CN109652493B - Use of genus oscillatoria for identifying and/or differentiating individuals of different ethnic groups - Google Patents
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Abstract
The invention provides application of a microbial marker in identifying and/or distinguishing different ethnic groups of individuals, wherein the microbial marker is oscillatoria.
Description
Technical Field
The invention belongs to the field of biological identification and/or differentiation, and particularly relates to application of oscillatoria in identification and/or differentiation of different ethnic individuals.
Background
There is a large number of commensal flora in the human intestinal tract, which number exceeds 1000 trillion and is about 10 times of the total number of human cells. Meanwhile, the number of microbial genes in the intestinal tract is about 300 ten thousand, which is about 100 times of the number of human genome genes, so that the mass of genes can help the microbes to adapt to changeable environments, and an inseparable symbiotic relationship with a human body is formed. Residents with different genetic backgrounds and living habits have large differences in the composition of intestinal flora, for example, bacteroides is the bacterial genus with the highest relative content in intestinal tracts of western residents and the largest difference among individuals, and korean residents are copromorphus. At present, the research data of the structural difference comparison of intestinal flora of different nationalities in China is insufficient.
Studies in the Master's academic paper "study on differences between healthy control intestinal flora and breast cancer patients in Han nationality and Uygur nationality" by Cumin Baidan and Afei show that there is a significant difference in the structural ratio between the intestinal flora of healthy Han nationality women and healthy Uygur nationality women, and the results may be related to differences in genotype and dietary structure.
Genus Xenorhabdus, phylum firmicutes, Camptothecae. Previous studies have shown that the relative abundance of oscillatoria in the gut of healthy people is significantly higher than that of people with crohn's disease. So far, no report that the detection of the relative abundance of the oscillatoria in the feces is applied to identifying and/or differentiating people is available.
Disclosure of Invention
In a first aspect, the present invention provides the use of a microbial marker in the identification and/or differentiation of individuals of different ethnic groups, said microbial marker being of the genus oscillatoria.
The genus oscillatoria includes oscillatoria (Oscillibacter valerigenes).
The different nationalities are Tibetan nationalities and Han nationalities, and preferably Tibetan nationalities and Han nationalities on plateaus.
The plateau is above the altitude of 2000m and has the conditions of low pressure and oxygen deficiency.
Further preferably, the plateau environment is above an altitude of 2700m and has low pressure and oxygen deficiency.
In one embodiment of the present invention, the plateau environment is above 3500m in altitude, and has low pressure and oxygen-deficient conditions.
In one embodiment of the present invention, the plateau environment is above 5500m in altitude, and has low pressure and oxygen-deficient conditions.
In a second aspect, the present invention provides a method of identifying and/or differentiating between individuals of different ethnic groups, the method comprising the steps of:
(1) determining the abundance of a microbial marker in the stool or intestinal contents of said individual;
(2) comparing the abundance value of the microbial marker with a threshold value to know the ethnicity of the individual.
Preferably, the abundance of the microbial marker is determined by a sequencing method in the step (1).
More preferably, the step (1) comprises:
1) collecting the excrement or intestinal contents of an individual to be detected, and extracting the DNA of microorganisms in the excrement or the intestinal contents;
2) amplifying a target fragment;
3) sequencing;
4) and (4) calculating the abundance of the microbial marker.
The method for extracting the DNA of the microorganism in the excrement or intestinal contents in the step 1) is selected from the following steps: the CTAB method, the GITC method or the method using a commercial kit.
Preferably, the DNA of the microorganisms in the stool or intestinal contents is extracted using the CTAB method.
Specifically, collected excrement or intestinal contents are treated by CTAB, lysozyme and a lysis solution, then treated by phenol, chloroform and isoamylol to dissociate DNA and remove foreign proteins, the DNA is precipitated by isopropanol, and the DNA is purified by ethanol to obtain the DNA of microorganisms in the excrement or the intestinal contents.
More specifically, collecting the feces of the individual to be detected, sucking 500-: chloroform: isoamyl alcohol (20-30: 18-28: 1), reversing and mixing evenly, and centrifuging for 10-15min at 10000-12000 rpm. Taking the supernatant, adding chloroform: isoamyl alcohol (20-30: 1), reversing and mixing evenly, and centrifuging for 10-15min at 10000-. The supernatant was taken, added with isopropanol, shaken up and down and precipitated at-20 ℃. 10000-12000rpm for 10-15min, washing the precipitate with ethanol for 2-5 times, drying the precipitate, adding water to dissolve the precipitate, adding RNase A to digest RNA to obtain the DNA of the microorganism in the feces or intestinal contents.
