject is considered to have an influenza infection if the subject exhibits one or more symptoms commonly associated with influenza infection.

[0271] In some embodiments, a subject is known to have been exposed or is believed to have been exposed to an influenza virus. In some embodiments, a subject is considered susceptible to influenza infection if the subject is known to have been exposed or is believed to have been exposed to an influenza virus. In some embodiments, a subject is known to have been exposed or is considered to have been exposed to an influenza virus if the subject has been in contact with other individuals known to have been or are suspected to have been infected with the influenza virus and / or if the subject is present or has been present in an area where influenza infection is known or believed to be prevalent.

[0272] In some embodiments, a composition of the invention (e.g., an immunogenic composition or vaccine of the invention) is administered as a single dose, e.g., by intramuscular administration or mucosal delivery. In some embodiments, a booster dose is administered about one year or more after the initial administration. In some embodiments, a booster dose is administered five years later.

[0273] subject In some embodiments, the subject is a human. In some embodiments, the subject is healthy. In certain embodiments, the subject is an adult, an adolescent, or an infant.

[0274] In some embodiments, the subject is at an age that places the subject at high risk of developing serious complications from infection with an influenza virus. In some embodiments, the human subject is under 6 months of age. In some embodiments, the human subject is under 2 years of age. In some embodiments, the human subject is under 5 years of age. In some embodiments, the human subject is 55 years of age or older, e.g., 60 years of age or older, 65 years of age or older, or 70 years of age or older. In some embodiments, the subject is at least 65 years of age.

[0275] In some embodiments, the subject has a condition that places the subject at higher risk of developing serious complications from infection with an influenza virus. In some embodiments, the subject is a pregnant woman. In some embodiments, the subject suffers from a pulmonary condition (e.g., chronic lung disease). In some embodiments, the subject suffers from asthma. In some embodiments, the subject suffers from COPD.

[0276] In some embodiments, the subject resides in a nursing home or long-term care facility.

[0277] In some embodiments, the subject is a non-human mammal. In some embodiments, the subject is a livestock or pet (e.g., a dog, cat, sheep, cow, and / or pig). In some embodiments, the subject is a non-human primate. In some embodiments, the subject is an avian species (e.g., a chicken). [Example]

[0278] The following examples are included for illustrative purposes only and are not intended to limit the scope of the invention.

[0279] Example 1: In vitro transcription of mRNA This example demonstrates the synthesis of messenger RNA (mRNA) encoding hemagglutinin (HA), neuraminidase (NA), and matrix 1 (M1) proteins from influenza A / H1N1 and A / H3N2 viruses.

[0280] Sequence-optimized nucleotide sequences encoding the M1 protein from A / California / 07 / 2009, the HA-H1 protein from A / California / 07 / 2009 (H1N1), the NA-N1 protein from A / Michigan / 45 / 2015 (H1N1), the HA-H3 protein from A / Minnesota / 07 / 2008 (H3N2), and the NA-N2 protein from A / Minnesota / 07 / 2008 (H3N2) were prepared. The codon-optimized sequences were separately inserted into plasmids containing appropriate 5' and 3' UTR sequences and an RNA polymerase promoter. Prior to in vitro transcription (IVT), the plasmids were linearized with restriction endonucleases.

[0281] IVT reactions were performed using linearized DNA template plasmid, NTPs (ATP, GTP, CTP, UTP), and RNA polymerase in an appropriate IVT reaction buffer supplemented with DTT, pyrophosphate, and RNase inhibitors. The IVT reaction was carried out for 90 minutes at 37°C. The reaction was terminated by treatment with DNase I to remove the template plasmid. The resulting IVT mRNA was purified by precipitation with guanidine thiocyanate.

[0282] Purified IVT mRNA was capped by incubation with S-adenosylmethionine, RNase inhibitor, 2'-O-methyltransferase, and guanylyltransferase in a suitable capping reaction buffer for 90 minutes at 37°C. After capping, a tailing reaction was performed with ATP and polyA polymerase in a suitable tailing reaction buffer for 30 minutes at 37°C. The reaction was stopped by the addition of EDTA, followed by a 5 minute incubation at 37°C and mRNA purification as described above.

