105 results about "Restriction fragment length polymorphism" patented technology

This invention relates in general to a method for molecular fingerprinting. The method can be used for forensic identification (e.g. DNA fingerprinting, especially by VNTR), bacterial typing, and human/animal pathogen diagnosis. More particularly, molecules such as polynucleotides (e.g. DNA) can be assessed or sorted by size in a microfabricated device that analyzes the polynucleotides according to restriction fragment length polymorphism. In a microfabricated device according to the invention, DNA fragments or other molecules can be rapidly and accurately typed using relatively small samples, by measuring for example the signal of an optically-detectable (e.g., fluorescent) reporter associated with the polynucleotide fragments.

The present invention relates to a method for detecting and differentiating PCV infections in a biological sample taken from a pig which involves amplifying a fragment from an extracted nucleic acid; digesting the fragment with a suitable restriction enzyme such as the unique NcoI restriction enzyme; forming a restriction fragment length polymorphism pattern; and then detecting the presence or absence of a PCV isolate. The invention further concerns the new oligonucleotide primers for differentiating PCV infections comprising a nucleotide sequence selected from the group consisting of MCV1 having a nucleotide sequence set forth in SEQ ID NO:1 and MCV2 having a nucleotide sequence set forth in SEQ ID NO:2. Moreover, this invention provides a novel kit for detecting and distinguishing PCV infections that includes the new oligonucleotide primers and the suitable restriction enzyme.

The invention discloses an SNP (Single Nucleotide Polymorphism) marker related to the litter size of a sow and application thereof. The SNP molecular marker provided by the invention is positioned on G+701C and T+4578C sites of a GDF2 (Growth Differentiation Factor 2). By designing the primers, the two obtained sequences are respectively positioned on Exons 1 and 2 of the gene GDF2 of the sow, the 701bp of the gene GDF2 (ENSSSCG00000010375) sequence recorded in the Ensemble database has one G701-C701 base mutation and results in the change (Ala-114-Pro) of the amino acid, and the 4578bp has one T4578-4578C base mutation which is a synonymous mutation. An RFLP-PCR (Restriction Fragment Length Polymorphism-Polymerase Chain Reaction) method is used for researching the polymorphism of the site. The invention provides a new marker for molecular marker-assisted selection of sows.

The present invention relates, in general, to the genetics of viruses. In particular, the present invention provides methods of distinguishing between serotypes of avian infectious bronchitis virus based on restriction fragment length polymorphisms derived from the region of the S1 gene of IBV, peptides derived from the restriction fragments, related primers for polymerase chain reaction, and certain restriction length polymorphism patterns.

The invention relates to oligo nucleotide for differentiating fins of different species of sharks, a method for detecting differentiating fins of different species of sharks by polymerase chain reaction and restriction fragment length polymorphism analysis (PCR-RFLP), a detection kit for differentiating fins of different species of sharks by the PCR-RFLP, and application of the oligo nucleotide in identifying fins of different species of sharks. The oligo nucleotide primer, the detection kit and the PCR-RFLP detecting method can simply, quickly, specifically and sensitively detect the fins of different species of sharks.

The invention relates to the field of molecular biology and taxonomy and discloses a PCR-RFLP (Polymerase Chain Reaction-Restriction Fragment Length Polymorphism) rapid detection method for common sturgeons as well as a primer and a kit for the rapid detection method. The PCR-RFLP rapid detection method for the common sturgeons comprises the following steps: firstly, extracting a genome DNA (Deoxyribose Nucleic Acid) of a sample to be detected as a template; secondly, carrying out PCR amplification reaction to obtain a PCR product by taking the genome DNA as the template; thirdly, digesting the PCR product by using restriction endonuclease to obtain a digested product; fourthly, carrying out agarose gel electrophoresis detection on the PCR product and the digested product and identifying species according to electrophoretogram. According to the PCR-RFLP rapid detection method disclosed by the invention, the simplicity in operation is realized; a small amount of fin rays or muscle is needed to be sheared on the basis of ensuring the survival of fingerling; the identification of fingerlings of the common sturgeons is quickly and accurately carried out; the accuracy and the reliability of the identification result are improved; the working efficiency is greatly increased.