And (2) amplifying the DNA obtained in the step (1) by using specific primers 515F and 806R with Barcode, wherein the sequence of the 515F is 5 '-GTGCCAGCMGCCGCGGTAA-3' (SEQ ID NO: 1) and 806R has a sequence of 5 '-GGACTACHVGGGTWTCTAAT-3' (SEQ ID NO: 2).
In the step 3), sequencing is carried out on the product obtained in the step (2) by using a high-throughput sequencing method.
And 4) clustering the data obtained by sequencing into OTUs (operational Taxonomic units), and calculating the abundance of the microbial markers after annotation analysis of the species.
Specifically, in the step 4), the data obtained by sequencing in the step 3) is processed, effective data is clustered into OTUs (operational Taxomic units) by using Upase software (Upase v7.0.1001, http:// www.drive5.com/uppase /), species annotation analysis is carried out on OTUs sequences by using a Mothur method and a SSURRNA database of SILVA (http:// www.arb-SILVA. de /), and the relative abundance of the microbial markers is expressed by (the OTU value of the microbial markers)/(the OTU values of all the genera detected by the detection sample).
And (2) comparing the measured abundance of the microbial marker with a threshold value, wherein one ethnic group is greater than the threshold value and the other ethnic group is smaller than the threshold value.
The threshold is the abundance of the microbial marker obtained when the john index of a working characteristic curve of the subject established after the detection of the abundance of the microbial marker is carried out on the population of the known ethnic group is the maximum value.
Preferably, the present invention provides a method for identifying and/or differentiating individuals into Tibetan or Han nationalities, the method comprising the steps of:
(1) determining the abundance of oscillatoria in the stool or intestinal contents of said subject;
(2) comparing the abundance of Xerocomus to a threshold of 1.51X 10-3When the abundance of oscillatoria in the feces or intestinal contents of the subject is greater than 1.51X 10-3The subject is a Tibetan patient, and the abundance of Citrobacter in the feces or intestinal contents of the subject is less than 1.51 × 10-3Then, thenThe individual is a Han nationality.
The step (1) comprises the following steps:
1) collecting the excrement or intestinal contents of an individual to be detected, and extracting the DNA of microorganisms in the excrement or the intestinal contents;
2) amplifying a target fragment;
3) sequencing;
4) the abundance of the genus oscillatoria was calculated.
The method for extracting the DNA of the microorganism in the excrement or intestinal contents in the step 1) is selected from the following steps: the CTAB method, the GITC method or the method using a commercial kit.
Preferably, the DNA of the microorganisms in the stool or intestinal contents is extracted using the CTAB method.
Specifically, collected excrement or intestinal contents are treated by CTAB, lysozyme and a lysis solution, then treated by phenol, chloroform and isoamylol to dissociate DNA and remove foreign proteins, the DNA is precipitated by isopropanol, and the DNA is purified by ethanol to obtain the DNA of microorganisms in the excrement or the intestinal contents.
More specifically, collecting the feces of the individual to be detected, sucking 500-: chloroform: isoamyl alcohol (20-30: 18-28: 1), reversing and mixing evenly, and centrifuging for 10-15min at 10000-12000 rpm. Taking the supernatant, adding chloroform: isoamyl alcohol (20-30: 1), reversing and mixing evenly, and centrifuging for 10-15min at 10000-. The supernatant was taken, added with isopropanol, shaken up and down and precipitated at-20 ℃. 10000-12000rpm for 10-15min, washing the precipitate with ethanol for 2-5 times, drying the precipitate, adding water to dissolve the precipitate, adding RNase A to digest RNA to obtain the DNA of the microorganism in the feces or intestinal contents.
And (2) amplifying the DNA obtained in the step (1) by using specific primers 515F and 806R with Barcode, wherein the sequence of the 515F is 5 '-GTGCCAGCMGCCGCGGTAA-3' (SEQ ID NO: 1) and 806R has a sequence of 5 '-GGACTACHVGGGTWTCTAAT-3' (SEQ ID NO: 2).
In the step 3), sequencing is carried out on the product obtained in the step (2) by using a high-throughput sequencing method.
