59 results about "RNA library" patented technology

This invention discloses a RNA adaptor preventing typhoid typhi from intruding into human body cells. This invention discloses a method for preparing the RNA adaptors by preparing and purifying TVB type cilium structure fusion protein-agarose 4B, constructing single strand DNA library randomly, comining double-strand DNA library, amplifying PCR, preparing RNA libraries, screen SELEX, selecting RCR to get RNA adaptors, which can be the agonist of typhi.

The invention provides a reverse transcription obstruction probe for rapidly removing target RNA in RNA library construction and application thereof. The probe has a length of 20-40 nt, is strictly complementarily paired with a target RNA sequence, and has no complementary pairing continuously exceeding 15 nt with other non-target RNAs, the Tm value of the probe is not lower than 80 DEG C, the self complementary value is less than 5, and 3'-OH of the probe is sealed by modified deoxyribonucleotide. According to the probe, a reverse transcription inhibition probe method is utilized to realize high-efficiency and high-specificity inhibition on reverse transcription of the target RNA during synthesis of one strand of cDNA, so that the target RNA is prevented from participating in a downstream library construction process. The probe has the advantages of simplicity in operation (one-step operation), extremely short consumed time (2 minutes), completeness in retention of the non-target RNAs, high specificity, high efficiency, low cost, high gene detection number and the like, and is very suitable for the fields of industrial automatic library building and rapid disease diagnosis.

The invention provides a construction method of a high-quality RNA library for enriching original transcript information by using RNase H and selectively removing lots of rRNA and blood globulin and an application thereof. The RNA library constructed by the method has very low rRNA residual volume (which is only 1/500 of residual volume in a conventional oligo(dT) method), and has very high gene coverage.

The invention belongs to the field of molecular biological techniques and application, and particularly relates to an optimized method for constructing an RNA high-throughput sequencing library and application of the optimized method. The optimized method for constructing the RNA high-throughput sequencing library is characterized in that the method adopts RNase III to break to-be-sequenced RNA, adopts RNA ligase to connect linkers and adopts reverse transcriptase and a high-fidelity DNA polymerase system to conduct one-step reverse transcription and labeling PCR to construct the high-throughput sequencing library. The method can be applied to construction of the RNA high-throughput sequencing library. According to the optimized method for constructing the RNA high-throughput sequencing library, RNA is directly adopted to add the linkers onto single-strands, the step of random primer amplification is omitted, the influences of random primers can be eliminated, and more comprehensive RNA information is obtained; and an one-step method is adopted to conduct reverse transcription and labeling PCR, intermediate steps are reduced, and the preparation efficiency of the RNA library and the sequencing quality are enhanced effectively.

The invention discloses a high-throughput method based on DNA (desoxyribonucleic acid) and RNA (ribonucleic acid) gene mutation detection. The method comprises the steps that (1) desoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are extracted from a biological sample collected from a subject through utilizing a reagent, and a DNA library is constructed based on desoxyribonucleic acid; ribonucleic acid is reversely transcribed into double-stranded cDNA firstly, and then is constructed into an RNA library; (2) a first probe set is mixed with the DNA library, and meanwhile, a second probe set is mixed with the RNA library; (3) a complex of probes and nucleic acid is separated and obtained from mixtures obtained in step (2) by utilizing markers in the first probe set and second probe set; (4) sequencing is performed on target nucleic acid in the complex by utilizing a high-throughput technique. The method is based on NGS methodology and optimizes the NGS methodology, so that the specificity and sensitivity of detection are further improved. In addition, a DNA detection result can also be verified by detecting RNA.

The invention discloses an absolute quantitative transcriptome library construction method based on a specific recognition sequence. Fragmented mRNA is used as a template, a first cDNA chain is synthesized under the action of reverse transcriptase by a primer pool with a general joint sequence, a library construction joint with a special recognition UID sequence is added to cDNA 3' end through anenzymatic reaction, so that each cDNA carries a unique sequence label; and finally, PCR amplification is performed by the general library construction joint to obtain an RNA library. The method constructs the RNA library on the basis of single-stranded cDNA by a splint connection method for the first time, at the same time, a UID sequence is used to precisely reduce the cDNA composition before PCRamplification and can realize precise quantification of transcripts. Library construction is performed by the single-stranded cDNA as a raw material, the step of second strand synthesis is omitted, the template loss rate is reduced, the cost and time are saved, and the defect that the prior art can relatively quantify transcripts is thoroughly solved.

