2350 results about "Reverse primer" patented technology

In one aspect, the present invention provides methods for amplifying a microRNA molecule to produce DNA molecules. The methods each include the steps of: (a) using primer extension to make a DNA molecule that is complementary to a target microRNA molecule; and (b) using a universal forward primer and a reverse primer to amplify the DNA molecule to produce amplified DNA molecules. In some embodiments of the method, at least one of the forward primer and the reverse primer comprise at least one locked nucleic acid molecule.

The invention discloses a method and primers for detecting mi ribonucleic acid (miRNA) and application of the method. The method comprises the following steps of: performing reverse transcription on the miRNA in a sample by using a reverse transcription primer formed by specific basic groups and Oligo (dT); and performing real-time polymerase chain reaction (PCR) quantitative detection on the miRNA by using a specific forward primer, a general reverse primer and a general probe. The invention has the characteristics that: the sensitivity and the specificity of the method are obviously higher than those of the conventional method; high-throughput analysis can be performed; and the method is simply and quickly operated, is low in cost, and can be widely used for early diagnosis and prediction of critical diseases such as tumors and the like.

The invention relates to the field of molecular biology and aims to provide an ARMS-qPCR (Allele Refractory Mutation System-quantitative Polymerase Chain Reaction) detection kit for KRAS (Kirsten Rat Sarcoma Viral Oncogene Homolog) gene mutation subtype and a detection method. The kit comprises a qPCR hybrid reaction solution, a locked nucleic acid retardant probe, a reference primer, an ARMS primer and a positive control sample, wherein the qPCR hybrid reaction solution comprises a PCR buffer solution, dNTPs (Deoxynucleotide Triphosphates), MgCl2, GoldStarbest Taq enzyme, a universal PCR reverse primer and a universal TaqMan probe. The kit provided by the invention can be used for rapidly and accurately detecting specific locus mutation of KRAS genes in various cancer tissues with high sensitivity, has high sensitivity, and can be used for detecting genome DNA with various tissue origins, specially free DNA segments adopting cell-free systems, such as blood serum and blood plasma, orother body fluid origins, wherein the genome DNA is derived from cell systems. Compared with direct sequencing and other mutation detection technologies, the kit and the detection method thereof havethe advantages of strong specificity, high sensitivity, simplicity and rapidness in operation, high throughput, safety, definiteness and objectivity in result identification and the like for detecting the KRAS gene mutation.

The present invention is directed to methods, reagents, kits, and compositions for detecting target polynucleotide sequences, especially small target polynucleotides such as miRNAs, between two samples. A pair of linker probes can be employed in two different reactions to query a particular species of target polynucleotide. A pair of detector probes, a single forward primer specific for the target polynucleotide, and a reverse primer can be employed in an amplification reaction to query the difference in expression level of the target polynucleotide between the two samples. In some embodiments a plurality of small miRNAs are queried with a plurality of linker probes. The plurality of queried miRNAs can then be decoded in a plurality of amplification reactions.

Methods for detection of nucleic acids such as a cDNA copy of an mRNA are disclosed. The methods comprise using a PCR to form a preamplification product which comprises cDNA sequence as well as primer target sequences and a detection probe sequence, which are introduced by the forward and reverse primers. In a second PCR, preamplification product is amplified using universal primers which hybridize to the primer target sequences or their complements. Amplification can be detected using a detection probe that hybridizes to the detection probe sequence or its complement.

The invention discloses a primer applied to amplicon sequencing library construction and a method for constructing an amplicon sequencing library. The primer consists of a forward primer and a reverse primer, and the forward primer and the reverse primer comprise a joint sequence, a sequencing primer sequence and a target fragment amplification primer sequence from a sequence from the 5' end to the 3' end. According to the primer provided by the invention, the joint sequence, the sequencing primer sequence and the target fragment amplification primer sequence are integrated on a pair of primers, so that library construction can be finished in one step by utilizing the primer. The sequencing library quality and library construction efficiency are improved, the constructed amplicon sequencing library can perform high-throughput sequencing due to the joint sequence and the sequencing primer sequence used on a conventional sequencing platform by utilizing a common reagent for on-board sequencing, and the phenomena that an extra sequencing primer is provided and the mixed sequencing primers of the PHiX library are changed are avoided.

