59 results about "Single nucleotide mutation" patented technology

The present invention is directed to various methods for detecting DNA sequence differences, including single nucleotide mutations or polymorphisms, one or more nucleotide insertions, and one or more nucleotide deletions. Labeled heteroduplex PCR fragments containing base mismatches are prepared. Endonuclease cleaves the heteroduplex PCR fragments both at the position containing the variation (one or more mismatched bases) and, to a lesser extent, at non-variant (perfectly matched) positions. Ligation of the cleavage products with a DNA ligase corrects non-variant cleavages and thus substantially reduces background. This is then followed by a detection step in which the reaction products are detected, and the position of the sequence variations are determined.

The invention relates to an SNPs detection method, and concretely relates to a method for detecting specifically amplified products through a one-step PCR reaction and a nucleic acid detection test paper strip in a same reaction system. The method comprises the following steps: nonspecifically amplifying fragments containing SNPs sites through first PCR temperature cycling; specifically amplifying bases containing the SNPs sites through AS-PCR (allele specific polymerase chain reaction); and detecting the specifically amplified products by the nucleic acid detection test paper strip. The method can also be used for detecting mononucleotide mutation. The method which has the characteristics of high sensitivity, strong specificity, simple operation, short time, and rapid and reliable detection result combines respective advantages of proteins and nucleic acids. The invention also relates to applications of a kit in the detection of known drug-resistant gene of pathogens, the mating selection of a donor and an acceptor in organ transplantation, and the discrimination of the identity of a criminal or paternity tests in forensic researches.

The invention discloses primers and a method for quickly detecting Takifugu obscurus young fish sex difference single base mutation. According to the mononucleotide mutant sites on sex difference genes of Takifugu obscurus male and female individuals, a pair of external PCR (polymerase chain reaction) primer and internal PCR primer containing mispaired base for the mutant sites are designed to respectively amplify the sex difference gene sequences. By utilizing the primers, different sexes of DNA (deoxyribonucleic acid) samples of Takifugu obscurus can obtain different amplification results, thereby judging the sex difference of Takifugu obscurus. The method has the advantages of high speed and high accuracy, is simple to operate and suitable for popularization and application, can quickly and accurately identify the sex of the Takifugu obscurus young fish on the basis of extracting genome DNA (deoxyribonucleic acid) of Takifugu obscurus under 1 year, and has important application values in accelerating the Takifugu obscurus unisexual breeding progress and researching the quick PCR detection method in the field of molecular biology.

The invention relates to isolation and cloning of paddy rice photoperiod sensitive genic male sterility gene pms1 and applications thereof. The pms1 gene has only one transcript PMS1T, which is a non-coding long-chain RNA. There are insertion/deletion variation as long as 65 bp and two mononucleotide mutations between different alleles of the gene, wherein the sequence of a dominant allele of the pms1 is represented as the SEQ ID No.4 and the sequence of a recessive allele is represented as the SEQ ID No.3. By means of the insertion/deletion variation and one mononucleotide mutation, two molecular markers of the paddy rice photoperiod sensitive genic male sterility gene pms1 are obtained. The dominant allele of the pms1 can reduce the setting rate of NIL (MH) under long-day condition, while excessive expression on total-length or shortcut PMS1T also can reduce the setting rate of NIL (MH) under long-day condition too, so that by inhibiting the expression of the PMS1T in a photoperiod sensitive genic male sterile line Nongken 58S, the fertility of the Nongken 58S can be recovered. The isolation and cloning of the gene has important utilization value for selective breeding and improvement of a novel paddy rice photoperiod sensitive genic male sterile line.

The invention relates to a method for for detecting mutation and HRD scoring of tumor patient to guide medication, which comprises the following steps: detecting a tumor tissue sample and a control leukocyte sample thereof on the basis of taking a BAM file as an input file, and detecting mutation information of an HRR pathway in panels of different sample types and large-fragment chromosome abnormality HRD caused by gene recombination repair defects, the method for detecting the tumor tissue sample comprises the following steps: 1) detecting mononucleotide mutation of an HRR pathway; 2) detecting the loss of heterozygosity (LOH), telomere allele imbalance (TAI) and large fragment state transition (LST) of the HRR region, wherein the HRD score is equal to the weighted sum of LOH, TAI and LST scores; the invention provides a mutation and HRD scoring medication guidance method for tumor patients. According to the method, a traditional method that the HRD value score is calculated through whole genome detection and is not beneficial to clinical actual effect is optimized, the calculation speed is increased, the detection effect is good, the detection result is accurate, and the requirements of actual application can be well met.

