iRNA COMPOSITION AND METHOD OF USING SAME
A dsRNA agent targeting Complement CFB expression through specific nucleotide sequences and delivery vectors effectively inhibits CFB gene activity, addressing the limitations of current treatments for complement pathway-related diseases.
Patent Information
- Application Number
- PCT/CN2025/100466
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-06-05
- Filing Date
- 2025-06-11
- Publication Date
- 2026-01-15
AI Technical Summary
Current treatments for diseases associated with complement pathway activation or dysregulation, such as IgA nephropathy, paroxysmal nocturnal hemoglobinuria (PNH), and rheumatoid arthritis, are limited, and there is a need for innovative strategies to inhibit or silence Complement CFB for broader therapeutic use.
Development of a double-stranded ribonucleic acid (dsRNA) agent that targets and inhibits Complement CFB expression by forming a sense and antisense strand with specific nucleotide sequences, optionally modified, and is delivered via vectors like GalNAc conjugates to inhibit CFB gene expression in cells.
The dsRNA agent effectively reduces CFB expression by at least 40-95% in animals and cells, providing a therapeutic approach for CFB-associated conditions like PNH, C3 glomerulopathy, IgA nephropathy, and atypical hemolytic uremic syndrome.
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Abstract
Description
iRNA COMPOSITION AND METHOD OF USING SAME
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims priority to PCT / CN2024 / 098634, titled "iRNA COMPOSITION AND METHOD OF USING SAME" , filed on June 12, 2024, and 202510747814. X, titled "iRNA COMPOSITION AND METHOD OF USING SAME" , filed on June 5, 2025, the entire contents of which are hereby incorporated by reference.TECHNICAL FIELD
[0003] The present disclosure relates to RNA interference (RNAi) agents for inhibiting Complement CFB, such as double-stranded RNAi agents, pharmaceutical compositions comprising the Complement CFB RNAi agents, and methods of using same.BACKGROUND
[0004] The complement system comprises more than 50 soluble or membrane-bound glycoproteins that engage in multi-tiered protein-protein interactions, resulting in formation and activation of enzymatic complexes and generation of bioactive fragments. When functioning normally under a finely regulated fashion, this cascade of proteolytic reactions contributes to a central part of innate immunity that opsonize pathogens and induces a series of inflammatory responses to fight infection and maintain homeostasis. However, when complement is over activated, it can lead to systemic inflammation, cellular injury, tissue damage and pathogenesis of many diseases. Inhibition or modulation of complement pathway activity has been recognized as a promising therapeutic strategy. As available complement-targeting treatment options are limited, developing innovative strategies to treat diseases associated with complement pathway activation or dysregulation is a significant unmet need.
[0005] Complement factor B is part of the alternative pathway of complement activation. It circulates in the blood as a single chain polypeptide. Upon activation of the alternative pathway, Factor D cleaves factor B releasing the non-catalytic chain Ba to generate the active proteolytic enzyme Bb. Bb combines with complement factor 3b to generate C3 or C5 convertase. CFB is associated with diseases such as IgA nephropathy, paroxysmal nocturnal hemoglobinuria (PNH) , and rheumatoid arthritis.
[0006] Currently, there is a CFB targeting small molecule, FABHALTA, approved for paroxysmal nocturnal hemoglobinuria (PNH) and there is a need of compositions and methods to inhibit or silence CFB for broader therapeutics use in diseases associated with activated or dysregulated alternative complement pathway.SUMMARY
[0007] The present disclosure provides an iRNA composition that causes cleavage of the RNA transcript of the Complement CFB gene mediated by an RNA-induced silencing complex (RISC) . The Complement CFB can be located within a cell, such as a cell of a subject, such as a human subject.
[0008] The present disclosure relates to a double-stranded ribonucleic acid (dsRNA) agent that inhibits the expression of Complement CFB, wherein the dsRNA agent comprises a sense strand and an antisense strand, the sense strand being as follows: 5’-Q1-X-Q2-3’, wherein Q1 and Q2 are 0, 1 or 2 nucleotide sequences selected from A, U, T, C, and G nucleotide motifs; X is a sequence containing positions 1 to n1 of the sense strand sequence as shown in Table 1-1 or Table 1-3, and n1 is position 18 or 19; the antisense strand being as follows: 5’-Q3-Y-Q4-3’, wherein Q3 and Q4 are 0, 1 or 2 nucleotide sequences selected from A, U, T, C, and G nucleotide motifs; Y is a sequence containing positions n2 to n3 of the antisense strand sequence as shown in Table 1-1 or Table 1-3, n2 is position 1 or 2, and n3 is position 18, 19, 20 or 21.
[0009] The present disclosure further relates to a double-stranded ribonucleic acid (dsRNA) agent that inhibits the expression of Complement CFB, wherein the dsRNA agent comprises a sense strand and an antisense strand, the nucleotides in the antisense strand contain a region complementary to the transcript of Complement CFB, and the complementary region contains at least 15, at least 16, at least 17, at least 18, or at least 19 consecutive nucleotides that differ by 0, 1, 2, or 3 nucleotides from the nucleotide sequences of any one of the antisense stands listed in Table 1-1 or Table 1-3. The dsRNA agent comprises at least one modified nucleotide, or all or substantially all nucleotides in the antisense strand are modified nucleotides.
[0010] The present disclosure further relates to a dsRNA agent, which comprises a sense strand and an antisense strand, wherein the sense strand comprises a nucleotide sequence X, the antisense strand comprises a nucleotide sequence Y, the nucleotide sequence X and the nucleotide sequence Y are at least partially reverse-complementary to form a double-stranded region; and, each nucleotide in the sense strand and the antisense strand is independently a fluorinated modified nucleotide or a non-fluorinated modified nucleotide; and, the dsRNA targets and inhibits complement CFB (CFB) .
[0011] In a specific embodiment, the fluorinated modified nucleotide is located in the nucleotide sequence X and the nucleotide sequence Y; and, from the 5' end to the 3' end, in the sense strand, the nucleotides at positions 7, 9, 10, 14 and 15 of the nucleotide sequence X are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the sense strand are non-fluorinated modified nucleotides; from the 5' end to the 3' end, in the antisense strand, the nucleotides at positions 2, 4, 7, and 14 of the nucleotide sequence Y are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the antisense strand are non-fluorinated modified nucleotides.
