Detection and Analysis of RXFP2 Gene SNPs Related to Horn Trait of Oula Sheep
Qianglong ZHANG, Sen WU, Cairang DUOJIE, Yanhua TANG, Jie MA
Detection and Analysis of RXFP2 Gene SNPs Related to Horn Trait of Oula Sheep
The aim of this study was to analyze the regulatory effect of RXFP2 gene on horned phenotype and related SNP markers in horned and hornless Oula sheep populations,in order to provide technical support for genetic improvement and breed breeding of Oula sheep.DNA was extracted from 100 ewe blood samples of healthy adult Oula sheep in Henan County,Qinghai Province,including 50 blood samples with horns and 50 blood samples without horns,respectively,15 samples with and without horns were randomly selected for whole genome sequencing,and then all blood samples were amplified by multiple PCR to verify the SNPs of RXFP2 gene.Genome-wide detection results showed that there were strong selection signals in chromosome 10 of Oula sheep,including RXFP2 gene,and the strongest selection signals appeared in the RXFP2 gene segment.Multiple PCR tests verified the accuracy of the 4 coding SNPs screened by whole genome resequencing.Seven high frequency SNPs in the intron region of RXFP2 gene were detected in Oula sheep(29508704G>A,29509428A>C,29509766G>A,29512170G>A,2951276G>A,29514968T>A,29521377C>A).The genotypes of the 7 SNP loci were separated in hornless phenotypes.100% of homozygous genotypes appeared horned or hornless trait,89.66% of heterozygous genotypes were hornless trait and 10.34% were horned trait.The frequency of mutant alleles was less than that of wild alleles,and the population showed an unbalanced state of Hardy-Weinberg,which meant subject to high artificial selection intensity,but the content of polymorphic information was moderate,and the potential of breeding and improvement was still large.In conclusion,the present study confirmed the strong regulatory effect of RXFP2 gene on horn trait in Oula sheep,and filtered out 7 molecular markers of RXFP2 gene on horn trait in Oula sheep population.The relevant results can be used as molecular markers for genetic improvement of the hornless population of Oula sheep.
Oula sheep / RXFP2 gene / SNPs polymorphic site / Horn trait / Molecular marker {{custom_keyword}} /
Tab.1 Primer information of 18 exons of RXFP2 gene表1 RXFP2基因18个外显子引物信息 |
位点 Location | 引物序列(5'—3') Primer sequences(5'—3') | 长度/bp Length | 退火温度/℃ Tm |
---|---|---|---|
Exon1 | F:GGGACTGCAGCTAGTTCACTTT | 751 | 60.3 |
R:GGCACTTCTATCCATGGCTCTAT | |||
Exon2 | F:CATGCACAAGTAGGACAATCACT | 743 | 64.5 |
R:CAGAAGGAAGTGGTCATCGTTTA | |||