The invention discloses rapid real-time DNA amplifying equipment and a gene mutation detection method. The rapid real-time DNA amplifying equipment comprises a reagent tank and a thermal cycling system, wherein an inserting hole for placing a reaction tube is formed on the reagent tank; the thermal cycling system comprises a heating element and a radiator; the heating element and the radiator are distributed at two sides of the reagent tank; the heating element and the radiator can alternatively be close to or depart from the reagent tank under drive of a drive mechanism. The rapid real-time DNA amplifying equipment disclosed by the invention achieves rapid heating and cooling by controlling the distances from the heating element and the radiator to the reagent tank. The design not only is simple in structure, but also can help a reagent more rapidly achieve the set temperature point, and achieves rapid thermal cycle. Meanwhile, just 50 minutes are required from sampling to successful identification of mononucleotide mutation by adopting the gene mutation method disclosed by the invention while the similar instrument on the market generally needs 2-3 hours. Thus, the detection efficiency of the gene mutation is greatly improved.

The present invention relates to an isolated major gene GS3 which regulates grain weight and grain length in the rice and the cloning of said gene. The DNA sequence of GS3 gene is as shown in SEQ ID NO. 1 and is 7883 bp in length. GS3 gene comprises 5 exons and encodes 232 amino acids. It is predicted based on bioinformatics analysis that said protein contains conserved domains including a PEBP-like domain, a transmembrane domain, a cysteine-rich domain of TNFR/NGFR and a VWFC domain. cDNA sequence of said gene is as shown in SEQ ID NO. 2. By sequence alignment between three large grain species and 3 small grain species of rice, it is revealed there is only one common single nucleotide mutation in a 7.9-kb region between the two different grain-length groups. Said nucleotide mutation is located at the second exon of the GS3 gene, in which a cysteine codon (TGC) in the small-grain group is mutated to a termination codon (TGA) in the large-grain group. This mutation causes a premature termination in the large-grain group, which leads to a 178-amino acids truncation (including part of the PEBP-like domain and all the other three conserved domains). The present invention also provides methods of producing transgenic plants comprising sequences disclosed herein.

The invention discloses the detection of two novel single nucleotide polymorphism (SNP) sites of a promoter region of a sheep myostatin (MSTN) gene, and the establishment of a detection method thereof. The method comprises the following steps of: 1, determining two mononucleotide mutational sites of the promoter region of the sheep myostatin gene, wherein the two mononucleotide mutational sites are positioned in a GeneBank sequence, the registry number is DQ530260, and the SNP sites (-959T/C, -784G/A) are positioned at -959th site and -784th site according to an initial codon ATG and comprise 6 genotypes (TT, TC, CC, GG, GA, AA); 2, detecting three specific primers of the mutant allele, wherein the lengths of the three specific primers are 22bp, 22bp and 21bp respectively, the first primer is used for the sequencing of the promoter region of the MSTN gene, and the second and third primers are bonded onto template strands of two mutant alleles respectively and are amplified to target genes obtained by the mutation of the alleles; and 3, performing polymerase chain reaction (PCR) amplification on genomic deoxyribonucleic acid (DNA) of a sample by a designed oligonucleotide primer, performing enzyme digestion analysis on products which are amplified to 985bp and 121bp fragments by utilizing Psp1406I and Rsa I restriction enzymes, and establishing a PCR-RFLP detection system of the SNP sites so as to obtain the polymorphism of the two mononucleotide mutational sites.

The invention provides a strawberry anthocyanin regulatory gene functional marker and belongs to the fields of fruit tree breeding and molecular genetics. The strawberry anthocyanin regulatory gene functional marker is characterized in that one mononucleotide mutation exists in coding regions by carrying out sequence comparison on a strawberry anthocyanin regulatory gene MYB10 in red and yellow strawberries, a dCAPS marker Fv-Ry is designed according to difference of the mononucleotide, the dCAPS marker can distinguish yellow, heterozygous red and homozygous red strawberries, and the marker and strawberry fruit colour character are in cosegregation. By utilizing the functional marker, a material carrying an anthocyanin regulatory gene can be rapidly and accurately screened and identified from a large number of strawberry germplasm resources, molecular marker early selective breeding is carried out, and progress of strawberry fruit colour breeding is greatly accelerated.

