79 results about "Single stranded oligonucleotides" patented technology

The present invention addresses the problem of providing a lipid nanoparticle in which a nucleic acid, etc., required in genome editing is encapsulated and which can be produced by an alcohol dilution method using flow channels and contributes to high genome editing efficiency. The present invention pertains to a lipid nanoparticle which comprises a lipid component, a DNA nuclease, a guide RNA and a single-stranded oligonucleotide, wherein: the lipid component comprises a pH-sensitive cationic lipid, a neutral phospholipid and a polyalkylene glycol-modified lipid; the ratio of the pH-sensitive cationic lipid relative to the total lipids constituting the lipid nanoparticle is 30-50 mol %; the ratio of the neutral phospholipid relative to the total lipids constituting the lipid nanoparticle is 20-50 mol %; and the ratio of the polyalkylene glycol-modified lipid relative to the total lipids constituting the lipid nanoparticle is 1-4 mol %.

The present application relates to siRNA and oligonucleotide agents for use in the prevention or treatment of SOD1-related neurodegenerative diseases or conditions, such as amyotrophic lateral sclerosis, ALS. The oligonucleotide agent comprises a double-stranded targeting oligonucleotide (siRNA) and a non-targeting single-stranded oligonucleotide (ACO), wherein the siRNA targets the mRNA region of the target gene SOD1.

The present invention relates to hybrid full LNA oligonucleotides. The present report relates to hybridizing single stranded (ss-) oligonucleotides consisting entirely of locked nucleic acid (LNA) monomers. This document shows hybridization experiments of pairs of fully complementary ss-oligonucleotides that fail to form double strands within a given time interval. The present report provides a method of identifying such incompatible oligonucleotide pairs. In another aspect, the present report provides pairs of complementary ss-oligonucleotides capable of rapidly forming double strands. The present report also provides methods of identifying and selecting compatible oligonucleotide pairs. In another aspect, the present report provides the use of a compatible oligonucleotide pair as a binding partner in binding assays, such as receptor-based assays.

The application discloses an oligonucleotide hydrogel and a preparation method and application thereof, and comprises the following steps: sequentially adding oligonucleotide and PBS buffer into a metal salt solution to obtain a mixed solution; placing the mixed solution in a shaking table and oscillating and incubating; after incubation, centrifuging, discarding the supernatant and reserving the precipitate; resuspending the precipitate by adding deionized water, centrifuging, discarding the supernatant and washing to obtain the hydrogel; the application only needs single-stranded oligonucleotide, has no special requirements on the sequence composition and structure of the oligonucleotide, does not need special design, can be assembled with divalent and trivalent metal ions, has a simple process, is easy to operate, and can wrap biological enzymes in the hydrogel, realizes enzyme immobilization and recycling.

Disclosed herein are methods of purifying oligonucleotides, such as by separating double stranded oligonucleotides from single stranded oligonucleotides. An apparatus for performing such a method is also provided. Also provided are double-stranded nucleic acid compositions and single-stranded nucleic acid compositions made using the methods and devices disclosed herein. Methods of producing the cyclic double-stranded nucleic acids are also provided.

A system for analyzing biological components in a biological sample, wherein the system comprises a planar surface, and wherein the system is configured to perform a procedure comprising: (a) arranging a spatially connected biological sample adjacent to the planar surface, wherein: the spatially connected biological sample comprises a tissue sample, the tissue sample comprises a plurality of cells, the planar surface comprises glass, plastic, or a combination thereof, the planar surface further comprises a plurality of binding sites, the plurality of binding sites is arranged in a two-dimensional pattern on the planar surface, the planar surface comprises at least 10⁵ binding sites, each of the plurality of binding sites comprises a plurality of single-stranded oligonucleotides, and the plurality of single-stranded oligonucleotides is coupled to the planar surface.at least one subset of the plurality of single-stranded oligonucleotides comprises: (i) a binding sequence comprising a plurality of thymine bases configured to bind to poly-A sequences, (ii) a unique molecular identifier, (iii) a barcode associated with a position on the planar surface, and (iv) a sequencing primer, and each oligonucleotide of the subset of the plurality of single-stranded oligonucleotides comprises at least 50 nucleotides; (b) imaging at least a portion of the spatially linked biological sample, wherein the imaging comprises bright-field imaging, phase-contrast imaging, fluorescence imaging, or a combination thereof; (c) releasing nucleic acids from the spatially linked biological sample; and (d) capturing at least one subset of the nucleic acids on at least the subset of single-stranded oligonucleotides, thereby recovering the captured nucleic acids.the captured nucleic acids are immobilized on the flat surface.

