CN114015788A - Genetic marker for intramuscular fat content character of pig and application - Google Patents
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Abstract
A genetic marker for intramuscular fat content of pig and its application are disclosed. The invention firstly provides a C > T base mutation at 1876bp of a nucleotide sequence of a pig EEPD1 gene as a molecular genetic marker related to the intramuscular fat content character of pigs. The invention obtains a genetic marker related to intramuscular fat content traits by preparation, and the nucleotide sequence of the genetic marker is shown in a sequence table SEQ ID NO: 1 and SEQ ID NO: 2, a C > T base mutation exists at the 796bp position, and the intramuscular fat content character of the pig can be obviously influenced. The invention also provides a preparation method of the genetic marker and application of the genetic marker in pig intramuscular fat content character correlation analysis. The invention provides a new genetic marker for the molecular marker-assisted breeding of the intramuscular fat content character of the pig.
Description
Technical Field
The invention belongs to the technical field of livestock genetic marker screening, and particularly relates to a genetic marker for intramuscular fat content traits of pigs and application thereof.
Background
With the development of socioeconomic and the improvement of the living standard of people, the market demand of high-quality pork with high quality, diversification and individual consumption demands is increased rapidly, but the current pork products with excellent comprehensive properties and distinct characteristics and meeting the taste of Chinese people are abundant, and the problem of mismatching of the market supply and demand of the pork products is gradually shown, so that the genetic improvement of the pork quality is more and more emphasized. Intramuscular Fat content (IMF) is an important index affecting meat quality traits, and is significantly related to tenderness, flavor and juiciness of pork (Lu et al 2008). However, the pork quality character is difficult to measure in vivo, and genetic improvement is difficult to carry out by using a conventional breeding technology, so that a key molecular genetic marker for controlling the pork quality character (particularly IMF) is searched, and the molecular auxiliary breeding applied to the character has important significance for improving the pork quality performance.
EEPD1 (endonuclear/Exonuclease/phosphophase Family Domain binding 1) encodes an Endonuclease/Exonuclease/Phosphatase Family Domain Containing protein 1 that plays a major role in the repair of stress replication forks during human DNA damage (Kim et al, 2017). Ji et al (2012) also found that the reduction of chicken EEPD1 gene expression level is related to fasting and insulin neutralizing capacity in the transcriptome analysis of chicken fat tissue, indicating that the gene has negative regulation effect on fatty acid synthesis. Li et al (2020) found that the EEPD1 gene was differentially expressed in longissimus waist muscles of Holstein bulls and castrated bulls using high throughput transcriptome sequencing technology, and that the bovine EEPD1 gene was associated with beef quality traits. However, the influence of the pig EEPD1 gene on meat quality traits is not reported.
The gene expression difference of the longest muscle tissue of the back of an IMF extreme individual is analyzed by the RNA-seq technology comparison in the prior period of the applicant, and the EEPD1 gene is found to be significantly differentially expressed. Therefore, the applicant amplifies a partial nucleotide sequence of the pig EEPD1 gene, and uses the sequence to perform screening and identification of polymorphic variation sites and correlation analysis research on IMF characters so as to obtain a new molecular marker related to the pig IMF characters.
Disclosure of Invention
The technical purpose of the invention is to amplify the second exon DNA sequence of the pig EEPD1 gene to search the mutation site polymorphism of the gene sequence, obtain a genetic marker related to the pig intramuscular fat content character, and use the genetic marker as the pig marker auxiliary selection.
In order to realize the technical purpose, the invention provides a genetic marker for the intramuscular fat content trait of pigs, which is a partial DNA sequence of a second exon of a pig EEPD1 gene, and the nucleotide sequence of the genetic marker is shown as SEQ ID NO: 1 and SEQ ID NO: 2, there is a C > T base mutation at the 796bp position of the sequence.
The invention also provides application of the genetic marker in auxiliary selection of the intramuscular fat content character marker of the pig.
Preferably, the application is the application of the prepared genetic variation marker in the correlation analysis of pig IMF traits.
The invention has the beneficial effects that: the invention provides a new genetic marker for the molecular marker-assisted breeding of the intramuscular fat content character of the pig.