And 4) clustering the data obtained by sequencing into OTUs (operational Taxonomic units) in the step 4), and calculating the abundance of the oscillatoria after annotation analysis of species.
Specifically, in the step 4), the data obtained by sequencing in the step 3) is processed, effective data is clustered into OTUs (operational Taxomic units) by using Upase software (Upase v7.0.1001, http:// www.drive5.com/uppase /), species annotation analysis is carried out on OTUs sequences by using a Mothur method and a SSURRNA database of SILVA (http:// www.arb-silva.de /), and the relative abundance of Bacillaria is represented by (the OTU value of Bacillaria)/(the OTU values of all the genera detected by the detection sample).
The genus oscillatoria includes oscillatoria (Oscillibacter valerigenes).
In a third aspect, the invention provides the use of a product for detecting the abundance of a microbial marker for identifying and/or differentiating between different ethnic groups of individuals.
The product for detecting the abundance of the microbial marker comprises a reagent, an apparatus or a device for detecting the abundance of the microbial marker.
Preferably, the product for detecting the abundance of the microbial marker is a product for detecting the abundance of oscillatoria.
The genus oscillatoria includes oscillatoria (Oscillibacter valerigenes).
Preferably, the identification and/or differentiation of different ethnic groups of individuals refers to identification and/or differentiation of individuals into Tibetan or Han nationality.
In a fourth aspect, the invention provides a product for identifying and/or differentiating between different ethnic groups of individuals, said product comprising a reagent, apparatus or device for detecting the abundance of a microbial marker.
Preferably, the product for identifying and/or distinguishing different ethnic groups of individuals is a product for identifying and/or distinguishing individuals of Tibetan or Han nationality.
Preferably, the product contains a reagent, an apparatus or a device for detecting the abundance of oscillatoria.
The genus oscillatoria includes oscillatoria (Oscillibacter valerigenes).
The abundance of a microorganism in the present invention refers to the abundance of that microorganism in a population of microorganisms, for example, the abundance of that microorganism in a population of intestinal microorganisms, and can be expressed as the amount of that microorganism in that population.
Drawings
FIG. 1: shown is the difference in relative abundance of oscillatoria in the hanzang intestinal group shown in boxplot;
FIG. 2: shown in the figure is that an ROC curve shows the sensitivity and specificity of differential diagnosis of Hanzang sources of plateau population by relative abundance of oscillatoria.
FIG. 3: is formed by the colony in the excrement of the Tibetan soldier group (Zang).
FIG. 4: colony composition in feces of Han group of soldiers (Han).
Detailed Description
Example 1 identification of subjects as Tibetan or Han Using the relative abundance of Bacillaceae in the feces of individuals
(1) Determining the abundance of said microbial marker in a fecal sample of said individual:
1) collecting the excrement of the individual to be detected, and extracting the DNA of microorganisms in the excrement:
collecting feces of an individual to be detected, sucking 1000ul CTAB lysate into a 2.0ml EP tube, adding lysozyme, adding about 500ul of sample into the lysate, carrying out water bath at 65 ℃, and reversing and mixing uniformly for several times during the period so as to fully crack the sample. The supernatant was centrifuged and phenol (pH 8.0) was added: chloroform: isoamyl alcohol (25: 24: 1), reverse mixing, and centrifuging at 12000rpm for 10 min. Taking the supernatant, adding chloroform: isoamyl alcohol (24: 1), reverse mixing, and centrifuging at 12000rpm for 10 min. The supernatant was aspirated into a 1.5mL centrifuge tube, isopropanol was added, shaken up and down, and precipitated at-20 ℃. Centrifuge at 12000rpm for 10 minutes and pour out the liquid, taking care not to pour out the pellet. Washing with 1ml 75% ethanol for 2 times, centrifuging again to collect the remaining small amount of liquid, and centrifugingSucking out with a gun head. And drying the clean bench or airing the clean bench at room temperature. Addition of ddH2O dissolving the DNA sample, adding RNase A1 ul to digest the RNA, and standing at 37 ℃ for 15 min. Then, the purity and concentration of the DNA are detected by agarose gel electrophoresis, an appropriate amount of sample DNA is taken out to a centrifuge tube, and the sample is diluted to 1 ng/mu l by using sterile water.
