WO2020103359A1 - 一种基于sanger测序快速鉴定人体真菌的方法 - Google Patents
一种基于sanger测序快速鉴定人体真菌的方法Info
- Publication number
- WO2020103359A1 WO2020103359A1 PCT/CN2019/078350 CN2019078350W WO2020103359A1 WO 2020103359 A1 WO2020103359 A1 WO 2020103359A1 CN 2019078350 W CN2019078350 W CN 2019078350W WO 2020103359 A1 WO2020103359 A1 WO 2020103359A1
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- sequencing
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- dna
- centrifuge
- pcr amplification
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- 241000233866 Fungi Species 0.000 title claims abstract description 13
- 238000007480 sanger sequencing Methods 0.000 title claims abstract description 11
- 238000000746 purification Methods 0.000 claims abstract description 23
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- 241000228197 Aspergillus flavus Species 0.000 claims description 5
- 241001225321 Aspergillus fumigatus Species 0.000 claims description 5
- 241000228245 Aspergillus niger Species 0.000 claims description 5
- 241000222122 Candida albicans Species 0.000 claims description 5
- 241000222178 Candida tropicalis Species 0.000 claims description 5
- 241000222126 [Candida] glabrata Species 0.000 claims description 5
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6869—Methods for sequencing
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
- C12Q1/6895—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for plants, fungi or algae
Definitions
- the invention belongs to the technical field of high-throughput sequencing, and particularly relates to a method for quickly identifying human fungi based on sanger sequencing.
- the specimens are inoculated in a specific medium, and the colonies are formed after incubation at room temperature, and the bacteria are judged by the appearance, and the colonies are smeared for microscopic examination.
- the dideoxy chain termination method (Sanger method) sequencing was invented by Frederick Sanger in 1977. It can be mainly used for DNA sequence analysis.
- the nucleic acid template is copied or transcribed in the presence of nucleic acid polymerase, primers, and four single deoxy bases. 4 tubes introduce 4 kinds of dideoxy bases with different fluorescence.
- DNA polymerase can insert 4 kinds of dideoxynucleoside triphosphate raw materials into the DNA chain. Due to the lack of -OH group at the 3 'position of dideoxynucleoside triphosphate, Will not continue to extend, so you can get different lengths of DNA fragments with different fluorescence.
- the object of the present invention is to provide a method for rapid identification of human fungi based on sanger sequencing.
- the adopted technical solution is: a method for rapid identification of human fungi based on sanger sequencing, including the following steps:
- DNA extraction and quality inspection steps use secretion (fungal) DNA extraction kit for DNA extraction; use NanoDrop2000 to detect the sample concentration and purity, when the sample concentration is> 10ng / uL and the purity is between 1.6 and 2.0, it is considered qualified;
- the main parameters of the design and setting are: the length of the primer is generally 18-24bp; the theoretical annealing temperature Tm value is 55 °C -65 °C; the (G + C) content is 40% -70%; the size of the amplified fragment is ⁇ 800bp. Make a record of the designed primer information, including the primer name, sequence and product size; then perform primer synthesis;
- PCR amplification step When the quality of the DNA template is confirmed, PCR amplification can be arranged with a reaction system of 25ul; using the genome as a template, New England Biolabs, Ltd Q5 ultra-fidelity DNA polymerase is used for PCR amplification;
- PCR product purification step use 1.5% agarose gel electrophoresis to purify the unpurified sample after PCR amplification;
- Sequencing step use ABI's BDT3.1 sequencing kit for pre-sequencing and put it into a sequencer for sequencing;
- Data processing steps use splicing software DNAStar to splice and then use the blast method to process.
- the human fungi include any one or more of Candida glabrata, Candida albicans / Candida tropicalis, Aspergillus flavus, Aspergillus fumigatus, and Aspergillus niger.