The invention provides a real-time fluorescence quantitative PCR method for testing single nucleotide polymorphism. The method includes two sets of combinations of primers and probes, wherein, one set of quantitative primers and probes can determine the amount of initial nucleic acid of a sample to be tested, the other set of classifying-type primers and probes and the combination thereof can determinate whether single nucleotide polymorphism occurs or not; magnesium concentration of the system is 2 mM to 10 mM, the amount of Taq enzyme is 5U to 10U per reaction and the amount of UNG enzyme is 1U to 2U per reaction. A standard curve is made according to the Ct value of a quantitative standard; the Ct value of the sample to be tested is substituted into the standard curve to determine the copy number of an initial template; the deviation between quantitative Ct value and classifying-type Ct value of the sample is calculated, and then is compared with the wild-type and the mutant-type standards to determine whether single nucleotide mutant occurs or not. The invention also provides a kit of fluorescence quantitative PCR which adopts the method to test mutant of hepatitis B virus 1896.

The invention relates to the method used to detect embryo paternal line DNA mononucleotide difference from pregnant woman's plasma. It includes the following steps: conventional PCR amplification, single basic group extending reaction marking target sequence, bead separating target sequence, and biologic bar code signal amplification and detecting. Its advantages are that it has low cost and is practicable; it can detect mononucleotide mutation and polymorphism in embryo paternal line DNA, and embryo DNA content.

The present invention provides a nucleotide mutation detection method wherein primers having a nucleotide sequence complementary to part of the nucleic acids to be detected and also having a nucleotide sequence, which is complementary to the nucleotide sequence just upstream from a nucleotide site corresponding to the mutation site of the nucleotide sequence formed at the 3′ end, added to the 5′ end, are produced so that so that the nucleotide site corresponding to the mutation site of the nucleic acids to be detected including the nucleotide mutation is located within the nucleotide sequence formed at the 3′ end after elongation; a target is produced by subjecting the primers to an elongation reaction using polymerase or Klenow enzyme; the target is then denatured to a single strand, and is subjected to a hybridization reaction with a probe that has the nucleotide complementary to the mutation site of the nucleic acids present in the 3′ end region and then to a ligation reaction, whereby it is enable to determine and assay a nucleotide located at a specific position in a nucleotide sequence of DNA or RNA and to analyze rapidly a variety of mutations including single nucleotide mutations, short nucleotide tandem repeat mutations, nucleotide deletion mutations, nucleotide insertion mutations, translocation mutations and so on.

The invention provides a single nucleotide mutation site SNP marker and a KASP marker remarkably associated with soybean protein content and application thereof, and belongs to the field of plant molecular breeding. According to the present invention, the SNP S14_73926 significantly associated with the soybean protein content is located at the No.14 chromosome 73,926bp position of the soybean genome v2.0, the base G-A replacement occurs, the phenotypic variation interpretation rate reaches 6.4%, the KASP marker is developed for the SNP site, and the SNP and KASP markers significantly associated with the soybean protein content provided by the present invention can be used for the molecular marker-assisted selection breeding of the soybean protein character, and have important theoretical and practical guiding significance for accelerating the genetic improvement process of soybean high-protein breeding and improving the breeding selection efficiency.

The invention relates to a method for identifying plant gene functions in total genome ranges.The method includes 1), mutating single nucleotide of starting plants and establishing plant mutant libraries; 2), detecting phenotypes of mutants in the plant mutant libraries and establishing plant mutant phenotype databases; 3), detecting genotypes of the mutants in the plant mutant libraries and establishing plant mutant genotype databases; 4), determining functions of genes where SNP (single nucleotide polymorphism) sites caused by mutation of the single nucleotide in the starting plants by the aid of the plant mutant phenotype databases and the plant mutant genotype databases.The method has the advantages that the genes related to plant development procedures and biological procedures of stress-tolerant reaction or metabolic pathways or the like can be accurately and quickly found by the aid of the plant mutant phenotype databases and the plant mutant genotype databases which are established by the method, and novel ways can be created for plant functional genome research.

A screening method for identifying compounds that alter the fidelity with which the initiation codon in mRNAs is recognized by the translational apparatus in eukaryotes is disclosed. This screening method was used to identify compounds having such activity. Methods of altering the fidelity of initiation codon selection are also disclosed. Methods of treating disorders characterized by single nucleotide mutations in initiation codons using compounds identified by the screening method, as well as methods of treating fungal and parasitic infections and hyperproliferative disorders using compounds identified by the screening method are also disclosed.