Drawings
FIG. 1 is a general technical flow diagram of the present invention;
FIG. 2 is an agarose gel electrophoresis of the PCR amplification product of the second exon of the porcine EEPD1 gene of the present invention;
FIG. 3 shows the second exon g.1876C > T mutation site of the pig EEPD1 gene of SEQ ID NO: 4, sequencing map of primer reverse sequencing;
FIG. 4 is a nucleotide sequence of the second exon fragment of the pig EEPD1 gene as a visual representation (corresponding to the sequence listing shown in SEQ ID NO: 1 and SEQ ID NO: 2).
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 1 to 4, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise specified, the methods and parameters employed in the following examples are those conventional in the art.
It should be noted that:
sequence listing SEQ ID NO: 1 is the nucleotide sequence of the second exon of the amplified one 'Selenegia Bluehouse' EEPD1 gene, and the sequence length is 978 bp. There is a substitution of C > T base at base 796 of the sequence (the result shown in SEQ ID NO: 1 of the sequence Listing is the base that has been substituted);
sequence listing SEQ ID NO: 2 is the amplified nucleotide sequence of the second exon of the EEPD1 gene of the selenium-rich black pig, the sequence length is 978bp, and a T > C base substitution exists at the 796 th base of the sequence (the result shown in the sequence table SEQ ID NO: 2 is the base which is already substituted);
sequence listing SEQ ID NO: 3 is the amplification of SEQ ID NO: 1 and SEQ ID NO: 2 forward primer sequence for specific gene segment;
sequence listing SEQ ID NO: 4 is the amplification of SEQ ID NO: 1 and SEQ ID NO: 2 reverse primer sequence for specific gene segment;
in FIG. 2, lane M is 100bpDNA Ladder, and lanes 1 and 2 are amplified SEQ ID NO: 1 and SEQ ID NO: 2 a specific gene fragment;
the bold boxed letters in FIG. 4 indicate the presence of the mutation, the position of the mutation is divided to the 796 th base in the sequence, and the underlined sequence indicates the primer position.
The invention is realized by the following technical scheme:
the invention obtains a genetic marker of the intramuscular fat content character of pigs, which is a partial DNA fragment of a second exon of a pig EEPD1 gene, and the nucleotide sequence of the genetic marker is shown in a sequence table SEQ ID NO: 1 (length 978bp) and SEQ ID NO: 2 (length 978 bp). In SEQ ID NO: 1 and SEQ ID NO: 2 at 796 (as shown in figure 3).
The applicant provides a primer pair for amplifying a DNA fragment of a second exon portion of the pig EEPD1 gene, wherein the DNA sequence of the primer pair is shown as SEQ ID NO: 3 and SEQ ID NO: 4, respectively.
The applicant provides a method for preparing a genetic marker of a pig intramuscular fat content trait related gene EEPD1, which comprises the following steps:
specific primers (the sequences of the primers are shown as a sequence table SEQ ID NO: 3 and a sequence table SEQ ID NO: 4) are designed by referring to a second exon of a DNA sequence of a pig EEPD1 gene (accession number NC-010460.4) in a GenBank database, PCR amplification is carried out by taking a selenium-Du black pig genome DNA mixed pool as a template, and PCR products are recovered and subjected to DNA sequencing analysis to obtain a DNA sequence shown as a sequence table SEQ ID NO: 1 and SEQ ID NO: 2. The DNA sequence variation is screened according to the sequencing result, a C > T base mutation (namely an allelic mutation) exists at 796bp, and the genetic marker is shown in figure 3, and the genotype and the intramuscular fat content character in the selenium-rich black pig herd are analyzed and detected by using the genetic marker.
The invention provides a new genetic marker for the molecular marker-assisted breeding of the intramuscular fat content character of the pig.
Further details are given in the examples below.