[0012] In a specific embodiment, the fluorinated modified nucleotide is located in the nucleotide sequence X and the nucleotide sequence Y; and, from the 5' end to the 3' end, in the sense strand, the nucleotides at positions 7, 9, 10, 14 and 15 of the nucleotide sequence X are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the sense strand are non-fluorinated modified nucleotides; from the 5' end to the 3' end, in the antisense strand, the nucleotides at positions 2, 3, 5, 7, and 14 of the nucleotide sequence Y are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the antisense strand are non-fluorinated modified nucleotides.
[0013] The present disclosure further relates to a dsRNA agent, wherein the at least one modified nucleotide includes: 2'-O-methyl nucleotide, 2'-fluoro nucleotide, 2'-deoxynucleotide, locked nucleic acid, unlocked nucleic acid (UNA) , glycol nucleic acid (GNA) , 2'-F-arabinose nucleotide, 2'-methoxyethyl nucleotide, abasic nucleotides, ribitol, reverse nucleotides, reverse abasic nucleotides, reverse 2'-OMe nucleotide, reverse 2'-deoxynucleotide, 2'-amino modified nucleotide, 2'-alkyl modified nucleotide, morpholino nucleotide and 3'-OMe nucleotide, nucleotides containing a 5'-phosphorothioate group, or terminal nucleotides linked to cholesterol derivatives or dodecanoate bisdecylamide groups, 2'-amino modified nucleotides, phosphoramidates, or unnatural bases containing nucleotides. Preferably, the dsRNA agent further comprises E-vinylphosphonate nucleotide at the 5' end of the sense strand and / or antisense strand; or comprises at least one phosphorothioate internucleoside linkage in the sense strand and / or antisense strand.
[0014] In a specific embodiment, the length of the double-stranded region of the dsRNA agent is selected from 19 to 30 nucleotide pairs, or 19 to 25 nucleotide pairs, or 19 to 21 nucleotide pairs, or 19 to 23 nucleotide pairs, or 21 to 23 nucleotide pairs; or the length of each strand independently does not exceed 30 nucleotides; or the length of each strand independently does not exceed 25 nucleotides; or the length of each strand independently does not exceed 21 nucleotides. In a specific embodiment, the length of the sense strand does not exceed 19, 20 or 21 nucleotides, the length of the antisense strand does not exceed 21, 22 or 23 nucleotides.
[0015] In a specific embodiment, the dsRNA agent has two blunt ends; or at least one strand thereof contains a 3’ overhang of at least 1 nucleotide; or at least one strand thereof contains 3’ overhangs of at least 2 nucleotides.
[0016] In a specific embodiment, the dsRNA agent further comprises a ligand. Since RNA cannot directly penetrate the cell membrane, a vector is required to carry the nucleic acid drug to the cytoplasm of the target cell in the target organ. Any vector that can bring the nucleic acid drug of the present disclosure into the cytoplasm is suitable for the present disclosure. Vectors and methods known in the art include, but are not limited to: GalNac vectors, viral delivery (retrovirus, adenovirus, lentivirus, baculovirus, AAV) , liposomal nanoparticles LNP, polymeric carriers, cell-penetrating peptide vectors, bacterial delivery (tkRNAi) , direct chemical modification of siRNAs to increase stability, etc., and the use of vectors is not limited. Those skilled in the art should understand that displacements and mutations can be made on the basis of the core sequence of the present disclosure, which can achieve the active effects of the present disclosure, or even better effects; therefore, as long as the core sequence X of the present disclosure is used, the nucleic acid drugs in which displacements and mutations are made on the basis of the core sequence X of the present disclosure, are within the scope of protection of the present disclosure; or nucleic acid drugs that only differ from the sequence of the present disclosure by 0, 1, 2, or 3 nucleotides are also within the scope of protection of the present disclosure.
[0017] In an embodiment, a conjugate comprising ligand, preferably, the ligand is conjugated to the sense strand, preferably, the ligand is an N-acetylgalactosamine (GalNAc) derivative, and more preferably, the ligand is one or more GalNAc derivatives attached via a monovalent, divalent, trivalent or tetravalent branched linker. In an embodiment, a dsRNA-GalNAc conjugate comprising GalNAc, GalNAc designated as L96.
[0018] A method for preparing dsRNA-GalNAc conjugates, comprising the following steps: preparing a ligand-containing carrier, synthesizing a sense strand, synthesizing an antisense strand using a universal carrier, annealing the sense strand and the antisense strand to form the dsRNA-GalNAc conjugate.
[0019] In an embodiment, the expression of CFB was reduced by at least 40%, 50%, 60%, 70%in animals.
[0020] The present disclosure relates to a pharmaceutical composition for inhibiting the expression of a gene encoding Complement CFB. Optionally, the pharmaceutical composition may also comprise a pharmaceutically acceptable carrier, a buffer solution, a non-buffer solution, or an additional therapeutic agent. Alternatively, the composition is packaged in a kit, a container, a wrapper, a dispenser, a prefilled syringe or a vial.
[0021] In one specific embodiment, the pharmaceutical composition may be formulated for subcutaneous administration or may be formulated for intravenous (IV) administration.
[0022] In one specific embodiment, the pharmaceutical composition further comprises physiological saline, and may additionally comprise a pH adjusting agent such as sodium hydroxide, sodium dihydrogen phosphate, disodium hydrogen phosphate, and the like.
[0023] The present disclosure relates to a cell comprising the dsRNA agent, and preferably, the cell is a mammalian cell, optionally a human cell.
[0024] The present disclosure relates to a conjugate comprising the dsRNA or the pharmaceutical composition according to the present disclosure.
[0025] The present disclosure relates to a method for inhibiting the expression of Complement CFB gene, the method comprising contacting the cell with the dsRNA agent or the pharmaceutical composition of the present disclosure, thereby inhibiting the expression of the Complement CFB gene in the cell.
[0026] The present disclosure relates to a method or a use for treating or preventing a subject suffering from a condition that would benefit from reduced expression of Complement CFB, the method comprising contacting the cell with the dsRNA agent or the pharmaceutical composition of the present disclosure, thereby inhibiting the expression of the Complement CFB gene in the cell.
[0027] In one specific embodiment, the cell is in the body of a subject, and preferably, the subject is a human; and / or the subject suffers from Complement CFB-associated condition; and / or the cell is in the body of a subject and the dsRNA agent is administered subcutaneously to the subject; and / or the cell is in the body of a subject and the dsRNA is administered subcutaneously or intravenously (IV) to the subject; and / or contacting the cell with the dsRNA agent inhibits the expression of Complement CFB by at least 50%, 60%, 70%, 80%, 90%or 95%.
[0028] The use of the dsRNA agent or the pharmaceutical composition in the manufacture of a medicament for treating a CFB-related disease in combination with an additional therapeutic agent.