[0283] Example 2: Evaluation of neuraminidase (NA) activity This example demonstrates that NA activity is observed in the supernatant after transfection of mammalian cells with mRNA encoding the NA protein of influenza virus. This activity is also observed when cells are transfected with multiple mRNAs encoding NA proteins or with mRNAs encoding M1 and one or more HA proteins.

[0284] mRNAs encoding the HA, NA, and M1 proteins were prepared as described in Example 1. HEK293T cells were transfected with either a single mRNA encoding influenza virus protein N1 or N2, three mRNAs encoding influenza virus proteins H1, N1, and M1 or H3, N2, and M1, or five mRNAs encoding influenza virus proteins H1, N1, H3, N2, and M1, respectively. Transfection was performed using the TransIT-mRNA transfection kit. Untransfected cells and cells transfected with mRNA encoding eGFP were included as negative and positive controls, respectively. Cells were counted 48 hours after transfection to assess cell viability.

[0285] NA activity was determined using supernatants harvested from transfected HEK293T cells. Enzyme activity was measured using the NA-Fluor™ Influenza Neuraminidase Assay Kit. A standard curve was generated using 4-methylimbelliferone sodium salt, and after 1 hour of incubation at 37°C, fluorescence was detected using a Varioskan reader. NA activity titers were measured in μM / h. Three independent measurements were performed for each sample.

[0286] The results are summarized in Figure 1. NA activity was detected in the supernatants of all cells transfected with mRNA encoding the NA protein. NA activity was also observed when cells were additionally transfected with mRNA encoding the M1 protein, one or two mRNAs encoding the NA proteins (N1 and / or N2), and one or two mRNAs encoding the HA proteins (H1 and / or H3). Interestingly, NA activity was approximately 2.5- to 3-fold higher in cells transfected with mRNA encoding N2 compared to cells transfected with mRNA encoding N1. Transfecting cells with both N1 and N2 did not further increase the measured NA activity.

[0287] The data in this example demonstrate that mRNAs encoding M1, HA and NA proteins can be expressed together in the same cell to produce VLPs with an active NA protein.

[0288] Example 3: Evaluation of hemagglutinin (HA) activity This example demonstrates that mRNA encoding the HA protein of influenza virus can induce mammalian cells to express functional hemagglutinin (HA) activity.

[0289] mRNAs encoding the HA, NA, and M1 proteins were prepared as described in Example 1. HEK293T cells were transfected with a single mRNA encoding either H1 or H3, two mRNAs encoding either H1 or H3 and M1 proteins, three mRNAs encoding either H1, N1, and M1 proteins, H3, N2, and M1 proteins, or H1, H3, and M1 proteins, or five mRNAs encoding influenza proteins H1, N1, H3, N2, and M1, respectively. Transfections were performed in the same manner as described in Example 2.

[0290] HA functionality was determined by calculating hemagglutination unit (HAU) titers using supernatants from HEK293T cells transfected with mRNA. Serial dilutions of the supernatants were incubated with 50 μL of 0.5% (v / v) turkey red blood cells at 4°C for 45–60 min. The HAU titer of the suspension was defined as the reciprocal of the highest dilution showing complete hemagglutination. Hemagglutination values ​​for both unconcentrated and concentrated (5x) supernatants are shown in Table 1. Previously purified and concentrated VLPs prepared using the H1 and N1 proteins of influenza virus A / Michigan / 45 / 2015 and the H3 and N2 proteins of A / Hong Kong / 4801 / 2014, respectively, served as positive controls. Supernatant from cells transfected without mRNA was used as a negative control.

[0291] [Table 1]

[0292] Hemagglutination was observed in all concentrated supernatants obtained from cells transfected with mRNA encoding the H1 subtype HA protein, indicating that the cells expressed the protein in its active form. This observation was independent of cells additionally transfected with one or more mRNAs encoding another HA protein (H3), one or more NA proteins (N1, or N1 and N2), and / or an mRNA encoding the M1 protein.