Exon3 | F:GCTTTTCCTTCCTTACCATTGTC | 597 | 58.0 |
R:TCTAGTGGAGCCATGTGAGGTAT | |||
Exon4 | F:GCCTTTCTGTGCCATTCAATTA | 697 | 64.5 |
R:AACCTGGACAATCCAACATACAG | |||
Exon5 | F:AAATCACCGTAGATGTTCCAGTC | 667 | 60.3 |
R:ACCACTCTTCCAGGTTAAAAAGC | |||
Exon6 | F:ACTTTGGTGGGTTCAAGTCAGAG | 659 | 58.0 |
R:TTGCAGCAGGATTCTTTACTACTG | |||
Exon7 | F:CCCCAGTGCATTATTTCTGG | 738 | 64.5 |
R:TGGGGTAGAGACCACAAAGG | |||
Exon8 | F:GAGCCCATAATCAGCCAATAAA | 842 | 58.0 |
R:CTAGAATTTTCAGTGACTCTTGCTG | |||
Exon9 | F:GGCTGTATGATGCTGGTAATGA | 811 | 64.5 |
R:GATAAGAATCCTCCAGCCAATG | |||
Exon10 | F:CCATGTCTAAGTGTCAGGCAGA | 871 | 64.5 |
R:GCAGCAACACTAACCACTTTCA | |||
Exon11 | F:CTTTGCTCTTTCTGGCCTTCT | 804 | 60.1 |
R:CATTCAGCAAACTTCAACTGAG | |||
Exon12-13 | F:CCTAAAACAGAGGAAACGAATG | 835 | 60.1 |
R:TTGTGAGAACCGTAAGATGAGA | |||
Exon14 | F:TCAAGCTACAGAGCCAATTTCA | 765 | 62.0 |
R:CATCTTTCTTCCTAAGGGCTCA | |||
Exon15 | F:TATAACACCCCCAGAGAACCAC | 825 | 65.8 |
R:TAATTTTCTGGGCTTGAGGAAC | |||
Exon16 | F:TGTGGGTGTTTTCATTAGTTCG | 851 | 64.5 |
R:AACTTGGAAGGGTCACAGGAC | |||
Exon17 | F:TATCTTTTTGATCTGGCGAACC | 842 | 65.4 |
R:ACATGGGTTTGATTTCTGGTCT | |||
Exon18 | F:TGACTCCAAACCAGAAGATTCC | 962 | 64.5 |
R:TGCTGCAGAGATAGAGATCCAC |
Tab.2 Selection analysis of hornless and horned Oula sheep by Tajima's D表2 无角、有角欧拉羊群体Tajima's D选择分析结果(Top 10) |
群体 Group | 染色体 Chromosome | 起始位点 Start site | SNP数量 SNP number | Tajima's D检验 Tajima's D test |
---|---|---|---|---|
无角型欧拉羊 | NC_019477.2 | 50280000 | 160 | 3.960 54 |
The hornless Oula sheep | NC_019484.2 | 66800000 | 226 | 3.957 48 |
NC_019463.2 | 90200000 | 111 | 3.932 68 | |
NC_019467.2 | 42100000 | 110 | 3.929 81 | |
NC_019460.2 | 130080000 | 194 | 3.920 43 | |
NC_019484.2 | 66940000 | 111 | 3.905 65 | |
NC_019484.2 | 66960000 | 103 | 3.903 45 | |
NC_019484.2 | 67060000 | 62 | 3.896 94 | |
NC_019471.2 | 14220000 | 126 | 3.887 90 | |
NC_019474.2 | 58000000 | 242 | 3.874 20 | |
有角型欧拉羊 | NC_019467.2 | 32440000 | 142 | 3.952 12 |
The horn Oula sheep | NC_019458.2 | 109560000 | 152 | 3.934 47 |
NC_019484.2 | 76280000 | 98 | 3.928 91 | |
NC_019484.2 | 84160000 | 167 | 3.920 42 | |
NC_019467.2 | 41860000 | 82 | 3.919 64 | |
NC_019458.2 | 199560000 | 187 | 3.905 77 | |
NC_019467.2 | 41840000 | 97 | 3.896 65 | |
NC_019458.2 | 109580000 | 183 | 3.894 97 | |
NC_019467.2 | 41700000 | 171 | 3.887 07 |
Tab.3 π selection results of horned and hornless Oula sheep by π表3 有角、无角欧拉羊群体π选择分析结果(Top 10) |
群体 Group | 染色体 Chromosome | 起始位点 Start site | 终止位点 End site | SNP数量 SNP number | π值 π value |
---|---|---|---|---|---|
无角型欧拉羊 | NC_019464.2 | 22640001 | 22680000 | 1 281 | 0.002 218 53 |