A process for producing double stranded oligonucleotides is described wherein in an automated crossflow equipment a solution of a first single strand oligonucleotide is continuously crossflow-filtered until a target concentration is reached and thereafter a solution of a second single strand oligonucleotide is continuously crossflow-filtered under conditions which allow annealing until the completion of the annealing is detected.

This invention provides a preventive and / or therapeutic agent for cystic kidney disease. The preventive and / or therapeutic agent for cystic kidney disease comprises a single-stranded oligonucleotide containing a base sequence complementary to at least a portion of the base sequence of miR-21.

To provide an aptamer that binds to an S protein of SARS-CoV-2 omicron variant.SOLUTION: Provided is a nucleic acid aptamer having binding ability to SARS-CoV-2, where the nucleic acid aptamer includes a single strand oligonucleotide having a nucleotide as a constitutional unit, the single strand oligonucleotide includes a loop region, a 3' stem region bonded to a 3' terminal of the loop region, and a 5' stem region bonded to a 5' terminal of the loop region, the base number of the loop region is 16 to 50 mer, the base number of the 3' stem region is 5 mer or more, the base number of the 5' stem region is 5 mer or more, and the 3' stem region and the 5' stem region have mutually complementary base sequences.SELECTED DRAWING: Figure 1

A single-stranded oligonucleotide having a length of 16-30 nucleotides. The single-stranded oligonucleotide and complement component C3 (CC3) mRNA have sufficient complementarity to mediate RNAi effect; each nucleotide in the single-stranded oligonucleotide is a modified or unmodified nucleotide, at least one nucleotide in the single-stranded oligonucleotide is a nucleotide X, and the at least one nucleotide is a fluoro-modified nucleotide; moreover, according to a direction from the 5' end to the 3' end, at least one nucleotide X is located after an eighth nucleotide and is spaced apart from the eighth nucleotide in the single-stranded oligonucleotide by 4-7 nucleotides; and each nucleotide X is a deoxynucleotide or an unmodified nucleotide. The present invention further relates to a double-stranded oligonucleotide comprising the single-stranded oligonucleotide as an antisense strand, an oligonucleotide conjugate, and a pharmaceutical composition.

A single-stranded oligonucleotide having a length of 16-30 nucleotides. The composition of the single-stranded oligonucleotide enables the single-stranded oligonucleotide to inhibit the expression of target mRNA by means of an RNAi mechanism. Each nucleotide in the single-stranded oligonucleotide is independently a modified or unmodified nucleotide, wherein at least one nucleotide in the single-stranded oligonucleotide is a nucleotide X; at least one nucleotide is a fluoro-modified nucleotide; and, in the 5' to 3' direction, the 13th nucleotide of the single-stranded oligonucleotide is a substituted alkoxy-modified nucleotide, the 14th nucleotide of the single-stranded oligonucleotide is a nucleotide X, and each of the 15th nucleotide and all subsequent nucleotides of the single-stranded oligonucleotide is independently a modified nucleotide. A double-stranded oligonucleotide comprising the single-stranded oligonucleotide as an antisense strand, an oligonucleotide conjugate and a pharmaceutical composition.