[0293] In the absence of H1 subtype HA protein, hemagglutination was not observed for cells transfected with mRNA encoding H3 subtype HA protein. This is not surprising, as hemagglutination can be difficult to detect with H3 subtype HA protein. To confirm that H3 subtype HA protein was expressed, Western blots were performed using a polyclonal anti-H3 antibody (rabbit, SIGMA). Briefly, cell lysates were separated on NuPAGE gels (Invitrogen). The separated proteins were blotted onto nitrocellulose membranes (BioRAD) and probed with anti-H3 antibody. An anti-rabbit antibody (Rockland, DyLight) was used for detection using the Odyssey Imaging System (LICOR).

[0294] As can be seen in Figure 2, H3 protein was readily detected in cells transfected with mRNAs encoding (i) H3 and M1 proteins, (ii) H3, N2, and M1 proteins, (iii) H1, N1, H3, N2, and M1 proteins, and (iv) H1 and H3 proteins. For unknown reasons, only a very faint H3 band was detected when cells were transfected with a single mRNA encoding H3 protein.

[0295] The data in this example demonstrate that mRNAs encoding M1, HA and NA proteins can be expressed together in the same cell to produce VLPs with functional HA proteins.

[0296] Example 4: Visualization of influenza VLPs by negative stain transmission electron microscopy (NS-TEM) This example demonstrates that mammalian cells transfected with mRNA encoding the M1, HA, and NA proteins are capable of producing VLPs. This example also demonstrates that VLP budding is significantly reduced when mammalian cells are transfected with only mRNA encoding the M1 and HA proteins.

[0297] Negative-stain transmission electron microscopy (NS-TEM) was performed to visualize VLP formation in mammalian cells transfected with mRNAs encoding the M1, HA, and NA proteins. HEK293T cells were transfected with three different combinations of mRNA. mRNA encoding the HA, NA, and M1 proteins was prepared as described in Example 1. Some cells were transfected with a combination of three mRNAs encoding either the M1 protein and two HA proteins (H1 and H3), or one HA protein (H1 or H3, respectively) and one NA protein (N1 or N2, respectively). Other cells were transfected with five mRNAs encoding the M1 protein, two HA proteins (H1 and H3), and two NA proteins (N1 and N2, respectively).

[0298] The cell supernatant from transfected cells was incubated on a previously ionized continuous carbon film TEM grid in a plasma cleaner. Excess material was absorbed using filter paper, and the adsorbed particles were negatively stained with 2% uranyl acetate and imaged.

[0299] The supernatants of HEK293T cells transfected with mRNAs encoding (i) H1, N1, H3, N2, and M1, (ii) H1, N1, and M1, (iii) H3, N2, and M1, and (iv) H1, H3, and M1 contained vesicles, indicating the production and release of VLPs by the transfected cells. No vesicles were observed in the supernatants of mock-transfected cells. Importantly, only very small amounts of vesicles were observed in the supernatants of cells transfected with mRNAs encoding H1, H3, and M1.

[0300] This example demonstrates that mammalian cells transfected with mRNA encoding the M1, HA, and NA proteins can produce VLPs. This example also demonstrates that VLP formation can still occur when mammalian cells are transfected with mRNA encoding only the M1 and HA proteins. However, VLP formation is greatly reduced, indicating that efficient budding of VLPs from the cell surface is coupled to expression of the NA protein.

[0301] Example 5: Visualization of influenza VLPs by cryo-transmission electron microscopy (Cryo-TEM) This example demonstrates that mammalian cells transfected with mRNA encoding the M1 protein and mRNA encoding multiple HA and NA proteins can produce VLPs, even when the coding sequences are derived from different influenza viruses.

[0302] To determine the size of VLPs produced by mRNA-transfected mammalian cells, cryo-transmission electron microscopy (cryo-TEM) was performed to observe VLP budding from the cell membrane. mRNA encoding the HA, NA, and M1 proteins was prepared as described in Example 1. HEK293T cells were transfected with either three mRNAs encoding the M1 protein, one HA protein (H3), and one NA protein (N2), or five mRNAs encoding the M1 protein, two HA proteins (H1 and H3), and two NA proteins (N1 and N2). Mock-transfected cells (no mRNA) were included as a control. After glow discharge in an ELMO ionizer, samples were deposited onto Quantifoil R2 / 2 copper 200-mesh grids. Grids were blotted, frozen, and transferred for visualization by cryo-TEM.