- the primer design includes any one or more primers of Candida glabrata, Candida albicans / Candida tropicalis, Aspergillus flavus, Aspergillus fumigatus, and Aspergillus niger, as follows:
- Figure 1 is a schematic diagram of data splicing (1)
- Figure 2 is a schematic diagram of data stitching (2)
- Figure 3 is a schematic diagram of data stitching (3)
- Figure 4 is a schematic diagram of data stitching (4)
- FIG. 5 is a schematic diagram of blast data processing (1)
- FIG. 6 is a schematic diagram of blast data processing (2)
- Figure 8 is a schematic diagram of the comparison results of Candida tropicalis
- FIG. 10 is a schematic diagram of the comparison results of Aspergillus flavus
- FIG. 11 is a schematic diagram of the comparison results of Aspergillus fumigatus
- Figure 12 is a schematic diagram of the comparison results of Aspergillus niger.
- the DNA recovery solution obtained by centrifugation can be used for subsequent experiments.
- the extracted fungal DNA should not be placed at room temperature, and should be immediately stored at a temperature below -20 °C for long-term storage.
- the DNA recovery solution obtained by centrifugation can be used for subsequent experiments.
- the extracted fungal DNA should not be placed at room temperature, and should be immediately stored at a temperature below -20 °C for long-term storage.
- NanoDrop2000 to detect the sample concentration and purity.
- the detection scheme follows the standard operation procedure of NanoDrop2000.
- the main parameters set are :
- the length of the primer is generally 18 ⁇ 24bp;
- the theoretical annealing temperature Tm value is 55 °C ⁇ 65 °C;
- (G + C) content is 40% ⁇ 70%;
- the size of the amplified fragment is ⁇ 800bp.
- PCR amplification can be arranged, and the reaction system is 25ul.
- Sequencing PCR reaction The selected reagent is ADT's BDT3.1 sequencing kit (BigDyeTerminator v3.1), and the sequencing reaction is carried out according to the BDT3.1 manual. Sequencing PCR reaction cycle program is: pre-denaturation at 95 °C for 2min ⁇ (95 °C 30s, 50 °C 1min, 60 °C 4min) ⁇ 25 ⁇ 4 °C.
- SeqMan II not only can assemble thousands of sequences into contigs, but also can modify poor quality sequences and remove contaminated data from sequences in the early stage of assembly, as well as improved editing and output functions.
- the present invention can amplify the gene sequence of a specific species through specific primers, and verify the alignment through sequencing.
- the correspondence is one-to-one, and the accuracy rate is almost 100%.
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
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- Analytical Chemistry (AREA)
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- Biotechnology (AREA)
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- Immunology (AREA)
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- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
Description
Claims (3)
- 一种基于sanger测序快速鉴定人体真菌的方法,其特征在于,包括如下步骤:DNA提取和质检步骤:使用分泌物(真菌)DNA提取试剂盒进行DNA提取;使用NanoDrop2000检测样品浓度和纯度,当样品的浓度>10ng/uL和纯度在1.6~2.0之间,视为合格;引物设计和合成步骤:根据要扩增的目的基因序列,在在NCBI网站( http://www.ncbi.nlm.nih.gov/tools/primer-blast/index.cgi?LINK_LOC=BlastHome)上进行设计,设置的主要参数为:引物长度一般为18~24bp;理论退火温度Tm值55℃~65℃;(G+C)含量40%~70%;扩增片段大小<800bp;将设计出来的引物信息做好记录,包括引物名称,序列以及产物的大小;然后进行引物的合成;PCR扩增步骤:确认DNA模板质量合格的情况下,可以安排进行PCR扩增,反应体系为25ul;以基因组为模板选用New England Biolabs,Ltd Q5超保真DNA聚合酶进行PCR扩增;PCR产物纯化步骤:使用1.5%琼脂糖凝胶电泳对PCR扩增后的未纯化样品进行纯化;测序步骤:使用ABI公司的BDT3.1测序试剂盒进行测序的前处理后放入测序仪进行测序;数据处理步骤:使用拼接软件DNAStar进行拼接后使用blast方法进行处理。
- 如权利要求1所述的一种基于sanger测序快速鉴定人体真菌的方法,其特征在于,所述人体真菌包括光滑念珠菌、白色念珠菌/热带念珠菌、黄曲霉、烟曲霉、黑曲霉中的任意一种或多种。
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