NL2032310B1 - Kit and method for identifying eospalax fontanieri - Google Patents
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Abstract
The present disclosure provides a kit for identifying Eospalax fontanieri, including a reagent for detecting any one or more of the following three single—nucleotide polymorphism (SNP) sites of a species to be identified: a 37th position of a conserved motif sequence shown in SEQ ID NO: 5 and a 23rd position of a conserved motif sequence shown in SEQ ID NO: 6, in a 12S rRNA gene; and an 18th position of a conserved motif sequence shown in SEQ ID NO: 7 in a l6S rRNA gene. The present disclosure provides a simple and accurate kit for identifying E. fontanieri and a method for identifying the E. fontanieri. The present disclosure solves the problem. of identifying a zokor species by morphology, with an excellent prospect for use.
Description
P1434 /NL
KIT AND METHOD FOR IDENTIFYING ZOSPALAX FONTANIERI
The present disclosure belongs to the technical field of identification, and in particular relates to a kit and a method for identifying Eospalax fontanieri.
Zokor, as a collective name for animals of the subfamily Myo- spalacinae, is a rodent adapted to underground life. The zokor is stout and cylindrical in shape, with a broad and flat head and tentacles on the head, and has a flat and blunt nose with a bare nose pad, and a short tail and limbs. The zokor has extremely small eyes with poor vision, and is almost covered by hair, with its auricle degenerated and hidden under the hair. The zokor is mainly distributed in China, but also found in Mongolia and Sibe- ria, and inhabits forest edges, grasslands and farmland. The zokor lives in burrows during the day and occasionally goes to the ground at night, feeding on the roots, stems and seeds of plants, and storing a lot of food in the burrows. The zokor can dig bur- rows in an extremely high rate. The burrow has a complex system with many branches. Generally, there is no obvious exit of the burrow on the ground, but there are irregular mounds nearby.
The extant zokor includes Eospalax and Myospalax. There are few species in the genus Myospalax, and it is generally believed that there are three species at current, namely M. aspalax, M. myospalax and M. psilurus. The Eospalax includes 6 species of E. fontanieri, E. smithi, E. rothschildi, E. baileyi, E. cansus, and
E. rufescens. The zokor lives in a closed underground tunnel sys- tem almost all its life. A unique underground lifestyle makes the zokor special in many aspects such as foraging, mating, and repro- duction, which have aroused the wide interest of scientists.
It is the basis for understanding and protecting biodiversity by identifying and identifying biological species. Only after each species is accurately identified to conduct more fields of re-
search. However, since different zokor species have similar mor- phologies due to similar living environments, it is extremely dif- ficult to accurately identify species through morphology without professional training.
Therefore, it is extremely is to research a method and re- agent capable of quickly and accurately identifying the E. fonta- nieri.
A purpose of the present disclosure is to provide a kit and a method capable of easily and accurately identifying E. fontanieri, which can solve the problem of identifying zokor species by mor- phology.
The present disclosure provides a kit for identifying E. fon- tanieri, including a reagent for detecting any one or more of the following three single-nucleotide polymorphism (SNP) sites of a species to be identified: a 37th position of a conserved motif sequence shown in SEQ ID
NO: 5 and a 23rd position of a conserved motif sequence shown in
SEQ ID NO: 6, in a 12S rRNA gene; and an 18th position of a conserved motif sequence shown in SEQ
ID NO: 7 in a 16S rRNA gene.
Further, the reagent may be capable of simultaneously detec- ting the three SNP sites; or the SNP sites may have bases as follows: the 37th position of the conserved motif sequence shown in
SEQ ID NO: 5 is A and the 23rd position of the conserved motif se- quence shown in SEQ ID NO: 6 is T, in the 1235 rRNA gene; and the 18th position of the conserved motif sequence shown in
SEQ ID NO: 7 is T in the 16S rRNA gene.
After research, it is found that the three SNP sites ge- nerally exist at the same time, that is, when a 37th base of the conserved motif sequence shown in SEQ ID NO: 5 is A, a 23rd base of the conserved motif sequence shown in SEQ ID NO: 6 is T, and an 18th base of the conserved motif sequence shown in SEQ ID NO: 7 is
T. Further experiments have also found that only a genome of the
E. fontanieri has the three SNP sites. Therefore, by detecting any one or more of the three SNP sites, it is possible to identify whether a species to be identified is the E. fontanieri.
Further, the reagent may be used for sequencing, a kompetiti- ve allele-specific PCR (KASP) method, or a restriction fragment length polymorphism (RFLP) method.