[0303] Exemplary images are shown in Figure 3. Panel A shows mock-transfected cells. No VLPs were visible. Panels B and C show representative images of VLPs from cells transfected with either three mRNAs (H3 / N2 / M1; panel B) or five mRNAs (H1 / N1 / H3 / N2 / M1; panel C). VLPs could be observed with heterogeneous spikes of glycoproteins similar to those of influenza viruses. The observed VLPs were approximately 100 nm in size, thus similar to the size of influenza viruses. Notably, this was the case when cells were transfected with mRNA encoding the HA and NA proteins from different influenza viruses (A / California / 07 / 2009 [H1], and A / Michigan / 45 / 2015 [N1] and A / Minnesota / 07 / 2008 [H3 and N2], respectively), or even when the M1 protein and the HA and NA proteins were from different influenza viruses (A / California / 07 / 2009 [H1N1] and A / Minnesota / 07 / 2008 [H3N2], respectively).

[0304] This example demonstrates that mammalian cells transfected with mRNA encoding the M1 protein and mRNA encoding two HA and two NA proteins from different influenza viruses can produce VLPs. Similarly, the coding sequence of the mRNA encoding the M1 protein can be derived from a different virus than the coding sequences of the mRNA encoding the HA and NA proteins.

[0305] Example 6: Transfection with influenza A and influenza B proteins allows VLP formation This example demonstrates that mRNA encoding both M1 and influenza glycoproteins from either type A or type B can produce VLPs.

[0306] To determine whether VLPs can be produced from both influenza A and B viruses, four different strains were investigated. Sequence-optimized nucleotide sequences encoding the HA and NA proteins from A / Darwin / 6 / 2021 (H3N2), A / Wisconsin / 588 / 2019 (H1N1), B / Phuket / 3073 / 2013 (B / Yamagata lineage), and B / Austria / 1359417 / 2021 (B / Victoria lineage) were prepared. As in the previous example, the same sequence-optimized nucleotide sequence encoding the M1 protein from A / California / 07 / 2009 was used. The codon-optimized sequences were separately inserted into plasmids containing appropriate 5' and 3' UTR sequences and an RNA polymerase promoter. Prior to IVT, the plasmids were linearized with restriction endonucleases. The IVT reaction was performed as described in Example 1.

[0307] Expi293F cells were transfected with three mRNAs encoding influenza virus proteins using the method described in Example 2. Four combinations (Darwin, Wisconsin, Phuket, and Austria) were tested, as shown in Table 2. For each transfection, mRNAs encoding HA, NA, and M1 were transfected at a molar ratio of 40:10:50, respectively.

[0308] [Table 2]

[0309] An enzymatic NA activity assay using supernatants harvested from transfected Expi293F cells was performed by the method described in Example 2. The results are summarized in Figure 4. NA activity was detectable in all supernatants harvested from transfected Expi293F cells except for the Austrian strain. Compared to purified VLPs (positive control), NA activity was low in this experiment. Western blot confirmed weak NA protein expression (data not shown).

[0310] M1 and HA expression in cell lysates and supernatant extracts from transfected Expi293F cells was assessed by Western blot. The reagents used for detection are listed in Table 3.

[0311] [Table 3]

[0312] Both concentrated (25x) and non-concentrated supernatant extracts were analyzed. HA expression was determined using monoclonal influenza A or B anti-HA antibodies. The results are shown in Figure 5A (influenza A) and Figure 5B (influenza B), respectively. HA expression was detected in cell lysates, concentrated supernatant extracts, and non-concentrated supernatant extracts from all experimental conditions. No signal was detected in the lysates and supernatants of mock-transfected cells (negative control). HA is a homotrimer, with each protomer consisting of an HA1 chain and an HA2 chain connected via a single disulfide bridge. The HA2 subunit could be detected in each of the cell lysates but not in the cell supernatant.

