哈萨克绵羊DRB1基因外显子1和4多态性与布鲁氏菌病的相关性研究

试验旨在对哈萨克绵羊DRB1基因外显子1和4多态性与布鲁氏菌病的相关性进行研究。使用虎红平板凝集试验（RBPT）对试羊的血清进行血清学检测，参考GenBank中绵羊MHC ClassⅡ区DRB1基因序列（登录号：NC_040271.1），对其外显子1和4片段设计引物，采用PCR-SSCP和DNA测序技术对230只哈萨克绵羊的DRB1基因进行多态性检测，分析其多态位点与哈萨克绵羊布鲁氏菌易感性之间的关系。RBPT检测发现66只哈萨克绵羊为布鲁氏菌感染阳性，阳性检出率为28.7%。外显子1片段存在一个SNP位点（F1-G22A），测序确定两种基因型（GG、GA），优势等位基因和基因型分别为G、GG，F1-G22A多态位点的易感基因型为GA。卡方检验表明，哈萨克绵羊DRB1基因F1-G22A多态位点与布鲁氏菌易感性的相关性不显著（P>0.05）。通过生物信息学在线软件分析得出，F1-G22A多态位点导致了RNA二级结构的改变和最小自由能的降低，引起了蛋白质二级结构的改变。DRB1基因外显子4片段未发现SNPs。由此得出，哈萨克绵羊DRB1基因F1-G22A多态位点与布鲁氏菌易感性可能存在一定的相关性。     

哈萨克羊iNOS基因多态性与布鲁氏菌病的相关性分析

试验旨在探讨哈萨克羊诱导型一氧化氮合酶（iNOS）基因多态性与布鲁氏菌病的相关性。使用虎红平板凝集试验（RBPT）方法对231只哈萨克羊血清进行布鲁氏菌病血清学检测,参考GenBank中绵羊iNOS基因序列,针对其第6、7、8外显子及其邻近内含子片段设计引物,利用PCR-SSCP技术和DNA测序技术对231只哈萨克羊的iNOS基因进行多态性检测,分析其SNPs与哈萨克羊布鲁氏菌病易感性的相关性。结果表明,67只哈萨克羊为布鲁氏菌感染阳性,阳性检出率为29.00%。在哈萨克羊iNOS基因的外显子6和8片段上未检测到多态位点,在外显子7片段上检测出F7-T18054C和F7-C18084T 2个多态位点,在F7-T18054C多态位点上检测到3种基因型（TC、TT、CC）,优势等位基因和基因型分别是C型和CT型,其等位基因频率和基因型频率分别是0.660和0.446。在F7-C18084T多态位点上检测到2种基因型（CT、CC）,优势等位基因频率和基因型分别是C和CC型,其等位基因和基因型频率分别是0.946和0.892。F7-C18084T属于低度多态（PIC<0.25）,F7-T18054C属于中度多态（0.25 < PIC < 0.5）。相关性分析表明,F7-T18054C和F7-C18084T多态位点与布鲁氏菌病易感性无显著相关性（P>0.05）。试验结果表明,哈萨克羊iNOS基因F7-T18054C和F7-C18084T多态位点与布鲁氏菌病易感性不存在相关性。     

Polymorphisms and Its Genetic Variation Analysis of DQB2 Gene Exon 2 in Kazakh Sheep