The invention discloses a chicken heat resistance-associated molecular marker and an identification method and use thereof. The molecular marker is G-141A which is positioned in a 5' flanking region in a chicken heat stress protein 90-beta gene. In the invention, the polymerase chain reaction (PCR) amplification of the 5' flanking region in the chicken heat stress protein 90-beta gene, the product of the amplification is subjected to sequencing and single nucleotide polymorphism (SNP) screening, the screened SNP is subjected to PCR-restriction fragment length polymorphism(RFLP) in a large population, the obtained typing result and the heat resistance property index of the population are subjected to association analysis, an SNP locus which is associated obviously is initially determined as heat resistance property auxiliary selection molecular marker, and chicken of a GG genotype has high heat resistance in a high-temperature environment.

The invention discloses a PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) method for distinguishing a goose parvovirus from a muscovy duck parvovirus. According to the PCR-RFLP method, NS gene sequence digestion site difference is used for distinguishing the goose parvovirus from the muscovy duck parvovirus. The method comprises the following steps of: extracting DNA (deoxyribonucleic acid), carrying out PCR amplification to obtain an NS gene segment, and carrying out RFLP analysis after EcoRI digestion is carried out. The PCR-RFLP method for distinguishing the goose parvovirus from the muscovy duck parvovirus is simple and high in efficiency and accuracy.

The invention discloses a PCR-RFLP method for quickly detecting the single nucleotide polymorphism (SNP) of a goat Lhx3 gene. The genetic polymorphism is base polymorphism of T or C at a position-5557 of the goat Lhx3 gene. The method for detecting the SNP of the goat Lhx3 gene comprises the following steps of: performing PRC amplification on the goat Lhx3 gene by using the DNA of a goat genome to be detected which comprises the Lhx3 gene as a template and using a primer pair P as primers; and digesting a PCR amplification product by using a restriction enzyme, performing agarose gel electrophoresis on digested segments, and determining the SNP on the position-5557 of a goat according to the result of the agarose gel electrophoresis. The method is easy to operate, quick, low in cost, high in detection precision and convenient to popularize and use.

The invention relates to the field of molecular biology and taxonomy and discloses a PCR-RFLP (Polymerase Chain Reaction-Restriction Fragment Length Polymorphism) rapid detection method for common sturgeons as well as a primer and a kit for the rapid detection method. The PCR-RFLP rapid detection method for the common sturgeons comprises the following steps: firstly, extracting a genome DNA (Deoxyribose Nucleic Acid) of a sample to be detected as a template; secondly, carrying out PCR amplification reaction to obtain a PCR product by taking the genome DNA as the template; thirdly, digesting the PCR product by using restriction endonuclease to obtain a digested product; fourthly, carrying out agarose gel electrophoresis detection on the PCR product and the digested product and identifying species according to electrophoretogram. According to the PCR-RFLP rapid detection method disclosed by the invention, the simplicity in operation is realized; small amount of fin rays or muscle is needed to be sheared on the basis of ensuring the survival of fingerlings; the identification of fingerlings of the common sturgeons is quickly and accurately carried out; the accuracy and the reliability of the identification result are improved; the working efficiency is greatly increased.

The invention discloses a method for fast identifying harmful algae. The method is characterized by comprising the following steps of: a, preparation of experimental algae f/2 and derivative culture media of the experimental algae; b, design and verification of primers; c, obtaining of 18s rDNA fragment of the experimental algae; d, optimization and propagating of (polymerase chain reaction) PCR; e, control experiment of simulated enzyme cutting and practical enzyme cutting; and f, identification of the harmful algae by using restriction fragment length polymorphism (RFLP). As a molecule ecological means for identifying the harmful algae, the method can serve as the supplementary means and auxiliary means of the conventional identification methods. The method establishes a characteristic map based on FELP, standardizes the whole flow, and is favorable for initially identifying the harmful algae fast, easily and conveniently and pre-alarming the outbreak of the red tide of phytoplankton.