[0313] M1 expression was determined using a polyclonal anti-M1 antibody. As shown in Figure 6, M1 was detected in the cell lysates and concentrated supernatants of transfected cells (Panel A) but not in the non-concentrated supernatant samples (Panel B). Only trace amounts were detectable in the concentrated supernatants. Band intensity was greatest in the cell lysate samples. Nonspecific binding was observed in samples containing cell lysates and concentrated supernatants, including the negative control sample. However, the M1-specific band was clearly distinguishable. M1 was not observed in the cell lysates or supernatants of mock-transfected cells (lipofectant only, negative control).

[0314] As described in Example 5, VLPs produced by mRNA-transfected mammalian cells were visualized using Cryo-TEM. Exemplary images are shown in Figure 7. Panel A shows a representative image of mock-transfected cells. In this condition, no VLPs were found. Only heterogeneous smooth vesicles (white arrows) (likely artifacts from the transfection process) and protein debris (black outline arrows) were observed.

[0315] Representative images of VLPs from cells transfected with influenza A strains M1 plus HA and NA from Darwin and Wisconsin are shown in panels B and C, respectively. Panels D and E show representative images of VLPs from cells transfected with influenza B strains M1 plus HA and NA from Phuket and Austria, respectively. VLPs densely packed with glycoproteins (solid arrows) were observed in all four conditions. The size of the VLPs ranged from approximately 50 to 300 nm, with the majority exceeding 100 nm.

[0316] This example demonstrates that mammalian cells transfected with mRNA encoding the M1 protein and mRNA encoding the HA and NA from either influenza A or influenza B are capable of producing VLPs. The data further support the use of the same coding sequence for the M1 protein regardless of the influenza type and strain from which the HA and NA proteins are derived.

[0317] Example 7: Mouse Immunization This example outlines a mouse study to test the immunogenicity of a composition comprising mRNA encoding the HA, NA, and M1 proteins described in Example 6.

[0318] A monovalent mRNA composition containing three sequence-optimized mRNAs encoding the HA and NA proteins of influenza strain B / Phuket / 3073 / 2013 (Yamagata) and the M1 protein of influenza strain A / California / 07 / 2009 was prepared. The mRNAs were encapsulated in lipid nanoparticles (LNPs) containing the cationic lipid GL-HEPES-E3-E12-DS-4-E10, the non-cationic lipid DOPE, cholesterol, and the PEG-modified lipid DMG-PEG-2K at a molar ratio of 40:30:28.5:1.5. The final mRNA-LNP formulation was provided as an aqueous suspension. The mRNAs encoding HA, NA, and M1 were provided in a weight ratio of 1:1:2, respectively, in the final composition used for immunization.

[0319] In parallel, tetravalent mRNA compositions containing four sets of mRNAs are prepared. Set 1 contains three sequence-optimized mRNAs encoding the HA and NA proteins of influenza strain B / Phuket / 3073 / 2013 (Yamagata) and the M1 protein of A / California / 07 / 2009. Set 2 contains three sequence-optimized mRNAs encoding the HA and NA proteins of influenza strains A / Darwin / 6 / 2021 and A / Tasmania / 503 / 2020 (H3N2), respectively, and the M1 protein of A / California / 07 / 2009. Set 3 contains three sequence-optimized mRNAs encoding the HA and NA proteins of influenza strain A / Wisconsin / 588 / 2019 (H1N1) and the M1 protein of A / California / 07 / 2009. Set 4 contains three sequence-optimized mRNAs encoding the HA and NA proteins of influenza strains B / Austria / 1359417 / 2021 and B / Washington / 02 / 2019 (Victoria), respectively, and the M1 protein of A / California / 07 / 2009. Each mRNA set is separately encapsulated in the same LNP as the monovalent composition. For each set, the mRNAs encoding HA, NA, and M1 are provided in a weight ratio of 1:1:2, respectively, in the final composition used for immunization.

[0320] As controls, mRNA compositions corresponding to the monovalent and tetravalent compositions are provided in which the mRNA encoding the M1 protein is replaced with mRNA encoding the T epitope from Epstein-Barr virus (EBV). The tetravalent recombinant influenza vaccine Flublok and the tetravalent inactivated split virion vaccine Vaxigrip Tetra are provided as immunization controls. The HA and NA proteins in Flublok and Vaxigrip Tetra correspond to those encoded by the respective HA and NA mRNAs in the tetravalent mRNA composition. Phosphate-buffered saline (PBS) serves as a negative control.

