褐家鼠携带2株汉坦病毒的遗传特征分析

目的 分析来自内蒙古自治区呼和浩特市和河南省杞县两地褐家鼠标本中的汉坦病毒(HV)遗传特征,研究其与已知HV及疫苗株之间的关系.方法 提取病毒总RNA,用反转录-聚合酶链式反应法扩增阳性标本中HV的全M、S基因片段,测序后进行序列特征和系统发生分析.结果 成功扩增出2株HV(NM133株和Q12株)的全M、S基因片段,并测定序列.2株病毒的S基因片段核苷酸序列全长分别为1770nt和1772 nt,均仅有1个开放读码框(ORF),编码429个氨基酸,M基因片段核苷酸序列全长均为3654 nt,编码1133个氨基酸.2株HV与绝大部分已知的汉城病毒(SEOV)具有很高的同源性;但与汉滩病毒(HTNV)等其他型HV同源性较低.2株病毒的核蛋白、糖蛋白氨基酸序列与疫苗株Z37具有一致的二级结构.另外,在用全S和M基因片段核苷酸序列所构建的系统进化树中,2株病毒被分在SEOV的Ⅰ亚型,与Hb8610、R22、HB55、L99以及K24-e7的亲缘关系最近.结论 2株病毒为SEOV的Ⅰ亚型,与包括疫苗株Z37在内的已知SEOV具有很高的同源性和一致的二级结构,提示当前的疫苗能有效预防SEOV引起的肾综合征出血热.

Genetic analysis of hantaviruses carried by Rattus norvegicus collected from Henan and Neimenggu provinces, China

Objective Genetic analysis was performed to infer the relationship between hantaviruses carried by Rattus norvegicus from Henan and Neimenggu provinces and the other known hantavirus and the vaccine strain. Methods Total RNA was extracted from lung tissues with Trizol reagent. The complete M and S segment sequences of strains NM133 and Q12 were amplified by RT-PCR. The purified DNA fragments were directly subjected to sequencing, and then to sequence analysis and phylogenetic analysis. Results The complete S segment sequences of strains NM133 and Q12 were found to be 1770 nt and 1772 nt in length respectively, with one open reading frame encoding 429 amino acids. The complete M segment sequences of both two strains are 3654 nucleotide in length encoding a protein of 1133 amino acids. The two strains shared a high degree of homology with most of known Seoul virus (SEOV) but quite different from Hantaan virus and other hantaviruses. Furthermore, the nucleoprotein and glycoprotein of the two strains had the congruent structure with the vaccine strain Z37. On the S- and M-phylogenetic trees, both strains (NM133 and Q12) were grouped into the first cluster of SEOV, and were more closely related to the strains, such as: Hb8610, R22, HB55, L99, and K24-e7. Conclusion Both strains (NM133 and Q12) belonged to SEOV, and sharing a high degree of homology and similar secondary structure with strains including the vaccine strains Z37, our data suggested that the present vaccine used in China could effectively prevent HFRS caused by SEOV.