2012年河南省猪流行性腹泻病毒分离株S1基因遗传变异分析  

Genetic Variation Analysis of S1 Genes of Porcine Epidemic Diarrhea Virus Isolated from Henan in 2012

作　　者：陈慧娟[1] 吴志明[2] 闫若潜[2] 赵雪丽[2] 赵明军[2] 周兵强[2] 孔刚锐 闫志玲 程俊贞[2] 靳利粉 

机构地区：[1]河南农业大学牧医工程学院,河南郑州450002 [2]河南省动物疫病预防控制中心,河南郑州450008

出　　处：《中国畜牧兽医》2014年第3期14-18,共5页China Animal Husbandry & Veterinary Medicine

基　　金：河南省科技攻关计划项目"猪流行性腹泻病毒分子流行病学调查及其致病性研究"(132102110159)

摘　　要：为分析2012年河南省猪流行性腹泻病毒（PEDV）的遗传变异情况，本研究设计合成2对扩增s1基因的特异性引物，利用RT—PCR方法，对2012年分离的5株PEDV毒株的S1基因进行扩增、克隆和序列测定，并对其进行遗传进化分析。结果表明，5株PEDVs1基因核苷酸和氨基酸同源性分别为98．3％～99．5％和97．1％～98．9％；与2011年以来国内登录的PEDV流行变异株核苷酸同源性为88．6％～98．0％，氨基酸同源性为85．3％～98．7％；与经典毒株cV777核苷酸同源性为88．7％～89．1％，氨基酸同源性为87．3％～88．4％。5株分离株s1基因均存在相同的插入和缺失，与2011年以来国内登录的流行变异毒株相比没有大的变异，但与参考毒株CV777相比，在163l66bp处有3个核苷酸插入；在l73l74bp之间有9个核苷酸插人；在405—406bp之间有3个核苷酸插入；在463464bp之间有3个核苷酸缺失，这些位点核苷酸的插入和缺失导致了其编码的氨基酸相应改变。s1基因系统进化树分析结果表明，5株分离株与2011年以来国内登录的流行变异毒株均属于基因Ⅲ群，与2011年国内登录的少部分PEDV基因Ⅰ群流行毒株的核苷酸同源性为88．6％～89．3％，氨基酸同源性为85．3％～86．9％，而经典毒株CV777所在分支群属于基因Ⅱ群。本试验结果表明，2011年以来，中国流行的PEDV毒株中同时有基因Ⅲ和Ⅰ群的存在，但以基因Ⅲ群毒株为主，其致病性和抗原性差异仍有待进一步研究。We designed and synthesized two pairs of specific primers amplified S1 gene by RT PCR method to investigate the variation in S1 genes of porcine epidemic diarrhea virus （PEDV） in 2012 in Henan. $1 genes of 5 PEDV strains were cloned and sequenced, and their phylogenetic trees were analyzed from different swine breeding farms. Sequences analysis showed that S1 genes shared 98.3% to 99.5% nucleotide identities and 97.1% to 98.9% amino acids homologies among five PEDV iso lates. Compared with domestic landing PEDV from 2011, the nucleotide homologies were 88.6 % to 98.0% and amino acid ho- mologies were 85.3% to 98.7%. Compared with CV777, the nucleotide homologies were 88.7% to 89.1% and amino acid ho- mologies were 87.3% to 88.4%. Homology analysis showed that S1 genes of 5 isolates shared the same genetic mutation, there were the same insertions and deletions. Compared with domestic mutant strains landed from 2011, there was no tenden- cy. However, compared with CV777, there were three nucleotide insertions from 163 to 166 bp, nine nucleotide insertions from 173 to 174 bp, three nucleotide insertions from 405 to 406 bp and three nucleotide deletions from 463 to 464 bp. These in- sertions and deletions of nucleotides led to its corresponding changes in encoding amino acids. Phylogenetic analysis showed that S1 genes of 5 PEDV strains belonged to the third group. However compared with part of PEDV first group domestic mutant strains landed in 2011, the nucleotide homologies were 88.6% to 89.3% and amino acid homologies were 85.3% to 86.9% .CV777 was the second group. The results showed that S1 genes of PEDV prevalent strain exist in first and third groups, but mainly prevailing third group strains, the pathogenic and antigenic differences of these strains should be further studied.

关 键 词：猪流行性腹泻病毒 S1基因 遗传变异 分析 

分 类 号：Q78[生物学—分子生物学]