数字农科院2.0

Genetic evolution of Gallid herpesvirus 2 isolated in China

文献类型： 外文期刊

作者： Lv, Hongchao;Zhang, Yanping;Sun, Guorong;Bao, Keyan;Gao, Yulong;Qi, Xiaole;Cui, Hongyu;Wang, Yongqiang;Li, Kai;Gao, Li;Pan, Qing;Wang, Xiaomei;Liu, Changjun

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关键词： Gallid herpesvirus 2;Virulence;Mardivirus;Genome

期刊名称： INFECTION GENETICS AND EVOLUTION

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年卷期：

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收录情况： SCI

摘要： Gallid herpesvirus 2 (GaHV-2), which causes Marek's disease in chickens and has caused extensive economic losses, has recently evolved increased virulence in China. To better understand the genetic basis of the pathogenic characteristics changed and increased virulence, we sequenced the genomes of six new GaHV-2 strains (LCC, LTS, WC/1203, JL/1404, CC/1409, and HS/1412) isolated from chickens with failed immunisation as well as one previously isolated Chinese GaHV-2 strain, J-1. Based on a multiple sequence alignment, several characteristic point mutations were detected in the open reading frames of the Chinese isolates. In addition, two deletions and an insertion were identified at the unique short region and terminal repeat short region junctions in Chinese isolates, and the insertion was a characteristic of the new Chinese isolates. According to a phylogenetic analysis, the GaHV-2 genome diverged substantially over the last two decades in China. Based on the internal repeat long region, the new isolates were closely related to very virulent or very virulent plus strains. Additionally, the new Chinese isolates diverged from the previously isolated strains J-1 and 814. In conclusion, our results provide evidence that Chinese GaHV-2 strains contain characteristic sequences, especially the new isolates. The observed genetic divergence in the new Chinese GaHV-2 strains over the last two decades may be related to observed changes in pathogenic characteristics and virulence. (C) 2016 Elsevier B.V. All rights reserved.

分类号： R1

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