The hornless Oula sheep | NC_019475.2 | 57520001 | 57560000 | 1 006 | 0.002 367 82 |
NC_019464.2 | 22620001 | 22660000 | 972 | 0.002 187 53 | |
NC_019464.2 | 22660001 | 22700000 | 989 | 0.001 798 51 | |
NC_019460.2 | 205440001 | 205480000 | 927 | 0.001 593 17 | |
NC_019460.2 | 206780001 | 206820000 | 900 | 0.001 169 72 | |
NC_019458.2 | 96920001 | 96960000 | 836 | 0.001 220 93 | |
NC_019470.2 | 36880001 | 36920000 | 749 | 0.001 442 71 | |
NC_019464.2 | 22560001 | 22600000 | 867 | 0.001 033 39 | |
NC_019460.2 | 205420001 | 205460000 | 837 | 0.001 196 61 | |
有角型欧拉羊 | NC_019464.2 | 22640001 | 22680000 | 1 286 | 0.011 804 10 |
The horn Oula sheep | NC_019475.2 | 57520001 | 57560000 | 1 003 | 0.009 558 05 |
NC_019464.2 | 22660001 | 22700000 | 1 000 | 0.008 712 36 | |
NC_019464.2 | 22620001 | 22660000 | 966 | 0.008 669 54 | |
NC_019460.2 | 205440001 | 205480000 | 929 | 0.008 469 74 | |
NC_019458.2 | 96920001 | 96960000 | 828 | 0.007 802 66 | |
NC_019460.2 | 205420001 | 205460000 | 835 | 0.007 780 87 | |
NC_019460.2 | 206780001 | 206820000 | 896 | 0.007 728 59 | |
NC_019472.2 | 45640001 | 45680000 | 898 | 0.007 637 26 | |
NC_019470.2 | 36880001 | 36920000 | 726 | 0.007 569 19 |
Tab.4 Fst selection analysis of horned and hornless Oula sheep by Fst表4 有角、无角欧拉羊群体Fst选择分析结果 |
染色体 Chromosome | 起始位点 Start site | 终止位点 End site | SNP数量 SNP number | Fst权重值 Fst weighted | Fst 均值 Fst Mean |
---|---|---|---|---|---|
NC_019467.2 | 29420001 | 29460000 | 185 | 0.555 574 | 0.450 275 |
NC_019467.2 | 29440001 | 29480000 | 184 | 0.543 529 | 0.377 100 |
NC_019467.2 | 29340001 | 29380000 | 346 | 0.534 190 | 0.328 112 |
NC_019467.2 | 29400001 | 29440000 | 238 | 0.532 660 | 0.401 596 |
NC_019467.2 | 29360001 | 29400000 | 270 | 0.469 524 | 0.283 048 |
NC_019467.2 | 29380001 | 29420000 | 299 | 0.466 929 | 0.272 309 |
NC_019467.2 | 29320001 | 29360000 | 324 | 0.458 475 | 0.255 278 |
NC_019467.2 | 29460001 | 29500000 | 152 | 0.380 597 | 0.244 133 |
NC_019467.2 | 25440001 | 25480000 | 236 | 0.356 358 | 0.227 202 |
NC_019469.2 | 300001 | 340000 | 303 | 0.336 557 | 0.209 993 |
Tab.5 The SNPs information of RXFP2 intron position表5 RXFP2基因非编码区部分内含子位置SNP |
基因 Gene | 内含子位置 Intron | 突变位置 Variation site | 突变碱基 Alternate | 突变数量 Mutation number | 无角(46) Hornless number | 有角(48) Horned number |
---|---|---|---|---|---|---|
RXFP2 | Intro17 | 29501199 | C>T | 1 | 0 | 1 |
RXFP2 | Intro17 | 29501256 | G>A | 1 | 1 | 0 |
RXFP2 | Intro17 | 29501270 | A>T | 1 | 0 | 1 |
RXFP2 | Intro16 | 29508704 | G>A | 74 | 26 | 48 |
RXFP2 | Intro16 | 29509428 | A>C | 74 | 26 | 48 |
RXFP2 | Intro14 | 29509766 | G>A | 74 | 26 | 48 |
