CN109182542A - One kind SNP marker relevant to chicken Carcass Traits and its application - Google Patents

One kind SNP marker relevant to chicken Carcass Traits and its application Download PDF

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CN109182542A
CN109182542A CN201811207113.3A CN201811207113A CN109182542A CN 109182542 A CN109182542 A CN 109182542A CN 201811207113 A CN201811207113 A CN 201811207113A CN 109182542 A CN109182542 A CN 109182542A
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snp
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CN109182542B (en
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罗文�
张细权
吴静文
陈庚华
蒋明雅
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South China Agricultural University
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Abstract

The invention discloses a kind of SNP marker relevant to chicken Carcass Traits and its applications in breeding, its described SNP marker corresponds to the g.526 G > A of the mutational site in chicken let-7b prosoma gene order, and the genotype of the SNP site is AA, GA and GG.SNP marker of the invention, g.526 G > A is related to chicken Carcass Traits in mutational site i.e. in chicken let-7b prosoma gene order, it is a new molecular labeling, by determining that the genotype of the chicken SNP site carries out Seedling selection to chicken Carcass Traits, production cost can be saved and accelerate genetic progress, it is preferably applied in a breed of chicken, with very big Economic Application value and scientific research value.

Description

One kind SNP marker relevant to chicken Carcass Traits and its application
Technical field
The present invention relates to technical field of gene detection, in particular to a kind of SNP marker relevant to chicken Carcass Traits And its application.
Background technique
MicroRNA (miRNA) is that there are about the endogenous non-coding single stranded RNAs of 22 or so nucleotide for one kind.With molecule The fast development of biological study technology and method, researcher have found more and more miRNA.MiRNA is by a segment length For 70~80 nucleotide and comprising being generated after the shearing of the miRNA precursor (pre-miRNA) of one section of hairpin structure.MiRNA is logical Crossing 3 ' end non-coding region (3-untranslated region, 3 ' UTR) complementations with its target gene mRNA leads to the mRNA Translation be suppressed and realize regulation to gene.Although miRNA non-direct coding protein, the RNA that it is encoded is in biology Entire life process in play an important role.Have now been found that miRNAs can participate in many adjusting approach, including skeletal muscle Development, the differentiation of virus defense mechanism, hematopoiesis, orga- nogenesis, cell Proliferation and death, fat metabolism etc..
In recent years, with the rapid development of the technologies such as genomics and whole-genome association, miRNA already becomes Popular domain in domestic and international Animal Genetics research.At home, Jin Jing etc. is using high throughput sequencing technologies to Holstein cow Lactation period high milk-quality milk cow (H) and lactation period low milk-quality milk cow (L) breast tissue have carried out miRNA sequencing, pass through difference Expression analysis screens group difference miRNAs, obtains 56 differential expression miRNA (P < 0.05), and to differential expression miRNA into Row microRNA target prediction, by being screened to target gene, it was found that 4 have been reported the functional gene being closely related with lactoprotein, butterfat: CSN3, SCD, LALBA and DGAT2.The biological function majority of target gene aggregation takes part in protein and fat metabolism, mammary gland hair It educates and breaks up and immune function.Ling Yinghui etc. carries out Solexa sequencing to goat musculature and carries out bioinformatics point Analysis identifies guard between 517 species and 2 distinctive miRNA of goat genome altogether.This seminar early period is pre- by target It surveys software prediction and the target site that real GHR and IGF2BP3 is let-7b, let- is tested by Dual-Luciferase target checking system The mrna expression amount that the overexpression of 7b will lead to GHR, IGF2BP3 is obviously lowered, it was demonstrated that let-7b has GHR, IGF2BP3 gene There is negative regulation effect, meanwhile, discovery let-7b influences JAK-STAT signal path by mediating GHR gene, to regulate and control The growth and development of skeletal muscle.There are many more reports to show that miRNAs widely participates in the growth and development, sexal maturity, mind of chicken embryo In proliferation and a series of vital movements such as differentiation and cell migration [29-33] through cell and muscle cell.