This study was aimed to investigate the association between the polymorphism of DQB2 gene exon 2 and the susceptibility to Kazakh sheep brucellosis. The DQB2 gene exon 2 of Kazakh sheep lymphocyte antigen was amplified by PCR-SSCP method from 146 healthy and 28 infected with Brucella Kazakh sheep, and the single nucleotide polymorphisms (SNP) was analyzed, then the different alleles were selected for cloning and sequencing. In order to analyze its correlation with brucellosis susceptibility, the differences in gene frequency and genotype frequency of each SNP locus were analyzed by Chi-square test. Bioinformatics softwares were used to analyze the secondary structure of mRNA, the secondary structure, tertiary structure and epitope of protein. The sequencing result showed that 33 SNPs were detected in 270 bp DNA sequence, the gene frequencies of C9G and A180G were extremely significantly different in case group and control group (P<0.01), and its genotype frequencies presented significantly difference (P<0.05). Similarly, A13T and C133G loci were significant difference in case group and control group (P<0.05). Further analysis result showed that the minimum free energy of the A180G mutation site was the lowest and its mRNA secondary structure was the most stable; Both A13T and C133G mutation sites caused the changes of mRNA secondary structure, protein secondary, tertiary structure and antigenic epitope of protein, respectively. The results showed that the polymorphism of DQB2 gene exon 2 might be significantly correlated with brucellosis susceptibility in Kazakh sheep.     

哈萨克羊DQB2基因外显子2多态性及遗传变异分析

试验旨在研究DQB2基因外显子2多态性与哈萨克羊布鲁氏菌病易感性的相关性。通过PCR-SSCP技术对146只布鲁氏菌阴性哈萨克羊血液样本和28只布鲁氏菌阳性哈萨克羊血液样本中的白细胞表面抗原DQB2基因外显子2的多态性进行研究,挑取不同的等位基因进行克隆测序,经卡方检验分析每个SNP位点的基因频率、基因型频率及其多态性与布鲁氏菌病易感性的相关性,应用生物信息学软件分析与哈萨克羊布鲁氏菌病易感性相关的不同等位基因的mRNA二级结构及蛋白质的二级结构、三级结构和抗原表位。结果发现,在270 bp的外显子2序列中共检测到33个SNPs,其中C9G、A180G位点的基因频率在病例组和对照组中的分布具有极显著性差异（P<0.01）,其基因型频率在病例组和对照组中存在显著差异（P<0.05）;A13T、C133G位点的基因频率在病例组和对照组中存在显著差异（P<0.05）;进一步分析发现,A180G突变位点的最小自由能最低,其mRNA二级结构最稳定;A13T和C133G 2个突变位点均引起mRNA二级结构及蛋白质二级结构、三级结构和抗原表位的改变。本试验结果表明DQB2基因外显子2多态性与哈萨克羊布鲁氏菌病易感性呈显著相关。     

哈萨克羊DRB1基因外显子3多态性及生物信息学分析

试验旨在研究白细胞表面抗原DRB1基因外显子3多态性与哈萨克羊布鲁氏菌病易感性的相关性。运用混合DNA池结合PCR产物直接测序方法,对哈萨克羊DRB1基因外显子3进行多态性分析,经卡方检验分析每个SNP位点的等位基因频率、基因型频率及其多态性与布鲁氏菌病易感性的相关性,利用生物信息学分析软件对PCR扩增所获序列进行RNA二级结构及蛋白质的二级结构和抗原表位分析。结果表明,在282 bp的外显子3序列中共检测到7个SNPs,分别为：T10C、C119T（Trp→Arg）、G215C（Gln→Glu）、A238G、T245G（Ser→Ala）、G256A、C259T,这些位点在病例组和对照组之间的等位基因频率及各基因型间不存在显著性差异（P > 0.05）;进一步分析发现,各突变位点均引起RNA二级结构和最小自由能的改变,各错义突变位点均未引起蛋白质二级结构和抗原表位的改变。由此得出,DRB1基因外显子3的7个SNPs位点（T10C、C119T、G215C、A238G、T245G、G256A和C259T）与哈萨克羊布鲁氏菌病易感性无相关性。     

