A Unique Evolution of the S2 Gene of Equine Infectious Anemia Virus in Hosts Correlated with Particular Infection Statuses

文献类型： 外文期刊

第一作者： Wang, Xue-Feng

作者： Wang, Xue-Feng;Wang, Shuai;Liu, Qiang;Lin, Yue-Zhi;Du, Cheng;Tang, Yan-Dong;Na, Lei;Wang, Xiaojun;Zhou, Jian-Hua;Zhou, Jian-Hua

作者机构：

关键词： equine infectious anemia virus;EIAV;S2 gene;evolution;diversity

期刊名称：VIRUSES-BASEL （ 影响因子：5.048； 五年影响因子：5.127 ）

ISSN： 1999-4915

年卷期： 2014 年 6 卷 11 期

页码：

收录情况： SCI

摘要： Equine infectious anemia virus (EIAV) is a member of the Lentivirus genus in the Retroviridae family that exhibits a genomic structure similar to that of HIV-1. The S2 accessory proteins play important roles in viral replication in vivo and in viral pathogenicity; however, studies on S2 evolution in vivo are limited. This study analyzed the evolutionary characteristics of the S2 gene of a pathogenic EIAV strain, EIAV(LN40), in four experimentally infected horses. The results demonstrated that 14.7% (10 of 68 residues) of the stable amino acid mutations occurred longitudinally in S2 during a 150-day infection period. Further analysis revealed that six of the ten mutated residues were positively selected during the infection. Alignment and phylogenetic analyses showed that the S2 gene sequences of viruses isolated from the infected horses at the early stage of EIAV(LN40) infection were highly homologous and similar to the vaccine-specific sequence. The S2 gene variants isolated from the febrile episodes and late phase of infection became homologous to the S2 gene sequence of the inoculating EIAV(LN40) strain. Our results indicate that the S2 gene evolves in diversity and divergence in vivo in different stages of EIAV infection and that this evolution correlates with the pathogenicity of the virus.

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