2) Amplification of the fragment of interest:
using the diluted genomic DNA as a template, specific primers with Barcode were selected according to the sequencing region 16S V3-V4:
515F：5’-GTGCCAGCMGCCGCGGTAA-3’（SEQ ID NO：1），
806R：5’-GGACTACHVGGGTWTCTAAT-3’（SEQ ID NO：2），
phusion High-Fidelity PCR Master Mix with GC Buffer from New England Biolabs company and High-efficiency High-Fidelity enzyme (TransFast Taq DNA Polymerase) to perform PCR, thereby ensuring the amplification efficiency and accuracy.
The PCR product is detected by electrophoresis by using agarose gel with 2 percent concentration; the PCR products were mixed in equal amounts according to the concentration of the PCR products, and after mixing well, the PCR products were purified by agarose gel electrophoresis using 1 XTAE 2%, and the target band was recovered by shearing. The product purification kit uses a recovery kit of GeneJET gel from Thermo Scientific company.
3) Sequencing:
construction of the Library is carried out by using Ion Plus Fragment Library Kit 48 rxns Library construction Kit of Thermofeisher company, and after the constructed Library is qualified by Qubit quantification and Library detection, on-machine sequencing is carried out by using Ion S5TMXL of Thermofeisher.
4) Calculating abundance of oscillatoria:
processing sequencing data: cutadapt (V1.9.1, http:// cutapt. readthetadocs. io/en/stable /) is used for carrying out low-quality partial shearing on Reads, then each sample data is split from the obtained Reads according to Barcode, the Barcode and primer sequence are cut off for preliminary quality control to obtain original data, the Reads obtained after the treatment needs to be treated for removing a chimera sequence, the Reads sequence is compared with a species annotation database to detect the chimera sequence, and finally the chimera sequence is removed, so that the final effective data are obtained.
OTU clustering and species annotation: all effective data of all samples are clustered by using Upearse software (Upearse v7.0.1001, http:// www.drive5.com/Uparse /), sequences are clustered into OTUs (operational Taxonomic units) by default with 97% consistency, representative sequences of the OTUs are selected at the same time, and the sequences with the highest frequency of occurrence in the OTUs are selected as the representative sequences of the OTUs according to the algorithm principle. Species annotation is carried out on OTUS sequences, species annotation analysis is carried out by a Mothur method and an SSUrRNA database of SILVA (http:// www.arb-SILVA. de /) (the threshold value is set to be 0.8-1), taxonomic information is obtained, and the community composition of Han soldiers and Tibetan soldiers is counted at the genus level respectively (see figures 3 and 4). The relative abundance of Xenorhabdus is expressed as (OTU value for Xenorhabdus)/(OTU value for all genera detected in the test samples).
(2) The abundance of oscillatoria in the feces of the individual to be detected is compared with 1.51 multiplied by 10-3By comparison, the abundance of Citrobacter in the feces or intestinal contents of an individual is greater than 1.51X 10-3The subject is a Tibetan patient, and the abundance of Citrobacter in the feces or intestinal contents of the subject is less than 1.51 × 10-3Then the individual is Han nationality.
Example 2 feasibility test for identifying ethnicity of subjects Using the relative abundance of Bacillaria
The study population is as follows:
the subject is a Chinese service male soldier, the experimental group is 128 Tibetan male soldiers with altitude higher than 3500m, and the comparison group is 128 plain Han soldiers age-matched with the Tibetan soldiers. Strictly controlling two groups of people to perform the same mixed diet of Chinese troops, keeping the same training environment and training intensity at the altitude of 3500m, and stopping smoking and drinking for 3 months. Soldiers with chronic inflammatory disease, oral antibiotics, acute infection and gastrointestinal disease were excluded.
The method comprises the following steps:
(1) determining the abundance of said microbial marker in a fecal sample of said individual:
1) collecting the excrement of the individual to be detected, and extracting the DNA of microorganisms in the excrement:
collecting feces of an individual to be detected, sucking 1000ul CTAB lysate into a 2.0ml EP tube, adding lysozyme, adding about 500ul of sample into the lysate, carrying out water bath at 65 ℃, and reversing and mixing uniformly for several times during the period so as to fully crack the sample. The supernatant was centrifuged and phenol (pH 8.0) was added: chloroform: isoamyl alcohol (25: 24: 1), reverse mixing, and centrifuging at 12000rpm for 10 min. Taking the supernatant, adding chloroform: isoamyl alcohol (24: 1), reverse mixing, and centrifuging at 12000rpm for 10 min. The supernatant was aspirated into a 1.5mL centrifuge tube, isopropanol was added, shaken up and down, and precipitated at-20 ℃. Centrifuge at 12000rpm for 10 minutes and pour out the liquid, taking care not to pour out the pellet. The column was washed 2 times with 1ml of 75% ethanol, and the remaining small amount of liquid was collected by centrifugation again and then aspirated out with a pipette tip. And drying the clean bench or airing the clean bench at room temperature. Addition of ddH2O dissolving the DNA sample, adding RNase A1 ul to digest the RNA, and standing at 37 ℃ for 15 min. Then, the purity and concentration of the DNA are detected by agarose gel electrophoresis, an appropriate amount of sample DNA is taken out to a centrifuge tube, and the sample is diluted to 1 ng/mu l by using sterile water.
