Detection of the FecX^R Mutation of BMP15 Gene in Sheep and Goats

PCR-SSCP was used to detect mutations of bone morphogenetic protein 15(BMP15) gene in both high prolificacy(Small Tail Han sheep,Hu sheep,Jining Grey goat and Boer goat) and low prolificacy breeds(Dorset sheep,Texel sheep,Inner Mongolia Cashmere goat and Angora goat).Both the nucleotide sequences and the amino acid sequences were compared in amplification fragments of both Small Tail Han sheep and Jining Grey goat.The results indicated that none of the four sheep and the four goat breeds carried the same FecXR mutation of the BMP15 gene as do Rasa Aragonesa sheep.The nucleotide sequence of Small Tail Han sheep was completely identical with that of the sheep BMP15 sequence(GenBank AF236079,NM001114767).Three base substitutions(T529G,C530G and T576C) and two amino acid changes(V155G and S171P) were found in Jining Grey goat compared with Small Tail Han sheep.The FecXR mutation of the BMP15 gene had no significant effect on high prolificacy of Small Tail Han sheep, Hu sheep,Jining Grey goat and Boer goat.

神经肽Y基因多态性及其与小尾寒羊产羔数的关系

本研究旨在阐明神经肽Y(neuropeptide Y,NPY)基因的多态性及其与小尾寒羊产羔数的关系,为绵羊多羔性的标记辅助选择提供科学依据。采用PCR-SSCP技术检测NPY基因全部3个外显子在小尾寒羊、湖羊、特克塞尔和多赛特羊中的单核苷酸多态性,分析该基因对小尾寒羊多羔性的影响。仅引物P1扩增片段存在多态性,在小尾寒羊中检测到5种基因型,在湖羊和多赛特羊中检测到3种基因型,而在特克塞尔羊中仅检测到1种基因型;测序分析显示,在小尾寒羊中存在CR、TR和TW 3种等位基因,在湖羊和多赛特羊中存在CR和TR 2种等位基因,而在特克塞尔中仅存在CR 1种等位基因。TR与CR相比在绵羊NPY基因编码区第93 bp处发生了1个C→T的单碱基突变;TW与CR相比除发生C93T的单碱基突变外,还在130和131 bp发生了GA→AT的双碱基突变,该突变引起绵羊NPY成熟肽第16位氨基酸由天冬氨酸变为异亮氨酸。对于多态位点C/T,小尾寒羊3种基因型之间产羔数差异均不显著(P>0.05)。对于多态位点GA/AT,RW型小尾寒羊产羔数平均比RR型的多0.56只(P<0.05)。在小尾寒羊5种复合基因型中,TTRW和CTRW型小尾寒羊产羔数差异不显著(P>0.05);TTRR、CTRR和CCRR型小尾寒羊产羔数差异也不显著(P>0.05);TTRW和CTRW型小尾寒羊产羔数均显著高于其余3种基因型(P<0.05)。本研究结果初步表明NPY基因GA/AT突变位点的W等位基因是提高绵羊产羔数的1个潜在有效的DNA标记。