The present invention discloses a method for breeding the commercial strains of red feather pink-shell laying hens. It provides a primer pair for identifying the red feather causative mutation homozygous genotype of white leghorn chickens, which is composed of the single-stranded DNA molecule shown in Sequence 2 of the Sequence List and the single-stranded DNA molecule shown in Sequence 3 of the list. After the primer was designed according to the upstream and downstream nucleotide sequences of the 18,288,303^rd deoxynucleotide in the positive-sense strand of the 11^th chromosome as shown in the sequence information of the chicken reference genome Gallus_gallus-4.0 version published in NCBI, the genotype (SNP) at this site is tested through the restriction fragment length polymorphism, the genotype of the site (SNP) was tested through the restriction fragment length polymorphism; the offspring hens obtained by cross breeding the homogenous female parent (the homogenous female parent was obtained through expanded propagation of the white leghorn chickens with the red feather causative mutation homozygous genotype) and the Rhode Island Red rooster as a male parent are all of red feather phenotype, meeting the market demands and enjoying a broad prospect for promotion.

The invention relates to a method for breeding lean-type Chinese Huai pigs in a multi-gene pyramiding manner based on growth traits thereof. The method comprises the following operating steps: 1, carrying out DNA (deoxyribonucleic acid) extraction on the genome of the pig; 2, designing primers, more particularly, designing the PCR (polymerase chain reaction) amplification primers according to the gene sequences of insulin-like growth factor-I (IGF-I), pituitary specific transcription factor-I (PIT-I), liver X receptor alpha (LXR alpha) and melanocortin-4 receptor (MC4R); 3, carrying out the PCR; 4, carrying out restriction fragment length polymorphism (RFLP); and 5, carrying out the correlation analysis on the polymorphism and growth traits of genes. According to the analysis, the method can determine that the single growth rate of the pyramided gene with the gene type thereof being AADDGGFF is the highest one; the method can prevent the genes of other offsprings from being isolated after the selective reservation for breeding, thus achieving the optimal effect of the growth traits of the offsprings on the four gene types; and the method can stabilize the inheritance, particularly lead the genes of the growth traits to become homozygous within one generation, thus accelerating the cultivation of the lean-type Chinese Huai pigs.

The invention discloses a detection method of Chinese simmental cattle carcass and meat quality trait genetic marker, and the method uses DNA pool sequencing and PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) technology for screening and detection of GPAM (glycerol-3-phosphate acyltransferase, mitochondrial) gene function mutation of Chinese simmental cattle. Through the correlation analysis, Chinese simmental cattle carcass and meat quality trait-related SNPs as a molecular genetic marker is found, and is used in the early selection and molecular pyramiding breeding of beef cattle, and breeding and improving of meat use performance of the Chinese simmental cattle can be further accelerated.

This invention proposes a detection method of haplotype comprised of polymophic loci (rs3138774) in (TA)n, rs2077647 in T29C, rs2234693 in Pvu II and (TA)n, T29C, Pvu II and Xba I in susceptibility gene ESR1 relates to liver cancer risk. The methods are PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism), fragment analysis and direct sequencing PCR products. The haplotype is constructed by PHASE program. The invention also relates to the kits detecting susceptibility polymophic locis and using methods. In addition, site(TA)n (rs3138774), T29C(rs2077647) , Pvu II(rs2234693) and the haplotype comprising of (TA)n, T29C, Pvu II and Xba I were related to liver cancer risk. ESR1 is determined as a new susceptibility gene of liver cancer, which provides new genetic consultation content for the liver cancer prevention and control.

The invention discloses a chicken B,D,E-subgroup avian leukaemia genetic resistance related mononucleotide polymorphism molecular marker and application thereof. The molecular marker is TVB gene DNA (deoxyribonucleic acid) sequence SNP-3674C/T, or TVB gene coding sequence SNP-298C/T. The molecular marker can be used for identifying chicken B,D,E-subgroup avian leukaemia genetic resistance characteristics; correspondingly, the molecular marker can be distinguished by a PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) process, and can be used for resistance breeding to control the risk of B,D,E-subgroup avian leukaemia from the source; and the molecular marker has the advantages of high purposiveness and the like, is simple to operate and easy to implement, greatly lowers the screening cost, and thus, has important practical meanings.