The invention discloses a library building method based on high-throughput sequencing. The library building method based on the high-throughput sequencing is applicable to fragmented nucleotide samples, such as fragmented genomic DNA / FFPE RNA / cfDNActDNA and the like. Furthermore, the fragmented nucleotide samples are subjected to modification, denaturation and joint connection, followed by enrichment of target regions by two specific PCR reactions, so as to obtain a sequencing library; and the sequencing library is subjected to quality control and quantitative analysis so as to carry out high-throughput sequencing. The invention further provides a simulated double-chain connection joint. The library building method based on the high-throughput sequencing is simple and convenient, and retains advantages of multiplex PCR library building methods based on amplicons; and moreover, the library building method based on the high-throughput sequencing can also be used for detecting unknownfusion, and is especially applicable for detecting nucleotide samples (e.g. cfDNA / ctDNA sample) with relatively high degree of fragmentation. The library building method based on the high-throughput sequencing is also feasible for building libraries of DNA molecules with damages. The library building method based on the high-throughput sequencing disclosed by the invention is capable of retaining all original nucleotide information to the maximum extent; and moreover, no two-chain synthesis is required when the method is adopted for carrying out RNA library building.

The invention belongs to the technical field of genetic engineering, and particularly relates to a method for rapidly constructing a strand-specific RNA high-throughput sequencing library. The methodprovided by the invention completes construction of an RNA library in only four steps as follows: fragmentation, RT and PCR enrichment and library purification. Compared with a traditional RNA libraryconstruction method, the method provided by the invention simplifies operation flows, shortens time, has high efficiency and can produce a high-quality strand-specific RNA-seq library by only two enzymes.

The invention relates to a new method for constructing a chain specific RNA library and especially relates to a method for constructing the chain specific RNA library and an application. The method comprises the following steps: performing fragmentation treatment on RNA, thereby acquiring a fragmented RNA; performing reverse transcription on the fragmented RNA and then adopting RNase H for digesting a RNA/DNA heterozygote; connecting a digestion product with a joint, thereby acquiring a connected product; performing PCR amplification on the connected product, thereby acquiring an amplificationproduct, namely, the chain specific RNA library. According to the invention, RNase H is adopted for digesting the RNA/DNA heterozygote and then double-end joint connection is directly performed, so as to acquire the chain specific RNA library; due to an optimized reaction system, the process from sample RNA to joint connection can be finished by only adding reaction reagents in turn in a tube; compared with the conventional method for constructing the chain specific RNA library, the method provided by the invention is capable of overcoming complexity and tediousness of process and saving a large amount of manpower, time and reagent cost.

Provided are a variety of nucleic acid co-labeling supports, a preparation method therefor, and an application thereof. The supports comprise a support body, and a variety of nucleic acid labels located on the surface and/or inside of the support body. The nucleic acid labeled on a single support at least comprises: one or more first nucleic acid labels having a function that at least comprises of trapping a specific compound in a reaction system onto the surface of the support; and one or more second nucleic acid labels having a function that at least comprises participating in a specified biochemical reaction process of the specific compound trapped onto the surface of the support. The foregoing variety of nucleic acid co-labeled supports can be used for 5'-terminus single-cell RNA expression profile analysis, construction of a 5'-terminus single-cell VDJ library for a microwell array platform, construction of a 3'-terminus single-cell RNA library, construction of a single-cell transcriptome library, single-cell multi-omics research, multiplex PCR and/or construction of a multiplex PCR sequencing library, etc.

The invention provides a library preparation method, a kit and a sequencing method. The library preparation method comprises the following steps: obtaining a target nucleic acid molecule, namely performing reverse transcription on RNA (Ribonucleic Acid) from a nucleic acid sample to be detected to obtain a reverse transcription product which comprises RNA: DNA (Deoxyribose Nucleic Acid) hybrid double strands and RNA: DNA hybrid double strands enriched in the reverse transcription product; providing a transposal complex, wherein the transposal complex comprises a linker and a transposase, the linker is a double-stranded nucleic acid molecule with a known sequence; contacting the target nucleic acid molecule and the transposition complex under conditions suitable for a transposition reaction to obtain a transposition product, wherein the transposition product comprises a double-stranded nucleic acid molecule with a joint at the tail end and a gap; providing a first primer configured to hybridize with at least a portion of the linker; and hybridizing the transposon with the first primer and placing under conditions suitable for strand displacement reaction to obtain the library. The method is particularly suitable for rapid construction of RNA libraries with low initial quantities.

According to the invention, prawns have obvious sex bimorphism; sex determination and differentiation of the prawns often occur in an early development stage; thus, sex determination and sex differentiation related genes need to be screened in the early development stage of male and female individuals. Since prawn individuals at the early development stage are extremely small, and cannot be distinguished in sex, so a screening method for male and female differential expression genes of early embryos or larvae of the prawns is not established yet. According to the invention, co-extracting of DNA and RNA of a single individual of a prawn zoae is realized; a sex probe is used for sex identification on a DNA level; RNAs of a same gender are mixed to respectively construct a male RNA library and a female RNA library in a zoae stage; a micro transcriptome sequencing technology is utilized to obtain the female and male larva differential expression genes; thus, the screening method of the male and female differential expression genes of the early embryos or larvae of the prawns is established. The screening method provided by the invention promotes the research on sex determination and sex differentiation of the prawns and provides a basis for analyzing a sex determination and differentiation mechanism.

