›› 2012, Vol. 39 ›› Issue (1): 122-127.

• 遗传繁育 • 上一篇    下一篇

63株IBV分离株M基因的遗传变异与系统进化分析

郑俏伟, 龚军, 刘大伟, 何琴, 王建华, 郭露铰, 徐成刚, 廖明, 任涛   

  1. 华南农业大学兽医学院,农业部动物疫病防控重点开放实验室,广东广州 510642
  • 收稿日期:2011-05-16 修回日期:1900-01-01 出版日期:2012-01-20 发布日期:2012-01-20
  • 通讯作者: 任涛

Genetic Variation and Phylogenetic Analysis of M Genes of 63 Isolate Strains of IBV

ZHENG Qiao-wei, GONG Jun, LIU Da-wei, HE Qin, WANG Jian-hua, GUO Lu-jiao, XU Cheng-gang, LIAO Ming, REN Tao   

  1. Key Laboratory of Animal Diseases Control and Prevention of the Ministry of Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
  • Received:2011-05-16 Revised:1900-01-01 Online:2012-01-20 Published:2012-01-20

摘要: 对1993-2010年从中国不同地区分离的63株传染性支气管炎病毒(infectious bronchitis virus,IBV)野毒株,采用RT-PCR方法克隆测定所分离野毒株的M基因核苷酸序列,并与GenBank中公布的部分国内外IBV毒株的M基因序列进行比较分析,研究中国IBV的分子流行病学特点和分子遗传变异规律。结果显示,所测毒株M基因具有6种不同长度的开放阅读框,这些长度的差异是由于5'端的核苷酸插入或缺失造成的;N端含有1~2个N-糖基化位点,其中1个糖基化位点"Asn-Cys-Thr"(NCT)是高度保守的。63个IBV分离株间氨基酸序列相似性为88.9%~100%,分离株与参考株间相似性为87.2%~100%。系统进化分析结果显示,本研究的63个IBV分离株可分为9个基因型,2005-2010年IBV中国流行株大部分与Mass型疫苗株处于不同的基因型,而且氨基酸序列相似性都小于94%。

关键词: IBV; M基因; 遗传变异; 系统进化分析

Abstract: The M genes of 63 infectious bronchitis viruses strains isolated in China from 1993 to 2010 were cloned and sequenced by RT-PCR to investigate the molecular epidemiology and genetic variation. Their sequences were also compared with those published in GenBank. The results showed that the nucleotide sequences of M gene had 6 different lengths. The nucleotide different in length resulted from insertion or deletion at the 5' terminus of M gene. There were 1 or 2 N-glycosylation site at the N terminus of M gene. The N-glycosylation site Asn-Cys-Thr was most conservative. The amino acid sequence similarities of M genes of 63 isolates were 87.2% to 100%. The amino acid sequence similarities of M genes of 63 isolates and referenced strains were 88.9% to 100%. 9 gentypes could be found among 63 IBV isolates in this study by the phylogenetic analysis. Most of IBV strains isolated in China from 2005 to 2010 were in different genotypes from vaccine strains of mass-genotype. The amino acid sequence similarities of M genes of the isolates from 2005 to 2010 and vaccine strains of mass-genotype were less than 94%.

Key words: IBV; M gene; genetic variation; phylogenetic analysis

中图分类号: