143 results about "Asymmetric PCR" patented technology

The invention discloses a kit for quickly detecting 15 pneumonia pathogenic bacteria. The kit can detect streptococcus pneumoniae, staphylococcus aureus, haemophilus influenzae, mycoplasma pneumoniae, pseudomonas aeruginosa, baumanii, enterococcus faecalis, enterococcus faecium, klebsiella pneumoniae, escherichia coli, enterobacter cloacae, stenotrophomonas maltophilia, burkholderia cepacia, legionella pneumophila and chlamydia pneumoniae which cover clinically common pneumonia pathogenic bacteria difficult to culture. 16S rDNA and specific gene sequences corresponding to the pneumonia pathogenic bacteria are detected by combining gene chips with multiple asymmetric PCR reactions, and the categories of the bacteria in a to-be-detected sample are identified in genus and species. The kit makes up for the defect that current clinical detection of pneumonia pathogenic bacteria is not in time or comprehensive and a novel detection means for early diagnosis and early treatment of patients suffering from pneumonia is provided.

A high-throughput method for rapid detection of virus pathogens comprises the following steps of: (1) designing probes and spotting on a chip to obtain an oligonucleotide chip; (2) designing and synthesizing primers to obtain primers corresponding to a detected pathogen; (3) performing synchronous asymmetric PCR amplification to a detected sample with the primers corresponding to the detected pathogen to obtain a single-stranded DNA product specifically complementary with the oligonucleotide; (4) labeling a fluorescent substance on the single-stranded DNA product to obtain a fluorescent-labeled single-stranded DNA product; (5) hybridizing with the oligonucleotide chip, and cleaning the chip; and (6) scanning with a fluorescent scanner to obtain virus detection and analysis results. The invention solves the time-consuming, labor-consuming, low sensibility and specificity and inaccurate detection result problems in the detection method of virus causing porcine epidemic diseases in the prior art. The invention can be used for rapid, accurate and efficient detection of multiple genes.

The invention discloses a reagent kit used for detecting CYP2C19 genotypes. Allelic genotypes of CYP2C19*2(681G/A) and CYP2C19*3(636G/A) of a CYP2C19 gene are detected by designing a specific primer pair and a fluorescent probe. Asymmetric PCR and the fluorescent probe melting curve analysis technology are combined, different genotypes are judged through melting peaks of specific temperatures, detection of six genotypes related to CYP2C19*2 and CYP2C19*3 can be achieved in one-tube PCR, subsequent processing is not needed, the possibility of reactant pollution is avoided to the largest extent, operation is easy, consumed time is short, specificity is good, accuracy is high, and results are easy to interpret.

The invention discloses a primer and probe composition for detecting polymorphism of human CYP2C9 and VKORC1 genes, a kit and application. The primer and probe composition comprises three pairs of specific primers for amplifying CYP2C9*2, CYP2C9*3 and VKORC1 sites, and three specific fluorescent probes. The primers and the probes, disclosed by the invention, have high sensitivity, strong specificity and strong anti-interference capability; a manner combining an asymmetric PCR (Polymerase Chain Reaction) amplification and fluorescent probe melting curve analysis technologies is used for detecting the gene polymorphism; different gene types can be effectively distinguished according to the quantity and Tm value of a melting peak; a result is convenient, clear and objective to judge and read.Single-tube sampling can be used for simultaneously detecting 6 mutation types of 3 gene sites; the primer and probe composition is simple and convenient to operate and the detection efficiency is improved; a large batch of samples can be detected and clinical operation is facilitated.

The invention discloses a nested asymmetric PCR reagent kit for detecting alpha 2 globin gene point mutation. The reagent kit comprises a nested asymmetric PCR amplification primer, a fluorescent probe, a quenching probe, an LADNA polymerase and the like. The alpha-thalassemia point mutation genotype of a detected sample is detected by virtue of specific amplification of five point mutation destination fragments WS, QS, CS, CD30 and CD31 of the human alpha 2 globin gene and molecular hybridization and unwinding analysis of a specific fluorescent probe. The reagent kit has good sensitivity and accuracy to wild type and mutation type of alpha-thalassemia five point mutation positions WS, QS, CS, CD30 and CD31, has good repeatability and stability, and is totally suitable for clinical detection of alpha-thalassemia point mutation.

The invention relates to the field of nucleic acid molecule detection and particularly discloses a multiplex ligation-dependent probe amplification (MLPA) long probe preparation method, a transgene corn MLPA long probe, a transgene corn MLPA short probe and a transgene corn MLPA detection method. The MLPA long probe preparation method can be carried out by adopting conventional laboratory technology of asymmetric polymerase chain reaction (PCR) amplification, enzyme restriction, gel electrophoresis, cut gel recovery and the like. Compared with the existing preparation method, the method has the advantages that the operation is simple, the cost is low, and the operation can be realized in ordinary laboratories. The problem of limited application of the MLPA detection method caused by difficult long probe preparation and high cost is solved. The transgene corn MLPA long probe and the transgene corn MLPA short probe can be used for detecting transgene corn, and the basis is provided for the high-flux MLPA detection of the transgene corn. The transgene corn MLPA detection method carried out on the basis has good expansion performance and high specificity, a simple, convenient, effective and reliable high-flux detection method is provided for the transgene corn detection, and the method is particularly suitable for being used for departments such as inspection and quarantine departments and the like.