Furthermore, the kit may further include a reagent for ampli- fying a conserved motif sequence of the 123 rRNA gene and/or the 16S rRNA gene; where the conserved motif sequence is any one or more sequences shown in SEQ ID NO: 5 to SEQ ID NO: 7.
Further, the reagent for amplifying the conserved motif se- quence of the 12S rRNA gene may include a primer pair shown in SEQ
ID NO: 1 and SEQ ID NO: 2; and the reagent for amplifying the con- served motif sequence of the 16S rRNA gene may include a primer pair shown in SEQ ID NO: 3 and SEQ ID NO: 4.
The present disclosure further provides use of a reagent for amplifying a conserved motif sequence of a 12S rRNA gene and/or a 16S rRNA gene in a kit for identifying E. fontanieri, where the conserved motif sequence is any one or more sequences shown in SEQ
ID NO: 5 to SEQ ID NO: 7; and preferably, the reagent includes a primer pair shown in SEQ
ID NO: 1 to SEQ ID NO: 2 and/or a primer pair shown in SEQ ID NO: 3 to SEQ ID NO: 4.
The present disclosure further provides a method for identi- fying E. fontanieri, including the following steps: (1) extracting a total genomic DNA of a sample of a zokor to be identified; and (2) detecting any one or more of the following three SNP si- tes, and conducting analysis: a 37th position of a conserved motif sequence shown in SEQ ID
NO: 5 and a 23rd position of a conserved motif sequence shown in
SEQ ID NO: 6, in a 128 rRNA gene; and an 18th position of a conserved motif sequence shown in SEQ
ID NO: 7 in a 16S rRNA gene.
Preferably, in step {1}, the sample may be a tissue sample or a blood sample.
Further, in step (2), the detecting may specifically include: 1) conducting PCR amplification with an amplification reagent using the DNA extracted in step (1) as a template, to obtain an amplification product; 2) conducting agarose gel electrophoresis detection on the
PCR amplification product obtained in step 1); 3) sequencing a PCR amplification product of the 12S rRNA ge- ne with a bright band at 490 bp and/or a PCR amplification product of the 16S rRNA gene with a bright band at 1,450 bp in a detection result obtained in step 2), to obtain a sequence of the 12S rRNA gene and/or the 163 rRNA gene; and 4) conducting analysis on one or more of the following three
SNP sites in the sequence of the 12S rRNA gene and/or the 16S rRNA gene obtained in step 3): the 37th position of the conserved motif sequence shown in SEQ ID NO: 5 and the 23rd position of the con- served motif sequence shown in SEQ ID NO: 6, in the 123 rRNA gene; and the 18th position of the conserved motif sequence shown in SEQ
ID NO: 7 in the 163 rRNA gene; and preferably, in step 1), the amplification reagent may include a primer pair shown in SEQ ID NO: 1 and SEQ ID NO: 2 and/or a pri- mer pair shown in SEQ ID NO: 3 and SEQ ID NO: 4; the PCR amplifi- cation may have a annealing temperature of 52°C to 56°C; and in step 3), the sequencing may be bidirecticnal Sanger sequencing.
Furthermore, in step (2), the detecting may be to detect the three SNP sites simultaneously; or
Furthermore, if bases of the SNP sites are as follows, the zokor to be identified may be FE. fontanieri: the 37th position of the conserved motif sequence shown in
SEQ ID NO: 5 is A and the 23rd position of the conserved motif se- quence shown in SEQ ID NO: 6 is T, in the 1235 rRNA gene; and the 18th position of the conserved motif sequence shown in
SEQ ID NO: 7 is T in the 16S rRNA gene.
Beneficial effects of the present disclosure are:
In the present disclosure, the three specific SNP genotypes of the E. fontanieri appear simultaneously in a fragment (DNA bar- code) of the 125 rRNA gene and the 16S rRNA gene, and if one or more of the three SNP sites are detected, it can be determined that a to-be-identified zokor is the E. fontanieri, such that the- re is a low requirement for a sequencing length. The three SNP si-
tes with specific genotypes of the E. fontanieri are used to iden- tify zokor species, and the SNP sites can be mutually confirmed, such that obtained results are more accurate and reliable.
In the present disclosure, a key point is to discover a rela- 5 tionship between the three SNP sites in the conserved motif se- quence of the 12S rRNA gene fragment and the 163 rRNA gene frag- ment of zokor and the E. fontanieri. On this basis, any reagent or equipment capable of detecting any one or more bases of the SNP sites can be used for species identification of the E. fontanieri.
