【摘要】 文章旨在探究绵羊FSTL3基因g.40674542C>T位点多态性与绵羊产羔数之间的关系,以期为绵羊高繁殖力分子育种提供新的遗传标记。利用全基因组重测序结合Sequenom MassARRAY~SNP技术对常年发情绵羊品种(小尾寒羊、策勒黑羊和湖羊)和季节性发情绵羊品种(滩羊、苏尼特羊和草原型藏羊)FSTL3基因g.40674542C>T位点多态性进行了检测,并与小尾寒羊产羔数进行了关联分析。结果表明:FSTL3基因g.40674542C>T位点存在CC、TC和TT三种基因型,基因型频率和等位基因频率在两种发情模式绵羊品种间差异均不显著(P>0.05);g.40674542C>T位点在6个绵羊品种中均表现为低度多态(PIC<0.25),经卡方适合性检验,该位点在小尾寒羊、湖羊和草原型藏羊中处于哈代温伯格平衡状态(P>0.05),在其余3个绵羊品种中处于哈代温伯格不平衡状态;g.40674542C>T位点不同基因型与小尾寒羊第一、第二以及第三胎产羔数均无显著关联(P>0.05)。说明FSTL3基因g.40674542C>T位点不适合用于小尾寒羊产羔数选育。更多还原

【Abstract】 To elucidate the association between FSTL3 gene polymorphism and litter size in sheep. Year-round estrous sheep breeds(Small-tailed Han sheep,Cele black sheep and Hu sheep)and seasonal estrous sheep breeds(Tan sheep,Sunite sheep and Prairie Tibetan sheep)were selected and Sequenom Mass ARRAY~SNP assay was applied to genotype g.40674542C>T locus of FSTL3 gene. Then the association was analyzed between FSTL3 and litter size in Small-tailed Han sheep. The result of genotyping showed that three genotypes were found at g.40674542C>T locus in both year-round estrous and seasonal estrous sheep,there was no significant difference between year-round estrous and seasonal estrous sheep in both genotype frequency and allele frequency(P >0.05) of g.40674542C>T locus of FSTL3 gene. Population genetic analysis showed that the g.40674542C>T locus was at low polymorphism(PIC<0.25)in all sheep breeds.The χ2 test indicated that the g.40674542C>T locus of Small-tailed Han sheep,Hu sheep and Prairie Tibetan sheep was under Hardy-Weinberg equilibrium(P >0.05). Association analysis indicated that the polymorphism of g.40674542C>T had no correlation with the litter size of the first,second or third parity in Small-tailed Han sheep(P >0.05). Polymorphism of the g.40674542C>T locus of FSTL3 gene had no significant effect on litter size of Small-tailed Han sheep.更多还原