140 results about "Allele frequency" patented technology

The present invention related to a method of determining the frequency of an allele in a population of nucleic acid molecules. The method comprises pooling the nucleic acid molecules of a population of nucleic acids, performing primer extension reactions using a primer which binds at a predetermined site located in nucleic acid molecules, and obtaining a pattern of nucleotide incorporation.

The invention encompasses methods and products related to genotyping. The method of genotyping of the invention is based on the use of single nucleotide polymorphisms (SNPs) to perform high throughput genome scans. The high throughput method can be performed by hybridizing SNP allele-specific oligonucleotides and a reduced complexity genome (RCG). The invention also relates to methods of preparing the SNP specific oligonucleotides and RCGs, methods of fingerprinting, determining allele frequency for a SNP, characterizing tumors, generating a genomic classification code for a genome, identifying previously unknown SNPs, and related compositions and kits.

The invention provides a method for analyzing copy number variation in a genome of a testee. According to the method, mathematical manipulation is creatively performed on variables extracted from sequencing data, new two-dimensional variables, namely a sequencing depth ratio (SDR) and alternate allele frequency (AAF) or alternate allelic haploid frequency (AHF) are derived, the signal/noise ratio is further increased, detection sensitivity and precision are improved, and information contained in the high-throughput DNA sequencing data is utilized more fully. Besides, the method is used for processing free DNA in a body fluid sample of the testee, wherein when a CNV feature signal of a certain locus of the genome is extracted from the sequencing data, the information close to the locus is introduced, so that signal strength is greatly improved, and the copy number variation in the free DNA in urine or serum can be effectively detected. The invention furthermore provides a system for implementing the method.

The present application discloses a method for detection of insertion deletion mutation based on second generation sequencing, a device and a storage medium. The method comprises the following steps:comparing a sample to be tested with a file of a reference genome to extract a set of candidate mutation sites with mutation allele frequency being greater than or equal to a threshold; filtering to remove sites in a short tandem repeat region; making detail statistics of comparison information of the mutation sites and comparison information surrounding the mutation sites, wherein the comparisoninformation includes InDel site and reference base support number, comparison quality, coverage depth, surrounding non-reference base and other insertion deletion mutations, surrounding read quality;and filtering to remove sites that do not reach the set threshold according to statistical information to obtain mutation results. The method does not require partial assembly, and filters second-generation sequencing data in advance to quickly eliminate most of false positive results caused by the comparison, reduces detection running time and computing resources, improves detection efficiency, has strong sensitivity and specificity, and can quickly and accurately detect InDel mutations.

The invention discloses an SNP mark combination for traceability and identification of beef cattle individuals and meat products and application of the SNP mark combination. The SNP mark combination disclosed by the invention comprises 32 highly polymorphic loci distributed on 29 autosomes. The minimum allele frequencies of the combination loci are all greater than 0.35. The experiments show that the combination can be successfully applied to the identification of the beef cattle individuals except for yak breeds in the market and the traceability of the meat products and is conducive to the realization of the whole chain traceability of breeding-slaughtering-selling to really ensure food safety.

The invention discloses 29 micro-haplotype sites, a screening method, a multiplex amplification system and an application. The screening method comprises the following steps: acquiring population data, acquiring micro-haplotype genotypes and allele frequencies from the population data, calculating forensic related parameters of candidate sites in different populations and excluding sites affectingsubsequent sequencing typing to obtain the 29 micro-haplotype sites; designing primers and amplification conditions according to the 29 micro-haplotype sites, and establishing the multiplex amplification system based on three-round PCR amplification systems. According to the multiplex amplification system, DNA templates extracted from mixed biological samples are amplified, amplification resultsare subjected to large-scale parallel sequencing, value of the sequencing depth of each micro-haplotype site in the DNA templates is obtained, and finally, the purpose of typing the mixed biological samples is achieved. The multiplex amplification system is suitable for large-scale parallel sequencing technology and has the advantages of high detection flux, high detection speed, large quantity ofobtained data, more accurate detection results and the like.

