76 results about "Metagenomics" patented technology

The invention provides a virus infection detection and identification technology based on metagenomics. The virus infection detection and identification technology based on the metagenomics comprises the four portions of sample preparation, high-throughput sequencing, bioinformatic analysis and result re-checking. In the sample preparation portion, viral nucleic acid is effectively extracted or enriched from detection samples according to the requirements of the virus infection detection and identification technology based on the metagenomics and characteristics of different types of detection samples, and a nucleic acid library which can be used for a next-generation sequencing instrument is established. In the high-throughput sequencing portion, the nucleic acid library established in the sample preparation step is sequenced so to obtain sufficient high-quality nucleic acid sequence information. In the bioinformatic analysis portion, a large number of high-quality nucleic acid sequences obtained in the high-throughput sequencing step is analyzed to further obtain viral component information prompted by the nucleic acid of the samples. In the result re-checking portion, a bioinformatic analysis result and other information, such as technical contrast, are integrated to perform comprehensive study and judgment, finally alternative infection virus is determined, and other technologies, such as PCR, are utilized to perform re-checking.

The disclosure provides methods for greatly accelerating and improving de novo genome assembly. The methods disclosed herein utilize methods for data analysis that allow for rapid and inexpensive de novo assembly of genomes from one or more subjects. The disclosure further provides that the methods disclosed herein can be used in a variety of applications, including haplotype phasing, and metagenomics analysis.

The invention discloses a metagenome data analysis method based on a next-generation sequencing technology, which comprises the following steps of: (1) carrying out quality control on original sequencing data to obtain clean reads; (2) performing species annotation on the clean reads subjected to the quality control; (3) performing statistical analysis on the sample diversity based on a species abundance matrix; (4) performing statistical analysis on species with significant differences among sample groups based on the species abundance matrix; (5) splicing and assembling the clean reads to obtain a contigs sequence; (6) packaging the contigs obtained by splicing and assembling into boxes to obtain bins; (7) carrying out gene annotation on the bins subjected to boxing; (8) performing statistical analysis on the genes with significant differences among the sample groups based on the gene abundance matrix; and (9) based on the gene annotation result, performing function and species annotation on the sequence. A whole process from metagenome next-generation sequencing data processing to species composition analysis, gene composition analysis and function annotation is provided, an accurate analysis result is provided for researchers, and the metagenomics problem is comprehensively analyzed.

The invention discloses a method for extracting total DNA from an environmental sample with high efficiency for removing humus, comprising the following steps: (1) taking 0.3 g of sieved soil sample in a 2 mL centrifuge tube equipped with three 2.5 mm-3.0 mm sterilized glass beads, Add 1 mL of decomposing buffer, Vortex-Genie2 (Mobio Laboratories Inc) for 1 min, centrifuge at 12000 r/min for 2 min, discard the supernatant; (2) add 1 mL of 0.5 mol/L calcium chloride solution, Vortex-Genie2 (Mobio Laboratories Inc) ) Vortex for 2 min, centrifuge at 12,000 r/min for 1 min, and discard the supernatant; (3) Add 800 μL of DNA extraction buffer, and Vortex-Genie2 (Mobio Laboratories Inc) vortex for 5 s. Rapid and efficient extraction of total soil DNA, providing high-purity genomic DNA for soil metagenomics research.

The invention relates to a method and a device for quantitatively detecting metagenome pathogens based on internal reference. The method comprises the following steps of: adding an internal referencesequence with a set content into a sample to be detected containing a pathogen nucleic acid sequence and a human-derived nucleic acid sequence; extracting nucleic acid from the to-be-detected sample added with the internal reference sequence, and performing sequencing library construction and computer sequencing by using the nucleic acid to obtain sequencing data; counting the total sequencing sequence number, the internal reference specific detection sequence number and the pathogen specific detection sequence number; calculating the concentration of the human-derived nucleic acid in the sample to be detected; and calculating the concentration of the to-be-detected pathogenic nucleic acid according to the concentration of the human-derived nucleic acid. According to the invention, a theoretical calculation model based on a metagenomics pathogen detection technology is established, and the model can carry out auxiliary analysis on abnormal conditions occurring in pathogen metagenome detection.

