61 results about "Single copy gene" patented technology

Single copy sequences suitable for use as DNA probes can be defined by computational analysis of genomic sequences. The present invention provides an ab initio method for identification of single copy sequences for use as probes which obviates the need to compare genomic sequences with existing catalogs of repetitive sequences. By dividing a target reference sequence into a series of shorter contiguous sequence windows and comparing these sequences with the reference genome sequence, one can identify single copy sequences in a genome. Probes can then be designed and produced from these single copy intervals.

The invention provides reorganized mannase, genetically-engineered bacteria of the recombined mannose and a hydrolyzing preparation mannan oligosaccharide method. The hydrolyzing preparation mannan oligosaccharide method comprises the steps 1), optimizing and reorganizing beta-mannase genes according to pichia pastoris codon preference; 2), constructing expression vector pHBM905BDM-Man containing the beta-mannase genes, converting pitchia pastoris GS115 competence cells, and fostering and checking to obtain single-copy genetically-engineered bacteria; 3) constructing, fostering and checking to obtain multi-copy genetically-engineered bacterium; 4) using different-copy-number genetically-engineered bacteria to efficiently express and prepare reorganized beta-mannase; and 5) using reorganized beta-mannase hydrolysis mannan substrate to produce mannan oligosaccharide. Substrate hydrolysis concentration is 15-40%, temperature is 50 DEG C to 55 DEG C, and time is 0.5 hour to 2 hours. At present, two-copy beta-mannase genetically-engineered bacteria GS115/MAN78(CCTCCNo:2012554) is high in expression level. The activity of the beta-mannase is 5000U/mL (a decimal number system method), hydrolysis substrate specificity is high, and hydrolysis substrate concentration is obviously higher than that of other methods.

The invention discloses recombinant alginate lyase, an engineering bacterium thereof and a method for preparing alginate oligosaccharide through hydrolysis. The method is characterized by screening an alginate lyase gene AlgM according to a strain Vibrio sp.BZM-1 newly isolated from seaweeds; constructing an expression vector pHBM905BDM-AlgM containing the gene, and converting pichia sp GS115 competent cells to obtain a single copy gene engineering bacterium; and constructing, culturing and verifying the multi-copy gene engineering bacterium to prepare recombinant alginate lyase through high-efficiency expression, and producing alginate oligosaccharide by hydrolyzing sodium alginate with alginate lyase. The recombinant alginate lyase gene engineering bacterium GS115/AlgM4 (CCTCC No:M2015500) containing four copies has a higher expression level. The activity of recombinant alginate lyase is as high as 31000U/mL.

The invention provides an O-type foot-and-mouth disease recombined phage vaccine of a pig and a construction method thereof. The vaccine adopts recombined T7 phage as an antigen, and the amino acid sequence such as FMDVVP1(129-169) polypeptide of Mya98 pedigree shown in SEQIDNO:2 is expressed on the surface of the recombined T7 phage; and the VP1 (129-169) polypeptide is obtained by inserting single-copy VP1(129-169) genes into the downstream of the P10B gene of the T7 phage to carry out fusion. The invention has the following technical effects that (1) the recombined phage vaccine prepared by the T7 phage carrier can overcome the shortcomings of weaker self immunogenicity of the FMDVVP1 polypeptide and the defect of lack of T auxiliary cell epitope, effectively improve the immunogenicity and stimulate the organism to generate the higher-level antibody; and (2) since the T7 phage is easy to culture, the purification is convenient, and the invention for producing the gene engineering vaccine has multiple advantages. In the O-type foot-and-mouth disease recombined phage vaccine of the pig, the on-scale production is convenient and the cost is low.

The invention relates to the technical field of molecular organism and specifically relates to a method for accurately measuring length of crowd telomere. A 36B4 gene of a coding acidic ribosome phosphoprotein is selected as a single copy gene. The method comprises the following steps: extracting a human genome DNA; designing a reference substance and a primer and compounding; designing telomere and 36B4 standard curve; adopting a RT-qPCR method for measuring the length of crowd telomere; analyzing data. According to the invention, on the basis of the RT-qPCR method, the telomere standard curve and the single copy gene standard curve are added for more accurately measuring T and S values, so that a more accurate telomere length can be acquired; the DNA dosage is small; only 60ng DNA is required; the measuring speed is high; the measurement has comparability; the telomere length can be accurately measured in batches; and the method is specially suitable for the measurement for the crowd telomere length.

