33 results about "Oligonucleotide Linker" patented technology

The present invention provides a simple and rapid method for preparing purified transposase complexes that are highly suited for fragmenting DNA. The method includes forming transposase complexes with oligonucleotide adapters in cell lysate, then purifying the complexes from the other substance in the cell lysate. Purification is accomplished using a specific binding pair, in which one member of the pair is bound to an oligonucleotide adapter of the complex and the other member of the pair is bound to a solid substrate. The bound complexes can be immediately used in DNA fragmentation reactions to produce solid substrate-bound DNA fragments, which can be used for any number of purposes, including as templates for amplification and sequencing.

Currently, the circularization of small RNAs is broadly regarded as an obstacle in ligation-related assays and explicitly avoided while short lengths of linear RNA targets is broadly recognized as a factor limiting use of conventional primers in PCR-related assays. In contrast, the disclosed invention capitalizes on circularization of small RNA targets or their conjugates with oligonucleotide adapters. The circular RNA templates provide amplification of the target sequences via synthesis of multimer nucleic acids that can be either labeled for direct detection or subjected to PCR amplification and detection. Structure of small circular RNAs and corresponding multimeric nucleic acids provide certain advantages over current methods including flexibility in design of conventional RT and PCR primers as well as use of 5′-overlapping dimer-primers for efficient and sequence-specific amplification of short target sequences. Our invention also reduces number of steps and reagents while increasing sensitivity and accuracy of detection of small RNAs with both 2′OH and 2′-OMe at their 3′ ends. Our invention increase sensitivity and specificity of detection of microRNAs and other small RNAs with both 2′OH and 2′-OMe at their 3′ ends while allowing us to distinguish these two forms from each other.

The invention relates to a method for cleavage of a linker from an oligonucleotide comprising contacting an oligonucleotide-linker conjugate with a gaseous nucleophilic cleavage reagent under conditions that result in the cleavage of the linker from the oligonucleotide.

The present invention provides an improved method for cDNA preparation. The method of the present invention comprises the following steps: (1) contacting mRNA with a cDNA synthesis primer which can anneal to RNA and a suitable enzyme which possesses reverse transcriptase activity under conditions sufficient to permit the template-dependent extension of the primer to generate an mRNA-cDNA intermediates; (2) contacting a mixture from step 1 with a deoxyribonucleotide adapter in the presence of Mn²⁺-ions, wherein said oligonucleotide adapter has a pre-selected arbitrary nucleotide sequence at its 5′-end, and a short dG stretch at its 3′-end. The 3′-end nucleotide of the adapter is a terminator nucleotide, e.g., a nucleotide with a modified 3′-OH group of a deoxyribose residue.

The present invention provides an oligonucleotide linker, and particularly relates to uses of the oligonucleotide linker in construction of a single-chain cyclic library in nucleic acid sequencing, and further in sequencing platforms requiring single-chain cyclic libraries. The oligonucleotide linker of the present invention has advantages of high sequencing throughput, high accuracy, and easy operation.

The invention discloses a single-chain antibody of broad-spectrum anti-p21ras protein and a preparation method thereof. The gene segment of the single-chain antibody is constructed by connecting light and heavy chain variable region gene segments of monoclonal antibody hybridoma cell strains of the broad-spectrum anti-p21ras protein through flexible oligonucleotide linkers; the gene segment of the single-chain antibody is connected with a phagemid expression vector to construct recombinant phagemid; the recombinant phagemid is converted into amber inhibiting colon bacillus TG1 to perform fusion expression; the positive recombinant phagemid is identified by using indirect ELISA screening through phage library exhibition; the positive recombinant phagemid is converted into non-amber inhibiting colon bacillus BL21 (DE3) to perform soluble expression of the single-chain antibody; indirect enzyme-linked immunosorbent assay and immune cell and tissue chemical experiments prove that the single-chain antibody for the soluble expression has strong binding specificity with three p21ras proteins of H-ras, K-ras and N-ras and high affinity; and the single-chain antibody is used for constructing small molecular antibodies such as intracellular antigens and the like and used for diagnosis and research of ras gene related tumors.