The invention relates to a method for judging the gene type of a fetus. The method comprises the following specific steps: A, extracting a DNA (deoxyribonucleic acid) sample of peripheral blood of a pregnant woman, and carrying out exon sequencing to obtain original data; B, carrying out quality control on the original data, comparing with a reference sequence, detecting SNP (Single Nucleotide Polymorphism), annotating and counting; C, based on four combination modes of the gene types of the pregnant woman and the fetus, calculating to obtain the Gaussian mixture model of the minimum gene frequency of SNP sites with the four combination modes by using a maximum expected value algorithm; D, calculating to obtain three critical values of the Gaussian mixture model; E, judging the gene type of the fetus by comparing the minimum gene frequency of each SNP site with the three critical values. According to the method for judging the gene type of the fetus disclosed by the invention, the mutation site of fetal gene can be calculated by means of the peripheral blood of the pregnant woman, the method is accurate and safe, DNAs from the father do not need, the sequencing depth is deeper, the cost is reduced, and the method is economic and practical.

The invention discloses a wheat BSR-Seq gene locating method. The wheat BSR-Seq gene locating method comprises the following steps of: constructing and sequencing mixing pools, performing quality variation mining, screening a transcript tightly linked to a target gene, developing and locating a molecular marker, etc. The next-generation transcriptome sequencing technology (transcriptome sequencing, RNA-Seq) and a mixing pool technology (Bulked Segregant Analysis BSA) are combined; a wheat sequencing draft sequence is used as a reference sequence at first; then, a lot of high-quality SNP heritable variations on the transcript is mined at high throughput by adopting the next-generation sequencing technology; the allele frequency is precisely calculated in combination with the mixing pool technology, so that the transcript tightly linked to the target gene possibly can be rapidly screened out; false positive is precisely checked and controlled through Fish; the method is independent of a reference genomic sequence, low in cost, rapid and high in precision; the wheat gene locating efficiency and precision are increased; the wheat polymorphic molecular marker developing cost is reduced; therefore, the wheat gene fine locating working time is reduced to several months from several years; the locating precision is reduced to a fraction or 0 cM from several cM; and the fine locating cost is reduced to several thousands from several ten thousands.

The invention relates to the fields of molecular biotechnologies and molecular marker technologies, in particular to a single nucleotide polymorphisms (SNP) molecular marker located on a porcine chromosome 1 and related to daily gain of a pig and application of the SNP molecular marker. The SNP site marked by the SNP molecular marker located on the porcine chromosome 1 and related to the daily gain of the pig corresponds to 162192627 T>C mutation on the chromosome 1 of an international porcine genome 11.1 version reference sequence. By optimizing a dominant allele of the SNP, the dominantallele frequency can be increased by generations, the daily gain of the pig is increased, pig genetic improvement development is accelerated, and thus economic benefits of pig breeding are effectivelyincreased.

The invention relates to a high-density SNP molecular mark screening method for monitoring the breed conservation effect of poultry, application there to chicken breed conservation and an authentication method of an SNP molecular mark. Multiple breeds of poultry of the same kind are selected, multiple individuals are selected for each breed of poultry, and SNP screening includes the following steps that 1, all the breeds of poultry are shared, and each SNP site at least has two alleles in any breed; 2, distribution is relatively concentrated on a gene group, and the number of SNP sites within the interval of the gene group 1M is larger than 90; 3, genetic diversity is abundant, and the minimum allele frequency of each SNP site in any breed is larger than 0.1, and the SNP sites meeting the requirements of the step1, step2 and step3 are obtained through screening. A simplified gene group RAD-seq sequencing technology is utilized for sequencing chicken breeds at different places, and the uniform SNP sites which are distributed on different chicken gene groups in a concentrated mode and have abundant genetic diversity are authenticated through sequence comparison.

The present invention relates to a system for predicting an incidence of disease from genetic polymorphism and uses the prediction result to form a personal nutrition complex. The system collects at least one personal information and single nucleotide polymorphism (SNP) information then exchanges the above information with databases including a personal database, a genetic risk database, an allelic frequency database, and a prevalence database. Finally, the system will output a prediction report and indicates a risk of specific disease and a plurality of abnormal genes. According to the prediction results, the system also can provide a plurality of nutritional supplement ingredients to form a personal nutrition complex. Users can receive a comprehensive and an effective nutritional supplement countermeasure about abnormal genes for prevention of the specific disease.