利用单碱基编辑系统定点编辑哈萨克羊MSTN基因的研究

肌肉生长抑制素（myostatin,MSTN）可负调控骨骼肌的发育。本研究利用胞嘧啶碱基编辑器（cytidine base editor,CBE）在哈萨克羊MSTN基因编码区提前引入终止密码子,以期达到敲除MSTN基因的目的。共设计2条靶向哈萨克羊MSTN基因不同外显子的sgRNAs,分别连接至pGL3-U6-sgRNA-PGK-puromycin质粒,并与pCMV-AncBE4 max-P2A-GFP质粒共转染哈萨克羊胎儿成纤维细胞,经Cruiser^TM酶酶切检测、Sanger测序和TA克隆分析。结果显示,成功筛选出可以在哈萨克羊MSTN基因外显子提前引入终止密码子的2条sgRNAs,其中STOPsg-1靶位点编辑效率为26.7%,STOPsg-2靶位点的编辑效率为6.7%。本研究成功运用CBE（AncBE4 max）技术在哈萨克羊胎儿成纤维细胞MSTN基因编码区实现定点编辑,为培育精确编辑MSTN基因的哈萨克羊奠定基础。     

The Polymorphisms of Chinese Merino Sheep eNOS Gene exon8 and its Association with Brucellosis Susceptibility

The association of Chinese Merino sheep eNOS gene exon8 polymorphisms with brucellosis susceptibility was studied in this research.The sequences of human and Chinese Merino sheep eNOS gene exon8 were aligned by the bioinformatics methods,and the polymorphisms of human eNOS gene in the NCBI SNP database were statistically analyzed.The polymorphisms of 101 Chinese Merino sheep negative samples and 61 Chinese Merino sheep positive samples were detected by PCR-SSCP method,and then the PCR products of different alleles were sequenced,aiming to determine exon8's polymorphism loci,and the allele frequency and genotype frequency of SNP loci were statistically analyzed.A novel SNP locus (ss974768653:A142G) was detected at the 142 bp of eNOS gene exon8,and the locus had no difference in allele frequency and each genotype between negative and positive groups (P >0.05).There might be no correlation between the A142G polymorphism locus of Chinese Merino sheep eNOS gene exon8 and brucellosis susceptibility.     

中国美利奴羊eNOS基因exon8多态性及其与布鲁氏菌病易感性相关性分析

本试验旨在研究内皮型一氧化氮合酶(eNOS)基因exon8多态性与中国美利奴羊布鲁氏菌病易感性的相关性。利用生物信息学方法对人和中国美利奴羊eNOS基因exon8序列进行比对,并对NCBI SNP数据库上人eNOS基因exon8多态性进行了统计分析。通过PCR-SSCP对101只中国美利奴羊阴性样本和61只中国美利奴羊阳性样本eNOS基因exon8的多态性进行检测,然后对不同等位基因进行PCR产物测序,旨在确定该基因exon8多态性位点,并对SNP位点的等位基因频率、基因型频率进行统计分析。在eNOS基因exon8序列142 bp处检测到一个新的SNP位点(ss974768653:A142G),该位点在病例组和对照组之间的等位基因频率及各基因型间不存在显著差异性(P >0.05)。eNOS基因exon8 A142G多态性位点与中国美利奴羊布鲁氏菌病易感性可能无相关性。     

松辽黑猪OAS1基因多态性及其与繁殖性状的关联分析

为探究寡腺苷酸合成酶1（oligoadenylate synthase 1,OAS1）基因多态性与松辽黑猪繁殖性状的关联性,试验选取130头松辽黑猪母猪为研究对象,利用Sanger直接测序法测序查找OAS1基因外显子1~8的SNP位点,使用SPSS 19.0软件分析OAS1基因SNP位点与松辽黑猪繁殖性状的关联性。结果显示,在松辽黑猪OAS1基因外显子2、3和6上共检测到33个突变位点;其中在外显子2的110 bp处存在1个SNP位点（G110C）,存在3种基因型：GG、GC和CC;在外显子3的176 bp处存在1个SNP位点（C176T）,存在3种基因型：CC、CT和TT;在外显子6的145 bp处存在1个SNP位点（C145T）,存在3种基因型：CC、CA和AA;在166 bp处存在1个SNP位点（G166A）,存在3种基因型：GG、GA和AA;在206 bp处存在1个SNP位点（A206G）,存在3种基因型：AA、AG和GG。卡方适合性检验结果显示,松辽黑猪OAS1基因G110C突变位点符合Hardy-Weinberg平衡状态,C176T、C145A、G166A和G206A位点均偏离Hardy-Weinberg平衡状态。群体遗传参数分析结果显示,各SNPs位点遗传杂合度均位于中等水平,为中度多态（0.25<PIC<0.5）。关联分析结果发现,G110C位点GC基因型个体总产仔数、产活仔数和断奶仔猪数均显著高于GG基因型个体（P<0.05）;C176T位点CT基因型个体断奶仔猪数显著高于CC基因型个体（P<0.05）;C145T位点CC基因型个体总产仔数和产活仔数均显著高于AA基因型个体（P<0.05）;G166A位点GA基因型个体断奶仔猪数显著高于GG基因型个体（P<0.05）;A206G位点GG基因型个体总产仔数和产活仔数显著高于AA基因型个体（P<0.05）。结果表明,OAS1基因外显子区存在突变位点,对松辽黑猪部分繁殖性状有显著性影响。     