[0029] In one specific embodiment, the condition is a Complement CFB-associated disease, including but not limited to paroxysmal nocturnal hemoglobinuria (PNH) , C3 glomerulopathy (C3G) , immunoglobulin A nephropathy (IgAN) , membranous nephropathy (MN) and atypical hemolytic uremic syndrome (aHUS) .
[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0031] Terms
[0032] All publications, patents and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent or patent application is specifically and individually indicated to be incorporated by reference.
[0033] Before the present disclosure is described in detail below, it is to be understood that the present disclosure is not limited to the specific methodologies, embodiments and agents described herein, as these may vary. It is also to be understood that the terms used herein are merely for description of specific embodiments, and are not intended to limit the scope of the present disclosure. Unless defined otherwise, all the technical and scientific terms used herein have the same meanings as commonly understood by those of ordinary skill in the art to which the present disclosure pertains.
[0034] The articles "a" and "an" are used herein to refer to one or to more than one (i.e., to at least one) of the grammatical object of the article. By way of example, "an element" means one element or more than one element, e.g., a plurality of elements.
[0035] The term "or" is used herein to mean, and is used interchangeably with, the term "and / or, " unless context clearly indicates otherwise.
[0036] Certain embodiments disclosed herein include numerical ranges, and certain aspects of the present disclosure may be described in terms of ranges. Unless stated otherwise, it should be understood that numerical ranges or descriptions in terms of ranges are merely for the purposes of conciseness and convenience and should not be considered to strictly limit the scope of the present disclosure. Accordingly, descriptions in terms of ranges should be considered to specifically disclose all possible subranges and all possible specific numerical points within such ranges, as if such subranges and numerical points are expressly written herein. For example, description of a range from 1 to 6 should be considered to specifically disclose subranges from 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, etc., as well as specific numerical points within such ranges, such as 1, 2, 3, 4, 5, and 6. The above principles apply equally regardless of whether the numerical range stated is broad or narrow. When described in terms of a range, the range includes the endpoints of the range.
[0037] When referring to measurable values such as amounts and temporary durations, the term “about” is meant to include a variation of ±20%, or in some cases ±10%, or in some cases ±5%, or in some cases ±1%, or in some cases ±0.1%, of the specified value.
[0038] As used herein, “target sequence” refers to the contiguous portion of the nucleotide sequence of the mRNA molecule formed during the transcription of Complement CFB gene, including mRNA that is the primary transcription product and the product of RNA processing. The target portion of the sequence is at least long enough to serve as a substrate for iRNA-directed cleavage at or near the nucleotide sequence portion of the mRNA molecule formed during the transcription of the Complement CFB gene. In one embodiment, the target sequence is within the protein coding region of Complement CFB. The target sequence may be about 18 to 35 nucleotides in length, for example about 18 to 30 nucleotides in length. For example, the target sequence may be about 19 to 30 nucleotides, 19 to 29, 19 to 28, 19 to 27, 19 to 26, 19 to 25, 19 to 24, 19 to 23, 19 to 22, 19 to 21, 19 to 20, 20 to 30, 20 to 29, 20 to 28, 20 to 27, 20 to 26, 20 to 25, 20 to 24, 20 to 23, 20 to 22, 20 to 21, 21 to 30, 21 to 29, 21 to 28, 21 to 27, 21 to 26, 21 to 25, 21 to 24, 21 to 23 or 21 to 22 nucleotides in length. In some embodiments, the target sequence is about 19 to about 30 nucleotides in length. In other embodiments, the target sequence is about 19 to about 25 nucleotides in length. In other embodiments, the target sequence is about 19 to about 23 nucleotides in length. In some embodiments, the target sequence is about 19 to about 21 nucleotides in length. Ranges and lengths between those listed above are also considered as a part of the present disclosure. As used interchangeably herein, the terms “iRNA” , “RNAi agent” , “iRNA agent” , and “RNA interference agent” refer to an agent containing RNA as the term is defined herein, which mediates targeted cleavage of RNA transcripts through the RNA-induced silencing complex (RISC) pathway. iRNA directs the sequence-specific degradation of mRNA through a process called RNA interference (RNAi) . For example, “iRNA” used in the compositions, uses, and methods of the present disclosure may be double-stranded RNA, and is referred to herein as “double-stranded RNA agent” , “double-stranded RNA (dsRNA) molecule” , “dsRNA agent” or “dsRNA” . The term “dsRNA” refers to a complex of ribonucleic acid molecules having a duplex structure containing two antiparallel and substantially complementary nucleic acid strands, which have a “sense” orientation and an “antisense” orientation relative to the target RNA.
[0039] As used herein, the term "nucleotide overhang" refers to at least one unpaired nucleotide that protrudes from the duplex structure of an iRNA, e.g., a dsRNA. For example, when a 3'-end of one strand of a dsRNA extends beyond the 5'-end of the other strand, or vice versa, there is a nucleotide overhang. A dsRNA can comprise an overhang of at least one nucleotide; alternatively, the overhang can comprise at least two nucleotides, at least three nucleotides, at least four nucleotides, at least five nucleotides or more. A nucleotide overhang can comprise or consist of a nucleotide / nucleoside analog, including a deoxynucleotide / nucleoside. The overhang (s) can be on the sense strand, the antisense strand or any combination thereof. Furthermore, the nucleotide (s) of an overhang can be present on the 5'-end, 3'-end or both ends of either an antisense or sense strand of a dsRNA.
[0040] In one embodiment, the antisense strand of a dsRNA has a 1-10 nucleotide, e.g., a 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 nucleotide, overhang at the 3'-end and / or the 5'-end. In one embodiment, the sense strand of a dsRNA has a 1-10 nucleotide (s) , e.g., a 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 nucleotide (s) , overhang at the 3 '-end and / or the 5 '-end. In another embodiment, one or more of the nucleotides in the overhang is replaced with a nucleoside thiophosphate.
[0041] "Blunt" or "blunt end" means that there are no unpaired nucleotides at that end of the double stranded RNAi agent, i.e., no nucleotide overhang. A "blunt ended" RNAi agent is a dsRNA that is double-stranded over its entire length, i.e., no nucleotide overhang at either end of the molecule. The RNAi agents of the invention include RNAi agents with nucleotide overhangs at one end (i.e., agents with one overhang and one blunt end) or with nucleotide overhangs at both ends.