The invention relates to a single-stranded oligonucleotide marked by a fluorescent substance and a quenching substance. A single-stranded oligonucleotide that forms a hairpin structure on the 5'side by means of self-hybridization, forms a three-layer chain structure on the 5 '-terminal portion when a single-stranded oligonucleotide having a base sequence complementary to the 3' side hybridizes, and dissociates the fluorescent substance and the quenching substance by cleavage of a flap endonuclease in which the three-layer chain structure is recognized, thereby forming a single-stranded oligonucleotide having a hairpin structure on the 5 '-side and a single-stranded oligonucleotide having a nucleotide sequence complementary to the 3'-side. Fluorescent light is emitted under the irradiation of exciting light; the single-stranded oligonucleotide satisfies any one of the following (A) to (C): (A) a single-stranded oligonucleotide containing a non-complementary base pair inside the hairpin structure. And (B) a single-stranded oligonucleotide in which the nucleotide residue labeled with the fluorescent substance and the nucleotide residue labeled with the quenching substance are separated by four or more residues. And (C) a single-stranded oligonucleotide in which the fluorescent substance is bound to a portion other than a base.

The present disclosure relates to methods of inhibiting in a subject in need thereof, the RNAi inhibitory activity of a double stranded ribonucleic acid (dsRNA) agent, or a salt thereof, that inhibits the expression of an angiotensinogen (AGT) gene; ameliorating in a subject in need thereof, a side effect of a dsRNA agent, or a salt thereof, that inhibits the expression of an AGT gene; and / or treating a subject in need thereof, previously administered a dsRNA agent, or a salt thereof, that inhibits the expression of an angiotensinogen AGT gene, by administering to the subject a fixed dose of a single stranded oligonucleotide, and compositions thereof.

The invention relates to a conjugate comprising or consisting of (a) at least one molecule capable of specifically binding to at least one analyte; and at least one nucleic acid nanostructure (b); wherein said nucleic acid nanostructure of (b) comprises a plurality of single-stranded oligonucleotides; and wherein at least two of said plurality of oligonucleotides each comprise a first identical nucleobase sequence.

The present invention relates to 5'-modified nucleoside analogs and oligonucleotides produced therefrom, and more specifically, to modified nucleosides and their analogs that can be used to be incorporated into the oligonucleotide terminus, which can be bound to double-stranded oligonucleotides (short interfering RNA) or single-stranded oligonucleotides (e.g., antisense oligonucleotides). The oligonucleotides provided herein are expected to result in the loss of normal function of the target RNA by hybridizing to a portion of the target RNA.

This invention provides a method for screening highly specific nucleic acid aptamers and specific *Lactobacillus helveticus* aptamers, belonging to the field of nucleic acid aptamers. Specifically, the method for screening highly specific nucleic acid aptamers provided by this invention includes the following steps: S1: A second library is obtained after N rounds of forward screening of a first library; S2: A third library is obtained after M rounds of reverse screening of the second library; S3: The third library is obtained after X rounds of forward screening of the third library to obtain selected random single-stranded oligonucleotides, which are then subjected to PCR amplification, purification, cloning, and sequencing; S4: The sequences cloned and sequenced in step S3 are used for affinity and specificity assays to select sequences with high affinity and specificity, thereby obtaining highly specific nucleic acid aptamers. The aptamers provided by this invention have the advantages of high specificity and strong affinity, and the construction method of the aptamers provided by this invention has the advantage of short screening time.

The invention discloses a terminal transferase mutant, a recombinant protein, a nucleic acid molecule and an oligonucleotide single base extension method, and relates to the technical field of oligonucleotide synthesis. The terminal transferase mutant has at least 80% of identity with an amino acid sequence as shown in SEQ ID NO: 1, and has amino acid mutation at at least one of the following positions: R323, W427 and R438. Compared with wild-type terminal transferase, the terminal transferase mutant has the advantages that after amino acid in a catalytic structural domain of the terminal transferase mutant is changed, the catalytic capability of the terminal transferase mutant on nucleoside triphosphate with a 3 '-O-blocking group can be remarkably improved, so that the nucleoside triphosphate with the 3'-O-blocking group is efficiently coupled to a single-stranded oligonucleotide chain. On the basis, the invention further develops an oligonucleotide single base extension method. The method has the technical advantages that the humidity does not need to be controlled, the usage amount of chemical reagents is small, the product purity is high, and few chemical synthesis byproducts are generated.