Example 1 obtaining of pig EEPD1 Gene fragment and establishment of polymorphism detection method
1. Extraction of pig genomic DNA
The test pig variety is selenium-containing black pig, and the sample is from Hubei Tianli high-quality pig breeding Limited company. The selenium-rich black pig is a new black pig variety which is bred for 12 years by units such as animal husbandry and veterinary institute of agricultural and scientific institute of Hubei province, Hubei Tianli high-quality pig breeding company Limited and the like on the basis of Enshi black pigs, Meishan pigs, Hubei white pigs and the like. The extraction of the pig genome DNA adopts a genome DNA kit (operated according to the kit specification) produced by Beijing Baitacg biotechnology limited to extract, and the specific steps are as follows:
(1) taking the longissimus tissue of the back of a pig, putting the longissimus tissue into a 2mL centrifuge tube, adding 200 mu L of lysate TL, and blowing and beating uniformly by using a gun head;
(2) adding 20 μ L proteinase K (20mg/ml), vigorously reversing, mixing, and digesting in 55 deg.C water bath overnight;
(3) adding 200 μ L binding solution CB (provided by the kit), fully reversing and mixing uniformly, and standing at 70 ℃ for 10 min;
(4) cooling, adding 100 μ L isopropanol, violently reversing, and mixing;
(5) sucking the mixture by using a 1mL gun head, adding the mixture into an adsorption column AC, centrifuging the mixture at 10000rpm for 30s, and pouring waste liquid in a collecting pipe;
(6) adding 500 μ L of inhibitor removing solution IR (the kit is carried), centrifuging at 12000rpm for 30s, and discarding the waste solution;
(7) adding 700 μ L of rinsing liquid WB (carried by the kit), centrifuging at 12000rpm for 30s, and pouring off the waste liquid;
(8) repeating the operation step 7;
(9) putting the adsorption column AC back into the collection tube, centrifuging at 12000rpm for 2min, and removing the rinsing liquid as much as possible to prevent the residual ethanol from inhibiting downstream reaction;
(10) taking out the adsorption column AC, placing into a clean centrifuge tube, adding 50-100 μ L elution buffer EB (provided by the kit) to the middle part of the adsorption membrane, standing at room temperature for 3-5min, centrifuging at 12000rpm for 1min, and collecting the solution into the centrifuge tube;
(11) the concentration and quality of the extracted DNA are detected and stored at-20 ℃ for later use.
The remaining muscle specimen envelope was stored in dry ice and sent to the swine quality supervision and testing center (Wuhan) of the department of agriculture of Huazhong university of agriculture for IMF determination.
2. Obtaining second exon fragment of pig EEPD1 gene
(1) PCR amplification
The following primer pairs were designed based on the genomic sequence of the pig EEPD1 gene (GenBank accession No.: NC-010460.4):
forward primer EEPD 1-E2-F: 5'TTCGTGCCCTGACTCCTTC 3' of the formula I,
reverse primer EEPD 1-E2-R: 5'GGGTTGTTGGCCTTCTCC 3'.
The primers are used for carrying out PCR amplification in a mixed genome DNA pool of 37 selenium-rich black pigs, the concentration of each component in a PCR reaction system is 50 mu L, the concentration of each component in the system is 100ng template DNA, 4 mu L of 10 xbuffer (containing Mg2+), each upstream primer and downstream primer is 0.5 mu M, 2.5 mu M dNTPs and 1U TaqDNA polymerase.
The running program of PCR was: preheating at 95 ℃ for 2 min; denaturation at 94 ℃ for 20s, annealing at 57 ℃ for 40s, and extension at 72 ℃ for 60s for 35 cycles; extending for 10min at 72 ℃; storing at 4 ℃. The PCR product was detected by electrophoresis on a 1% agarose gel.
(2) PCR product purification
The PCR product was purified using the Gel Extraction Kit from Shanghai Biotechnology Ltd (according to the instructions of the Kit), and the specific steps were as follows: cutting off gel containing target fragment from agarose gel, placing into 1.5mL centrifuge tube, adding 400 μ L sol solution, heating in 50-60 deg.C water bath until the gel is completely melted, mixing uniformly every 2min while heating, and cooling to room temperature; placing the centrifugal column into a collecting tube, transferring the mixed solution to the centrifugal column, and standing at room temperature for 2 min; centrifuging at 12000r/min for 1min, and adsorbing the DNA onto the column; pouring waste liquid in the collecting pipe, putting the centrifugal column into the same collecting pipe, adding 700 mu L of eluent, and centrifuging for 1min at 12000 r/min; pouring the waste liquid in the collecting pipe, and centrifuging for 1min at 12000 r/min; placing the column into a pre-prepared sterilized 1.5mL centrifuge tube, adding 40 μ L eluent or double distilled water (Ph >7.0), and standing at room temperature or 37 deg.C for 2-3 min; centrifuging at 12000r/min for 1min, wherein the liquid in the centrifuge tube is the recovered DNA fragment.