The invention discloses a method and a device for gene sequencing of a plurality of mixed DNA (Deoxyribonucleic Acid) or RNA (Ribonucleic Acid) sequences, which is mainly characterized by adding random labels at two ends of each DNA or RNA template sequence before establishing a bank. The method comprises the following steps of: mixing a first forward primer containing the random label and a connector, a first reverse primer and the DNA sequences, performing multiple PCR (Polymerase Chain Reaction) amplification on two PCR circulations, and purifying the PCR product to obtain a first DNA product; mixing the first DNA product, a second forward primer containing a sample indexing sequence and the connector, and a second reverse primer, performing PCR reaction to obtain a second PCR product; purifying to obtain a second DNA product; and sequencing the second DNA product to obtain a sequencing result of each DNA sequence. According to the method disclosed by the invention, by introducing the random labels to each DNA molecule, the sequencing precision is improved, the error rate of the sequencing is obviously reduced, and the copy number of each DNA is precisely detected.

The invention provides an inherited metabolic disease screening method and a reagent kit. The method includes the steps that following libraries are built, according to each encoding sequence of inherited metabolic disease associated disease-causing genes and the principle of sequence reverse complement, from 5' to 3', a probe sequence with the length being 120 bp starts to be designed from the first basic group, and besides, 60 bp superposition exists between every two adjacent probe sequences; a TAGGTGTGTAGGCGC sequence and a GTCAGCTAGTACGCA sequence are added to the 5' end and the 3' end of each probe sequence respectively; by the adoption of the oligonucleotide in-situ synthesis technology, large-scale synthesis of oligonucleotides is carried out on a chip; the oligonucleotides on the chip are eluted through ammonia water and dissolved in water to form an oligonucleotide mixture; through the PCR method, forward primers (TTAGATAGGTGTGTAGGCGC) and reverse primers (TAAGGTGCGTACTAGCTGAC) provided with biotin labels at the 5' ends are adopted, the oligonucleotide mixture is amplified, and an inherited metabolic disease associated disease-causing gene DNA probe library with the biotin labels is formed.

The invention belongs to the technical field of food quality and safety detection and particularly relates to a method for rapidly detecting pork, beef, mutton and chicken components in food at the same time through animal genomic DNA (deoxyribonucleic acid) extraction, primer design and UP-M-PCR (universal primers-multiplex-PCR). The four meat components can be distinguished rapidly at the same time according to differential sites of mitochondrial cytochrome b of the animal by using the forward primer sharing and reverse primer specificity strategy and an M-PCR system including five primers. The result shows that the method has the advantages that the detection limit can be up to the pictogram level, the components of the reaction system are free from cross interference and the meat products on market can be detected, verified and distinguished accurately by sampling 80 meat products randomly according to the specificity of the four target meat components. In a word, the invention provides a specific, sensitive and practical multiplex PCR method for rapidly screening four common meat components in food at the same time.

The invention relates to the technical field of gene detection, in particular to a CRISPR (Clustered regularly interspaced short palindromic repeats)/Cas12 one-step nucleic acid detection method and a2019-nCoV detection kit. The 2019-nCoV detection kit comprises crRNA, Cas protein, a primer, a buffer system and single stranded DNA reporter molecules; the primer is obtained as follows: 5'-TTTN-3'sequence is sought in a to-be-detected target molecule area, a forward primer is designed in the position near 5' area 0-200bp, a reverse primer is designed in the position near 3' area 25-200bp, theobtained primer is subjected to chemical modification to prevent decomposition of DNA enzyme or Cas12 protein after activation. The method has the benefits that compared with existing PCR-based nucleic acid detection technologies, the nucleic acid detection method and the 2019-nCoV detection kit can allow synchronous amplification and detection, thus, operation is more convenient.

The invention discloses a loop-mediated isothermal amplification (LAMP) kit for rapidly detecting vibrio parahaemolyticus. The LAMP kit is composed of LAMP reaction liquid, a standard positive template and a negative quality control standard substance. The LAMP reaction liquid contains a Bst DNA polymerase big fragment, a primer, LAMP10*buffer, dNTPs solution, MgSO4 solution and glycine betaine. The primer is divided into a forward primer and a reverse primer. The LAMP kit has the advantages of being good in specificity, high in sensitivity, rapid and convenient, high in repeatability, capable of judging results by using eyes and the like, can conduct rapid qualitative detection on vibrio parahaemolyticus in industrial foods, and can replace continuously-used traditional culture method and serological diagnosis method.