The invention discloses a molecular marker identification method related to pig birth litter weight and fetal weight and an application of the molecular marker identification method. The identification method comprises the following steps: collecting a sample; extracting and detecting pig genome DNA; then, conducting SNP (single nucleotide polymorphism) chip genotype judgment and genotype data quality control: adding a PCR amplification primer pair and conducting a PCR amplification reaction by taking DNA of the sample as a template, purifying a reaction product and co-crystallizing the purified reaction product with a mass spectrum chip, conducting detection and typing by virtue of a flight mass spectrum method, detecting an SNP site of a target gene, computing an SNP genotype and an allele frequency by virtue of PopGene3.2, and conducting association analysis on the SNP and characters by virtue of SAS9.2 software; and finally, conducting data collating and analysis. The identification method disclosed by the invention, by determining the genotype of a pig individual, can assist identification of multiparous litter weight and fetal weight.

The invention provides a preparation method of a tumor sample sequencing reference, and belongs to the technical field of high-throughput sequencing. The method comprises the following steps: performing monoclonal culture on a tumor cell line to obtain a monoclonal cell line and extracting a whole genome; determining an allele frequency; determining a dilution multiple according to an allele mutation frequency and a target allele mutation frequency; diluting the monoclonal cell line with negative cells in multiple proportion to obtain mixed cells; extracting a whole genome of the mixed cells,and determining an allele mutation frequency; and according to the comparison between the allele mutation frequency and the target allele mutation frequency of the mixed cells, refining the multiple of multiple-proportion dilution, and diluting the monoclonal cell line with negative cells to obtain the reference. According to the method disclosed by the invention, the gene background of a cell line is determined by combination of cell strain monoclone and high-throughput sequencing; and a multiple-proportion dilution method with multi-step gradual refinement is combined with a flow cytometry to accurately count cells so as to ensure high repeatability of reference preparation.

Disclosed are methods for treating cancer (e.g., solid tumor cancers, lung cancer, bladder head and neck cancer) with an anti-PD-L1 antibody in a patient identified as being responsive to anti-PD-L1 antibody therapy by detecting a mutation in one or more disclosed circulating tumor DNA (ctDNA) markers. Also disclosed are methods for determining the efficacy of anti-PD-L1 therapeutic antibody treatment in a patient having lung cancer or bladder cancer comprising detecting variant allele frequency in ctDNA in plasma samples and determining the difference of the variant allele frequency in ctDNA between the first and at least second plasma samples, wherein a decrease in the variant allele frequency in the at least second plasma sample relative to the first plasma sample identifies the anti-PD-L1 antibody treatment as effective. The disclosure also provides methods of identifying a subject having a cancer responsive to a therapy comprising an anti-PD-L1 antibody by detecting the expression of a mutation in one or more circulating tumor DNA (ctDNA) markers.

The invention belongs to the technical field of molecular biotechnology and molecular markers and particularly relates to an SNP molecular marker which is positioned on a No.7 porcine chromosome and related to the area and thickness of the eye muscles and application. An SNP locus of the SNP molecular marker positioned on the No.7 porcine chromosome and related to the area and thickness of the eyemuscles corresponds to a mutation (A>G) of the 30342161st site of the No.7 chromosome of an international porcine genome 11.1 version reference sequence. The invention also provides a primer pair foridentifying the molecular marker. Through the molecular marker and the primer pair, dominant alleles of SNP can be screened generation by generation, the frequency of the dominant alleles is increased, the area and thickness of the eye muscles of a pig are increased, the economic benefit of pork is finally increased, and the molecular marker and the application have very important significance inthe progress of genetic improvement of pigs.

The invention relates to the field of genes, in particular to a method and a device for detecting somatic cell copy number variation in a specified genome region. According to the method, a pluralityof indexes including a log2 (copy Ratio) value, B allele frequency (BAF) difference significance, difference significance of homogenized read length coverage in a target capture area and difference significance of homogenized read length coverage in a non-target capture area are integrated, and multivariable analysis is applied to synthesize a plurality of index analysis results, so efficient andaccurate copy number variation detection is carried out on a specified gene or interval.