RXFP2 | Intro13 | 29512170 | G>A | 74 | 26 | 48 |
RXFP2 | Intro13 | 29512176 | G>A | 74 | 26 | 48 |
RXFP2 | Intro12 | 29514968 | T>A | 74 | 26 | 48 |
RXFP2 | Intro10 | 29521377 | C>A | 74 | 26 | 48 |
Tab.6 The SNPs genotype and its association with the phenotype information of RXFP2 intron表6 RXFP2基因非编码区内含子SNPs基因型及与表型关联信息 |
突变位点 Mutation site | 个体数 Number | 基因型(频率/%) Genotype (frequency) | 表型(频率/%) Phenotype(frequency) | 等位基因(频率/%) Alleles (frequency) |
---|---|---|---|---|
29508704G>A | 20 | GG(21.28) | 无角(100) | G(36.70) |
29 | GA(30.85) | 无/有角(89.66/10.34) | A(63.30) | |
45 | AA(47.87) | 有角(100) | ||
29509428A>C | 20 | AA(21.28) | 无角(100) | A(36.70) |
29 | AC(30.85) | 无/有角(89.66/10.34) | G(63.30) | |
45 | CC(47.87) | 有角(100) | ||
29509766G>A | 20 | GG(21.28) | 无角(100) | G(36.70) |
29 | GA(30.85) | 无/有角(89.66/10.34) | A(63.30) | |
45 | AA(47.87) | 有角(100) | ||
29512170G>A | 20 | GG(21.28) | 无角(100) | G(36.70) |
29 | GA(30.85) | 无/有角(89.66/10.34) | A(63.30) | |
45 | AA(47.87) | 有角(100) | ||
29512176G>A | 20 | GG(21.28) | 无角(100) | G(36.70) |
29 | GA(30.85) | 无/有角(89.66/10.34) | A(63.30) | |
45 | AA(47.87) | 有角(100) | ||
29514968T>A | 20 | TT(21.28) | 无角(100) | T(36.70) |
29 | TA(30.85) | 无/有角(89.66/10.34) | A(63.30) | |
45 | AA(47.87) | 有角(100) | ||
29521377C>A | 20 | CC(21.28) | 无角(100) | G(36.70) |
29 | CA(30.85) | 无/有角(89.66/10.34) | A(63.30) | |
45 | AA(47.87) | 有角(100) |
Tab.7 The SNPs polymorphism information of RXFP2 intron表7 RXFP2基因非编码区内含子SNPs多态信息 |
突变位点 Mutation site | 个体数 Number | 基因型 Genotype | 理论个体数 Theoretical number | 卡方值 Chi-square value | P值 P value | 多态信息 含量PIC | 观测 杂合度Ho | 期望杂合 度He | 有效等位 基因数Ne |
---|---|---|---|---|---|---|---|---|---|
29508704G>A | 20 | GG | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | GA | 43.68 | |||||||
45 | AA | 37.66 | |||||||
29509428A>C | 20 | AA | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | AC | 43.68 | |||||||
45 | CC | 37.66 | |||||||
29509766G>A | 20 | GG | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | GA | 43.68 | |||||||
45 | AA | 37.66 | |||||||
29512170G>A | 20 | GG | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | GA | 43.68 | |||||||
45 | AA | 37.66 | |||||||
29512176G>A | 20 | GG | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | GA | 43.68 | |||||||
45 | AA | 37.66 | |||||||
29514968T>A | 20 | TT | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | TA | 43.68 | |||||||
45 | AA | 37.66 | |||||||
29521377C>A | 20 | CC | 12.66 | 10.61 | 0.00 | 0.36 | 0.31 | 0.46 | 1.87 |
29 | CA | 43.68 | |||||||
45 | AA | 37.66 |
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