The invention relates to a PCR primer for a human breast cancer susceptibility gene BRCA1 and BRCA2 coding sequence based on a NGS technology and application thereof. The PCR primer for the human breast cancer susceptibility gene BRCA1 and BRCA2 coding sequence comprises at least one capturing primer pair, and sequences of a forward primer and a reverse primer of each capturing primer pair respectively comprise a specific sequence and a linker sequence connected with a terminal 5' of the specific sequence. The PCR primer used for amplifying the human breast cancer susceptibility gene BRCA1 and BRCA2 coding sequence based on the NGS technology and application thereof have the advantages that experiment operations related in the whole method are simple, only a PCR reagent and a primer combination are related, cost is low, and a ditag sequencing linker sequence is introduced for distinguishing different samples, so that high throughput sample sequencing detection can be realized, and gene detection support can be effectively provided for risk assessment on human breast cancer and other BRCA susceptible gene-related hereditary tumours or targeted medication specific to BRCA mutation.

Methods and compositions useful in the detection and identification of species of Candida are disclosed. These species include Candida albicans, Candida glabrata, Candida parapsilosis, and Candida tropicalis, each of which is a causative agent for vaginal candidiasis. The compositions of the invention are combinations of oligonucleotides. These oligonucleotides include pairs of forward and reverse primers for polymerase chain reactions, wherein each primer pair is capable of priming the synthesis of an amplicon specific to one of Candida albicans, Candida glabrata, Candida parapsilosis, and Candida tropicalis, but preferably is not capable of priming the synthesis of an amplicon specific to any of the other three species. In preferred embodiments, the forward primers of the primer pairs have identical sequences, while each reverse primer of the primer pairs has a unique sequence relative to all of the other reverse primers; or the reverse primers of the primer pairs have identical sequences, while each forward primer of the primer pairs has a unique sequence relative to all of the other forward primers. These unique primer sequences account for the species specificity of the resultant amplicons. The oligonucleotides also include probes capable of detecting these amplicons, and sequencing primers for determining, in primer extension reactions, the nucleotide sequences contained within the amplicons. In preferred methods of the invention, a biological sample is tested for the presence of at least one isolate of Candida albicans, Candida glabrata, Candida parapsilosis, and Candida tropicalis by isolating nucleic acid from the sample, attempting a polymerase chain reaction in a mixture containing this nucleic acid and a plurality of these primer pairs, ascertaining whether any amplicon is produced in the mixture using an oligonucleotide probe, and determining the sequence of any resultant amplicon using the sequencing primers. The detection of an amplicon indicates that the sample contains at least one isolate of Candida albicans, Candida glabrata, Candida parapsilosis, or Candida tropicalis, and the nucleotide sequence data is used to determine which of these four Candida species is present.

A real-time isothermal recombinase-polymerase amplification detection kit for African swine fever viruses is disclosed. A forward primer sequence for detecting the African swine fever viruses through a method provided by the kit is shown as SEQ ID NO:1, a reverse primer sequence is shown as SEQ ID NO:2 and a probe sequence is shown as SEQ ID NO:3. A real-time isothermal recombinase-polymerase amplification method provided by the invention for ASFV detection is simple and convenient in operation, rapid in reaction and low in detection cost, can be used for ASFV detection in a laboratory and on site, particularly ASFV detection in quarantine ports, airports and epidemic disease outbreak sites, and provides a novel and reliable technique support for ASF control in China.

The invention discloses an FAdV-4 PCR detection kit and detection method. The kit comprises protease K, a lysing solution, sodium acetate, saturated phenol, chloroform, isoamylol, anhydrous ethanol and sterile distilled water, and is characterized by comprising 2*TaqPCR Mix, a sense primer and a reverse primer, wherein the sequence of the sense primer is shown as SEQ ID No.1, and the sequence of the reverse primer is shown as SEQ ID No.2. The kit can be used for detecting FAdV-4. The method for detecting FAdV-4 by adopting the kit is also provided, and FAdV-4 can be detected quickly and specifically.