Single nucleotide polymorphism (Single Nucleotide Polymorphisms, SNP) refers to living individual genome The mutation that single nucleotide acid occurs in sequence.The frequency that SNPs occurs on DNA level is very high, high in all mutant forms Up to ninety percent or more, but wherein, many mutation all concentrate on noncoding region, other seldom mutation are distributed in the code area of gene.Have Evidence shows that SNP can have an impact RNA, DNA and protein level to the expression of gene and function, is to lead to individual and group Between body includes disease, the key factor of medicaments insensitive and phenotypic difference etc., the SNP on mature body and precursor sequence There is the target site for changing the mature body of its forming process even change or change the bond strength with target gene, causes miRNA's Function changes, to cause the variation of animal character.Each miRNA has more than one target site, this means that SNP on miRNA has great significance, therefore screens the SNPs in miRNA maturation body sequence and precursor sequence, discloses Its function gets a good eye meaning.Current lookup screening SNP is carried out with sanger sequencing or PCR-RFLP method, by Genechip technology and High-throughput lower in the efficiency of these technical methods, rapidly developing in recent years Sequencing can carry out efficient screening mutational site at the genomic level.Research shows that being located at miRNA seed zone SNP it is even more rare, and the SNP quantity that is present in miRNA prosoma is more is widely used in genetic diagnosis, tumor susceptibility The fields such as property.
The gene polymorphic of MiRNA can influence to transcribe by changing the target site of miRNA and changing the stability of mRNA Regulation after preceding and transcription then influences the expression of gene and the difference of phenotype.These polymorphic sites are expected as molecule mark Note is for the assisted Selection in breeding.Zhao etc. research 313 be only positioned at sheep exon 2 RXRG gene mutation and its with it is double It is more to analyze RXRG exon 1, exon 2, the gene of exon10 by PCR-SSCP for the relationship of tire character State property, the results showed that, 3 kinds of P2 fragment genotypes are significant related (P < 0.05) to the twining trait in group.It is blue virtuous brave etc. to pass through 45 parts of Inner Mongolia White Cashmere Goat α-lactalbumin (LALBA) genes carry out sequencing and parting, and with cashmere amount, cashmere is thick, cashmere Long and weight character is associated analysis.The results show that its exon 3 region there are 1 mutational site g.1897T > C.The position There are significant related (P < 0.05), TC genotype individuals velour yield ratio TT genotype individuals to velour yield for point different genotype Voluminous suede 142.68g, up to 26.21% (P < 0.05).Lei etc. (2010) experiments have shown that on miR27a gene T/C mutation with The litter size of pig is related.Huang carries out 187 ducks using PCR restriction fragment length polymorphism and micro sequence method SNP Genotyping.The hatching rate of CC genotype and TT genotype is respectively 79.59 ± 3.40 and 76.35 ± 1.77, significantly high In CT genotype (65.77 ± 2.07) (P < 0.0 5).
Let-7 family is a kind of miRNA found by Reinhart et al. in the beginning of this century.Let-7 family member difference On several different chromosomes.Research finds the gene of the let-7b targeting adjusting of one of let-7 family member in many Playing an important role in signal path, many signal paths are related with the Proliferation and apoptosis of cell, therefore grind there are many researcher Study carefully the relationship between let-7b and cell Proliferation.The researchs such as Sch μ Ltz discovery let-7b inhibits the cell of melanoma cells Cycle progression and growth independent of anchoring.Zhao etc. find under study for action let-7b can by targeting stem cell adjust because Sub- TLX and cell cycle regulatory factors cyclinD1 adjust the proliferation and differentiation of neural stem cell;Knockout then promotes nerve cord Cell Proliferation promotes Neural Differentiation;And overexpression let-7b can reduce nerve stem cell proliferation.Chen Nan is in zebra fish is tested It was found that the expression for inhibiting hypoxic inducing factor-1 (hif-1a) to will lead to let-7b is lowered, let-7b is overexpressed in ZF4 cell Cell cycle process can be changed, G1 phase to the S phase is excessive in arresting cell cycle, stops or slow down the proliferation of cell;Also pass through Experiment in vitro identifies that the target gene foxh1 of let-7b is also direct or indirect to take part in proliferation process.Qu Jie pass through by MiRlet-7b and anti-miRlet-7b carries out scratch experiment after transfecting to MCF-7 Breast Cancer Cell, as the result is shown let-7b energy The transfer ability of MCF-7 Breast Cancer Cell is enough significantly inhibited, and anti-miR let-7b group can remarkably promote breast cancer MCF- The migration of 7 cells, it was demonstrated that let-7b is able to suppress the transfer ability of MCF-7 Breast Cancer Cell.