Specifically, in examples of the present disclosure, the SNP sites are detected by sequencing. The primer pair has desirable specificity, and has no non-specific amplification with DNA frag- ments other than the target when conducting PCR; an amplified tar- get gene is a mitochondrial single-copy gene that can be directly used for sequencing through a simple method without cloning. Three conserved motif sequences of E. fontanieri are further provided to assist in determining a position of the specific SNP sites of FE. fontanieri in the fragment (DNA barcode) of the 12s rRNA gene and the 1635 rRNA gene, which is convenient for determination of a ge- notype of the SNP site.
Obviously, according to the above-mentioned content of the present disclosure and on the basis of common technical knowledge and common methods in the field, various other modifications, sub- stitutions or alterations can be made without departing from the above-mentioned basic technical idea of the present disclosure.
The above-mentioned content of the present disclosure will be further described in detail below through specific implementations in the form of examples. However, it should not be construed that the subject of the present disclosure is limited to the following examples. Instead, technologies implemented based on the content of the present disclosure should fall within the scope of the pre- sent disclosure.
FIG. 1 shows a sequence peak diagram (a first motif sequence) of a PCR product of a 12S rRNA gene of a zokor numbered ZYX-4 in
Example 5;
FIG. 2 shows a sequence peak diagram (a second motif sequen- ce) of the PCR product of the 125 rRNA gene of the zokor numbered
ZYX-4 in Example 5;
FIG. 3 shows a sequence peak diagram (a reverse complement of a third motif sequence) of a PCR product of a 16S rRNA gene of the zokor numbered ZYX-4 in Example 5;
FIG. 4 shows a sequence peak diagram (a sequence at the first motif) of a PCR product of a 12S rRNA gene of a zokor numbered
DLL-5 in Example 5;
FIG. 5 shows a sequence peak diagram (a sequence at the se- cond motif) of the PCR product of the 125 rRNA gene of the zokor numbered DLL-5 in Example 5; and
FIG. 6 shows a sequence peak diagram (a reverse complement sequence at the third motif) of a PCR product of a 16S rRNA gene in a primer pair of a zokor numbered DLL-5 in Example 5.
For a clearer understanding, the present disclosure is fur- ther described with reference to the following examples and accom- panying drawings. The examples are for illustration only and do not limit the present disclosure in any way.
The experimental methods that do not indicate specific condi- tions in the examples are conventional methods and conventional conditions well known in the art, or according to the conditions suggested by the manufacturer; various chemical reagents used in the examples are comercially available, and the primers are en- trusted to be synthesized.
Example 1 Kit for identifying E. fontanieri
Components of the kit included: {1) a PCR amplification reagent: including a primer pair shown in SEQ ID NO: 1 to SEQ ID NO: 2; (2) a reagent for sequen- cing.
Example 2 Kit for identifying E. fontanieri
Components of the kit included: (1) a PCR amplification reagent: including a primer pair shown in SEQ ID NO: 3 to SEQ ID NO: 4; (2) a reagent for sequen- cing.
Example 3 Kit for identifying E. fontanieri
Components of the kit included: (1) a PCR amplification reagent: including primer pairs shown in SEQ ID NO: 1 to SEQ ID NO: 2 and SEQ ID NO: 3 to SEQ ID NO: 4; (2) a reagent for sequencing.
Example 4 Design of PCR primers and verification of SNP sites
The mitochondrial genome sequences of 121 zokor individuals from 8 zokor species were compared, and it was found that there were 2 E. fontanieri-specific SNP genotypes in the 1235 rRNA gene, and 1 E. fontanieri-specific SNP genotype in the 163 rRNA gene; there were conserved sequences at both ends of these three SNP si- tes, such that the 12S rRNA gene fragment and the 16S rRNA gene fragment were determined as a DNA barcode for the identification of E. fontanieri.
The 121 zokor individuals from 8 zokor species specifically included: 12 M. aspalax, 10 M. psilurus, 15 E. fontanieri, 18 E. smithi, 16 E. rothschildi, 14 FE. baileyi, 24 E. cansus, and 12 E. rufescens.
The primers were designed for the 12S rRNA, the 16S rRNA and nearby gene sequences in a conserved region as follows:
ME12S-1L: AGCACTGAAAATGCTTAGATGG (SEQ ID NO: 1};
ME12S-1R: CGGCTAAGCATAGTGGGGGTA (SEQ ID NO: 2).