Polymorphism Study on DRB3 Gene Exon 2 in Tianzhu White Yak and Gannan Yak Arlud

In this study,CDS sequence of DRB3 gene exon 2 in Tianzhu White yak and Gannan yak were analyzed,a clean single chain was obtained to get the accurate haplotype by direct sequencing and amplification refractory mutation system (ARMS) method,the double chain of high heterozygosity was typed.The results showed that 65 SNPs and a codon insertion and deletion were discovered,all together separated to 30 haplotypes,in which seven haplotypes were found firstly,it should be peculiar to Tianzhu White yak and Gannan yak.Compared with published bovine DRB3 gene exon 2 haplotypes,the analysis results showed Tianzhu White yak and Gannan yak shared haplotypes of cattle (Bos taurus) and zebu (Bos indicus),which meaned they might crossed with cattle (Bos taurus) and zebu (Bos indicus).PAML analysis showed that 4,25,30,53,59,62,63,66,78 amino acid sites were affected by positive selection,and mainly occurred in Tianzhu yak,it had a certain relation with breeding history of Tianzhu White yak.     

The Correlation Analysis between Chinese Merino Sheep OLA-DQB1 Gene Exon 2 Genetic Polymorphism and Brucellosis Susceptibility

The single nucleotide polymorphisms (SNPs) of ovine lymphocyte antigen DQB1 (OLA-DQB1) gene exon 2 was amplified by PCR-SSCP method from 148 healthy and 60 infected with Brucella Chinese Merino sheep and then PCR products of different alleles were sequenced to determine the polymorphism loci of the gene.The differences in gene frequency and genotype frequency of each SNP loci were analyzed statistically to analyze its correlation with brucellosis susceptibility.The sequencing result showed that 43 SNPs were detected in 270 bp DNA sequence,the gene frequencies of G196A allele had extremely significant difference in case and control samples (P< 0.01),and its genotype frequencies presented significant difference (P< 0.05).Similarly,C211T allele was significantly different in case and control samples (P< 0.05).The results showed that the polymorphism of OLA-DQB1 gene exon 2 might be a significant association gene with brucellosis susceptibility.     

天祝白牦牛和甘南牦牛DRB3基因外显子2多态性研究

试验通过对天祝白牦牛和甘南牦牛DRB3基因外显子2部分CDS序列进行分析,获得其准确单倍型,通过直接测序与聚合酶链式扩增阻碍突变系统(ARMS)扩增法获得干净的单链,对高度杂合的双链进行分型。结果发现65个SNPs,1个密码子的插入缺失,获得30个单倍型,其中有7个单倍型是首次发现,应该是天祝白牦牛和甘南牦牛特有的单倍型。通过对已知牛属所有DRB3基因外显子2单倍型与本研究发现的单倍型进行分析发现天祝白牦牛和甘南牦牛分享普通牛和瘤牛单倍型,可能有普通黄牛和瘤牛的遗传背景,且DRB3基因外显子2的4、25、30、53、59、62、63、66、78氨基酸位点受到了正选择的影响,主要发生在天祝白牦牛群体里,这与天祝白牦牛长期选育白毛有一定的关系。     