The invention provides a whole blood immune repertoire detection method based on high-flux sequencing technology. The method comprises the following steps: (1) directly extracting RNA (ribonucleic acid) from a whole blood sample; (2) carrying out reverse transcription on the RNA to generate single chain cDNA (complementary deoxyribonucleic acid), connecting an oligonucleotide joint sequence to the tail end of the single chain cDNA, carrying out PCR (polymerase chain reaction) reaction on the single chain cDNA subjected to oligonucleotide joint sequence connection by using a universal primer and a special targeted primer P-VDJ (of which the sequence is GAC CTC GGG TGG GAA CAC) as a special primer pair for PCR reaction, and amplifying the immune receptor genome; and (3) carrying out high-flux sequencing. The method of directly extracting the RNA from the whole blood sample is more suitable for clinic; the single target specific primer is utilized to uniformly amplify the variable region of the subtype T cell receptor gene; and a Hi-SEQ 2500 of the Illumina corporation and a bar code are utilized for sequencing, thereby ensuring the lower cost, the sequencing time of less than 48 hours and favorable sequencing depth.

Oligonucleotide structures are provided that are capable of forming more stable bonds to a lipid membrane and thereby generate an improved control of the process whereby oligonucleotide linkers are introduced to lipid membranes. Methods of forming lipid membrane oligonucleotide attachments are provided including lipid vesicles. The oligonucleotides typically comprise at least two hydrophobic anchoring moieties capable of being attached to a lipid membrane. Said moieties may be attached at the terminal ends of an oligonucleotide or, in the case of a first and second strand forming a duplex, at the same terminal end one of the strands other end not being part of the duplex leaving it free to hybridize to additional strands. The lipid vesicles attached with the oligonucleotide can be used in biosensors and may contain membrane proteins.

Controlled delivery of nucleic acid into adhered of cells is achieved by immobilizing the nucleic acid and the cells to a substrate. Improved control over delivery is achieved by immobilizing the nucleic acid to the substrate via complimentary DNA binding interactions with an oligonucleotide linker.

The invention discloses a transposase complex containing a unique molecular identifier sequence and application of the transposase complex. The transposase complex is a complex formed by assembling oligonucleotide linkers and transposase. A next-generation sequencing library constructed by utilizing the transposase complex containing the UMI can effectively distinguish transposase insertion repeatevents and repeat reads caused by PCR, so that the utilization rate of sequencing data, the reliability of sequence variation and frequency identification of the sequence variation, the accuracy of gene expression and chromatin accessibility quantification, and the identification sensitivity of the footprint of the DNA binding protein are improved.

The present invention provides targeted delivery compositions and their methods of use in treating and diagnosing a disease state in a subject. Components of the targeted delivery compositions are put together through duplex formation between oligonucleotides.

A method for generating a library of expression vectors comprising a plurality of donor sequences and a plurality of oligo-linker nucleic acids, termed Oligonucleotide Linker-Mediated DNA Assembly (OLMA), is described. Also described are applications of the OLMA method, including the simultaneous tuning of several factors in metabolic and biological pathways, and the combinatorial high throughput optimization of metabolic and biological pathways.

The invention herein describes a method for identifying a DNA sequence, and oligonucleotide adaptors used in the identification of a DNA sequence.

The present invention provides a method for the assembly of a polynucleic acid sequence from a plurality of nucleic acid sequences in which the polynucleic acid sequence is of a formula N_n+1, in which N represents a nucleic acid sequence and where n is 1 or greater than 1 and each N may be the same or a different nucleic acid sequence, in which the method comprises: (i) providing a first nucleic acid sequence N1 which has an oligonucleotide linker sequence L1³ at the 3′-end of the nucleic acid sequence; (ii) providing a second nucleic acid sequence N2 which optionally has an oligonucleotide linker sequence L2^3′ at the 3′-end of the nucleic acid sequence and which has an oligonucleotide linker sequence L2^5′ at the 5′-end of the nucleic acid sequence, wherein the 5′-end linker sequence L2^5′ of nucleic acid sequence N2 is complementary to the 3′-end linker sequence L1^3′ of nucleic acid sequence N1; (iii) optionally providing one or more additional nucleic acid sequences N, wherein nucleic acid sequence N2 has an oligonucleotide linker sequence L2^3′ at the 3′-end of the nucleic acid sequence, and wherein said one or more additional nucleic acid sequences N comprises a terminal additional nucleic acid sequence NZ, and wherein each additional nucleic acid sequence N has an oligonucleotide linker sequence at its 3′-end, wherein said terminal additional nucleic acid sequence NZ optionally lacks an oligonucleotide linker sequence at its 3′-end and wherein each additional nucleic acid sequence N has an oligonucleotide linker sequence at its 5′-end, wherein for the first additional nucleic acid sequence N3 the 5′-end linker sequence L3^5′ is complementary to the 3′-end linker sequence L2^3′ of nucleic acid sequence N2 and for each second and subsequent additional nucleic acid sequence N the 5′-end linker sequence is complementary to the 3′-end linker sequence of the respective preceding additional nucleic acid sequence; and (iv) ligating said nucleic acid sequences to form said polynucleic acid sequence.