The invention belongs to the field of microorganism animal cell lines, and relates to a cell system for generating hepatitis B virus (HBV) recombinant cccDNA. Through a transposon system, HBV single-copy genomes with two ends provided with loxP sites are integrated into HepG2 cells, a clone HepG2-HBV/loxP cell line integrated with the different-copy-number HBV genomes is obtained, the cell line does not express HBsAg, after cyclization recombination enzyme (Cre) is introduced through adenovirus transduction, the rcccDNA is generated and the HBsAg is expressed, and expression of the HBsAg is closely relevant to the generation and level of the rcccDNA; the rcccDNA is rapidly and stably generated, the structure feature of the rcccDNA is similar to that of real HBV cccDNA, and transcription, copy and protein expression of viruses can be supported; the rcccDNA can be quantitatively detected through quantitative PCR by designing a specific primer, and Southern Blot detection can be carried out by utilizing a digoxin marking system. The cell system can be used for establishing a platform for HBV cccDNA relevant biological research and screening and evaluation of anti-HBV medicines.

The invention relates to a quantitative detection method, composition and kit of donkey/horse-derived components in a donkey-hide gelatin colloidal liquid semifinished product or finished product, belonging to the technical field of molecular biology. The method comprises the following steps: designing donkey/horse universal primers and donkey/horse specific probes according to the donkey/horse house-keeping gene single-copy genes, extracting DNA (deoxyribonucleic acid) of a sample to be detected, carrying out TaqMan qPCR (quantitative polymerase chain reaction) on the donkey-hide gelatin colloidal liquid semifinished product or finished product to perform quantitative detection on donkey/horse-derived components, calculating the number of copies of the donkey/horse-derived nuclear genes in the unit mass of the donkey-hide gelatin colloidal liquid according to the standard curve and the Ct value of the sample to be detected, and calculating the proportion of the donkey/horse-derived components in the donkey-hide gelatin, thereby quantifying the donkey/horse-derived components in the donkey-hide gelatin sample. The method, composition and kit have the advantages of high specificity and high sensitivity, implement qualitative detection on the donkey/horse-derived components in the donkey-hide gelatin, and can also implement quantitative analysis, thereby providing technological popularization and application for quality control of donkey-hide gelatin enterprises.

The invention discloses a quick and batch test method for the copy number of multi-copy genes of genomes by virtue of a PCR (polymerase chain reaction) technology. The method comprises the following steps of: respectively carrying out PCR amplification and product purification on some multi-copy genes and some known single-copy gene on a same tissue DNA (deoxyribonucleic acid) sample to test the mass concentration of each gene PCR purified product, converting the mass concentration into molar concentration according to the nucleotide sequence of the product, and preparing the standard curves of the genes by same RT-PCR (reverse transcription-polymerase chain reaction) by taking the PCR product and the tissue DNA sample which are subjected to gradient dilution as a template, thus obtaining the concentration of each gene in the DNA sample. Under the same extraction efficiency, the copy number of the multi-copy genes is the number obtained by dividing the quantity of the multi-copy genes under the same volume by the quantity of the single-copy gene, so that the copy number of seven different multi-copy genes in same biont can be tested by once 96-pore RT-PCR reaction, and the copy number of eleven different multi-copy genes can be tested by once 384-pore RT-PCR reaction. Therefore, the quick and batch test efficiency can be realized.

The invention provides a change feature analysis method of liver mtDNA copy number in the sepiella maindroni aging process. The method includes: sample genome DNA extraction, single copy gene primer design, real-time quantitative PCR standard preparation and standard curve establishing of nuclear genome and mitochondrial genome single copy gene, detection of mitochondrial genome copy number in a sample and content calculation, wherein a sample DNA extraction method includes: adding sepiella maindroni tissue into polybutylene succinate powder and alkyl ether ammonium sulfate, grinding together,and performing extraction, organic solvent separation and precipitation to obtain sample DNA. By applying fluorescent quantitative PCR technology, accurate detection and quantification of mitochondria can be realized, and analyzing change of liver mtDNA copy number in the sepiella maindroni aging process is conducive to providing a solution for increasing spawning rate and providing new referencefor studying human aging.

The invention relates to the field of in-vitro diagnosis, and more specifically relates to a universal probe for simultaneously detecting multiple sites of a genome, and a primer design method and anapplication kit thereof. The universal probe adopts a short tandem repeat sequence as a skeleton sequence, and solves the problems that the number of the probes in a reaction system in which the copynumber concentration is amplified is too large, and non-specific amplification is easily formed and the synthesis cost is high, and the concentration of the chromosome copy number can be proportionally amplified by designing multiple pairs of the primers on both sides of the universal probe position of the single copy gene fragment of the chromosome to-be-tested, which is especially suitable for the detection of certain very low concentration samples (such as whether the non-invasive detection of chromosome copy number generates variation or not).

The invention discloses a DNA barcode preparation method and a Phytophthora fragariae DNA barcode. The preparation method of the application comprises: sequencing target strain genome DNA by using high-throughput sequencing technology, subjecting sequencing results to bioinformatics analysis, analyzing an evolutional relation of gene fragments in the genome DNA by using a phylogenetic tree to obtain a target strain greater than or equal to 95% and less than 100% in similarity to strains of same genus, and subjecting single copy gene fragments not higher than 1000 bp to genetic distance analysis to obtain the target strain DNA barcode capable of genuinely reflecting genetic relations. The preparation method of the application uses the high-throughput sequencing technology to comprehensively analyze genome DNA and uses the phylogenetic tree and genetic distance analysis to obtain the DNA barcode; a single and effective way to prepare the DNA barcode is provided; the obtained DNA barcode is able to most effectively characterize target strains.