中国美利奴羊OLA-DQB1基因exon2遗传多态性与布鲁氏菌病易感性的关联分析

本试验采用PCR-SSCP方法对148只布鲁氏菌阴性和60只布鲁氏菌阳性中国美利奴羊白细胞表面抗原DQB1(OLA-DQB1)基因exon 2单核苷酸多态性(SNPs)进行了检测,之后挑选不同等位基因进行PCR产物测序,旨在确定该基因的多态性位点,并对每个SNP位点的等位基因频率、基因型频率进行统计分析,从而分析其多态性与布鲁氏菌病易感性的相关性.测序结果表明,在270 bp的序列内共检测到43个SNPs,其中G196A位点的等位基因频率在病例组和对照组中的分布存在极显著差异(P< 0.01),其基因型频率存在显著差异(P< 0.05);C211T位点的等位基因频率在病例组和对照组中存在显著差异(P< 0.05).由此表明,OLA-DQB1基因exon 2多态性与中国美利奴羊布鲁氏菌病易感性呈显著相关.     

马可·波罗盘羊和5种家养绵羊MHC-DRB3基因第2外显子遗传多态性分析

【目的】 分析马可·波罗盘羊MHC-DRB3基因第2外显子多态性，确定其等位基因数及核苷酸、氨基酸多态位点，以及与家养绵羊的遗传进化关系。【方法】 采用PCR-SSCP方法对39只马可·波罗盘羊、159只塔什库尔干羊、72只藏绵羊、76只宁夏滩羊、36只柯尔克孜羊和26只多浪羊MHC-DRB3基因第2外显子的等位基因进行检测，对不同绵羊品种产生的差异等位基因进行克隆及测序，并对等位基因单倍型序列进行分析；利用生物信息学在线软件分析马可·波罗盘羊MHC-DRB3基因第2外显子编码蛋白的理化性质、结构和功能。【结果】 试验共获得66个MHC-DRB3等位基因，马可·波罗盘羊、塔什库尔干羊、藏绵羊、宁夏滩羊、柯尔克孜羊和多浪羊的等位基因数分别为23、14、12、12、4和1个。马可·波罗盘羊、塔什库尔干羊、藏绵羊、宁夏滩羊和柯尔克孜羊MHC-DRB3基因第2外显子等位基因序列中的核苷酸多态位点分别为74、76、45、49和25个，表明相较于藏绵羊、宁夏滩羊和柯尔克孜羊，马可·波罗盘羊和塔什库尔干羊的多态性更高。系统发育分析表明，马可·波罗盘羊和塔什库尔干羊MHC-DRB3基因均呈两支分化；马可·波罗盘羊、塔什库尔干羊和藏绵羊MHC-DRB3基因单倍型的相似性较高。马可·波罗盘羊MHC-DRB3基因第2外显子编码产物为不稳定亲水性蛋白，二级结构主要以无规则卷曲和α-螺旋为主，其生物学作用主要在细胞质中体现。【结论】 本试验确定了马可·波罗盘羊和5种家养绵羊MHC-DRB3基因第2外显子的等位基因数及核苷酸、氨基酸多态位点，为进一步探究绵羊MHC-DRB3基因的调控机理及进化意义提供材料。     

乌珠穆沁羊生长分化因子11基因外显子1序列CpG位点的甲基化模式分析

为了探讨乌珠穆沁羊生长分化因子11 (growth differentiation factor 11,GDF11)基因外显子1的甲基化模式,本研究采用亚硫酸氢盐测序PCR (BSP)的方法对普通乌珠穆沁羊和多脊椎乌珠穆沁羊GDF11基因外显子1的甲基化水平进行检测,通过检测发现普通乌珠穆沁羊GDF11基因外显子1的平均甲基化率为0.123,多脊椎乌珠穆沁羊的平均甲基化率为0.569,差异显著性检验表明这两组数据间差异极显著(P<0.01),即多脊椎乌珠穆沁羊GDF11基因外显子1中的CpG甲基化率极显著高于普通乌珠穆沁羊(P<0.01).通过分析GDF11基因外显子1的13个CpGs位点发现,多脊椎乌珠穆沁羊CpG_11和CpG_13位点的甲基化率值最高,达到90%,推测这两个位点的甲基化可能与乌珠穆沁羊的脊椎数增加有关,是导致多脊椎发生的主要原因.     