[0321] Each of the compositions is administered to mice by intramuscular (IM) injection on days 0 and 21. Nine groups of BALB / c mice are immunized (n=8). Group 1 receives 2 μg total mRNA per injection of the monovalent mRNA composition. Group 2 receives 8 μg total mRNA per injection of the monovalent mRNA composition. Groups 3 and 4 receive 2 μg and 8 μg total of the monovalent control mRNA composition per injection, respectively. Group 5 receives 8 μg total mRNA per injection of the tetravalent mRNA composition. Group 6 receives 8 μg total mRNA per injection of the control tetravalent mRNA composition. Group 7 receives 1 / 10 human dose of Flublok per injection. Group 8 receives 1 / 10 human dose of Vaxigrip Tetra per injection. Group 9 receives PBS.

[0322] Mice are sacrificed on day 42. Blood is collected to assess IgG production (total IgG) and anti-HA / anti-NA functional antibodies using ELISA, hemagglutination inhibition (HAI) assay, and neuraminidase activity inhibition (NAI) assay, respectively.

Claims

1. A composition comprising one or more messenger RNAs (mRNAs) encoding (i) an influenza virus matrix 1 (M1) protein and (ii) one or more influenza virus hemagglutinin (HA) proteins and / or one or more influenza virus neuraminidase (NA) proteins, wherein the M1 protein and the one or more HA proteins and / or the one or more NA proteins are capable of inducing a mammal to produce virus-like particles (VLPs).

2. 2. The composition of claim 1, wherein the one or more mRNAs encode two or more HA proteins and / or two or more NA proteins, and each of the two or more HA proteins and each of the two or more NA proteins is from a different influenza virus.

3. 3. The composition of claim 2, wherein at least one of the two or more HA proteins and / or at least one of the two or more NA proteins is from an influenza virus different from the influenza virus from which the M1 protein is derived.

4. 4. The composition of claim 3, wherein the two or more HA proteins and / or the two or more NA proteins are from different influenza A subtypes.

5. 5. The composition of claim 3 or 4, wherein at least one of the two or more HA proteins and / or at least one of the two or more NA proteins is from an influenza B virus.

6. The composition of any one of claims 1 to 5, wherein the M1 protein is from a pandemic influenza virus.

7. The composition of any one of claims 1 to 5, wherein the M1 protein is from an H1N1 influenza A virus.

8. 8. The composition of claim 1, wherein the M1 protein has a serine at position 30, an alanine at position 142, an asparagine at position 207, and a threonine at position 209.

9. The composition of any one of claims 1 to 5, wherein the M1 protein is encoded by a distinct mRNA.

10. The composition of any one of claims 2 to 9, wherein at least one of the two or more NA proteins has an activity of 2000 μM / hr or greater as determined by a neuraminidase activity assay.

11. The composition of any one of claims 4 to 10, wherein the two or more NA proteins comprise two NA proteins from different influenza A subtypes.

12. 12. The composition of claim 11, wherein the different influenza A subtypes are N1 and N2.

13. 13. The composition of claim 11 or 12, wherein the composition is capable of inducing the expression of a VLP in the mammalian cell, the VLP comprising the two NA proteins from different influenza A subtypes.

14. The composition of any one of claims 4 to 13, wherein the two or more HA proteins comprise two HA proteins from different influenza A subtypes.

15. 15. The composition of claim 14, wherein the different influenza A subtypes are H1 and H3.

16. 16. The composition of claim 14 or 15, wherein the composition is capable of inducing the expression of a VLP in the mammalian cell, the VLP comprising the two HA proteins from different influenza A subtypes.

17. The composition of any one of claims 1 to 16, wherein the one or more mRNAs are encapsulated in one or more lipid nanoparticles (LNPs).

18. The composition of any one of claims 1 to 17, wherein each HA protein and each NA protein is encoded by a separate mRNA.