Summary of the invention
It is an object of the invention to determine in chicken let-7b prosoma gene order mutational site g.526G > genotype of A To carry out Seedling selection to chicken Carcass Traits, saving production cost and to accelerate genetic progress, a kind of and chicken Carcass Traits are proposed Relevant molecular labeling and its application.
The technical solution used in the present invention is: a kind of SNP marker relevant to chicken Carcass Traits, the SNP Molecular labeling correspond to the mutational site in chicken let-7b prosoma gene order g.526G > A, the genotype of the SNP site is AA, GA and GG.
Application of the SNP marker in chicken genetic breeding.
The method of one breeder Carcass Traits Seedling selection, according to the genotype of above-mentioned SNP site to the Carcass Traits of chicken Seedling selection is carried out, is included the following steps:
1) chicken blood DNA to be measured is extracted;
2) chicken let-7b prosoma gene order is obtained from chicken blood DNA to be measured;
3) using DNA mix pond sequencing approach detection chicken let-7b prosoma gene order on SNP mutation site g.526G > A Genotype;
4) Seedling selection is carried out based on Carcass Traits of the genotype of step 2) SNP site to chicken, wherein AA genotype Body das Beinfleisch is great in GA and GG genotype individuals.
The beneficial effects of the present invention are: SNP marker of the invention, i.e., prominent in chicken let-7b prosoma gene order Displacement point g.526G > A is related to chicken Carcass Traits, is a new molecular labeling, by the genotype for determining the chicken SNP site Seedling selection is carried out to chicken Carcass Traits, production cost can be saved and accelerate genetic progress, be preferably applied for a breed of chicken In, with very big Economic Application value and scientific research value.
Detailed description of the invention
Fig. 1 is primer specificity test result in SNP detection;
Fig. 2 is SNP site abrupt information in chicken let-7b prosoma gene order.
Specific embodiment
The present invention is specifically described below with reference to embodiment, in order to technical field personnel to of the invention Understand.It is necessary to it is emphasized that embodiment is only intended to, the present invention will be further described herein, should not be understood as to this The limitation of invention protection scope, fields person skilled in the art, the non-intrinsically safe that the present invention is made according to foregoing invention content The modifications and adaptations of property, should still fall within protection scope of the present invention.Mentioned raw materials following simultaneously are unspecified, are Commercial product;The processing step or preparation method not referred in detail be processing step known to a person skilled in the art or Preparation method.
Embodiment
For the F2 that chicken to be measured is apricot bramble finch and recessive White Rock chicken giblets hand over for broiler chicken, quantity is 320, is supported using flat Feeding manner, feeding meet the corn-soybean meal feed of international formula standard, and recessive White Rock chicken is a kind of fast large-scale broiler chicken, And apricot bramble finch is the kind broiler chicken in Chinese Guangdong native country.Then measured respectively in 1~8 week old of chick its weight (BW, BodyWeight, unit g).Carry out butchering sampling at 3 monthly age, record respectively they shin length, wide, chest breadth, chest depth, Body length, chest angular width butcher weight, cortical thickness, remove internal organ weight, complete half net thorax weight, chest muscle leg flesh weight, plumage weight, abdominal fat weight, neck Weight, heart weight, liver weight, stomach weight and small intestine are long.Its shoulder is measured with chest angle device;Subcutaneous fat depth shin is long, fat is wide, it is wide, The long vernier caliper measurement of chest breadth, chest depth, body;The genomic DNA of all individuals is extracted according to conventional phenol/chloroform method, detects matter It is diluted to 50ng/ μ L after amount and concentration, 4 DEG C save backup.
