猪繁殖与呼吸综合征病毒分离株GP5蛋白ORF5基因的克隆与序列分析

为揭示广东地区猪繁殖与呼吸综合征(porcine reproductive and respiratory syndrome,PRRS)可能的流行规律,本研究采用RT-PCR的方法扩增5株来自广东地区猪场临床样品的猪繁殖与呼吸综合征病毒(porcine reproductive and respiratory syndrome virus, PRRSV)分离株的GP5蛋白ORF5基因,将其克隆、测序后与国内外部分毒株相应基因进行核苷酸序列比较。结果表明,PRRSV-2011-GD2、PRRSV-2011-GD3、PRRSV-2013-GD1、PRRSV-2013-GD2和PRRSV-2013-GD3株与美洲型参考株(VR-2332) 的核苷酸序列同源性分别为88.8%、99.5%、88.7%、88.7%和83.5%。系统进化树分析结果表明,PRRSV-2011-GD2、PRRSV-2011-GD3、PRRSV-2013-GD1、PRRSV-2013-GD2和PRRSV-2013-GD3株均属于美洲型。以上结果为更好地了解PRRSV的分子流行病学特征和抗原变异规律提供依据, 同时为研制基因工程疫苗奠定了基础。

Cloning and Sequence Analysis of GP5 Genes of Porcine Reproductive and Respiratory Syndrome Virus Prevalence Strains

In order to reveal the Guangdong region of porcine reproductive and respiratory syndrome (PRRS) epidemic law, 5 strains of swine clinical samples amplified from Guangdong region of PRRSV GP5 genes of the isolates with the method of RT-PCR, cloned, sequenced and domestic and foreign strains corresponding gene nucleotide sequence comparison in this study.The results showed that PRRSV-2011-GD2, PRRSV-2011-GD3, PRRSV-2013-GD1, PRRSV-2013-GD2 and PRRSV-2013-GD3 strains with the American type reference strains (ATCC VR-2332 U87392) nucleotide sequence homology were 88.8%, 99.5%, 88.7%, 88.7% and 83.5%,respectively. The phylogenetic tree analysis indicated that PRRSV-2011-GD2, PRRSV-2011-GD3, PRRSV-2013-GD1, PRRSV-2013-GD2 and PRRSV-2013-GD3 strains belonged to the American.The results provided the basis for a better understanding of the molecular epidemiology of PRRSV features and antigenic variation law, also laid the foundation for the study of gene engineering vaccine.