The invention provides a RNA library construction method. The construction method comprises the following steps: carrying out reverse transcription on fragmented RNA by adopting a reverse transcription primer to obtain a first strand cDNA, wherein the reverse transcription primer sequentially comprises a known sequence and a random sequence from 5' end to 3' end, carrying out single-chain linker connection on the first chain cDNA by adopting cyclase to obtain a connection product, carrying out PCR amplification on the connection product to obtain an RNA library, introducing a first sequencingprimer sequence while RNA is subjected to reverse transcription to synthesize first-chain cDNA, then directly carrying out single-chain linker connection through cyclase to introduce a second sequencing primer sequence, and finally, designing a proper amplification primer according to the first sequencing primer sequence and the second sequencing primer sequence to carry out PCR amplification on alinker connection product so that RNA libraries can be obtained. According to the method, synthesis of second chain cDNA is not needed, chain specificity is directly achieved without other digestionprocesses, operation is easy, and working hours are saved.

The invention provides a method for preparing an rRNA silent RNA library and a reagent or a kit used by the method.

The invention relates to the technical field of biology, in particular to an RNA library preparation method, a sequencing method and a kit. The RNA library preparation method comprises the following steps of performing reverse transcription by taking RNA as a template to generate first chain cDNA, thereby obtaining an RNA/cDNA heterozygote; and adding a first preset sequence to at least one tail end of the RNA/cDNA heterozygote to form an RNA/DNA heterozygote, wherein the RNA/DNA heterozygote is an RNA library, and the first preset sequence is located at at least one tail end of the cDNA chain. The RNA library prepared with the method is simple and rapid to operate, the constructed RNA library can be directly used for sequencing, and the method has no double-stranded cDNA synthesis process, namely no cDNA amplification and enrichment process, so that bias and errors caused by PCR amplification and enrichment can be avoided. Meanwhile, the invention discloses the RNA sequencing method which is used for directly measuring cDNA sequence information to obtain RNA sequence information. The invention also discloses the kit for RAN testing, and the kit can be used for constructing the RNAlibrary and sequencing the RNA library.

The invention provides a simple RNA library building method which is characterized by comprising the following steps: (1) extracting RNA in a sample, adding a reverse transcription primer and an rRNA reverse transcription hindering probe, and fragmenting; (2) carrying out RNA reverse transcription to obtain DNA/RNA hybrid double strands; (3) linker connection: connecting a blunt-end double-chain DNA linker with adenylation modification to the 3'end of the DNA/RNA hybrid chain cDNA by using a T4 DNA ligase mutant K159L; and (4) library amplification and recovery. According to the simple RNA library building method, the principle that DNA ligase mutants K159L can be efficiently connected with DNA/RNA hybrid chains is utilized, only five steps of RNA fragmentation, reverse transcription, linker connection, library amplification and magnetic bead recovery are needed, the RNA library building process is greatly simplified, and consumed time is greatly shortened. In combination with a technology for rapidly removing rRNA by using an rRNA reverse transcription hindering probe, rRNA removal and RNA library establishment can be completed in one tube. The whole process only needs 2 hours, the operation is simple, the RNA loss is small, the cost is low, and the method is very suitable for automatic RNA library building and low-abundance RNA library building.

The invention provides a probe composition, which comprises 20 probes, for hindering Globin mRNA reverse transcription, and discloses application of the probe composition. According to the invention, reverse transcription of a target RNA is inhibited with high efficiency and high specificity during synthesis of one-chain cDNA by using a reverse transcription hindering probe method, so that the target RNA is hindered from participating in a downstream library building process. The probe can specifically recognize and bind to the human globulin RNA and hinder the reverse transcription of the globulin RNA so as to realize the purpose of removing the globulin RNA in the RNA library building process, 99.5% or above of Globin mRNA sequences in the blood sample RNA can be effectively removed in the reverse transcription process, and the probe has the advantages of being easy in operation (one step) and short in time consumption (2 min), and is very suitable for large-scale industrial automation.

The present invention is directed to the method for selecting an RNA molecule that binds to a target molecule and a kit for carrying out the method. This method includes: providing a pool of oligonucleotide complexes that each comprise a ds-DNA molecule and an RNA molecule, the ds-DNA molecule comprising a first DNA strand at least partially annealed to a first region of the RNA molecule, whereby a second region of the RNA molecule is free to adopt a secondary structure; exposing the pool to a target molecule and allowing the second region of the RNA to bind the target molecule; and selecting from the pool one or more oligonucleotide complexes comprising an RNA molecule having the second region bound to the target molecule.

A chip is constructed through a full-flow full-automatic digital micro-fluidic library, full-flow library construction of a sample is included on a single chip, and the chip comprises a low-temperature area used for keeping effectiveness of a reagent in the waiting process; the system comprises: a temperature change zone which is used for providing temperature conditions required by each reaction in library construction; and liquid storage and distribution areas 2 which can be used for respectively distributing washing liquid, magnetic bead solution and eluent drops. A user only needs to load a sample to the chip to realize full-process DNA or RNA library construction.