ME16S-1L: AGAGGAGATAAGTCGTAACAAGGT (SEQ ID NO: 3);
ME16S-1R: TCCTGATCCAACATCGAGGT (SEQ ID NO: 4).
DNA samples of different zokor species were amplified using the primer pairs to confirm 3 SNP sites in the 125 rRNA gene and the 16S rRNA gene for the identification of E. fontanieri, as fol- lows: 1) a genotype of a 307th base (a 37th base of the conserved motif sequence shown in SEQ ID NO: 5) of an amplification product of the 123 rRNA gene of E. fontanieri is A, while a genotype of the site in other zokor species is G; 2) a genotype of a 347th base (a 23rd base of the conserved motif sequence shown in SEQ ID NO: 6) of an amplification product of the 123 rRNA gene of E. fontanieri is T, while a genotype of the site in other zokor species is A or G; and 3) a genotype of a 1304th base (an 18th base of the conserved motif sequence shown in SEQ ID NO: 7) of an amplification product of the 163 rRNA gene of E. fontanieri is T, while a genotype of the site in other zokor species is C.
Example 5 Species identification of E. fontanieri
A primer pair (SEQ ID NO: 1 and SEQ ID NO: 2) was synthesized for a 123 rRNA gene fragment, and a primer pair (SEQ ID NO: 3 and
SEQ ID NO: 4) was synthesized for a 163 rRNA gene fragment.
Identification was conducted by the following method: a) a Qiagen's DNeasy Blood & Tissue Kit was used to extract a total genomic DNA of a muscle tissue of a zokor numbered JX-5, a total genomic DNA of a muscle tissue of a zokor numbered ZYX-4, and a total genomic DNA of a liver tissue of a zokor numbered DLL- 57 b) a PCR reaction was conducted with the primer pair of 128 rRNA and the primer pair of 16S rRNA using the total genomic DNAs of the zokors numbered ZYX-4 and DLL-5 obtained in step a) as tem- plates, where a ZYX-4 reaction system was 25 uL at an annealing temperature of 56°C; a DLL-5 reaction system was 25 pL at an anne- aling temperature of 55°C; while a PCR reaction was conducted with the primer pair of 12S rRNA using the total genomic DNA of the zokor numbered JX-5 obtained in step a) as a template, where a J¥- 5 reaction system was 25 uL at an annealing temperature of 52°C; c) a PCR product obtained in step b) was detected by 1% aga- rose gel electrophoresis, and bright bands of about 490 bp and about 1,450 bp were observed; d) bidirectional Sanger sequencing was conducted on the PCR product obtained in step c) to obtain sequencing peak diagrams of the 12S rRNA gene and the 165 rRNA gene; and e) conserved motif sequences shown in SEQ ID NO: 5 to SEQ ID
NO: 7 were found in the sequencing peak diagrams, and bases of the
SNP sites were analyzed.
The results were as follows: (1) ZYX-4 zokor: in the sequence of SEQ ID NO: 5, a 37th base is A (FIG. 1); in the sequence of SEQ ID NO: 6, a 23rd base is T (FIG. 2); and in the sequence of SEQ ID NO: 7, an 18th base is T (FIG. 3).
Therefore, it is determined that the sample numbered ZYX-4 is
E. fontanieri. (2) JX-5 zokor: in the sequence of SEQ ID NO: 5, a 37th base is A.
Therefore, it is determined that the sample numbered JX-5 is
E. fontanieri. {3) DLL-5 zokor: in the sequence of SEQ ID NO: 5, a 37th base is not A (FIG. 4); in the sequence of SEQ ID NO: 6, a 23rd base is not T (FIG. 5); and in the sequence of SEQ ID NO: 7, an 18th base is not T (FIG. 6).
Therefore, it is determined that the sample numbered DLL-5 is not EZ. fontanieri.
In addition, the zokors numbered JX-5, ZYX-4 and DLL-5 were identified by a traditional morphological identification method.