Analysis of the CpG Methylation Pattern on GDF11 Gene Exon 1 in Ujumqin Sheep

In order to investigate the methylation patterns on growth differentiation factor 11 (GDF11) gene exon 1 in Ujumqin sheep,we compared the level of methylation of GDF11 gene exon 1 in common Ujumqin sheep (CUS) and multi-vertebrae Ujumqin sheep (MUS) using the bisulfite sequencing PCR (BSP) method.The results showed that the average methylation rate of GDF11 gene exon 1 for MUS was extremely significantly higher than that for CUS (P<0.01),the average methylation rate of common Ujumqin sheep and multi-vertebrae Ujumqin sheep were 0.123 and 0.569.Analysis of 13 CpGs of GDF11 gene exon 1 showed that the CpG_11 and CpG_13 methylation sites had the highest methylation rate with a combined methylation value of 90% for MUS.Our results suggested that differential DNA methylation of GDF11 gene exon 1,in particular at these two sites,might cause the increase in the number of vertebrae in Ujumqin sheep.     

梅山猪Mx1基因第14外显子多态性及其与繁殖性能的关联分析

为了探讨梅山猪Mx1基因第14外显子的多态性及其对梅山猪繁殖性能的影响,本研究采用PCR-RFLP方法对所采个体Mx1基因第14外显子进行DNA扩增并检测其多态性,同时利用广义线性模型(GLM)分析不同基因型与繁殖性能间的关系。PCR-RFLP结果表明,梅山猪Mx1基因第14外显子Hin6Ⅰ酶切位点存在G36T突变,共检测到2种等位基因,分别定义为:A、B,其中B基因为优势等位基因;共检测到3种基因型,分别定义为:AA、AB、BB,其中BB基因型为优势基因型;关联分析结果表明,在初产母猪中,总产仔数(TNB)、产活仔数(NBA)、断奶仔猪数(LBW)、初生重(BW)及断奶重(WW)这5个繁殖性状在Mx1基因的3种基因型中的差异均存在BB >AB >AA的趋势,BB基因型为有利基因型;且在总产仔数、产活仔数、断奶仔猪数和断奶重中表现出显著差异性(P<0.05);但在经产母猪中均没有显著差异(P>0.05)。本研究结果提示,Mx1基因第14外显子多态性对梅山猪初产母猪的繁殖性能有显著的遗传效应,而对经产母猪的繁殖性能没有显著的影响。     

Polymorphism of Mx1 Gene Exon 14 and its Relationship with Reproductive Performance in Meishan Pigs

To analyze the effect of different genotypes in Mx1 gene exon 14 on the reproductive performance in Meishan pigs,PCR-RFLP method was used to amplify DNA and detect the polymorphisms of Mx1 gene exon 14, and the relationship between different genotypes and the reproductive performance was further analyzed by generalized linear model (GLM) in this study.The results of PCR-RFLP showed that there was a G36T mutation on Hin6 Ⅰ restriction site in Mx1 gene exon 14 and three genotypes were detected named as AA,AB and BB,in which BB was a dominant genotype.The results of correlation analysis showed that the reproductive performance of three genotypes in Mx1 gene presented the increasing tendency of BB >AB >AA in total number born (TNB),number born alive (NBA),little size at weaning (LBW),birth weight (BW) and weaning weight (WW) in gilts sows on the whole.Moreover,there was significant difference in TNB,NBA,LBW and WW in gilts sows (P< 0.05).However,there was no significant difference among all reproductive performance in multiparous sows (P >0.05).The results of this study indicated that the polymorphisms of Mx1 gene exon 14 had significantly genetic effects on production performance in Meishan gilts sows instead of multiparous sows.     