Described herein are oligonucleotides such as 5'-cyclic phosphonate modified nucleotides and RNA interference (RNAi) agents comprising such nucleotides. The RNAi agents described herein, comprising double-stranded or single-stranded oligonucleotides comprising 5'-cyclic phosphonate modified nucleotides, can be used to modulate gene expression and for therapeutic, diagnostic, target validation, and genomic development applications. RNAi agents and single-stranded antisense oligonucleotides comprising 5'-cyclic phosphonate modified nucleotides can be used to treat diseases or conditions that respond to inhibition of gene expression or activity in cells, tissues, or organisms.

The invention relates to the technical field of molecular biology, in particular to a structural probe and application thereof. The invention provides a nucleic acid probe which is single-stranded oligonucleotide, and the single-stranded oligonucleotide has a stem-loop structure; the number of the stem rings is larger than or equal to 2. The detection method provided by the invention is high in sensitivity, has ultrahigh sensitivity higher than that of a common single-chain fluorescent probe as an RNase reaction substrate, and can detect RNase A as low as 0.1 pg / ml. The probe disclosed by the invention has broad spectrum and has detection capability on various ribonuclease.

Aspects of the present application provide methods for analyzing tissue samples. The methods may include disposing a tissue sample on a surface. The tissue sample may be imaged. In certain aspects, nucleic acids from the tissue sample may also be analyzed. In some such aspects, the surface can include a plurality of capture sites that contain single-stranded oligonucleotides, and nucleic acids from the tissue sample may be captured using at least a subset of the single-stranded oligonucleotides.

The present disclosure provides a single-stranded oligonucleotide, wherein the single-stranded oligonucleotide has a length of 16-30 nucleotides and can inhibit the expression of APOE4 mRNA by the mechanism of RNA interference (RNAi); wherein each nucleotide in the single- stranded oligonucleotide independently of one another is a modified or unmodified nucleotide; and wherein at least one nucleotide is a nucleotide X, and at least one nucleotide is a fluoro modified nucleotide; and in a 5' to 3' direction, in the single-stranded oligonucleotide, the 13th nucleotide is a substituted alkoxy modified nucleotide; the 14th nucleotide is a nucleotide X; and each of the 15th nucleotide and all the subsequent nucleotides independently of one another is a modified nucleotide; and each nucleotide X is independently a deoxyribonucleotide or an unmodified nucleotide. The present disclosure also provides a double-stranded oligonucleotide, an oligonucleotide conjugate and a pharmaceutical composition comprising the single-stranded oligonucleotide as an antisense strand.

One aspect of the present invention relates to a single-stranded oligonucleotide having a having a sequence represented by formula (I): (5′-Z1-3′)-Q1-L-Q2-(5′-Z2-3′) (I). In formula (I), Z1 is a first oligonucleotide, comprising 15-100 optionally modified nucleotides that is substantially complementary to a target gene; Z2 is a second oligonucleotide, comprising 15-100 optionally modified nucleotides that is substantially complementary to Z1; and Z1 and Z2 are capable of forming an intra-strand duplexed region comprising 3 or more consecutive base pairs. L is a linking group. Q1 and Q2 each independently represent 0 to 12 optionally modified nucleotides. At least one nucleotide in formula (I) is a modified nucleotide. Other aspects of the invention relate to a pharmaceutical composition and a method for inhibiting the expression of one or more target gene in a subject.

Provided is a single-stranded oligonucleotide having a length of 16-30 nucleotides. The single-stranded oligonucleotide and APOC3mRNA have sufficient complementarity to mediate an RNAi effect. Each nucleotide in the single-stranded oligonucleotide is a modified or unmodified nucleotide. At least one nucleotide in the single-stranded oligonucleotide is a nucleotide X, and at least one nucleotide is a fluoro-modified nucleotide. In the direction from the 5' end to the 3' end, at least one nucleotide X is located after the eighth nucleotide of the single-stranded oligonucleotide and spaced apart from the eighth nucleotide of the single-stranded oligonucleotide by 4-7 nucleotides. Each nucleotide X is a deoxynucleotide or an unmodified nucleotide. Further provided are a double-stranded oligonucleotide comprising the single-stranded oligonucleotide as an antisense strand, an oligonucleotide conjugate, and a pharmaceutical composition.