One, apricot flower × recessive white F2 is extracted for resource population family full-sibs chicken blood DNA to be measured
(1) 100 μ L blood are extracted, 500 μ L buffer TE and 10 μ L Proteinase Ks are added, vibrate 30min, 2 μ L are added and split 55 DEG C of liquid digestion of solution are overnight;
(2) 600 μ L Tris saturated phenols are added, then vibrate 15s, 10000rpm is centrifuged 8min;
(3) supernatant is taken, isometric Tris saturated phenol is added, then vibrates 15s, 10000rpm is centrifuged 8min;
(4) supernatant is taken, it is phenol/chloroform/isoamyl alcohol=25:24:1 mixed liquor that isometric ratio, which is added, 10s is vibrated, 10000rpm is centrifuged 8min;
(5) supernatant is taken, isometric chloroform/isoamyl alcohol (24:1) is added, vibrates 10s, 10000rpm is centrifuged 8min;
(6) supernatant is taken, the dehydrated alcohol that 2 times of volumes pre-cool is added, 12000rpm is centrifuged 10min;
(7) supernatant is abandoned, 70% ethyl alcohol of 1mL is added and is rinsed, 12000rpm is centrifuged 10min;
(8) supernatant is abandoned, 2h is spontaneously dried, suitable buffer TE is added and is saved backup in 4 DEG C.
Two, SNP detection and DNA mix pond sequencing
1, SNP is detected:
From https: //www.ncbi.nlm.nih.gov/ finds let-7b prosoma gene order, and both wings sequence respectively expands 500bp is opened up, goes out primer pair, primer pair information (primer sequence 5 ' as shown in table 1 using 5.0 software design of Primer premier → 3 ') the primer pair sequence of design, is sent to the synthesis of Qing Ke biotech firm, and PCR is carried out to blood DNA with the primer pair, is surveyed The specificity for trying primer, as a result shown in attached drawing 1.
The primer information of 1 let-7b prosoma SNP of table screening
F:GTAAATCCACCTAGCGT
R:GCCCAGGAAATATGAA
2, DNA mixes pond sequencing:
It selects 30 DNA samples at random from the DNA gross sample of extraction and constructs mixed pond, (each sample is about for every three samples 0.33 μ L) it is mixed into a mixing sample, amount to 10.Mixed pond sample is subjected to PCR amplification, the primer and above-mentioned SNP are examined Primer pair used in survey is identical, the PCR product of acquisition is sent to the sequencing of Sheng Gong biotech firm, sequencing result detects to obtain chicken G.526G > A, sequencing result analysis are as shown in Fig. 2 in SNP mutation site in let-7b prosoma gene order.
Three, the genotype of let-7b prosoma mutational site g.526G > A is determined
By all chickens to be measured of embodiment, all progress PCR specific amplification obtains let-7b precursor to totally 320 parts of blood DNAs PCR product, used primer pair information are as shown in table 1), it is for statistical analysis available by the individual to each genotype The genotype frequency and gene frequency in the site.G.526G the gene of > A and genotype frequency count in the SNP mutation site Structure is as shown in table 2 below.Wherein:
(1) genotype frequency refers to that a certain genotype individuals number accounts for the ratio that genotype is summarized in group:
Genotype frequency=certain genotype sum/group sum × 100%;
(2) gene frequency refers to that a certain gene in group accounts for the ratio of its same site full gene:
Same locus gene sum × 100% in gene frequency=certain gene number/group.
G.526G the gene of > A and genotype frequency count in table 2 let-7b prosoma mutational site
AA genotype is chicken community superiority genotype to be measured it can be seen from 2 structure of table.
Four, the association analysis of SNP mutation site g.526G > A and the Carcass Traits of chicken
1, g.526G the Carcass Traits association analysis of the site > A is as shown in table 3 below for let-7b prosoma.By will g.526G > A site mutation information and carcass data relation analysis, wherein the site is presented significant related again to das Beinfleisch.The result of multiple comparisons is aobvious Show that AA genotype individuals das Beinfleisch is noticeably greater than GA and AA genotype individuals again, implies that the site may increase with muscle development and cell It is related to grow function.