3. Acquisition of variation site of second exon fragment of pig EEPD1 gene
The DNA fragments obtained by the above recovery were sent to Wuhan Olympic department, Splendid Biotechnology Limited and sequenced by ABI3730XL sequencer, and 1 single base mutation site (FIG. 3) was found, and C > T mutation (allelic mutation) was found at 1876p of EEPD1 genomic nucleotide sequence (i.e., the entire sequence) (GenBank NC-010460.4) (mutation sites corresponding to the second exon fragment of EEPD1 gene of the present invention, respectively, there was a C > T base mutation (allelic mutation) at 796bp of SEQ ID NO: 1 and a T > C base mutation (allelic mutation) at 796bp of SEQ ID NO: 2.
4. Molecular marker genotyping
And (3) taking a DNA sample of an individual to be detected as a template, amplifying a second exon sequence fragment of the pig EEPD1 gene according to the method in the step 2, directly sending the obtained PCR purified product to Wuhan Olympic department, Dingsheng, Biotech limited company for sequencing, and directly reading a genotyping result from a sequencing result.
Example 2 application of genetic variation marker prepared by the invention in pig IMF trait association analysis
The applicant detects the relevance of the two molecular genetic markers prepared by the invention and the pig IMF character in 256 selenium-rich black pig groups (from Hubei Tianli high-quality pig breeding Co., Ltd.).
Genotyping assays were performed using the PCR direct sequencing method established in example 1, and Statistical analysis was performed using SPSS Statistical software (Statistical Package for the Social Sciences, Version 17.0) general linear model GLM. The model used is: y isijklm＝μ+Gi+Aj+Xk+Sl+eijklmWherein: y isijklmRepresents an IMF value; mu tableShowing a population mean value; giIndicating a genotype effect; a. thejIndicating a seasonal effect; xkRepresenting a gender effect; slRepresenting a paternal effect; e.g. of the typeijklmRepresenting random residual effects. Results are expressed as least squares means ± standard error, P<0.05 judged as significant difference; p<The difference was judged to be extremely significant at 0.01.
The correlation analysis results are shown in Table 1, and the g.1876C > T pole is found to significantly affect the IMF trait (P < 0.01). The IMF of an individual carrying TT genotype is remarkably higher than that of an individual carrying CT and CC genotypes (P <0.01), the individual carrying CT genotype is remarkably higher than that of an individual carrying CC genotypes (P <0.05), the IMF has the trend of TT > CT > CC, and the T locus is a dominant allele of the IMF character. Individuals carrying TT genotypes should be preferentially reserved in breeding, and intramuscular fat content characters of the populations can be improved.
TABLE 1 correlation analysis result of pig EEPD1 gene second exon g.1876C > T and IMF character
Table 1 notes: the shoulder marks represent that the data in the same row have obvious difference by different lower case letters, and P is less than 0.05; different capital letters indicate that the difference between data of the same row is very significant, P < 0.01.