[0042] The term "antisense strand" or "guide strand" refers to the strand of an iRNA, e.g., a dsRNA, which includes a region that is substantially complementary to a target sequence, e.g., a CFB mRNA. As used herein, the term "region of complementarity" refers to the region on the antisense strand that is substantially complementary to a sequence, for example a target sequence, e.g., an CFB nucleotide sequence, as defined herein. Where the region of complementarity is not fully complementary to the target sequence, the mismatches can be in the internal or terminal regions of the molecule. Generally, the most tolerated mismatches are in the terminal regions, e.g., within 5, 4, 3, 2, or 1 nucleotide (s) of the 5'-and / or 3'-terminus of the iRNA. In one embodiment, a double-stranded RNAi agent of the invention include a nucleotide mismatch in the antisense strand. In another embodiment, a double-stranded RNAi agent of the invention include a nucleotide mismatch in the sense strand. In one embodiment, the nucleotide mismatch is, for example, within 5, 4, 3, 2, or 1 nucleotide (s) from the 3 '-terminus of the iRNA. In another embodiment, the nucleotide mismatch is, for example, in the 3 '-terminal nucleotide of the iRNA.
[0043] The term "sense strand, " or "passenger strand" as used herein, refers to the strand of an iRNA that includes a region that is substantially complementary to a region of the antisense strand as that term is defined herein.
[0044] The terms “silencing” , “reducing” , “inhibiting” , “suppressing” or “down-regulating” and other similar terms are used interchangeably and include any level of inhibition.
[0045] The term “Complement CFB” is used interchangeably with the term “CFB” and refers to a polypeptide involves in alternative pathway of complement activation. The term"CFB, " as used herein, also refers to naturally occurring DNA sequence variations of the CFB genome.
[0046] The term “sequence-containing strand” refers to an oligonucleotide containing a strand of nucleotides, described by reference to the sequence using standard nucleotide nomenclature.
[0047] Generally, “G” , “C” , “A” , “T” and “U” each respectively represent nucleotides containing guanine, cytosine, adenine, thymine and uracil as bases. However, it should be understood that the term “ribonucleotide” or “nucleotide” may also refer to modified nucleotides. It is well known to those skilled in the art that guanine, cytosine, adenine and uracil can be replaced by other moieties without substantially altering the base pairing properties of the oligonucleotides containing the nucleotides bearing such replaced moieties. For example, without limitation, a nucleotide containing inosine as its base may base-pair with a nucleotide containing adenine, cytosine, or guanine. Therefore, a nucleotide containing uracil, guanine or adenine in the nucleotide sequence of the dsRNA characterized by the present disclosure can be replaced with a nucleotide containing, for example, inosine. In another example, adenine and cytosine at any position in the oligonucleotide can be replaced with guanine and uracil, respectively, to form G-U wobble base pair with the target mRNA. Sequences containing such replaced moieties are suitable for use in the compositions and methods characterized by the present disclosure.
[0048] The terms “sequence” and “nucleotide sequence” refer to contiguous or sequential nucleobases or nucleotides, described by consecutive letters using standard nomenclature. Nucleic acid molecules may contain unmodified and / or modified nucleotides. Nucleotide sequences may contain unmodified and / or modified nucleotides.
[0049] The terms “base” , “nucleotide base” or “nucleobase” refers to a heterocyclic pyrimidine or purine compound that is a component of a nucleotide, and includes the primary purine bases adenine and guanine, and the primary pyrimidine bases cytosine, thymine and uracil. Nucleobases can be further modified to include, without limitation, universal bases, hydrophobic bases, promiscuous bases, size-expanded bases, and fluorinated bases. The synthesis of such modified nucleobases, including phosphoramidite compounds containing modified nucleobases, is known in the art.
[0050] The term “nucleotide” has the same meaning as commonly understood in the art. Thus, the term “nucleotide” as used herein refers to a glycoside containing a sugar moiety, a base moiety and a covalent linking group (linker) such as a phosphate or phosphorothioate internucleoside linking group, and encompasses naturally occurring nucleotides such as DNA or RNA, and non-naturally occurring nucleotides containing modified sugar and / or base moieties, which are also referred to herein as nucleotide analogs. Herein, a single nucleotide may be referred to as a monomer or unit.
[0051] As used herein, unless stated otherwise, the term “complementary” when used to describe a first nucleobase or nucleotide sequence (e.g., RNAi agent sense strand or targeted mRNA) in relation to a second nucleobase or nucleotide sequence (e.g., RNAi agent antisense strand or single-stranded antisense oligonucleotide) , means the ability of an oligonucleotide or polynucleotide containing a first nucleotide sequence to hybridize (form base pair hydrogen bonds) under mammalian physiological conditions (or other suitable in vivo or in vitro conditions) and form a duplex or double helical structure under certain standard conditions with an oligonucleotide containing a second nucleotide sequence. Those of ordinary skill in the art will be able to select the set of conditions most suitable for a hybridization test. Complementary sequences include Watson-Crick base pairs or non-Watson-Crick base pairs, and include natural or modified nucleotides or nucleotide mimics, at least to the extent that the above hybridization requirements are met. Sequence identity or complementarity is independent of modifications. For example, a and Af as defined herein are complementary to U (or T) and identical to A for purposes of determining identity or complementarity.
[0052] As used herein, “perfectly complementary” or “fully complementary” means that in a hybridized pair of nucleobase or nucleotide sequence molecules, all (100%) the bases in a contiguous sequence of a first oligonucleotide will hybridize with the same number of bases in a contiguous sequence of a second oligonucleotide. The contiguous sequence can comprise all or part of the first or second nucleotide sequence. However, where a first sequence is referred to as "substantially complementary" with respect to a second sequence herein, the two sequences can be fully complementary, or they can form one or more, but generally not more than 5, 4, 3 or 2 mismatched base pairs upon hybridization for a duplex up to 30 base pairs, while retaining the ability to hybridize under the conditions most relevant to their ultimate application, e.g., inhibition of gene expression via a RISC pathway. However, where two oligonucleotides are designed to form, upon hybridization, one or more single stranded overhangs, such overhangs shall not be regarded as mismatches with regard to the determination of complementarity. For example, a dsRNA comprising one oligonucleotide 21 nucleotides in length and another oligonucleotide 23 nucleotides in length, wherein the longer oligonucleotide comprises a sequence of 21 nucleotides that is fully complementary to the shorter oligonucleotide, can yet be referred to as "fully complementary" for the purposes described herein.
[0053] The terms "complementary, " "fully complementary" and "substantially complementary" herein can be used with respect to the base matching between the sense strand and the antisense strand of a dsRNA, or between the antisense strand of an iRNA agent and a target sequence, as will be understood from the context of their use.