The present invention relates to a detection chip for performing gene detection to various vibrio and its detection and applications. The invention provides 16S rRNA sequences corresponding to each vibrio of vibrio anguillarum, vibrio harveyi, vibrio alginolyticus, vibrio parahaemolyticus, brilliant vibrio and Fisher vibrio; heat shock protein hsp60 probe sequence; virulence gene probe sequence; 16S rRNA forward primer sequence; 16S rRNA reverse primer sequence; heat shock protein hsp60 forward primer sequence; heat shock protein hsp60 reverse primer sequence; virulence gene forward primer sequence and virulence gene reverse primer sequence. The present invention has specific, sensitive and high-throughput features, can simultaneously detect six kinds of bacteria virulence genes, and the invention will effectively guide the production as an important disease early-warning detection method used in clinical diagnosis of aquatic animals.

The invention discloses an InDel molecular marker for identifying clubroot-resistant QTL (quantitative trait locus) located on Chinese cabbage A03 chromosome and application thereof. The invention provides a method for identifying or auxiliarily identifying whether a Chinese cabbage is a clubroot-resistant Chinese cabbage, which comprises the following steps: carrying out amplification by using genome DNA (deoxyribonucleic acid) of the Chinese cabbage to be identified as a template, a single-stranded DNA disclosed as SEQ ID No.2 as a forward primer and a single-stranded DNA disclosed as SEQ ID No.3 as a reverse primer; detecting the size of the amplification product; and determining whether the Chinese cabbage to be identified is a clubroot-resistant Chinese cabbage according to the size of the amplification product: if the amplification product of the Chinese cabbage to be identified contains a 201bp strip, the Chinese cabbage to be identified is a clubroot-resistant Chinese cabbage or candidate clubroot-resistant Chinese cabbage; and if the amplification product of the Chinese cabbage to be identified does not contain any 201bp strip, the Chinese cabbage to be identified is a non-clubroot-resistant Chinese cabbage or non-candidate clubroot-resistant Chinese cabbage.

The invention discloses an onion cytoplasm male sterility SCAR marker, wherein the length of the specific fragment of the SCAR marker is 339bp, and the nucleotide sequence thereof is shown as SEQ ID No.2. The invention further discloses a primer of the SCAR maker, wherein the forward primer is Zt339-u:5'-GTTCTCAAGCAGATTCCGCAC-3', and the reverse primer is Zt339-d:5'-AGGACCAAACCGAGAGTGAGC-3'. Quick and accurate selection for onion cytoplasm fertility can be realized by using the obtained SCAR marker, thereby quickening the seed selection for new breed strain of onion cytoplasm male sterility, and establishing novel onion coenospecies parent selection system; first-filial generation breeds with independent intellectual property are selected and bred, thereby solving the difficult problems that conventional seeds are mainly used in the current production in China and large sums of foreign exchange is used for buying foreign coenospecies.

The invention discloses a sturgeon sexuality difference molecular marker and an application thereof; the marker has the nucleotide sequence shown in SEQ ID NO.1; a DNA sequence shown in the SEQ ID NO.1 is detected by PCR primers, and according to a PCR detection result, the sturgeon sexuality is identified; a forward primer F of the PCR primers is 5'-CACACTGATGCTCTACATGT-3', a reverse primer R is 5'-AGGCTGGACAGTGATGCTGT-3', and the forward primer F and the reverse primer R are respectively shown in SEQ ID NO.2 and SEQ ID NO.3. The invention provides a nucleic acid fragment for detecting the sturgeon sexuality and the PCR primers for detecting the molecular marker related to sturgeon; the molecular marker is not limited by the age of the sturgeon, is accurate and reliable, is easy to operate, and has important application value in production.

The invention relates to feature sequences and a molecular specificity tag primer of a pair of high-specificity feature sequences of carya illinoensis variety Nacono, a molecular specificity tag primer, and a method capable of being used for fast identifying the carya illinoensis variety Nacono. The molecular specificity tag primer has the sequence that a forward primer is 5'-GTCACTTCCCTTTCTCGGCA-3', and a reverse primer is 5'-CCCCGGGTGCAGGTATAAAA-3'. The molecular specificity tag primer provided by the invention can be used for performing fast early-stage identification on the carya illinoensis variety Nacono; the method is simple, fast and accurate, and belongs to an irreplaceable molecular technique for distinguishing the carya illinoensis variety through appearance features.