The invention relates to the biotechnology field, in particular to a probe set and application thereof. More particularly, the invention relates to one group of probe set, a method for constructing ahigh-throughput sequencing library, a method for determining single nucleotide mutation and haplotype of a sample to be detected, a device for constructing the high-throughput sequencing library and asystem for determining the single nucleotide mutation and the haplotype of the sample to be detected. The probe set can simultaneously detect the gene situations of various single gene inheritance diseases or genetic tumors, has good capture specificity, high sensitivity and wide coverage rate and can effectively realize the detection of 34 types of PGD (Preimplantation Genetic Diagnosis).

The invention belongs to the field of animal epidemic disease molecular biological detection methods and detection reagents. The invention relates to a detection kit and a detection method for tiger-derived pseudorabies virus. A preparation method comprises the following steps: performing high-throughput sequencing on five tiger-derived pseudorabies viruses, and assembling to obtain a whole genomesequence of tiger-derived pseudorabies; comparing with a plurality of porcine pseudorabies viruses to find that a tiger-derived pseudorabies virus genome has a plurality of single nucleic acid mutations. The tiger-derived pseudorabies virus is used for detection aiming at one mononucleotide mutation; a pair of detection primers of the pseudorabies virus and a Cycling probe for detecting the tiger-derived pseudorabies virus are designed to form an inspection kit for detecting the tiger-derived pseudorabies virus, the detection method has the advantages of simplicity and convenience in operation, high sensitivity, strong specificity, good repeatability and the like, and a result can be judged according to an amplification curve immediately after the reaction is finished.

The invention discloses a method for detecting MEG3 gene SNP related to cattle growth traits and an application thereof. According to the position of a mononucleotide mutation site in an exon area of the cattle MEG3 gene, parting is carried out on a cattle individual by adopting the PCR-RFLP and Tetra-primer ARMS-PCR technology, and correlation analysis is carried out on a parting result and growth data. In the detection method disclosed by the invention, an SNP mark closely related to the cattle growth traits is detected on the DNA level, and the detection method can be used in the marker assisted selection of cattle variety growth traits in China so as to accelerate the establishment of high-quality cattle population.

The invention belongs to the technical field of biology, and particularly relates to a mononucleotide mutation and KASP specific primer of a pepper phytoene synthase gene and application. The nucleotide sequence of an SNP mutation site KASP marker of ae pepper Psy1 gene is as shown in SEQ ID No.1, and the 21st basic group of the sequence as shown in SEQ ID No.1 is A or T. The color of the fruit does not need to be confirmed after the pepper fruit is physiologically mature, the color of the mature fruit of the pepper material can be judged only by detecting the DNA of the pepper plant in the seedling stage, and the mononucleotide mutation and KASP specific primer can be widely applied to molecular marker-assisted breeding.

The invention discloses an electrochemical sensor for detecting microRNA-21, a preparation method and application thereof. The method firstly anchors a DNA tandem with a biotin at the 5' end to the surface of an electrode, the DNA tandem is used as a main structure, and a G-rich quadruplex line is assembled by specific recognition of streptavidin-biotin as a branching structure; G tetra-chain monomer and G-quad-chain line pi-pi are stacked, self-assembly is conducted to form multi-branched DNA nanostructure, and the obtained DNA nano-assembly can be tightly combined with hemin to generate an oxidation reduction signal for electrochemical detection of miRNA-21. The method has good miRNA-21 detection sensitivity, has excellent specificity, can distinguish the single nucleotide mutation of the target nucleic acid analyte from the completely matched target RNA, analyzes an actual biological sample, and is a universal DNA nanometer biosensor platform.

The invention relates to the technical field of microsatellite site detection, in particular to a method and device for detecting instability of a free nucleic acid microsatellite. The device comprises an MSI site discrimination model used for performing information analysis of the instability state of the free nucleic acid microsatellite of a plasma sample, and the MSI site discrimination model comprises an MSI training set data preparation unit, a site model construction unit and a sample MSI state analysis unit. Compared with the prior art, a control sample is not needed, and the steps of experiment, sequencing and analysis of the control sample are omitted, so that the cost and the analysis complexity are reduced, the microsatellite instability of the whole tumor of the patient can becomprehensively detected through the peripheral blood of the patient, real-time monitoring can be realized, the operation time is short, and few resources are consumed; not only can insertion and deletion mutations of a microsatellite sequence be detected, but also mononucleotide mutations of the microsatellite sequence can be detected, the detection is more comprehensive and accurate, and the running speed of a single sample is about 10 times higher than that of double samples.