[0054] As used herein, a polynucleotide that is "substantially complementary to at least part of a messenger RNA (mRNA) refers to a polynucleotide that is substantially complementary to a contiguous portion of the mRNA of interest (e.g., an mRNA encoding an CFB gene) . For example, a polynucleotide is complementary to at least a part of an CFB mRNA if the sequence is substantially complementary to a non-interrupted portion of an mRNA encoding an CFB gene.
[0055] As used herein, the terms “link” or “conjugate” when referring to the linkage between two compounds or molecules, means that the two compounds or molecules are linked by a covalent bond. Unless stated otherwise, the terms “link” and “conjugate” as used herein may refer to the linkage between a first compound and a second compound, with or without any intervening atoms or atomic groups.
[0056] The terms “individual” or “subject” as used herein refers to any animal, such as a mammal or marsupial. Individuals contemplated by the present disclosure include, but are not limited to, humans, non-human primates (such as cynomolgus or rhesus monkeys or other types of macaques) , mice, pigs, horses, donkeys, cattle, sheep, rats, and poultry of any kind.
[0057] The term “disease” or “condition” or “disorder” or the like as used herein refers to any change or imbalance that impairs or interferes with the normal function of cells, tissues or organs. For example, the “disease” includes, but is not limited to, tumors, pathogenic infections, autoimmune diseases, T cell dysfunctions, or immune tolerance deficiency (such as transplantation rejection) .
[0058] The term “treatment” as used herein refers to clinical intervention in an attempt to modify the course of a disease in an individual or to treat a cell-induced disease process, either prophylactically or interventionally in the clinical pathological process. Therapeutic effects include, but are not limited to, preventing the occurrence or recurrence of the disease, alleviating symptoms, reducing the direct or indirect pathological consequences of any disease, preventing metastasis, slowing down the progression of the disease, improving or alleviating the condition, alleviating or improving the prognosis, etc.
[0059] In general, the majority of nucleotides of each strand of a dsRNA molecule are ribonucleotides, but as described in detail herein, each or both strands can also include one or more non-ribonucleotides, e.g., a deoxyribonucleotide and / or a modified nucleotide. In addition, as used in this specification, an "RNAi agent" may include ribonucleotides with chemical modifications; an RNAi agent may include substantial modifications at multiple nucleotides. As used herein, the term "modified nucleotide" refers to a nucleotide having, independently, a modified sugar moiety, a modified internucleotide linkage, and / or modified nucleobase. Thus, the term modified nucleotide encompasses substitutions, additions or removal of, e.g., a functional group or atom, to internucleoside linkages, sugar moieties, or nucleobases. The modifications suitable for use in the agents of the invention include all types of modifications disclosed herein or known in the art. Any such modifications, as used in a siRNA type molecule, are encompassed by "RNAi agent" for the purposes of this specification and claims.
[0060] Another modification of the RNA of an iRNA of the invention involves chemically linking to the RNA one or more ligands, moieties or conjugates that enhance the activity, cellular distribution or cellular uptake of the iRNA. Such moieties include but are not limited to lipid moieties such as a cholesterol moiety, cholic acid, a thioether, e.g., beryl-S-tritylthiol, a thiocholesterol, an aliphatic chain, e.g., dodecandiol or undecyl residues, a phospholipid, e.g., di-hexadecyl-rac-glycerol or triethyl-ammonium 1, 2-di-O-hexadecyl-rac-glycero-3-phosphonate, a polyamine or a polyethylene glycol chain, or adamantane acetic acid, a palmityl moiety, or an octadecylamine or hexylamino-carbonyloxycholesterol moiety.
[0061] In one embodiment, a ligand alters the distribution, targeting or lifetime of an iRNA agent into which it is incorporated. In preferred embodiments a ligand provides an enhanced affinity for a selected target, e.g., molecule, cell or cell type, compartment, e.g., a cellular or organ compartment, tissue, organ or region of the body, as, e.g., compared to a species absent such a ligand. Preferred ligands will not take part in duplex pairing in a duplexed nucleic acid. Representative patents for the preparation of RNA conjugates herein include (but are not limited to) CN108064294B paragraph
[0635] -
[0714] .
[0062] The nucleic acids featured in the invention can be synthesized and / or modified by methods well established in the art, such as those described in "Current protocols in nucleic acid chemistry, "Beaucage, S.L. et al. (Edrs. ) , John Wiley &Sons, Inc., New York, NY, USA, which is hereby incorporated herein by reference. Modifications include, for example, end modifications, e.g., 5 '-end modifications (phosphorylation, conjugation, inverted linkages) or 3 '-end modifications (conjugation, DNA nucleotides, inverted linkages, etc. ) ; base modifications, e.g., replacement with stabilizing bases, destabilizing bases, or bases that base pair with an expanded repertoire of partners, removal of bases (abasic nucleotides) , or conjugated bases; sugar modifications {e.g., at the 2'-position or 4'-position) or replacement of the sugar; and / or backbone modifications, including modification or replacement of the phosphodiester linkages. Specific examples of iRNA compounds useful in the embodiments described herein include, but are not limited to RNAs containing modified backbones or no natural internucleoside linkages. RNAs having modified backbones include, among others, those that do not have a phosphorus atom in the backbone. For the purposes of this specification, and as sometimes referenced in the art, modified RNAs that do not have a phosphorus atom in their internucleoside backbone can also be considered to be oligonucleosides. In some embodiments, a modified iRNA will have a phosphorus atom in its internucleoside backbone.Examples
[0063] The present disclosure is further described below in conjunction with specific examples. It should be understood that these examples serve only to illustrate the present disclosure and are not limiting the scope of the present disclosure. The experimental methods in which no specific conditions are specified in the following examples are usually performed according to conventional conditions such as those described in J. Sambrook et al., Molecular Cloning, A Laboratory Manual, 3rd edition, Science Press, 2002, or according to the conditions recommended by the manufacturer.
[0064] Example 1 Design and synthesis of oligonucleotide sequences
[0065] Test 1 Design of siRNA
[0066] An antisense strand was used to target a specific location of Complement CFB (CFB) gene (NCBI GeneID: 629, NM_001710.6) , wherein, starting from the nucleic acid at the 5’ end, there were 21 bases that were complementary to and paired with the target gene.
[0067] A detailed list of unmodified CFB sense strand and antisense strand nucleotide sequences is as shown in Table 1-1.
[0068] Table 1-1 Unmodified CFB sense strand and antisense strand nucleotide sequences
[0069] Table 1-2 shows the abbreviations for one or more nucleotides in the nucleic acid sequence listing. It can be understood that these monomers are linked to each other via 5’-3’-phosphodiester bonds when they are present in oligonucleotides.