19. 19. The composition of claim 18, wherein the composition comprises 3, 4, 5, 6, 7, 8, or 9 mRNA molecules encoding an M1 protein and (i) 2, 3, 4, 5, 6, 7, or 8 HA proteins, (ii) 2, 3, 4, 5, 6, 7, or 8 NA proteins, or (iii) 1, 2, 3, or 4 HA proteins and 1, 2, 3, or 4 NA proteins.

20. 20. The composition of claim 19, wherein the 3, 4, 5, 6, 7, 8, or 9 mRNAs are encapsulated in the same LNP.

21. The composition of any one of claims 1 to 17, wherein the composition comprises one mRNA encoding the M1 protein and at least one mRNA encoding one HA protein and one NA protein.

22. 22. The composition of claim 21, wherein the composition comprises a first mRNA encoding a first HA protein and a first NA protein, a second mRNA encoding a second HA protein and a second NA protein, and a third mRNA encoding the M1 protein, wherein the first HA protein and the first NA protein are from a first influenza virus and the second HA protein and the second NA protein are from a second influenza virus.

23. 23. The composition of claim 22, wherein the first and second influenza viruses are influenza A viruses of different subtypes.

24. 24. The composition of claim 23, wherein the different subtypes are H1N1 and H3N2.

25. 25. The composition of any one of claims 22 to 24, wherein the composition further comprises a fourth mRNA encoding a third HA protein and a third NA protein, wherein the third HA protein and the third NA protein are from a third influenza virus.

26. 26. The composition of claim 25, wherein the third influenza virus is an influenza B virus.

27. 27. The composition of claim 25 or 26, wherein the composition further comprises a fifth mRNA encoding a fourth HA protein and a fourth NA protein, the fourth HA protein and the fourth NA protein being from a fourth influenza virus.

28. 28. The composition of claim 27, wherein the third and fourth influenza viruses are from the Yamagata and Victoria lineages, respectively.

29. 29. The composition of any one of claims 21 to 28, wherein the first, second, fourth, and fifth mRNAs comprise, in 5' to 3' order, if applicable, (i) a coding sequence for the HA protein, (ii) a nucleotide sequence encoding an internal ribosome entry site (IRES) or a 2A peptide, and (iii) a coding sequence for the NA protein.

30. The composition of any one of claims 21 to 29, wherein the mRNA is encapsulated in the same LNP.

31. 29. The composition of claim 27 or 28, wherein the first, second, and third mRNAs are encapsulated in a first LNP, and the fourth and fifth mRNAs are encapsulated in a second LNP.

32. 32. The composition of claim 31 , wherein the second LNP further comprises a sixth mRNA encoding an M1 protein.

33. 33. The composition of claim 32, wherein the M1 protein encoded by the sixth mRNA is from an influenza B virus.

34. The composition of any one of claims 31 to 33, wherein the first LNP and the second LNP comprise the same lipid component.

35. 35. The composition of any one of claims 1 to 34, wherein the composition further comprises mRNA further encoding influenza virus matrix 2 (M2) protein.

36. 36. The composition of any one of claims 1 to 35, wherein the VLPs are about 50 nm to about 200 nm in size.

37. 37. The composition of claim 36, wherein the VLP is about 100 nm in size.

38. The composition of any one of claims 1 to 37, wherein the mammalian cells are human cells.

39. 39. The composition of any one of claims 1 to 38, wherein the one or more mRNAs are sequence-optimized.

40. 40. The composition of any one of claims 1 to 39, wherein the mRNA comprises a polyadenylation (polyA) sequence comprising from about 100 nucleotides to about 500 nucleotides.

41. 41. The composition of claim 40, wherein the polyA sequence comprises about 200 nucleotides.

42. 41. The composition of claim 40, wherein the polyA sequence comprises about 500 nucleotides.

43. 43. The composition of any one of claims 17 to 42, wherein the lipid component of the LNP comprises or consists of a cationic lipid, a non-cationic lipid, a PEG-modified lipid, and optionally a sterol-based lipid.