The invention discloses primers, probes and a method for detecting plasmodium, belonging to the technical fields of biological detection and biological chemistry. The adopted technical scheme is as follows: the invention provides a method for detecting plasmodium, universal primers SEQ ID No: 1-2 for PCR (Polymerase Chain Reaction) amplification of gene sequences of plasmodium in the method, and probes SEQ ID No: 3-6 for detecting plasmodium. The primers, probes and method have the advantages that (1) the universal primers for PCR amplification of the gene sequences of plasmodium and the specific nucleic acid probes are high in sensitivity and good in accuracy; (2) due to the adoption of an asymmetric PCR method and liquid chip combined technology, the yield of a single strand of a biological marker is increased so that the hybridization and combination efficiencies of PCR products and microspheres coupled with the specific nucleic acid probes are increased; the method has the advantages of high-flux test, high specificity and sensitivity, stable result, good repeatability, simplicity in operation, high detection speed and capability of rapidly detecting plasmodium.

The invention relates to a kit for quickly detecting a drug resistance gene of pneumophila pathogenic bacteria, which comprises a gene chip capable of detecting 24 main drug resistance genes of pneumophila pathogenic bacteria and a reaction system for multiple asymmetric PCR reactions. The 24 drug resistance genes are derived from aminoglycosides, quinolones, extended spectrum beta-lactamases (ESBLs), cephalosporins (AmpC), carbapenems and drug resistance genes with vancomycin resistance and methicillin resistance causing membrane permeability transition. The kit can be used for directly detecting drug resistance genes of pneumophila pathogenic bacteria in clinical samples, is simple and quick to operate, does not need culture or drug sensitive tests, gains valuable time for reasonable application of antibiotics to a great extent, and is worthy of clinical popularization and application.

The invention relates to a method for preparing a visual classical swine fever virus (CSFV) gene detection reagent based on G4DNAzyme coloration. The method comprises the following steps: selecting cells infected with viruses, after freeze thawing and lysing, adopting a gene extraction kit for extracting a target gene and obtaining cDNA after carrying out reverse transcription and inactivation onMoloney murine leukemia virus (MMLV) reverse transcriptase; adding the cDNA to an asymmetric polymerase chain reaction (PCR) system and obtaining an asymmetric PCR product through degeneration, annealing and extension amplification for 50-100 cycles; and adding upstream and downstream probes and the asymmetric PCR product to G4DNAzyme coloration reaction buffer, and after degeneration and annealing, adding Hemin, ATBS and H2O2 to carry out coloration reaction and observing whether macroscopic green color appears, thus judging whether CSFV infection exists. The method has the beneficial effects of high detection speed, accuracy, stability, good repeatability, simple and easy-to-operate detection steps, capability of directly observing the coloration reaction with naked eyes, intuitionisticresults and low cost.

The invention discloses a method for quickly identifying a food pathogenic bacteria subtype based on an asymmetric polymerase chain reaction (PCR) combined test strip platform and a kit, and belongs to the technical field of biological detection. The method comprises the main steps of: (1) extracting food pathogenic bacteria subtype DNA; (2) designing an amplification primer and a nucleic acid probe sequence; (3) performing amplification reaction based on asymmetric PCR; (4) preparing a nanogold probe; (5) preparing a colloidal gold nucleic acid test strip; (6) detecting a sample. According to the method, food pathogenic bacteria in food samples can be quickly, specially, sensitively, qualitatively and quantitatively detected and the special subtype of the pathogenic bacteria is determined; the probe is simply designed, the operation steps are simple and short, the product is a single chain, and the method is easy to detect and convenient to popularize.

The invention relates to a visual classical swine fever virus (CSFV) gene identification and detection reagent based on G4DNAzyme coloration and a preparation method thereof. The reagent is asymmetric (polymerase chain reaction) PCR reaction liquid. The 100mul reaction liquid comprises: 2mul of positive primerW3(+) (0.4-4mumol/L) and 2mul of negative primer W3(-) (20mumol/L), 10mul of PCR solution (10*buffer), 8mul of MgCl2 solution (2.5mmol/L), 2mul of dNTPs solution (10mmol/L), 2mul of TaDNA polymerase (2U) and balance of sterile double distilled water. A sequence of the positive primer W3(+) in the asymmetric PCR reaction liquid is: 5'-gcgcgggtaacccgggat-3', and the sequence of the gemeative primer W3(-) is 5'-GTCCAACTGTGGACGTCAGGAA-3'. The method has the beneficial effects of high detection speed, accuracy, stability, good repeatability, simple and easy-to-operate detection steps, capability of directly observing the coloration reaction with naked eyes, intuitionistic results and low cost.