A method of sequencing a nucleic acid characterized by the steps of: (1) generating a stream of mononucleoside triphosphate by progressive enzymatic digestion of the nucleic acid; (2) producing at least one oligonucleotide-used probe by reacting at least one mononucleoside triphosphate with a corresponding biological probe in the presence of a polymerase, the corresponding biological probe comprising (a) a first single stranded oligonucleotide comprising an exonuclease closure site and (b) a second single stranded oligonucleotide comprising an exonuclease closure site; the present invention relates to a kit comprising (a) a single nucleotide triphosphate, (b) a closure site 5'side of the closure site and comprising a restriction endonuclease recognition site for capturing the mononucleotide triphosphate, and at least one fluorophore region located 5 'side of the recognition site and arranged to quench a fluorophore, and (b) second and optionally third single stranded oligonucleotides, their isolated from the first oligonucleotides, respectively, and capable of hybridizing to complementary regions on the first oligonucleotides flanking the capture sites 3'and 5 '; (3) cleaving the first oligonucleotide strand of the used probe at a recognition site with a restriction endonuclease to produce a first oligonucleotide component with a fluorophore; (4) digesting the first oligonucleotide component with an enzyme having 3 '-5' exonucleotide activity to produce a fluorophore in a detectable state, and (5) detecting the fluorophore released in step (4). Also provided are corresponding methods for use with enzymes having 5 '-3' exonuclease activity, as well as novel bioprobes and kits obtained therefrom.

The present disclosure relates to multimeric oligonucleotides comprising subunits, each of the subunits independently comprises a single-stranded or double-stranded oligonucleotide. Each of the subunits is joined to another subunit by a covalent linker, and at least one subunit comprises at least one partial single-stranded oligonucleotide. The present disclosure also relates to methods of synthesizing the multimeric oligonucleotides and the methods of using the multimeric oligonucleotides disclosed herein.

A method of producing an oligonucleotide is provided. By using a complementary strand into which a moiety that lowers the stability of a hybrid formed between a complementary strand and a ligation product is introduced, a single-stranded oligonucleotide which is a substrate is enzymatically ligated to produce an oligonucleotide which is the ligation product.

The invention provides a tetrahedral framework nucleic acid related to miR-22 as well as a preparation method and application thereof. The tetrahedral framework nucleic acid is formed by a first single-stranded oligonucleotide, a second single-stranded oligonucleotide, a third single-stranded oligonucleotide and a fourth single-stranded oligonucleotide through base complementation. The tetrahedral framework nucleic acid provided by the invention is a nucleic acid drug delivery system with high delivery efficiency, good structural stability and low immunogenicity, and provides an efficient, accurate and low-toxicity new scheme for the treatment of eye lesions.

The present application provides a method and device for splitting a DNA sequence, the method comprising: determining a search region in a DNA sequence according to a preset oligonucleotide length; intercepting a DNA sequence in the search region according to a preset sequence length to obtain a DNA subsequence group; scoring the DNA subsequence group through a deep learning model, and determining the DNA subsequence with the highest score from the DNA subsequence group as a target sequence according to the scoring result; adjusting the number of bases of the target sequence according to the principle of similar DNA denaturation temperature to obtain a base complementary pairing region between single-stranded oligonucleotides when the DNA sequence is split; splitting the DNA sequence according to the base complementary pairing region to obtain a single-stranded oligonucleotide. Through the method provided by the present application, the base complementary pairing region with the highest score can be obtained from the DNA sequence, and the DNA sequence can be split, thereby improving the assembly efficiency of PCA assembly.