畜牧兽医学报 ›› 2006, Vol. 37 ›› Issue (11): 1130-1134.doi:

• 遗传繁育 • 上一篇    下一篇

南江黄羊LHβ基因序列测定及分析

李利;张红平;吴登俊   

  1. 四川农业大学动物科技学院,雅安 625014
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-11-25 发布日期:2006-11-25

Sequencing and Analysis of Luteinizing Hormone Beta Gene from Nanjiang Huang Goat

  • Received:1900-01-01 Revised:1900-01-01 Online:2006-11-25 Published:2006-11-25

摘要: 参照GenBank中发表的奶牛、绵羊和猪LHβ基因序列设计引物,以35只南江黄羊为研究对象,利用PCR技术扩增并测定了山羊LHβ基因部分序列(GenBank登录号:AY853264),并利用GenBank中不同物种LHβ基因的部分编码区序列进行了系统发育分析。结果表明:在测定出的929bp序列中,包含LHβ基因5′侧翼区(136bp)、2个内含子全序列(分别为297bp和235bp)、第1和第2外显子全序列(分别为26bp和168bp)以及第3外显子部分序列(67bp)。除第1外显子前11bp为5′非翻译区外,其余外显子序列共编码83个氨基酸,前20个氨基酸为信号肽序列。山羊LHβ基因序列富含GC。在测定的35个个体中共检测到8个单碱基突变位点,位于外显子中的2个突变位点均为同义突变,其余6个突变位点位于5′侧翼区和内含子。系统发育分析结果与物种实际的演化顺序不完全相符,可能是由物种间LHβ基因GC含量的较大差异引起。本研究首次报道了山羊LHβ基因序列,为进一步探明山羊繁殖性能的遗传机理奠定了基础。

Abstract: According to the LHβ gene sequence of cow, sheep and pig in GenBank, the primers were designed and partial sequence of LHβ gene from 35 Nanjiang Huang goat blood samples were amplified and sequenced by PCR method (GenBank No:AY853264). Furthermore, phylogenetic tree of different species were conducted using the LHβ partial coding sequence. The result showed that the 929bp partial sequence of LHβ gene included 5′flanking region (136bp), two introns (297bp and 235bp), two exons (26bp and 168bp) and partial sequence of exon3 (67bp). Exon sequence coded 83 amino acids except the 11bp nucleotide at the beginning of 1st exon ,which was the 5′untranslating region(5′UTR), while the first 20 amino acids were the signal peptide. LHβ gene was rich with GC. Eight nucleotide mutations were detected and two of them existed in exon were synonymous mutation. Phylogenetic relationship was not in accord with the actual species evolution process, which maybe caused by the different GC proportion of LHβ gene among species. It was the first time to report goat LHβ gene sequence which established the foundation of the further research about genetic principle of goat reproduction.