The invention provides a PCR method for detecting absolute telomere length, and belongs to the field of molecular biological techniques and medical detection. According to the method, the absolute length of the telomere of the human can be conveniently and accurately detected. A gene synthesis method is adopted for synthesizing oligonucleotide sequences of the telomere and a single-copy gene 36B4respectively, the sequences are connected to a plasmid vector to construct a standard product, escherichia coli is utilized for in-vitro amplification of the plasmid standard product, the plasmid DNAis extracted, the concentration is measured, and the copy number and the total length of the telomere are calculated. The initial mass of the standard product is determined, gradient dilution is conducted, a fluorescence quantitative PCR method (Q-PCR) is adopted for obtaining standard curves of the telomere and the 36B4 separately, through the standard curves, the total length of the telomere andthe copy number of the 36B4 of the to-be-tested sample DNA are subjected to absolute quantification, and thus the average absolute telomere length of the to-be-tested sample DNA is calculated. The length of the telomere is detected through the absolute telomere length PCR method, and the PCR method has the advantages of being low in cost, short in period and high in accuracy, and is suitable forhigh-throughput detection, easy to clinically apply and popularize, and high in practicability.

The invention provides a Meloidogyne molecular identification primer set which is prepared by the following steps: by comparing a predicted south Meloidogyne protein sequence respectively with south Meloidogyne genome and north Meloidogyne genome, setting the similarity of the comparison sequence, i.e. the percent parameter is 75, thereby obtaining the single-copy gene; by comparing the single-copy gene protein sequence respectively with the south Meloidogyne genome and the north Meloidogyne genome, setting the similarity of the comparison sequence, i.e. the percent parameter is 85, and screening the conserved single-copy gene in both of the two genomes; screening the gene of which the introne length difference between the two genomes is greater than 200bp; and designing primers on the basis of the exon sequences on two sides of the difference introne. Abundant primers are provided to enhance the detection accuracy; and the difference between the PCR (polymerase chain reaction) products of the primers via agarose gel electrophoresis is more than 200bp, and thus, the primers can be identified conveniently.

The invention relates to a detection method of vegetal single copy genes based on fluorescence in situ hybridization of quantum dots. By preparing quantum dot coupled DNA (deoxyribonucleic acid) as a probe, according to the traditional fluorescence in situ hybridization method, the hybridization detection of vegetal single copy genes is carried out on interphase nucleuses, chromosomes, DNA fibersor the like. In the method provided by the invention, a direct marking method is adopted, thus an antibody detection process is omitted; and because the quantum dots have high fluorescence intensity and can resist photo-bleaching, the sensitivity and resolution of hybridization are improved, and the vegetal single copy genes can be quickly and effectively located. The method provided by the invention can be widely used for drawing physical maps and analyzing the composition, structure, rearrangement, evolutionary relationship and the like of genomes.

The invention discloses a quantitative test method of exopalaemon carinicauda mitochondrial genome copy number. The method comprises the steps of selecting the adenylyl transferase gene (ANT) and the ATP6 respectively as the single copy genes of the nuclear genome and the mitochondrial genome of white tailed shrimp, designing the primer and the fluorescent probe suitable for the real time quantitative PCR reaction of the ANT and ATP6 genes, preparing real time quantitative PCR reaction standard of the ANT and ATP6 genes, through drawing the standard curve (as shown in the attachment), and using the standard curve as the standard, and quantifying and calculating the copy number of the mitochondrial genome in the to-be-tested sample cells. The method can correctly and quantitatively test the mitochondrial genome copy number of the exopalaemon carinicauda tissue sample cells, and has the advantages of being high in specificity, and simple in operation. Merely the fluorescence quantitative PCR instrument is enough to complete the quantification of the exopalaemon carinicauda mitochondrial genome copy number.

The invention discloses a method for quantitatively detecting bovine-derived materials in livestock and poultry meat based on QPCR (quantitative polymerase chain reaction). By the method, the contentof bovine-derived materials in meat products is quantitatively analyzed by real-time fluorescent PCR technology; 15 animal genome sequences are analyzed by applying a bioinformatical method; universalprimers and specific primers are designed by screening single-copy genes; the percentage of bovine-derived species specific genes is corrected by an internal reference gene; and the deviation of quantity value results is eliminated, thereby obtaining the authentic and reliable food adulteration value, and effectively improving the sensitivity and accuracy of the detection method. The detection method disclosed by the invention can complete the identification work of the bovine-derived materials within 3 hours, has the characteristics of simple and easy operation, high sensitivity, rapidity, low cost, convenient promotion, and the like, and opens up a broad prospect for quantized adulteration identification of animal-derived materials.