畜牧兽医学报 ›› 2014, Vol. 45 ›› Issue (7): 1068-1074.doi: 10.11843/j.issn.0366-6964.2014.07.006

• 遗传繁育 • 上一篇    下一篇

基于Cytb 基因多态性对藏獒群体遗传结构及系统进化的研究

杨雪娇,任战军*,张成东,白康   

  1. (西北农林科技大学动物科技学院,杨凌 712100)
  • 收稿日期:2014-01-23 出版日期:2014-07-23 发布日期:2014-07-23
  • 通讯作者: 任战军,副教授,硕士生导师,主要从事经济动物方面的研究,E-mail:renzhanjun@nwsuaf.edu.cn
  • 作者简介:杨雪娇(1987-),女,河北保定人,硕士生,主要从事动物遗传资源方面的研究,E-mail:635993403@qq.com

Genetic Structure and Phylogenetic Evolution Analysis Based on Cytb Gene Polymorphism of Tibetan Mastiff

YANG Xue-jiao,REN Zhan-jun*,ZHANG Cheng-dong,BAI Kang   

  1. (College of Animal Science and Technology,Northwest A&F University,Yangling 712100,China)
  • Received:2014-01-23 Online:2014-07-23 Published:2014-07-23

摘要:

本试验通过对甘肃藏獒和西藏藏獒共70个个体的线粒体Cytb基因进行扩增测序,应用生物信息学软件进行遗传结构和系统进化分析,为藏獒品种资源保护与合理开发利用提供参考依据。结果表明:在所分析的70条藏獒序列中,共检测到6种单倍型,8个多态位点,仅占分析总位点数的0.7%。甘肃藏獒与西藏藏獒的单倍型多样度(Hd)、核苷酸多样度(Pi)、平均核苷酸差异数(K)分别为0.595、0.002 37、2.703和0.674、0.002 51、2.857,即2个藏獒群体的遗传多样性水平相近。2个群体之间存在很强的基因流,未发生遗传分化,变异主要来自群体内部。根据Cytb基因单倍型网络图和系统发育树推断甘肃和西藏地区的藏獒为单一母系起源,逐步形成3个进化分支。

Abstract:

In order to provide reference for resource protection,rational development and utilization of Tibetan Mastiff,70 samples from Tibet and Gansu were studied.Genetic structure and phylogenetic evolution analysis were explored using sequencing method and bioinformatics softwares,based on mitochondrial Cytb gene.A total of 6 haplotypes were detected and 8 polymorphic loci accounting for 0.7% of the analyzed sites were found.The two populations had similar genetic diversity,the haplotype diversity(Hd),nucleotide diversity(Pi),the average number of nucleotide difference(K)of them were 0.595,0.002 37,2.703 and 0.674,0.002 51,2.857,respectively.The gene flow between the two populations was strong and variation mainly was from within populations.Infered from the haplotype network and phylogenetic tree,Tibetan Mastiff had single maternal origin which evolved into 3 branches.

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