Sequence listing
<110> institute of zootechnics of academy of agricultural sciences of Hubei province
<120> genetic marker for intramuscular fat content character of pig and application thereof
<141> 2021-11-22
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ttcgtgccct gactccttca ccttaccttt ttctgcgtct gtgaggtcta ccaggcttct 60
tctctagcca gcgagttctg cggtggtgag gccttcctgg gcccctgatc ctggccggcc 120
atggggagca cgctgggctg ccaccgctcc atcccccggg acccctcaga cctgtcccat 180
agccgcaagt tcagtgctgc ctgcaacttc agcaacatcc tggtgaacca ggagcggctc 240
aacatcaaca ccgccacgga ggaggagctg atgaccctgc ctggggtgac gcgtgcagtg 300
gcacgcagca tcgtggagta ccgcgagtac attggtggct tcaagaaggt ggaggacctg 360
gcgctggtca gtggcgtggg tgccaccaag ttggagcagg tcaagttcga gatctgcgtg 420
agcagcaagg gcagctccgc gcagcactct cccagctccc tgaggcggga cctgctggcc 480
gagcagcagc ctcaccacct ggccacctcc gtgcccctca ccccgcgcgt caacatcaac 540
acagccaccc ccgctcagct catgagcgtg cgtggcctca cggagaagat ggccatcagc 600
atcaacccgg gacagcgcgg ggcccgtgga ctaccgccgg gagcacggac ccttccgcag 660
cgtcgaggac ctggtgagga tgggcggcat caatgccgcc ttcctggaca ggatacggca 720
ccaggtgttt gccgagaggt ccaggccccc gtccacccac accaacgggg gcctgacctt 780
caccgccaag cctcacccca gccccacctc gctgagcttg cagagtgagg acctggacct 840
gccgccaggg ggacctacgc agatcatctc cacgcggcct tcggtggagg cctttggggg 900
cacaagggac gggcggcctg tgctgaggct ggccacctgg aacttgcagg gctgttcagt 960
ggagaaggcc aacaaccc 978
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ttcgtgccct gactccttca ccttaccttt ttctgcgtct gtgaggtcta ccaggcttct 60
tctctagcca gcgagttctg cggtggtgag gccttcctgg gcccctgatc ctggccggcc 120
atggggagca cgctgggctg ccaccgctcc atcccccggg acccctcaga cctgtcccat 180
agccgcaagt tcagtgctgc ctgcaacttc agcaacatcc tggtgaacca ggagcggctc 240
aacatcaaca ccgccacgga ggaggagctg atgaccctgc ctggggtgac gcgtgcagtg 300
gcacgcagca tcgtggagta ccgcgagtac attggtggct tcaagaaggt ggaggacctg 360
gcgctggtca gtggcgtggg tgccaccaag ttggagcagg tcaagttcga gatctgcgtg 420
agcagcaagg gcagctccgc gcagcactct cccagctccc tgaggcggga cctgctggcc 480
gagcagcagc ctcaccacct ggccacctcc gtgcccctca ccccgcgcgt caacatcaac 540
acagccaccc ccgctcagct catgagcgtg cgtggcctca cggagaagat ggccatcagc 600
atcaacccgg gacagcgcgg ggcccgtgga ctaccgccgg gagcacggac ccttccgcag 660
cgtcgaggac ctggtgagga tgggcggcat caatgccgcc ttcctggaca ggatacggca 720
ccaggtgttt gccgagaggt ccaggccccc gtccacccac accaacgggg gcctgacctt 780
caccgccaag cctcatccca gccccacctc gctgagcttg cagagtgagg acctggacct 840
gccgccaggg ggacctacgc agatcatctc cacgcggcct tcggtggagg cctttggggg 900
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ggagaaggcc aacaaccc 978
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Claims (3)
1. A genetic marker for the intramuscular fat content of pigs is a partial DNA sequence of a second exon of a pig EEPD1 gene, and the nucleotide sequence of the genetic marker is shown as SEQ ID NO: 1 and SEQ ID NO: 2, there is a C > T base mutation at the 796bp position of the sequence.
2. Use of the genetic marker of claim 1 in porcine intramuscular fat content trait marker assisted selection.
3. The use according to claim 2, characterized in that the genetic variation markers prepared are used in the association analysis of pig IMF traits.
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| CN114959066A (en) * | 2022-06-29 | 2022-08-30 | 湖北省农业科学院畜牧兽医研究所 | Molecular marker influencing intramuscular fat content traits of pigs and application |
| CN115323061A (en) * | 2022-06-29 | 2022-11-11 | 湖北省农业科学院畜牧兽医研究所 | Pig intramuscular fat content character related ADIG gene haplotype variation genetic marker and application |
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| CN114959066A (en) * | 2022-06-29 | 2022-08-30 | 湖北省农业科学院畜牧兽医研究所 | Molecular marker influencing intramuscular fat content traits of pigs and application |
| CN115323061A (en) * | 2022-06-29 | 2022-11-11 | 湖北省农业科学院畜牧兽医研究所 | Pig intramuscular fat content character related ADIG gene haplotype variation genetic marker and application |
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