The invention relates to the field of biomedicine, and particularly to screening and application of a feces gene marker based on high-flux metagenome sequencing analysis. According to the method, through extracting feces DNA for performing macro genome sequencing and ROC curve analysis by means of a shotgun method, the gene marker is screened, and furthermore the gene marker is verified through fluorescent real-time quantified PCR for obtaining consistency. According to the method, metagenome high-flux shotgun sequencing technical measurement is firstly performed in feces of Chinese PD patients, and a screening method for the feces gene marker is established; various different genes in the feces of the PD patient are found; 25 feces gene markers are screened as PD diagnosis markers for auxiliary diagnosis of the PD patient; and the method has important academic meaning and application prospect for enriching and further understanding the pathological mechanism of PD.

The invention provides a pathogenic microorganism detection method and kit based on metagenomics. The method comprises the following steps: extracting nucleic acid; constructing a high-throughput sequencing library; quantifying the sequencing library constructed in the previous step; diluting the quantified sequencing library to 1-4 pM, and carrying out high-throughput sequencing with a sequencer;and analyzing sequencing data obtained in the high-throughput sequencing. The invention further provides a pathogenic microorganism detection kit. The metagenomics-based high-throughput sequencing library construction method and the kit provided by the invention have the advantages that fragmentation enzyme is used for fragmenting DNA, DNA loss is smaller compared with a mechanical method, a fragmentation speed is higher, and the construction efficiency of the whole library is improved.

The invention provides a method for extracting microorganism total DNA from a coal seam water sample, belongs to coal seam water sample microorganism analysis and aims to solve the technical problem by providing the method for extracting microorganism total DNA from a coal seam water sample with complex composition. The method comprises the following steps: pretreating the coal seam water sample, centrifugally removing large particulate impurity, and collecting microorganisms in the water sample by means of membrane filtering; breaking microorganism cells, shredding a filter membrane on which microorganisms are collected, resuspending in a buffer solution, breaking cells by means of a ball mill, inoculating for 2-4 h at 55 DEG C with proteinase K and sodium dodecyl sulfate solution until a solution is clear; purifying and precipitating microorganism total DNA, removing miscellaneous proteins by phenol-chloroform process, and adding isopropanol precipitate to collect total DNA. The total DNA extracting method is suitable for coal seam water sample and related samples with complex composition and is good in cell breaking effect, and extracted genome is high in purity and good in completeness and is directly useful in subsequent metagenomics analysis, DGGE analysis and the like.

The invention provides a total DNA (deoxyribonucleic acid) extraction method and a kit for synchronously removing humic acid and mycoprotein and relates to the field of research of metagenomics in soil microbiology and general microbiology. The method comprises the following steps: (1) suspending samples by utilizing a humic acid combination solution, so as to obtain sediments; (2) adding a buffer solution and proteinase K, and carrying out centrifuging to obtain supernate; (3) adding a coagulant to carry out coagulating sedimentation on the residual humic acid and mycoprotein, and carrying out centrifuging to obtain the supernate; (4) adding isopropanol to precipitate DNA; (5) adding 70% ethanol to wash the sediments, and blowing off the residual ethanol; (6) adding a DNA dissolving solution (TE) to dissolve the sediments, so as to obtain a sample, namely the total DNA. The kit comprises the following components: the humic acid combination solution, a PBS butter liquid, an extraction butter liquid, the proteinase K, a 20% SDS (sodium dodecyl sulfonate) water solution, the coagulant, a DNA washing agent, the 70% ethanol and the DNA dissolving solution. Due to the adoption of the method and the kit, the one-time extraction quantity of the total DNA is enough to carry out PCR (polymerase chain reaction) amplification for dozens of times.

The invention discloses a method for extracting microbial genome DNA from poplar wood. According to the method, a CTAB (cetyltrimethyl ammonium bromide) method and an SDS (sodium dodecyl sulfonate) method are combined, and technical parameters of various steps are optimized, so that the genome DNA extracted by virtue of the method has the advantages of being high in concentration and free from pollution; determined by a spectrophotometer, OD260/OD230 and OD260/OD280 values are close to standard values, completely satisfying requirements of 16S rDNA/ITS sequencing and metagenomics sequencing adopted in the later period; therefore, the method can be directly applied to a molecular operation.