The invention relates to the technical field of molecular biology, and especially relates to a multiplex amplification system, and a next generation sequencing typing kit and typing method for 21 micro-haplotype sites. The 21 micro-haplotype sites in the multiplex amplification system are derived from 21 autosomes, are balanced in allele frequency, are mutually independent between the sites, and have the advantages of polymorphism and low mutation rate. The kit contains 53 PCR-amplified single-end specific primers shown in SEQ ID NO. 1-SEQ ID NO.53, and can detect the 21 microhaplotype sites in a same reaction system. The multiplex amplification system, the kit and the typing method provided by the invention can solve the technical problem that a current STR typing technology cannot obtainan ideal typing result, and allele loss may occur due to excessive number of SNP sites.

The invention provides a chromosome aneuploidy analysis method and a chromosome aneuploidy analysis system. According to the method, sample sequencing depth is subjected to statistical analysis basedon a Zscore algorithm, and the condition of chromosome aneuploidy is comprehensively judged in combination with statistical analysis of SNP allele frequency of samples. The method provided by the invention is high in accuracy, is not influenced by the SNP locus number of a sample to be detected, has high specificity and sensitivity (up to 100%), and can also be used for judging whether abnormal chromosomes are deleted or amplified.

The invention discloses a genetic marker combination for human individual recognition and/or paternity identification and a detection method thereof. By conducting whole-genome SNPs unbiased scanningon multiple races, a SNPs site combination widely applicable to the multiple races is screened, and 116 autosome SNPs sites which come from 37 groups in different regions in the whole world, have thehypermorph allel frequency and low difference and achieve independent inheritance and 12 X chromosome SNPs sites which come from 37 groups in different regions in the whole world, have the hypermorphallel frequency and low difference and achieve independent inheritance are screened from 25,580,678 SNPs sites in a genome-wide scale. Compared with an existing commercial kit, the SNPs site combination has higher and wider multiracial adaptation, the cumulative individual recognition probability and the cumulative probability of exclusion are both significantly superior to those of the commercialkit, the detection result is more accurate, and a great application prospect is achieved.

The invention provides a method for generating SSR molecular identification numbers of fruit trees based on SSR genotypes. The method comprises the following steps: screening SSR primers for fruit tree variety amplification and performing PCR amplification on the fruit tree varieties; after performing electrophoretic detection on the PCR amplification product, counting the genotypes of the fruit tree varieties at various SSR sites, arranging all the genotypes at various SSR sites in an ascending order before assignment, marking the non-deficient genotype as 00, and numbering the genotypes in order from 01 to 99, and then sequentially connecting the genotype numbers of each variety at various SSR sites in a certain SSR site order based on the standard, thereby forming the SSR molecular identification number of the fruit tree variety. The method takes the difference of the allele frequencies of various SSR sites due to such factors as selection, mutation and drift into full account.

Methods and kits are provided for detecting polymorphisms in carboxylesterase-1 (CES1). Several single nucleotide polymorphisms (SNPs) in CES1 in humans, and methods for detecting the same, are provided (e.g., Gly143Glu, 12754T>del). Results indicate that the Gly143Glu (9486G>A) polymorphism has an allelic frequency of 1.5% in the Caucasian population. Polymorphisms of the present invention may alter the function of the carboxylesterase-1 enzyme (hCES1). Thus, the methods and kits of the present invention may be used to personalize a therapy and/or avoid adverse consequences of altered metabolism of a therapeutic or compound (e.g., enalapril, methylphenidate, etc.) which may result due to a CES1 polymorphism. In addition, recombinant cells lines overexpressing wild-type CES1 or expressing CES1 mutants are provided. Such cell lines may be used to assess the effects of candidate compounds on CES1, and the action of CES1 on these candidate compounds.

The invention discloses SNP molecular markers used in chromosome 6 of a pig for traceability and application thereof. The SNP molecular markers are obtained by means of NCBI database sequence alignment, and peculiarly recognized by Eco72I restrictive endonuclease, the total number is 670 bp, a base substitution exists in a base group of the 284th position and is 284 C or 284 T, and the sequence of the molecular markers is shown as SEQ ID NO.1; distribution conditions alleles of the SNP molecular markers in test groups are analyzed in the test groups including ten pig varieties or strains, it is found that allele frequencies of the SNP molecular markers in the different varieties or strains are approximate, polymorphism is rich, the allele frequency distribution difference among the varieties or the strains is small, heterozygosity is larger than 0.3, and the SNP molecular markers can be used for DNA traceability of pork products.