The g.526G site the > A Carcass Traits association analysis of 3 let-7b prosoma of table
Carcass Traits AA GA GG P value
Slaughter weight (kg) 1.51±0.02(248) 1.44±0.04(37) 1.52±0.10(5) 0.3693
Slaughter traits (g) 1334.4±17.5(248) 1297.3±44.1(37) 1344.7±97.5(5) 0.7035
Subcutaneous fat depth (mm) 4.03±0.13(248) 4.01±0.32(37) 3.14±0.71(5) 0.4516
Fatty bandwidth (mm) 12.13±0.29(246) 11.89±0.73(37) 12.13±1.61(5) 0.9523
Half net thorax weight (g) 1223.5±15.3(247) 1149.1±38.0(37) 1236.3±84.1(5) 0.1639
Complete net thorax weight (g) 1058.5±13.6(247) 997.2±34.0(37) 1044.0±75.1(5) 0.2578
Brisket weight (g) 91.1±1.2(248) 89.4±3.0(37) 97.3±6.7(5) 0.467
Das Beinfleisch weight (g) 116.9±1.4a(247) 108.2±3.6b(37) 120.9±7.9ab(5) 0.0445
Wing weight (g) 65.1±0.8(247) 62.6±2.0(37) 70.6±4.4(5) 0.1361
Abdominal fat weight (g) 29.4±1.4(247) 22.7±3.5(37) 22.3±7.7(5) 0.2184
Head, neck weight (g) 124.0±1.8(247) 117.5±4.6(37) 123.1±10.1(5) 0.4255
Shin, pawl weight (g) 29.4±0.4(247) 27.8±1.1(37) 31.8±2.4(5) 0.1232
Conscience muscular stomach glandular stomach weight (g) 68.3±0.8(246) 65.9±2.1(37) 69.9±4.6(5) 0.4693
Small intestinal length (cm) 139.1±1.1(248) 135.5±2.7(37) 136.2±6.0(5) 0.482
Abdominal fat (%) 2.198±0.097(248) 1.823±0.244(37) 1.623±0.540(5) 0.329
Leg flesh rate (%) 8.738±0.078(248) 8.332±0.197(37) 8.923±0.436(5) 0.1052
Chest muscle rate (%) 6.862±0.072(248) 6.976±0.181(37) 7.267±0.400(5) 0.6009
Leg chest ratio (%) 1.285±0.011(248) 1.210±0.028(37) 1.255±0.062(5) 0.0548
Above-described embodiment is the preferred embodiment of the present invention, all with similar technique of the invention and made equivalence changes, It should belong to protection category of the invention.

Claims (4)

1. a kind of SNP marker relevant to chicken Carcass Traits, it is characterised in that: the SNP marker corresponds to chicken Mutational site in let-7b prosoma gene order g.526G > A, the genotype of the SNP site is AA, GA and GG.
2. application of the SNP marker described in claim 1 in chicken genetic breeding.
3. the method for breeder growth Meat Traits Seedling selection, which is characterized in that SNP site according to claim 1 Genotype Seedling selection is carried out to the Carcass Traits, Meat Quality and body measurement trait of chicken.
4. the method for breeder Carcass Traits Seedling selection according to claim 3, which is characterized in that including walking as follows It is rapid:
1) chicken blood DNA to be measured is extracted;
2) chicken let-7b prosoma gene order is obtained from chicken blood DNA to be measured;
3) using DNA mix in pond sequencing approach detection chicken let-7b prosoma gene order SNP mutation site g.526G > base of A Because of type;
4) Seedling selection is carried out based on Carcass Traits of the genotype of step 2) SNP site to chicken, wherein AA genotype individuals leg Meat is great in GA and GG genotype individuals.
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CN113789393A (en) * 2021-10-12 2021-12-14 南昌师范学院 Molecular marker related to chicken carcass traits and application thereof
CN113789393B (en) * 2021-10-12 2023-06-16 南昌师范学院 Molecular marker related to chicken carcass traits and application thereof
CN114807384A (en) * 2022-04-14 2022-07-29 华南农业大学 SNP molecular marker related to chicken carcass traits and application thereof
CN114807384B (en) * 2022-04-14 2022-11-25 华南农业大学 SNP molecular marker related to chicken carcass traits and application thereof
CN114717331A (en) * 2022-04-24 2022-07-08 华南农业大学 Poultry SNP molecular marker selection and application thereof
CN114717331B (en) * 2022-04-24 2024-07-02 华南农业大学 Poultry SNP molecular marker selection and application thereof
CN114908176A (en) * 2022-05-18 2022-08-16 华南农业大学 Molecular marker related to chicken carcass and growth traits and application thereof
CN114908176B (en) * 2022-05-18 2022-12-09 华南农业大学 Molecular marker related to chicken carcass and growth traits and application thereof
CN115125308A (en) * 2022-06-07 2022-09-30 华南农业大学 SNP molecular marker for genetically improving chicken carcass traits

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