The present invention provides a method for the assembly of a polynucleic acid sequence from a plurality of nucleic acid sequences in which the polynucleic acid sequence is of a formula N_n+1, in which N represents a nucleic acid sequence and where n is 1 or greater than 1 and each N may be the same or a different nucleic acid sequence, in which the method comprises:

• • (i) providing a first nucleic acid sequence N1 which has an oligonucleotide linker sequence L1^3′ at the 3′-end of the nucleic acid sequence;
  • (ii) providing a second nucleic acid sequence N2 which optionally has an oligonucleotide linker sequence L2^3′ at the 3′-end of the nucleic acid sequence and which has an oligonucleotide linker sequence L2^5′ at the 5′-end of the nucleic acid sequence,
    • wherein the 5′-end linker sequence L2^5′ of nucleic acid sequence N2 is complementary to the 3′-end linker sequence L1^3′ of nucleic acid sequence N1;
  • (iii) optionally providing one or more additional nucleic acid sequences N, wherein nucleic acid sequence N2 has an oligonucleotide linker sequence L2^3′ at the 3′-end of the nucleic acid sequence, and wherein said one or more additional nucleic acid sequences N comprises a terminal additional nucleic acid sequence NZ, and wherein each additional nucleic acid sequence N has an oligonucleotide linker sequence at its 3′-end, wherein said terminal additional nucleic acid sequence NZ optionally lacks an oligonucleotide linker sequence at its 3′-end and wherein each additional nucleic acid sequence N has an oligonucleotide linker sequence at its 5′-end,
    • wherein for the first additional nucleic acid sequence N3 the 5′-end linker sequence L3^5′ is complementary to the 3′-end linker sequence L2^3′ of nucleic acid sequence N2 and for each second and subsequent additional nucleic acid sequence N the 5′-end linker sequence is complementary to the 3′-end linker sequence of the respective preceding additional nucleic acid sequence; and
  • (iv) ligating said nucleic acid sequences to form said polynucleic acid sequence;

wherein at least step (iv) is carried out on a microfluidic device.

Reagents and methods for epigenetic profiling using targeted chromatin ligation are disclosed. The method utilizes oligonucleotide adapters complexed with antibodies specific for DNA-binding proteins of interest and proximity ligation to tag fragmented chromatin with the adapters. Chromatin fragments having ligated adapters are amplified and sequenced with primers that hybridize to the adapters. This method can be used in epigenetic profiling, for example, for mapping histone modification patterns as well as transcriptional regulatory sites.

The present invention relates to a linker or population of linkers that include an oligonucleotide fixed portion and an oligonucleotide variable portion represented by formula (N)n, wherein N is A, C, G, T or U, or their derivatives, and n is an integer equal to or higher than 1. A linker-polynucleotide or a population of linker-polynucleotides of the invention may be constituted by said linker or population of linkers and a target first strand polynucleotide bound to said linker. The invention also encompasses a method of preparing said linker or population of linkers and a method of preparing a linker-polynucleotide using said linker or population of linkers. The linkers or polynucleotide-linkers of the invention can be used in a method of preparing a cDNA library.

Disclosed is a probe for use in biological assays. The probe includes a fluorescent dye bound to a quencher compound through an oligonucleotide linker. Also disclosed are methods of using the probe, such as for a polymerase chain reaction (PCR), such as in a quantitative PCR reaction (qPCR), as well as kits including the probe.

A method for manipulating the terminals of a double-stranded DNA. The principle thereof is using a restriction nicking enzyme to first generate one or more nicks on one strand of a double-stranded DNA, then using an oligonucleotide adaptor to bind the same or a different restriction nicking enzyme to generate cleavage on the other strand of the double-stranded DNA, the position of cleavage being determined by the design of the oligonucleotide adapter, and eventually cleaving the double-stranded DNA of interest and generating various lengths of 5′ io protruding terminals and various lengths of 3′ protruding terminals or blunt terminals at the nicks. The bases at the terminals of a double-stranded DNA generated by means of this method can be designed at will, and such terminals can be used for double-stranded DNA splicing, particularly seamless splicing of double-stranded DNA.