The invention relates to a SNP marker related to the tail type trait of fat tail type sheep, and applications thereof, and belongs to the biological field, wherein the SNP marker is located at the 87804589-th base pair of sheep chromosome 8, the sheep with the base of T at the locus has the short tail trait, and the sheep with the base of G has the normal tail length. The invention further provides primers for detecting the SNP marker, a kit containing the primers, and applications of the SNP marker in identification of the tail type trait of lipid tail type sheep and in breeding of Chinese sheep, wherein the SNP marker related to the tail type trait of fat tail type sheep is screened by using a polymerase chain reaction (PCR) and a sequencing technology, and the genotype of to-be-detectedsheep is detected through a restriction fragment length polymorphism (RFLP) method. According to the present invention, with the SNP marker, the breeding of the dominant species with the tail type trait of fat tail type sheep is performed according to the genotype so as to accelerate the breeding process of the fat tail type sheep.

The invention discloses a method for detecting the polymorphism of an ADPRT gene, which is characterized by comprising the following steps: (a) human genomic DNA is used as a template, and a positive primer and a reverse primer of a gene sequence are designed in a region of an ADPRT gene locus; a single basic group is mismatched on the positive primer so as to introduce an enzyme cutting site; and the template genomic DNA is processed by specificity polymerase chain reaction (PCR) amplification; (b) a restriction enzyme is utilized to carry out enzyme cutting on the genomic DNA; and (c) segment size separation is carried out on the ADPRT gene according to agarose gel electrophoresis so as to determine the gene polymorphism of the ADPRT gene. The invention also discloses a kit for detecting the ADPRT gene polymorphism, which comprises a gene polymorphism primer for amplification, dNTPs, DNA polymerase for the PCR reaction, a buffer solution of the DNA polymerase, a restriction enzyme Bsh1236I for restriction fragment length polymorphism (RFLP) and a corresponding buffer solution. The method has simple operation, low cost, intuitional judging result, quick reaction and convenient popularization and application, and the kit is convenient to use.

The invention discloses a PCR-RFLP (Polymerase Chain Reaction-Restriction Fragment Length Polymorphism) method for differentiating duck circovirus from goose circovirus. The PCR-RFLP method is used for differentiating by utilizing Rep protein gene sequence enzyme cutting site difference and comprises the following steps of: extracting DNA (Deoxyribonucleic Acid), carrying out PCR amplification to obtain a Rep protein gene segment, and carrying out RFLP analysis after carrying out XhoI digestion. The PCR-RFLP method disclosed by the invention is simple and higher in efficiency and accuracy.

The invention discloses a PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) method for identifying seven sea cucumber species. The PCR-RFLP method includes the steps of firstly extracting DNA (deoxyribonucleic acid) modules of sea cucumbers; subjecting specificity fragment of a CO I (coenzyme I) gene to PCR amplification to obtain a fragment about 690bp; secondarily subjecting amplified product to restriction enzyme digestion; and finally subjecting the enzyme-digested product to electrophoresis detection. Different sea cucumbers obtain stripes in different numbers and sizes, and selected specificity incision enzymes respectively include: Californian paracanthurus cucumber: SSP I, North Atlantic Ocean cucumaria: EcoR V, apostichopus japonicas: SSP I, thelenota ananas: EcoR V, acaudina molpadioidea: Sca I, isostichopusbadionotus: Pvu II, and actinopyga mauritiana: EcoR V and SSP I. The PCR-RFLP method overcomes the defects that a conventional morphological identification method is prone to affecting in accuracy, is heavy in workload and long in consumption time and the like. The PCR-RFLP method can be completed by only one-time PCR reaction, one-time enzyme digestion reaction and one-time polypropylene gel electrophoresis, and is simple to operate, short in parting time and good in specificity.

The invention discloses an anther culture method for indica japonica hybrid rice. The method comprises the following steps: sampling, identifying a microspore development period, low-temperature pretreatment, young wheatear sterilization, anther inoculation, still dark cultivation at 25+/- 2 DEG C until the diameter of embryonic callus is 2-3mm; carrying out a redifferentiation stage to form complete regenerated plants with haploid or double haploids. The double haploids are good breeding materials, and can be directly used for breeding of new varieties or varietal improvement; the breeding age limit is greatly shortened; the selection efficiency is improved; the double haploids also are ideal materials for molecular markers, such as amplified fragment length polymorphism (AFLP), restricted fragment length polymorphisms (RFLP), randomly amplified polymorphic deoxyribonucleic acid (RAPD) and the like, genetic map drawing, and researches on animal evolution, genetic analysis, plant gene cloning and screening, genetic engineering breeding and the like.