2) Amplification of the fragment of interest:
using the diluted genomic DNA as a template, specific primers with Barcode were selected according to the sequencing region 16S V3-V4:
515F：5’-GTGCCAGCMGCCGCGGTAA-3’（SEQ ID NO：1），
806R：5’-GGACTACHVGGGTWTCTAAT-3’（SEQ ID NO：2），
phusion High-Fidelity PCR Master Mix with GC Buffer from New England Biolabs, and High-efficiency High-Fidelity enzyme to ensure the amplification efficiency and accuracy.
The PCR product is detected by electrophoresis by using agarose gel with 2 percent concentration; the PCR products were mixed in equal amounts according to the concentration of the PCR products, and after mixing well, the PCR products were purified by agarose gel electrophoresis using 1 XTAE 2%, and the target band was recovered by shearing. The product purification kit uses a recovery kit of GeneJET gel from Thermo Scientific company.
3) Sequencing:
construction of the Library is carried out by using Ion Plus Fragment Library Kit 48 rxns Library construction Kit of Thermofeisher company, and after the constructed Library is qualified by Qubit quantification and Library detection, on-machine sequencing is carried out by using Ion S5TMXL of Thermofeisher.
4) Calculating abundance of oscillatoria:
processing sequencing data: cutadapt (V1.9.1, http:// cutapt. readthetadocs. io/en/stable /) is used for carrying out low-quality partial shearing on Reads, then each sample data is split from the obtained Reads according to Barcode, the Barcode and primer sequence are cut off for preliminary quality control to obtain original data, the Reads obtained after the treatment needs to be treated for removing a chimera sequence, the Reads sequence is compared with a species annotation database to detect the chimera sequence, and finally the chimera sequence is removed, so that the final effective data are obtained.
OTU clustering and species annotation: all effective data of all samples are clustered by using Upearse software (Upearse v7.0.1001, http:// www.drive5.com/Uparse /), sequences are clustered into OTUs (operational Taxonomic units) by default with 97% consistency, representative sequences of the OTUs are selected at the same time, and the sequences with the highest frequency of occurrence in the OTUs are selected as the representative sequences of the OTUs according to the algorithm principle. Species annotation is carried out on OTUS sequences, species annotation analysis is carried out by a Mothur method and an SSUrRNA database of SILVA (http:// www.arb-SILVA. de /) (the threshold value is set to be 0.8-1), taxonomic information is obtained, and the community composition of Han soldiers and Tibetan soldiers is counted at the genus level respectively (see figures 3 and 4). The relative abundance of Xenorhabdus is expressed as (OTU value for Xenorhabdus)/(OTU value for all genera detected in the test samples).
As a result:
FIG. 1 is a box diagram showing the difference in relative abundance of Oscillatoria in Hanzang intestinal population, as shown in FIG. 1, the relative abundance of Oscillatoria in plateau Han population is 9.50X 10-4The relative abundance of oscillatoria in the population of high Tibetan is 1.63 × 10-3Hangzhi bacillus of Tibetan populationThe relative abundance of the Ke is obviously higher than that of the Han population.
The verification tests show that the relative abundance of Bacillaceae in the excrement of the individual can be used for identifying the ethnicity of the individual.
Example 3 construction of ROC Curve comparative evaluation of the ability of the relative abundance of strains to discriminate plateau Han and Tibetan populations
The capacity of the test subject for identifying plateau Han nationality people and Tibetan nationality people is judged by adopting a test subject working curve (ROC) method for verification and according to the relative abundance of the oscillatoria in the excrement of the test subject. Comparison of differences because the samples were non-normally distributed, Mann-Whitney test was used. And drawing an ROC curve to evaluate the sensitivity and specificity of relative abundance of the bacteria to differential diagnosis of plateau Han population and Tibetan population, calculating a threshold value, wherein P is less than 0.05, having statistical significance, and performing statistical processing by adopting an SPSS22.0 software package.
