Unique evolution characteristics of the envelope protein of EIAV(LN40), a virulent strain of equine infectious anemia virus

文献类型： 外文期刊

第一作者： Wang, Xuefeng

作者： Wang, Xuefeng;Wang, Shuai;Lin, Yuezhi;Jiang, Chenggang;Ma, Jian;Zhao, Liping;Lv, Xiaoling;Shen, Rongxian;Zhou, Jianhua;Wang, Xuefeng;Wang, Fenglong

作者机构：

关键词： Equine infectious anemia virus;Envelope protein;Evolution characteristics

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

ISSN： 0920-8569

年卷期： 2011 年 42 卷 2 期

页码：

收录情况： SCI

摘要： The Chinese equine infectious anemia virus (EIAV) virulent strain EIAV(LN40) is derived from a naturally occurring virus by continuously passing in horses for 16 generations. Its genome sequence is 23% different from that of the American strains or the Japanese strains, and the variation of envelope gp90 surface unit (SU) is as high as 41%. In this study, evolutions of the EIAV(LN40) gp90 gene in four infected horses were analyzed. Results showed that new quasispecies arose in the early stage of infection in all EIAV(LN40)-infected horses. These quasispecies belonged to branches different from EIAV(LN40) in a phylogenetic tree. In contrast, the gp90 sequences of viruses isolated after disease onset remained in the same phylogenetic branch as EIAV(LN40), with some having exactly the same sequences. The glycosylation sites 191NSSN and 237NNTW in the V3 and V4 region present or absent simultaneously in most of the predicted amino acid sequences. Changes in the glycosylation sites within V3, V4, and V5 regions are usually associated with the disease status. Glycosylation sites (191NSSN, 237NNTW, and 280NDTS) within these three regions were present in EIAV(LN40) and most of the quasispecies isolated after, but not before disease onset. These unique evolutionary characteristics of SU have not been reported for EIAV and other lentiviruses. Our results provide a reference for a further understanding of the mechanism underlying the persistent infection and escape from immune surveillance of EIAV.

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