Evolution and homologous recombination of the hemagglutinin-esterase gene sequences from porcine torovirus

文献类型： 外文期刊

第一作者： Cong, Yingying

作者： Cong, Yingying;Wang, Xin;Suo, Siqingaowa;Ren, Yudong;Ren, Xiaofeng;Zarlenga, Dante S.;Richt, Juergen A.;Wang, Yang;Wang, Jingfei;Wang, Jingfei

作者机构：

关键词： Evolution;Homologous recombination;Porcine torovirus;Selection pressure

期刊名称：VIRUS GENES （ 影响因子：2.332； 五年影响因子：2.0 ）

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年卷期：

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收录情况： SCI

摘要： The objective of the present study was to gain new insights into the evolution, homologous recombination, and selection pressures imposed on the porcine torovirus (PToV), by examining the changes in the hemagglutinin-esterase (HE) gene. The most recent common ancestor of PToV was estimated to have emerged 62 years ago based upon HE gene sequence data obtained from PToV isolates originating from Spain, South Korea, Netherlands, Hungary, and Italy and using the HE gene of Bovine torovirus isolates Niigata1 (AB661456) and Niigata3 (AB661458) as outgroups. The HE gene sequence data segregated all the PToV isolates into two well-supported monophyletic groups; however, various isolates from Spain, Italy, and South Korea did not segregate geographically suggesting very recent translocation of the viruses to these localities. Evidence of recombination was observed between two South Korean isolates that partitioned into two distinct subclades. Data further suggest that most of the nucleotides in the HE gene are under negative selection; however, changes within codon 237 showed an evidence of positive selection.

分类号： R37

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