The results are shown in FIG. 2, and the results in FIG. 2 show that the ROC curve shows that the AUC (area under ROC curve) value of Hanzang source of the plateau population is 0.647, which indicates that the judgment on the relative abundance of oscillatoria is used for identifying the plateau Han population and the Tibetan population, and the relative abundance of the genus in the Han population is 1.51 multiplied by 10-3When the maximum Johnson index is 0.312, the sensitivity and the specificity are 0.768 and 0.544 respectively, the accuracy is 0.699, and the F1 score is 0.699, the method indicates that the plateau population source can be distinguished from Han nationality by detecting the relative abundance of the shigella quivalent by using 16SrRNA sequencing, and when the relative abundance of the shigella quivalent is more than 1.51 multiplied by 10-3Can be judged as Tibetan.
Sequence listing
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<120> use of genus oscillatoria for identifying and/or differentiating individuals of different ethnic groups
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<170> PatentIn version 3.5
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Claims (6)
1. The application of the microbial marker in identifying and/or distinguishing different ethnic groups of individuals is characterized in that the microbial marker is oscillatoria, the different ethnic groups are Tibetan on plateau and Han on plateau, the plateau is over 3500m in altitude, wherein the relative abundance of the oscillatoria is compared with a threshold value, and the threshold value is 1.51 multiplied by 10-3When the relative abundance of Bacillaceae in the feces or intestinal contents of an individual is greater than 1.51X 10-3The subject is a Tibetan patient, and the relative abundance of Xerocomus in the feces or intestinal contents of the subject is less than 1.51X 10-3Then the individual is Han, and the relative abundance is represented by "Oscillatoria OTU (operational Taxomic Unit)" value/"all genus OTU values detected by test sample".
2. Use of a microbial marker according to claim 1 for identifying and/or differentiating between different ethnic groups of individuals, wherein the genus oscillatoria comprises oscillatoria (oscillibacterperiogenes).
3. A method of identifying and/or differentiating individuals as zang nationalities or han nationalities, said method comprising the steps of:
(1) determining the relative abundance of oscillatoria in the stool or intestinal contents of said subject;
(2) comparing the relative abundance of Xerocomus to a threshold of 1.51X 10-3When the feces or intestinal tract of the subjectThe relative abundance of oscillatoria in the contents is greater than 1.51 × 10-3The subject is a Tibetan patient, and the relative abundance of Xerocomus in the feces or intestinal contents of the subject is less than 1.51X 10-3Then the individual is Han nationality;
wherein, the Tibetan or the Han is the Tibetan or the Han on the plateau, the plateau is the altitude of more than 3500m, and the relative abundance is represented by a ' Oscillatoriaceae OTU (operational Taxonomic Unit) ' value '/' all the bacteria OTU values detected by a detection sample '.
4. The method of claim 3, wherein the step (1) comprises:
1) collecting the excrement or intestinal contents of an individual to be detected, and extracting the DNA of microorganisms in the excrement or the intestinal contents;
2) amplifying a target fragment;
3) sequencing;
4) the relative abundance of oscillatoria was calculated.
5. Application of product for detecting relative abundance of microbial marker in identifying and/or distinguishing individuals of different ethnic groups, wherein the microbial marker is genus oscillatoria, the different ethnic groups are Tibetan on plateau and Han on plateau, the plateau is over 3500m in altitude, the relative abundance of genus oscillatoria is compared with a threshold value, and the threshold value is 1.51 multiplied by 10-3When the relative abundance of Bacillaceae in the feces or intestinal contents of an individual is greater than 1.51X 10-3The subject is a Tibetan patient, and the relative abundance of Xerocomus in the feces or intestinal contents of the subject is less than 1.51X 10-3Then the individual is Han, and the relative abundance is represented by "Oscillatoria OTU (operational Taxomic Unit)" value/"all genus OTU values detected by test sample".
6. The use of the product for detecting the relative abundance of a biomarker for identifying and/or differentiating different ethnic groups of individuals according to claim 5, wherein the product for detecting the relative abundance of a biomarker comprises a reagent, an apparatus or a device for detecting the relative abundance of a biomarker.
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