44. (a) The cationic lipid is cKK-E12, cKK-E10, HGT5000, HGT5001, ICE, HGT4001, HGT4002, HGT4003, TL1-01D-DMA, TL1-04D-DMA, TL1-08D-DMA, TL1-10D-DMA, OF-Deg-Lin, OF-02, GL-HEPES-E3-E12-DS-4-E10, GL-TES-SA-DMP-E18-2, GL-TES-SA-DME-E18-2, SY-3-E14-DMA Pr, TL1-10D-DMA, HEP-E3-E10, HEP-E4-E10, RL3-DMA-07D, RL2-DMP-07D, cHse-E-3-E10, cHse-E-3-E12, cDD-TE-4-E12, SI-4-E14-DMAPr, TL-1-12D-DMA, SY-010, SY-011, IM-001, and 4-hydroxybutyl)azanediyl)bis(hexane-6,1-diyl)bis(2-hexyldecanoate (ALC-0315); (b) the non-cationic lipid is selected from DSPC (1,2-distearoyl-sn-glycero-3-phosphocholine), DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine), DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine), DEPE 1,2-dierucoyl-sn-glycero-3-phosphoethanolamine, DOPC (1,2-dioleoyl-sn-glycero-3-phosphotidylcholine), DPPE (1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine), DMPE (1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine), and DOPG (1,2-dioleoyl-sn-glycero-3-phospho-(1′-rac-glycerol)); (c) the PEG-modified lipid is selected from DMG-PEG-2K and 2-[(polyethylene glycol)-2000]-N,N-ditetradecylacetamide (ALC-0159); and / or (d) the sterol is cholesterol; 44. The composition of claim 43.

45. 45. The composition of claim 43 or 44, wherein the cationic lipid is selected from cKK-E10, OF-02, GL-HEPES-E3-E12-DS-4-E10, IM-001, and ALC-0315.

46. The composition of any one of claims 43 to 45, wherein the PEG-modified lipid is selected from DMG-PEG2K or ALC-0159.

47. 47. The composition of any one of claims 43 to 46, wherein the non-cationic lipid is selected from DOPE or DSPC.

48. 48. The composition of any one of claims 17 to 47, wherein the LNPs are about 70 nm to about 150 nm in size.

49. The composition of any one of claims 1 to 48, wherein the composition is a vaccine composition.

50. A pharmaceutical composition comprising the composition of any one of claims 1 to 49 and one or more pharmaceutically acceptable excipients.

51. 51. The pharmaceutical composition of claim 50, wherein the one or more pharmaceutically acceptable excipients are selected from salts, sugars, buffering agents, and combinations thereof.

52. 52. The pharmaceutical composition of claim 51, wherein the salt is sodium chloride, potassium chloride, or a combination of both.

53. 53. The pharmaceutical composition of claim 51 or 52, wherein the sugar is a disaccharide.

54. 54. The pharmaceutical composition of claim 53, wherein the disaccharide is sucrose or trehalose.

55. 55. The pharmaceutical composition of any one of claims 51 to 54, wherein the buffering agent is selected from phosphate, Tris, imidazole and histidine.

56. 56. The pharmaceutical composition of claim 55, wherein the buffering reagent is phosphate or Tris.

57. 57. A composition according to any one of claims 1 to 48, a vaccine composition according to claim 49 or a pharmaceutical composition according to any one of claims 50 to 56 for use in a method of inducing an immune response against one or more influenza viruses in a subject.

58. 58. The vaccine or pharmaceutical composition for use according to claim 57, wherein said immune response is effective to reduce the severity of one or more symptoms associated with infection by said one or more influenza viruses in said subject.

59. 58. The vaccine or pharmaceutical composition for use according to claim 57, wherein said immune response is effective in preventing infection by said one or more influenza viruses in said subject.

60. 60. The vaccine or pharmaceutical composition for use according to any one of claims 57 to 59, wherein the subject is a human.

61. 61. The vaccine or pharmaceutical composition for use according to claim 60, wherein the subject is pregnant.

62. 61. The vaccine or pharmaceutical composition for use according to claim 60, wherein the subject is 65 years of age or older.

63. 63. The vaccine or pharmaceutical composition for use according to claim 62, wherein the subject is 70 years of age or older.

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