The invention discloses a pathogenic microorganism detection method and device based on metagenomics. The method comprises the following steps: acquiring metagenome sequencing data of a to-be-detected sample; preprocessing the metagenome sequencing data to obtain target data; screening the target data to obtain a target sequence; performing clustering analysis on the target sequence to obtain candidate species categories of the to-be-detected sample; comparing the target data with the non-redundant reference gene set, and calculating abundance of each gene in a single sample to obtain target species classification information of the to-be-detected sample; comparing the target data with information in a pathogenic microorganism detectable database to obtain drug-resistant gene and toxic element information of the to-be-detected sample; and determining the target species classification information, the drug-resistant gene and the toxic element information as a detection result of the to-be-detected sample. According to the invention, the pathogenic microorganism detection applicability range and the pathogenic detection accuracy are improved.

The invention discloses a screening method of feed probiotics capable of preventing chicken's infection caused by clostridium perfringens. The method comprises following steps: screening chickens infected by clostridium perfringens in clinic and disease resistant chickens; collecting the intestinal chyme samples; carrying out high throughput sequencing on microbial floras in the intestinal tractsof infected chickens and disease resistant chickens; comparing and analyzing the microbes in the intestinal tracts of infected chickens and disease resistant chickens through a metagenomics method; and screening and identifying probiotics capable of preventing infection caused by clostridium perfringens. According to the method, the metagenomics big data of floras in the intestinal tracts of infected chickens and disease resistant chickens is analyzed; probiotics capable of preventing infection caused by clostridium perfringens are selected from massive microbial floras in the intestinal tracts of disease resistant chickens, the screened probiotics are from same animals, the rejection between probiotics and a host is avoided, moreover, the screening is targeted, aimless screening is avoided, and a large amount of labor, resources, and time is saved.

The invention discloses a siphoviridae. The siphoviridae contains nucleotide sequence for enclosing an amino acid sequence shown as SEQ ID No. 1. The invention also discloses an obtaining method and application of the siphoviridae. The siphoviridae disclosed by the invention is a novel virus obtained by being separated from an oral cavity of a periodontitis patient by adopting a viral metagenomicsmethod and provides a new basis for an etiology, treatment and prevention strategy of oral diseases.

The invention relates to a Hi-C high-throughput sequencing library building method suitable for microbial metagenomics and application. The sequencing library building method comprises the following steps that 1), a metagenome sample is taken to be subjected to microbial and impurity separation, and formaldehyde cross-linking is carried out; 2), endonuclease digestion disruption is carried out oncell chromatin to obtain a material after endonuclease digestion; 3), end filling is carried out on the material after endonuclease digestion; 4), DNA cell nucleus intramolecular connection is carriedout; 5), unconnected end biotin is removed to obtain purified DNA, and the purified DNA is subjected to fragmenting, end repairing and A-tailing, and ligation adaptor; 6), DNA target fragments are sorted; and 7), the target fragments are captured by biotin, and library amplification and sequencing are carried out. According to the Hi-C high-throughput sequencing library building method suitable for microbial metagenomics and the application, microorganisms in a complex environment are enriched through separation of the microorganisms and environmental impurities, metagenome data analysis is not limited to a single species any more, and various microorganisms in the complex environment can be subjected to clustering analysis, so that Hi-C high-throughput sequencing library building of microbial metagenomics is achieved, and the application range of the Hi-C technology is expanded.

The invention provides a metagenomics-based respiratory tract throat swab sample library building method and a pathogen detection method, and relates to the technical field of microbiological detection. The library building method comprises the following steps: (a) pretreatment of a to-be-detected sample solution: adding lysozyme for digestion; (b) extraction of total nucleic acid of the sample: not adding carrier RNA in an extraction process; (c) cDNA synthesis: carrying out reverse transcription by adopting a random primer; (d) purifying a product synthesized in step (c) by using magnetic beads; and (e) construction of a sample DNA library. Based on a DNA-RNA co-sequencing principle, the invention provides the metagenomics-based method suitable for throat swab sample library building and detection and pathogen detection of a throat swab sample metagenome can be realized through a single reaction.

The invention relates to a 16S and metagenome sequencing data association analysis method and system, and equipment. According to the scheme, the method comprises the following steps: performing 16S sequencing and metagenomics sequencing on a sample to obtain 16S omics data and metagenomics data; carrying out microPITA analysis according to the 16S omics data to obtain a representative sample; performing Ween analysis according to the 16S omics data and the metagenomics data to obtain common and specific statistical species/function statistics, and performing graphical display; carrying out species/function distribution analysis to obtain species/function abundance changes and main species/function types in all the samples of the two omics; and performing correlation analysis and environmental factor correlation analysis according to the 16S omics data and the metagenomics data. According to the scheme, the 16S and metagenome sequencing data correlation analysis method is provided, the metagenome extension data is used for researching the depth, 16S is used for verifying the analysis accuracy of metagenome data, and mutual complementation and verification of two omics data are achieved.