藏羊BMPRⅡ基因多态性及其单倍型与产羔性状相关分析

【目的】研究骨形态发生蛋白受体Ⅱ(bone morphogenetic protein receptorⅡ,BMPRⅡ)基因多态性及其单倍型与藏羊产羔性状的相关性。【方法】以433只藏羊母羊为研究对象,采用改良多重高温连接酶检测反应技术(improved multiple ligase detection reaction, iMLDR)对BMPRⅡ基因9个单核苷酸多态性(single nucleotide polymorphism, SNP)位点在藏羊群体中的多态性进行检测,使用Haploview 4.2软件分析其连锁不平衡性并构建单倍型,应用基因关联分析探究BMPRⅡ基因多态性及单倍型与藏羊产羔性状的关联。【结果】藏羊BMPRⅡ基因外显子12中存在6个SNPs,分别为:g.90192 T>C、g.142532 C>T、g.142614 A>G、g.142751 T>C、g.143138 A>G和g.143189 G>A,外显子3、9和13中各存在1个SNP,分别为:g.143570 C>G、g.124843 A>C和g.145233 ...     

Different Months of MSTN Gene mRNA Expression Levels and their Correlation with Growth Traits in Five Xinjiang Local Sheep

To explore the different varieties of five Xinjiang local sheep myostatin (MSTN) expression levels and their correlation with growth traits (body weight,body height,body length,heart girth and cannon circumference).The MSTN mRNA expression level in different month(Birth,1 months,2 months,3 months,4 months,5 months) of muscle and fat in Altay sheep,Turpan Black sheep,Emil White sheep,Kazakh sheep,Bashbay sheep by quantitative Real-time PCR method,using SPSS 19.0 software to analyze the correlation with growth traits.The MSTN mRNA expression levels in muscle:The MSTN gene mRNA expression levels of Altay sheep,Kazakh sheep and Bashbay sheep at birth were lower than other months;The MSTN gene mRNA expression level of Emil White sheep in 3 months was significantly lower than other months (P<0.05);The MSTN gene mRNA expression levels of Altay sheep,Turpan Black sheep were the highest in 4 months;The MSTN gene mRNA expression level of Kazakh sheep was the lowest at birth,and was the highest in 5 months.The MSTN gene mRNA expression levels in fat:The MSTN gene mRNA expression level of Emil White sheep at birth was significantly lower than other months (P<0.05); The MSTN gene mRNA expression levels of Altay sheep,Emil White sheep and Bashbay sheep were the highest in 5 months,the MSTN gene mRNA expression level of Bashbay sheep in 5 months was significantly higher than other months (P<0.05);The MSTN gene mRNA expression level of Kazakh sheep was the highest in 2 month,it was significantly higher than 5 months (P<0.05).Correlation analysis revealed that the MSTN gene mRNA expression levels were mostly negatively correlated with growth traits.The MSTN gene mRNA expression levels in muscle and fat of Altay sheep were all negatively correlated with growth traits;The MSTN gene mRNA expression levels in muscle of Turpan Black sheep were negative correlated with body length and body height,others were positively;The MSTN gene mRNA expression levels in muscle of Emil White sheep were positive correlated with heart girth and cannon circumference;The MSTN gene mRNA expression levels in fat were positive correlated with body length,others were negatively correlation;The MSTN gene mRNA expression levels in muscle and fat of Kazakh sheep were positive correlated with body length,others were negatively correlation;The MSTN gene mRNA expression levels in muscle of Bashbay sheep were positive correlated with body length and cannon circumference,others were negatively correlation.The MSTN gene mRNA expression level was discrepancy in different month of different varieties,and was no fixed expression pattern;The MSTN gene mRNA expression levels were positively correlated with the part of the body size.The MSTN gene mRNA expression levels might have a direct relationship with the growth traits and bone growth.