汉坦病毒四川分离毒株SN7——HTN的新亚型

A new subtype of Hantavirus SN7 isolated from Niviventer Confucianus in Sichuan province, China

目的 对四川省社鼠分离株SN7进行生物学和分子生物学鉴定。方法 应用单克隆抗体抗原性分析和空斑减少中和试验 (PRNT)和PCR分型方法分析、克隆测定了SN7株的M和S片段基因 ,并同汉坦病毒其他病毒株进行比较。结果 单克隆抗体和PRNT、PCR分型方法均无法对SN7株定性 ,序列分析表明SN7毒株与现有的HTN型毒株M片段同源性为 80 .2 %～ 87.1% ,差异高达 12 .9%～ 19.8% ;S片段为 76 .6 %～ 92 .0 % ,差异也高达 8%～ 2 3.4 % ,而与SEO毒株M片段的同源性为 70 .0 %～ 71.6 % ,S片段为 71.0 %～ 72 .2 % ,SN7株病毒可以定型为HTN型病毒。结论 SN7株为HTN型的新亚型毒株。

Objective To identify the biological and molecular biological characteristics of SN7 virus isolated from Niviventer Confucianus in Sichuan province. Methods Monoclonal antibody, PRNT and PCR antigenicity analysis and genotyping of SN7 strain were performed. M and S segments of SN7 genome were also cloned and sequenced. The sequences were compared with those of other strains of Hantavirus. Results It was difficult to identify SN7 by using monocloncal antibody, PRNT and PCR. With sequence comparison, we found that strain SN7 had high homology(80.2%～87.1% of M segment and 76.6%～92.0% of S segment) with HTN type strains, and relatively low homology(70.0%～71.6% of M segment and 71.0%～72.2% of S segment) with SEO type strains. Strain SN7 was believed to belong to HTN type. Conclusions SN7 is a new subtype strain of HTN type viruses. It is possible that Hantavirus has immune escape in its natural hosts.