The invention relates to a method for detecting gene chips of SS2 (streptococcus suis serotype 2) and an application method thereof, which can effectively solve the problems that the existing detection equipment and method are long in time consumption and large in investment. The technical scheme of the invention is as follows: a method for detecting gene chips of SS2 is implemented through designing and synthesizing a primer and a probe, dissolving the synthesized probe by using sterilized water, and carrying out contact sample application on an aldehydized substrate by using a gene chip sample application instrument according to a preset program. The application method comprises the following steps of: extracting the genomic DNA (deoxyribonucleic acid) of SS2 to be detected; preparing a PCR (polymerase chain reaction) product for hybridization by using an asymmetric PCR, and hybridizing the prepared PCR product with a prepared gene chip; and after the obtained product is washed and dried, placing the chip on a laser confocal scanner to scan the chip, and synthesizing results. The methods disclosed by the invention are simple and easy to operate; steps of carrying out hydration treatment and pre-hybridization on chips subjected to sample application are omitted, and the hybridization is implemented just through half an hour, thereby greatly saving the time; and the signal strength can be achieved by using a probe concentration of 5mu m/L, therefore, the detection cost is low, and the methods can be used for large-scale detection.

The present invention relates to a primer probe system, a method and a kit for detecting epidermal growth factor receptor exon 19 and 21 mutations. According to the method, an asymmetric PCR technology, a nucleic acid isothermal amplification technology and a fluorescence detection technology are organically integrated, wherein the asymmetric PCR amplification technology and special primers are adopted to obtain a lot of single-stranded DNA so as to overcome disadvantages of low efficiency linear amplification of 3WJ (an isothermal digestion nucleic acid detection technology), and specificity and simplicity of the 3WJ technology are adopted, such that a reaction temperature can be controlled at about 30 DEG C, enzyme activity reduction can not be generated, expensive and precise temperature control equipment is not required during a detection process, and discrimination can be achieved only through the simple fluorescence detection instrument with the special probe design. According to the present invention, advantages of rapidness, simpleness, specificity, sensitivity, and the like are provided.

The present invention relates to compositions and methods for nucleic acid based diagnostic assays. In particular, the present invention provides probes and non-amplifiable controls for asymmetric PCR and other amplification modalities. In some embodiments, the present invention provides probe design criteria for probes for use in amplification/detection assays. Further embodiments of the present invention provide non-amplifiable controls for use in generating reference probe signal ratios in amplification detection assays.

Provided herein is a method for detecting the presence of a COVID-19 virus in a human sample or an environmental sample having one or more viruses and bacterial pathogens. Samples are processed to obtain total nucleic acids. A combined reverse transcription and asymmetric PCR amplification reaction is performed to obtain fluorescent labeled COVID-19 virus specific amplicons. The amplicons are detected by microarray hybridization near the lowest limit of detection. Also provided is a method for detecting concurrently with COVID-19 virus, the presence of respiratory disease-causing pathogens including viruses, bacteria and fungus in a single assay using the above method.

The invention discloses a screening library of nucleic acid aptamers, belonging to the technical field of bioanalysis and bioengineering. The screening library comprises the following specific nucleotide sequences: 5'-ACCGACCGTGCTGGACTCT(N40)ACTATGAGCGAGCCTGGCG-3' as the library, 5'-ACCGACCGTGCTGGACTCT-3' as the forward primer, and 5'-CGCCAGGCTCGCTCATAGT-3' as the reverse primer. According to the invention, the library has short fixed sequences with the length being close to the minimum length and long random sequences, and the diversity of single-chain oligonucleotides in the library is fully guaranteed; the unique design of the fixed sequences (primer sequences) in the library can conduct PCR amplification at high annealing temperature, can effectively inhibit non-specific products and does not influence the amplification of target products, which is proved in symmetric PCR amplification, asymmetric PCR amplification and real-time fluorescent quantitative PCR amplification. The random single chain oligonucleotide library provided by the invention has excellent performance and provides guarantee for successfully screening nucleic acid aptamers of bio-target.

The invention discloses a micro array chip to check 45 gene locus of mitochondria diabetes, which comprises the following steps: choosing aldehyde slide as carrier; designing primer and probe; distributing and controlling chip dot matrix; distributing and controlling dot matrix of monitoring system and testing system; composing the monitoring system with negative contrast and parallel contrast of base point of discontinuity; setting the testing system as wild-type and saltant probe of mtDNA 45 site; setting each chip incorporates 1-3 0.04cm2 sampling point matrix, 90 trips probe of each matrix and 324 sites. The operation is simple, which can be used to check diabetes patient and high risk group.