动物医学进展
動物醫學進展
동물의학진전
PROGRESS IN VETERINARY MEDICINE
2014年
12期
49-53
,共5页
猪瘟病毒%E2 基因%分子流行病学%变异分析
豬瘟病毒%E2 基因%分子流行病學%變異分析
저온병독%E2 기인%분자류행병학%변이분석
Classical swine fever virus%E2 gene%molecular epidemiology%variance analysis
为了解陕西咸阳地区猪瘟流行毒株 E2基因变异情况,采用套式 PCR 方法,扩增了17个流行毒株和2个市售疫苗毒株 E2基因主要抗原区,并进行了序列比对分析。结果表明,17个流行毒株和兔化弱毒株(HCLV)株相比,E2基因主要抗原区核苷酸同源性在79.0%~80.9%,氨基酸同源性在80.0%~84.4%。市售疫苗和 HCLV 株核苷酸同源性为93.4%,氨基酸同源性为90.0%。系统发育树分析发现17个流行毒株同属基因Ⅱ群。流行毒株与 HCLV 相应氨基酸位点相比,总体变异氨基酸位点占26.4%,呈现出典型的变异特征。17个流行毒株在2个氨基酸关键位点出现了705(T→I)、729(L→A)变异现象,可能导致抗原性发生改变。发现 E2蛋白高保守序列 RYLASLH(713~719)变异现象,即 XYSY01株719位发生了 H→R 变异。结果提示,近年陕西咸阳地区猪瘟病毒流行毒株变异较为一致,E2基因核苷酸与编码氨基酸有较明显的变异。
為瞭解陝西鹹暘地區豬瘟流行毒株 E2基因變異情況,採用套式 PCR 方法,擴增瞭17箇流行毒株和2箇市售疫苗毒株 E2基因主要抗原區,併進行瞭序列比對分析。結果錶明,17箇流行毒株和兔化弱毒株(HCLV)株相比,E2基因主要抗原區覈苷痠同源性在79.0%~80.9%,氨基痠同源性在80.0%~84.4%。市售疫苗和 HCLV 株覈苷痠同源性為93.4%,氨基痠同源性為90.0%。繫統髮育樹分析髮現17箇流行毒株同屬基因Ⅱ群。流行毒株與 HCLV 相應氨基痠位點相比,總體變異氨基痠位點佔26.4%,呈現齣典型的變異特徵。17箇流行毒株在2箇氨基痠關鍵位點齣現瞭705(T→I)、729(L→A)變異現象,可能導緻抗原性髮生改變。髮現 E2蛋白高保守序列 RYLASLH(713~719)變異現象,即 XYSY01株719位髮生瞭 H→R 變異。結果提示,近年陝西鹹暘地區豬瘟病毒流行毒株變異較為一緻,E2基因覈苷痠與編碼氨基痠有較明顯的變異。
위료해협서함양지구저온류행독주 E2기인변이정황,채용투식 PCR 방법,확증료17개류행독주화2개시수역묘독주 E2기인주요항원구,병진행료서렬비대분석。결과표명,17개류행독주화토화약독주(HCLV)주상비,E2기인주요항원구핵감산동원성재79.0%~80.9%,안기산동원성재80.0%~84.4%。시수역묘화 HCLV 주핵감산동원성위93.4%,안기산동원성위90.0%。계통발육수분석발현17개류행독주동속기인Ⅱ군。류행독주여 HCLV 상응안기산위점상비,총체변이안기산위점점26.4%,정현출전형적변이특정。17개류행독주재2개안기산관건위점출현료705(T→I)、729(L→A)변이현상,가능도치항원성발생개변。발현 E2단백고보수서렬 RYLASLH(713~719)변이현상,즉 XYSY01주719위발생료 H→R 변이。결과제시,근년협서함양지구저온병독류행독주변이교위일치,E2기인핵감산여편마안기산유교명현적변이。
The nested PCR was used to analyze E2 gene major antigen region of the 17 strains and two vac-cine strains in order to reveal the variation of classical swine fever virus E2 gene in Xianyang.The results showed that,the nucleotide homology and acid homology of E2 gene major antigen region is respectively between 79.0%-80.9%,80.0%-84.4%.The nucleotide homology was 93.4%,amino acid homology was 90.0%.Phylogenetic tree analysis howed that 17 pandemic strains belong to genotype Ⅱ group.Compared with HCLV amino acid sites,the variation of amino acid sites accounted for 26.4%,showing a typical var-iation characteristics.The mutation appeared in two key sites 705 (T→I),729 (L→A)of epidemic strains, it may lead to antigenic changes.The variation was found in 719 (H→R)site of XYSY01 strain.The re-sults suggested the mutation of classical swine fever virus pandemic strain is relatively consistent in Xian-yang,and E2 gene nucleotide and encoded amino acids had obvious variation.