The invention discloses a bat-derived adeno-associated virus genome, amplification primers and their application, and an amplification method. to the amplification primers, five pairs of primers are used herein as upstream primers and downstream primers; an adeno-associated virus RNA template extracted from a bat sample is subjected to RT-PCR (reverse transcription-polymerase chain reaction) amplification to obtain the amplification primers; the amplification primers are subjected to nucleotide sequencing; a complete sequence of the bat-derived adeno-associated virus genome is acquired by splicing and comparing. In allusion to characteristics of the bat-derived adeno-associated virus genome, short sequence fragments of the bat-derived adeno-associated virus genome are acquired by sequencing in reference to metagenomics in the lab; a fragmented amplification strategy is designed according to an open reading box included in the genome; the corresponding primers are designed according tothe conserved region; five pairs of primers are acquired by screening and are effective in amplifying genome sequencing of the bat-derived adeno-associated virus. The bat-derived adeno-associated virus genome amplification primers are widely applicable to the demand for detecting bat-derived adeno-associated viruses and to the corresponding field of scientific research.

The invention discloses a biosensor and a construction method of a gene trapping system, and belongs to the technical field of biotechnologies. The biosensor is a transformant or a recombinant constructed by using Acinetobacter baylyi ADP1 as a chassis organism. The construction method of the gene trapping system comprises the steps that gene fragments are trapped; and the trapped gene fragments are sequenced to obtain the sequence of the trapped gene fragments. By adopting the biosensor and the construction method of the gene trapping system, a technology developed on the basis of related technologies of the prior micro genomics, based on the whole-cell biosensor and used for trapping functional genes from environmental samples is provided.

The invention relates to a facial skin surface microorganism sampling method based on metagenomics. The method comprises the following steps: (1) dipping a disposable medical disinfection cotton swabinto sterile normal saline, and performing sampling in an area specified by a disposable sterilization specification plate; (2) in a sterile room, collecting samples according to the sequence of leftcheek, right cheek and forehead of a subject, and circling the cotton swabs obtained in the step (1) for 50 times in each area; and (3) putting the sampled cotton swab obtained in the step (2) into asterile Pbw solution, and performing storing at 4 DEG C for later use. The skin surface of the subject is not damaged in the sampling process, skin irritation caused by invasive sampling is avoided, safety is higher, and the method is suitable for facial skin sampling. Subsequent microbial community sequencing verifies that compared with other skin microbial sampling methods, the method provided by the invention can better restore the real micro-ecology of the skin.

The invention relates to a method for activity quantification of a novel antibiotic resistance gene in an environment based on metatranscriptomics and metagenomics. The method specifically comprises the following steps: 1) extracting total DNA and RNA from an environmental microorganism sample; 2) performing metagenome sequencing on a DNA sample, and performing macro transcriptome sequencing on a RNA sample; and (3) analyzing metagenome sequencing and metatranscriptome sequencing results, identifying the novel antibiotic resistance gene and the host thereof, and quantifying the activity of the novel antibiotic resistance gene. The method disclosed by the invention does not depend on strain isolated culture, and activity quantification and host identification of the antibiotic resistance gene in environmental microorganism samples can be realized by combining metagenome and metatranscriptome methods.

The invention discloses a screening method of feed probiotics capable of preventing porcine salmonella infection. The screening method comprises the following steps: screening piglets infected by salmonella and disease resistant piglets, collecting intestinal content samples of piglets infected by salmonella and disease resistant piglets; carrying out high-throughput sequencing on intestinal microbial floras of piglets infected by salmonella and disease resistant piglets; performing meta-genomic comparison and analysis on intestinal microbes of piglets infected by salmonella and disease resistant piglets; and screening and identifying probiotics capable of preventing salmonella infection. The provided screening method screens out probiotics capable of preventing salmonella infection from agreat amount of microbial floras of disease resistant piglets, and is strongly targeted, the blindness of screening is avoided, the screening efficiency is improved, and a large amount of labor, materials, and time is saved.