《中国畜牧兽医》---唯一指定的官方网站 ›› 2015, Vol. 42 ›› Issue (9): 2254-2261.doi: 10.16431/j.cnki.1671-7236.2015.09.006

• 生物技术 • 上一篇    下一篇

2013年—2014年江西地区PRRSV分离株NSP2及ORF5基因的遗传变异分析

李海琴1, 林娟2, 刘垒3, 季华员1   

  1. 1. 江西省农业科学院畜牧兽医研究所, 南昌 330200;
    2. 南昌市动物疫病预防控制中心, 南昌 330008;
    3. 新余市渝水区下镇村农技站, 新余 338000
  • 收稿日期:2015-01-28 出版日期:2015-09-20 发布日期:2015-09-25
  • 通讯作者: 季华员 E-mail:47856041@qq.com
  • 作者简介:李海琴(1986-),女,江西南昌人,硕士,研究方向:畜禽传染病,E-mail:278030049@qq.com
  • 基金资助:

    江西省生猪产业技术体系综合试验推广站(JXARS-03);江西省农业科学院创新基金资助项目(2013CQN007)

Genetic Variation Analysis of NSP2 and ORF5 Genes of PRRSV Isolates in Jiangxi Province from 2013 to 2014

LI Hai-qin1, LIN Juan2, LIU Lei3, JI Hua-yuan1   

  1. 1. Institute of Animal Husbandry and Veterinary, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China;
    2. Center for Animal Disease Control and Prevention of Nanchang, Nanchang 330008, China;
    3. Agricultural Technique Station of Xiacun Towship in Yushui District, Xinyu City, Xinyu 338000, China
  • Received:2015-01-28 Online:2015-09-20 Published:2015-09-25

摘要: 为研究江西地区猪繁殖与呼吸综合征病毒(PRRSV) ORF5基因的变异情况及NSP2基因的结构特征,采用RT-PCR方法扩增了12份江西地区猪场疑似患PRRS的猪肺脏样品中的ORF5全序列和NSP2部分序列,应用DNAStar和Mega 6.0等软件对所得序列进行同源性比对及遗传变异分析。12株PRRSV ORF5核苷酸同源性为83.7%~99.8%,氨基酸同源性为82.1%~99.5%;与参考毒株JXA1、VR-2332和LV的核苷酸同源性分别为84.9%~99.7%、85.2%~91.0%和62.4%~64.8%。对阳性病料进行了NSP2基因部分序列的扩增,测序结果显示12株PRRSV均属于美洲型毒株,12株PRRSV的NSP2部分序列均存在30个氨基酸的不连续缺失,与高致病性PRRSV有相同的缺失特征。12株PRRSV的ORF5遗传进化树分析显示,10株与高致病性PRRSV处在同一进化分支,进一步说明高致病性PRRSV已成为江西地区的优势流行毒株。

关键词: 猪繁殖与呼吸综合征病毒; ORF5基因; NSP2基因; 变异分析

Abstract: To study the genetic varations of ORF5 and NSP2 genes of porcine reproductive and respiratory syndrome virus (PRRSV) isolates in Jiangxi province from 2013 to 2014, the complete ORF5 gene and subsequence of NSP2 gene of PRRSV were amplified by RT-PCR from lung samples of swine in Jiangxi.Sequence comparison and genetic variation analysis were conducted by DNAStar and Mega 6.0.The results showed that the homologies of ORF5 genes among the 12 PRRSV isolates were 83.7% to 99.8% and 82.1% to 99.5% in nucleotide and amino acid sequences, respectively.Compared to the reference strains JXA1, VR-2332 and LV, the homologies were 84.9% to 99.7%, 85.2% to 91.0% and 62.4% to 64.8%, respectively.Nsp2 sequences were amplified from positive samples and compared with the other published sequences, it indicated that 12 PRRSV isolates from Jiangxi belonged to Northern American genotype, 12 isolates had 30 amino acids discontinuous deletions in NSP2 protein which showed a typical structure as previously reported for highly pathogenic PRRSV.The phylogenetic tree of ORF5 of 12 isolates indicated that 10 PRRSV isolates were in the same branch with the highly pathogenic PRRSV, which showed that the highly pathogenic PRRSV had become the dominant PRRSV epidemic strain in Jiangxi.

Key words: porcine reproductive and respiratory syndrome virus (PRRSV); ORF5 gene; NSP2 gene; variation analysis

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