[0070] Table 1-2 List of abbreviations
[0071] A detailed list of modified CFB sense strand and antisense strand nucleotide sequences is as shown in Table 1-3.
[0072] [Rule 91,30.10.2025]A detailed list of modified CFB sense strand and antisense strand nucleotide sequences is as shown in Table 1-3.Table 1-3 Modified CFB sense strand and antisense strand nucleotide sequences
[0073] Test 2 Synthesis of siRNA
[0074] The synthesis of siRNA was the same as the usual solid-phase synthesis of phosphoramidite. On a synthesizer, nucleoside phosphoramidite monomers were linked one by one according to the synthesis procedure, starting from a universal CPG carrier. 5- (Ethylthio) -1H-tetrazole (ETT) was used as an activator (0.6 M acetonitrile solution) , 0.22 M PADS was dissolved in a 1: 1 (volume ratio) solution of acetonitrile and trimethylpyridine as a vulcanizing agent, and an iodopyridine / aqueous solution was used as an oxidant. After the completion of solid-phase synthesis, the oligonucleotides were cleaved from the solid support, and soaked in a 3: 1 solution of 28%ammonia water and ethanol at 50 ℃ for 16 h. Centrifugation was then performed. The supernatant was transferred to another centrifugal tube. After the completion of concentration and evaporation to dryness, purification was performed using C18 reversed-phase chromatography, wherein the mobile phase was 0.1 M TEAA and acetonitrile. DMTr was removed using a 3%trifluoroacetic acid solution. The target oligonucleotide was collected and then lyophilized, identified as the target product by LC-MS, and quantified by UV (260 nm) .
[0075] The obtained single-stranded oligonucleotides were annealed according to the complementary pairing in the equimolar ratio to finally obtain the double-stranded siRNAs as shown in Table 1-3. The double-stranded siRNA was dissolved in 1 ×PBS and adjusted to the concentration required for the experiment.
[0076] Test 3 Synthesis of siRNA conjugate
[0077] L96 was linked at the 3’ end of a sense strand. The specific operations are as follows: L96 was linked to a resin, and starting from the resin, nucleoside monomers were linked one by one in the 3’-5’ direction according to a nucleotide arrangement sequence. Each linking of a nucleoside monomer involved a four-step reaction of deprotection, coupling, capping, and oxidation or vulcanization, which were conventional operations in the art, see section “Synthesis of siRNA” for details. The GalNAc (L96) -conjugated siRNA conjugates targeting CFB were obtained.
[0078] It should be noted that L96 was provided as an exemplary ligand. On the basis of known ligand-related technologies in the art, those skilled in the art can also choose other ligands other than L96 to be conjugated with the modified siRNAs in Table 1-3 as long as the ligands have properties similar to those of L96 that can promote the delivery of an iRNA preparation to the liver.
[0079] Example 2 Screening of siRNA conjugates in Mice Expressing Human CFB cDNA (HDI mice)
[0080] A subset of siRNA conjugates candidates was screened in mice expressing human CFB cDNA. CD-1 mice were transfected with vectors expressing the human CFB cDNA 3 days after administration with a single subcutaneous dose of selected compounds at 2 mg / kg, n=5. Animals were sacrificed 18h later after vector HDI injection for evaluation of human CFB mRNA levels in liver tissue samples by RT-qPCR.
[0081] In brief, liver tissues were lysed and homogenized by TissueLyser III (Qiagen, 9003240) . RNA was extracted by KingFisher Apex purification systems (ThermoFisher, 5400930) using MagMAXTM mirVanaTM Total RNA isolation kit (Applied Biosystems, A27828) . TaqMan FastTM Virus 1-Step Master Mix (Applied Biosystems, 4444434) , human CFB and NeoR taqman probes were used for RT-qPCR to quantify CFB mRNA expression.
[0082] Normalization was performed on the basis of the results of the PBS group, the relative expression of the target gene was represented by 2-ΔΔCT, and the calculation formula was as follows:
[0083] ΔCT = average Ct value of target gene (CFB) -average Ct value of reference gene (NeoR) ;
[0084] ΔΔCT=ΔCT (administration group) -ΔCT (PBS control group) ;
[0085] Relative expression of mRNA = 2-ΔΔCT, and the results were as shown in Table 2-1.
[0086] Compounds that showed at least 65%knockdown were selected for dose response follow up study.
[0087] Table 2-1 Inhibitory activity of siRNAs in HDI mice
[0088] [Rule 91,30.10.2025]The same subset of siRNA conjugates candidates was screened using in vitro cell-based assays. In brief, Hep3B human liver cells expressing endogenous CFB were transfected with siRNA at 400pM and 10pM. Cells were incubated for 48h following transfection, and then levels of CFB mRNA from the transfected cells were determined using TAQMAN-based qPCR assays. Compounds that achieved at least 65%growth inhibition were selected for in vivo dose response study, and the results were as shown in Table 2-2.
[0089] Table 2-2 Percentage inhibition achieved by siRNAs in Hep3B cells
[0090] CFB hit compounds identified from in HDI and in vitro screening were selected for dose response study at 1, 2 and 4mg / kg in HDI mice, n=4. CD-1 mice were transfected with vectors expressing the human CFB cDNA 3 days after dosing with siRNA conjugates subcutaneously and liver tissues were collected 18h after vector HDI injection for CFB mRNA level expression evaluation by RT-qPCR. The detection method is as described above, and the results were as shown in Table 2-3.
[0091] Table 2-3 Inhibitory activity of siRNAs in HDI mice
[0092] Sequences that achieved high CFB knockdown were applied with chemical modifications for optimization and tested with HDI mice at 2mg / kg, n=4. CD-1 mice were transfected with vectors expressing the human CFB cDNA 3 days after dosing with siRNA conjugates subcutaneously and liver tissues were collected 18h after vector HDI injection for CFB mRNA level expression evaluation by RT-qPCR. The detection method is as described above, and the results were as shown in Table 2-4.
[0093] Table 2-4 Inhibitory activity of siRNAs in HDI mice
[0094] Example 3 Screening of siRNA conjugates in humanized CFB Mice
[0095] According to the results in Example 2, another subset of siRNA conjugates was tested in humanized CFB mice at 1 and 2mg / kg doses, n=4. hCFB mice were dosed subcutaneously and liver tissue samples were collected 14 days post dose for CFB mRNA expression evaluation by RT-qPCR and protein expression evaluation by ELISA of D14 serum samples, and the results were as shown in Table 3-1.
[0096] Table 3-1 Inhibitory activity of siRNAs in humanized CFB mice (D14)
[0097] Same subset of siRNA conjugates was tested in humanized CFB mice at 1 and 2mg / kg doses, n=4. hCFB mice were dosed subcutaneously and liver tissue samples were collected 42 days post dose for CFB mRNA expression evaluation by RT-qPCR and protein expression evaluation by ELISA of D42 serum samples, and the results were as shown in Table 3-2.
[0098] Table 3-2 Inhibitory activity of siRNAs in humanized CFB mice (D42)
[0099] Same subset of siRNA conjugates was tested in humanized CFB mice at 1 and 2mg / kg doses, n=4. hCFB mice were dosed subcutaneously and serum samples were collected weekly post dose to 70 days post dose for CFB protein expression evaluation by ELISA, and the results were as shown in Table 3-3.
[0100] Table 3-3 Inhibitory activity of siRNAs in humanized CFB mice
[0101] Table 3-3 Inhibitory activity of siRNAs in humanized CFB mice (Continuted)
[0102] Table 3-3 Inhibitory activity of siRNAs in humanized CFB mice (Continuted)
[0103] Example 4 The effcets of siRNA conjugates in NHP
[0104] Some siRNAs achieved high knockdown effect in humanized mice were validated in NHP (macaca fascicularis) with single administration at 2mpk, n=4. Plasma samples were collected weekly until 84 days post siRNA administration, while liver samples were collected every 4 weeks until 84 days post siRNA administration. CFB protein inhibition were evaluated by WB in Jess system. The primary antibody detecting plasma CFB were purchased from Abcam (ab309149) , and the primary antibody detecting transferrin were purchased from Proteintech (17435-1-AP) . Plasma CFB protein levels were normalized by Transferrin levels and them normalized by corresponding predose level of each animal. All supplies required for WB were purchased from ProteinSimple. Plasma Ba / Bb level were detected with ELISA kits purchased from Quidel Ortho, with MicroVueTM Ba EIA kit for Ba detection and MicroVueTM Bb Plus EIA for Bb detection. Plasma AP activity were detected with WIESLAB Complement Alternative Pathway assay kits purchased from SVAR LifeScience. All the detection were performed as the instruction, with data normalized by corresponding predose level of each animal. CFB mRNA levels were detected with Taqman qPCR assay and normalized by corresponding predose level of each animal. Results were shown in Table 4-1, Table 4-2, Table 4-3, Table 4-4, Table 4-5.
[0105] Table 4-1 Inhibitory activity of siRNAs in NHP (Plasma CFB)
[0106] Table 4-2 Inhibitory activity of siRNAs in NHP (Plasma Ba)
[0107] Table 4-3 Inhibitory activity of siRNAs in NHP (Plasma Bb)
[0108] Table 4-4 Inhibitory activity of siRNAs in NHP (Plasma Alternative Pathway Activity)
[0109] Note: “ / ” means not detected
[0110] Table 4-5 Inhibitory activity of siRNAs in NHP (Liver CFB mRNA)
[0111] The embodiments of the present disclosure described above are exemplary only, and any person skilled in the art can recognize or can determine numerous equivalents of specific compounds, materials and operations without the need for unconventional tests. All these equivalents are within the scope of the present disclosure and are included in the claims.
Claims
1.A double-stranded ribonucleic acid (dsRNA) agent for inhibiting the expression of complement CFB (CFB) , wherein the dsRNA agent comprises a sense strand and an antisense strand, wherein the antisense strand comprises a region complementary to the transcript of CFB, and the complementary region comprises at least 15 contiguous nucleotides differing by no more than 3 nucleotides from the nucleotide sequences of any one of the antisense strands listed in Table 1-1.2.A double-stranded ribonucleic acid (dsRNA) agent for inhibiting the expression of CFB, wherein the dsRNA agent comprises a sense strand and an antisense strand,wherein the sense strand has the structure as shown in formula (i) :5’-Q1-X-Q2-3’, formula (i)wherein Q1 and Q2 are 0, 1 or 2 nucleotides selected from A, U, T, C, and G nucleotide motifs; X is a sequence comprising positions 1 to n1 of any sense strand sequence as shown in Table 1-1, and n1 is position 18 or 19;the antisense strand has the structure as shown in formula (ii) :5’-Q3-Y-Q4-3’, formula (ii)wherein Q3 and Q4 are 0, 1 or 2 nucleotides selected from A, U, T, C, and G nucleotide motifs; Y is a sequence containing positions n2 to n3 of any antisense strand sequence as shown in Table 1-1, n2 is position 1 or 2, and n3 is position 18, 19, 20 or 21.3.The dsRNA agent according to claim 1 or 2, wherein the dsRNA agent comprises at least one modified nucleotide.4.The dsRNA agent according to claim 1 or 2, wherein all or substantially all nucleotides on the antisense strand are modified nucleotides, and preferably all nucleotides on the sense chain and antisense chain are modified nucleotides.5.The dsRNA agent according to claim 1 or 2, which comprises a sense strand and an antisense strand, wherein(1) the sense strand comprises a nucleotide sequence X, the antisense strand comprises a nucleotide sequence Y, the nucleotide sequence X and the nucleotide sequence Y are at least partially reverse-complementary to form a double-stranded region; and,(2) each nucleotide in the sense strand and the antisense strand is independently a fluorinated modified nucleotide or a non-fluorinated modified nucleotide; and,(3) the fluorinated modified nucleotide is located in the nucleotide sequence X and the nucleotide sequence Y; and,(4) from the 5' end to the 3' end, in the sense strand, the nucleotides at positions 7, 9, 10, 14 and 15 of the nucleotide sequence X are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the sense strand are non-fluorinated modified nucleotides; or from the 5' end to the 3' end, in the sense strand, the nucleotides at positions 7, 9, 10 and 15 of the nucleotide sequence X are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the sense strand are non-fluorinated modified nucleotides; and(5) from the 5' end to the 3' end, in the antisense strand, the nucleotides at positions 2, 4, 7, and 14 of the nucleotide sequence Y are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the antisense strand are non-fluorinated modified nucleotides; or from the 5' end to the 3' end, in the antisense strand, the nucleotides at positions 2, 3, 5, 7, and 14 of the nucleotide sequence Y are fluorinated modified nucleotides, and the nucleotides at the remaining positions in the antisense strand are non-fluorinated modified nucleotides; and,(6) the dsRNA targets and inhibits complement CFB (CFB) .6.The dsRNA agent according to claim 3 or 4, wherein the at least one modified nucleotide includes: 2'-O-methyl nucleotide, 2'-fluoro nucleotide, 2'-deoxynucleotide, locked nucleic