In the JX-5 and ZYX-4 zokors, the body is large with white spots on the forehead, the nose pad is oval, the tail is relative- ly long with no hair; the cranial occipital part of the skull is raised, the nose pad is oval and the zygomatic arch is slightly extended, a widest point of the zygomatic arch is at the rear; the ridge crest is parallel, and the supraorbital ridge and middle oc- cipital ridge are underdeveloped; the incisor foramen is sur- rounded by the premaxilla and maxilla, and the third upper molar (M?) has a posterior extension lobe. These characteristics are con- sistent with the E. fontanieri, indicating that the two zokors are
E. fontanieri.
In DLL-5, the body is small, the front claws are obviously slender, the nose pad is mitral, and the tail is densely haired; the cranial occipital part of the skull is raised, the zygomatic arch is extended, and the ridge crest is parallel, not close to the raphe, but folded and close to the frontal part, and then com- bined with the developed supraorbital ridge forward; the incisor foramen is surrounded by the premaxilla and maxilla. These charac- teristics are in line with the morphological identification cha- racteristics of E. rothschildi, confirming that the DLL-5 zokor is
E. rothschildi, not E. fontanieri.
The experimental results show that the method for identifying
E. fontanieri of the present disclosure is accurate, and can be actually used for the identification and detection of the E. fon-
tanieri.
The present disclosure provides a simple and accurate kit for identifying E. fontanieri and a method for identifying the E. fon- tanieri. The present disclosure solves the problem of identifying a zokor species by morphology, with an excellent prospect for use.
<110> Northwest Institute of Plateau Biology, Chinese Acade- my of Sciences <120> KIT AND METHOD FOR IDENTIFYING EOSPALAX FONTANIERI <130> HKJP20220400652 <160> 7 <170> PatentIn version 3.5 <210> 1 <211> 22 <212> DNA <213> Artificial Sequence <220> <223> primer for amplifying conserved motif sequence of 125 rRNA gene <400> 1 agcactgaaa atgcttagat gg 22 <210> 2 <211> 20 <212> DNA <213> Artificial Sequence <220> <223> primer for amplifying conserved motif sequence of 125 rRNA gene
<400> 2 cggctaagca tagtggggta 20
<210> 3 <211> 24 <212> DNA <213> Artificial Sequence
<220> <223> primer for amplifying conserved motif sequence of 1685 rRNA gene <400> 3 agaggagata agtcgtaaca aggt 24 <210> 4 <211> 20 <212> DNA <213> Artificial Sequence <220> <223> primer for amplifying conserved motif sequence of 1685 rRNA gene <400> 4 tcctgatcca acatcgaggt 20
<210> 5 <211> 44 <212> DNA
<213> Eospalax fontanieri
<400> 5 ggtaaatttc gtgccagcca ccgcggtcat acgattaacc caaa 44
<210> 6
<211> 24
<212> DNA <213> Eospalax fontanieri i
<400> 6 catcggcgta aagcgtacaa catg 24
<210> 7
<211> 37
<212> DNA
<213> Eospalax fontanieri
<400> 7 cctccgaata acaaaactaa gacctacaag tcaaagt 37
<110> Northwest Institute of Plateau Biology, Chinese Academy of
Sciences <120> KIT AND METHOD FOR IDENTIFYING EOSPALAX FONTANIERI <130> HKJIP20220400652 <160> 7 <170> PatentIn version 3.5 <21e> 1 <211> 22 <212> DNA <213> Artificial Sequence <220> <223> primer for amplifying conserved motif sequence of 12S rRNA gene <400> 1 agcactgaaa atgcttagat gg 22 <2105 2 <211> 20 <212> DNA <213> Artificial Sequence <220> <223> primer for amplifying conserved motif sequence of 12S rRNA gene <400> 2 cggctaagca tagtggggta 20 <2105 3 <211> 24 <212> DNA <213> Artificial Sequence <220> <223> primer for amplifying conserved motif sequence of 16S rRNA gene <400> 3 agaggagata agtcgtaaca aggt 24 <2105 4 <211> 20 <212> DNA <213> Artificial Sequence
<220>
<223> primer for amplifying conserved motif sequence of 16S rRNA gene <400> 4 tcctgatcca acatcgaggt 20 <210> 5
<211> 44
<212> DNA
<213> Eospalax fontanieri
<400> 5 ggtaaatttc gtgccagcca ccgcggtcat acgattaacc caaa 44 <210> 6
<211> 24
<212> DNA
<213> Eospalax fontanieri
<400> 6 catcggcgta aagcgtacaa catg 24 <210> 7
<211> 37
<212> DNA
<213> Eospalax fontanieri
<400> 7 cctccgaata acaaaactaa gacctacaag tcaaagt 37
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CN107058492A (en) * | 2017-01-12 | 2017-08-18 | 中国人民解放军第二军医大学 | The method and kit of a kind of pvuii restriction fragment for identifying naked mole mitochondrial cytochrome b genes |
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