acid (LNA) , unlocked nucleic acid (UNA) , glycol nucleic acid (GNA) , 2'-F-arabinose nucleotide, 2'-methoxyethyl nucleotide, abasic nucleotides, ribitol, reverse nucleotides, reverse abasic nucleotides, reverse 2'-OMe nucleotide, reverse 2'-deoxynucleotide, 2'-amino modified nucleotide, 2'-alkyl modified nucleotide, morpholino nucleotide and 3'-OMe nucleotide, nucleotides containing a 5'-phosphorothioate group, or terminal nucleotides linked to cholesterol derivatives or dodecanoate bisdecylamide groups, 2'-amino modified nucleotides, phosphoramidates, or unnatural bases containing nucleotides.7.The dsRNA agent according to any one of claims 3-6, wherein the dsRNA agent further comprises E-vinylphosphonate nucleotide at the 5' end of the sense strand and / or antisense strand; or comprises at least one phosphorothioate internucleoside linkage in the sense strand and / or antisense strand.8.A double-stranded ribonucleic acid (dsRNA) agent for inhibiting the expression of CFB wherein the modified dsRNA agent comprises a sense strand and an antisense strand, wherein the antisense strand comprises a region complementary to the transcript of CFB, and the complementary region comprises at least 15 consecutive nucleotides differing no more than 3 nucleotides from the nucleotide sequences of any one of the antisense strand listed in Table 1-3.9.A double-stranded ribonucleic acid (dsRNA) agent for inhibiting the expression of CFB, wherein the dsRNA agent comprises a sense strand and an antisense strand,Wherein the sense strand has the structure as shown in formula (i) :5’-Q1-X-Q2-3’, formula (i)wherein Q1 and Q2 are 0, 1 or 2 nucleotide sequences selected from A, U, T, C, and G nucleotide motifs; X is a sequence containing positions 1 to n1 of any sense strand sequence as shown in Table 1-3, and n1 is position 18 or 19;wherein the antisense strand has the structure as shown in formula (ii) :5’-Q3-Y-Q4-3’, formula (ii)wherein Q3 and Q4 are 0, 1 or 2 nucleotides selected from A, U, T, C, and G nucleotide motifs; Y is a sequence containing positions n2 to n3 of any antisense strand sequence as shown in Table 1-3, n2 is position 1 or 2, and n3 is position 18, 19, 20 or 21.10.The dsRNA agent according to any one of the preceding claims, wherein the length of the double-stranded region is selected from:(i) 19 to 30 nucleotide pairs; or(ii) 19 to 25 nucleotide pairs; or(iii) 19 to 21 nucleotide pairs; or(iv) 19 to 23 nucleotide pairs; or(v) 21 to 23 nucleotide pairs; or(vi) each strand independently does not exceed 25 nucleotides; or(vii) each strand independently does not exceed 23 nucleotides; or(viii) each strand independently does not exceed 21 nucleotides.11.The dsRNA agent according to any one of the preceding claims, wherein the dsRNA agent has(i) two blunt ends; or(ii) at least one strand contains a 3’ overhang of at least 1 nucleotide; or(iii) at least one strand contains a 3’ overhang of at least 2 nucleotides.12.The dsRNA agent according to any one of the preceding claims, wherein:I) the sequence of sense strand or X in sense strand is SEQ ID NO: 139, the sequence of antisense strand or Y in antisense strand is SEQ ID NO: 140; orII) the sequence of sense strand or X in sense strand is SEQ ID NO: 141, the sequence of antisense strand or Y in antisense strand is SEQ ID NO: 142.13.The dsRNA agent according to any one of the preceding claims further comprising a ligand.14.The dsRNA agent according to claim 13, wherein the ligand is conjugated to the sense strand, and preferably the sense chain is conjugated to a ligand attached at the 3' end.15.The dsRNA agent according to claim 13 or 14, wherein the ligand is an N-acetylgalactosamine (GalNAc) derivative.16.The dsRNA agent according to any one of claims 13-15, wherein the ligand is one or more GalNAc derivatives attached via a monovalent, divalent, trivalent or tetravalent branched linker.17.A pharmaceutical composition comprising the dsRNA agent according to any one of the preceding claims for inhibiting the expression of the gene encoding CFB; preferably, in which the expression of CFB was reduced by at least 50%in animals.18.The pharmaceutical composition according to claim 17, wherein the pharmaceutical composition further comprises a pharmaceutically acceptable carrier, a buffer solution, a non-buffer solution, or an additional therapeutic agent.19.The pharmaceutical composition according to claim 17 or 18, wherein the pharmaceutical composition is packaged in a kit, a container, a wrapper, a dispenser, a prefilled syringe or a vial.20.The pharmaceutical composition according to any one of claims 17-19, wherein the pharmaceutical composition is formulated for subcutaneous administration or is formulated for intravenous (IV) administration.21.A cell comprising the dsRNA agent according to any one of the preceding claims.22.The cell according to claim 21, wherein, the cell is a mammalian cell, optionally a human cell.23.A conjugate comprising the dsRNA according to any one of claims 1-16 or the pharmaceutical composition according to any one of claims 17-20.24.A method for inhibiting the expression of CFB gene, comprising contacting the cell with the dsRNA agent according to any one of claims 1-16 or the pharmaceutical composition according to any one of claims 17-20 or the conjugate according to claim 23, thereby inhibiting the expression of the CFB gene in the cell.25.A method for treating or preventing a subject suffering from a condition that would benefit from reduced expression of CFB, comprising administering to the subject a therapeutically or prophylactically effective amount of the dsRNA agent according to any one of claims 1-16 or the pharmaceutical composition according to any one of claims 17-20, or the conjugate according to claim 23, thereby treating or preventing the subject suffering from a condition that would benefit from reduced expression of CFB.26.The method according to claim 24 or 25, wherein(i) the cell is in the body of a subject, and preferably, the subject is a human; and / or(ii) the subject suffers from CFB-related condition; and / or(iii) the cell is in the body of a subject and the dsRNA agent is administered subcutaneously to the subject; and / or(iv) the cell is in the body of a subject and the dsRNA is administered intravenously (IV) to the subject; and / or(v) contacting the cell with the dsRNA agent, thereby the expression of CFB is inhibited by at least 50%.27.The method according to claim 25 or 26, wherein the condition is an CFB-associated disease, including but not limited to paroxysmal nocturnal hemoglobinuria (PNH) , C3 glomerulopathy (C3G) , immunoglobulin A nephropathy (IgAN) , membranous nephropathy (MN) and atypical hemolytic uremic syndrome (aHUS) .