Serotype shift of a 793/B genotype infectious bronchitis coronavirus by natural recombination

文献类型： 外文期刊

第一作者： Zhang, Tingting

作者： Zhang, Tingting;Han, Zongxi;Xu, Qianqian;Wang, Qiuling;Gao, Mengying;Wu, Wei;Shao, Yuhao;Li, Huixin;Kong, Xiangang;Liu, Shengwang

作者机构：

关键词： Infectious bronchitis coronavirus;Recombination;Genotype;Serotype;Vaccination-challenge test

期刊名称：INFECTION GENETICS AND EVOLUTION （ 影响因子：3.342； 五年影响因子：3.188 ）

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收录情况： SCI

摘要： An infectious bronchitis coronavirus, designated as ck/CH/LHLJ/140906, was isolated from an infectious bronchitis virus (IBV) strain H120-vaccinated chicken flock, which presented with a suspected infectious bronchitis virus (IBV) infection. A phylogenetic analysis based on the Si gene clustered ck/CH/LHLJ/140906 with the 793/B group; however, a pairwise comparison showed that the 5' terminal of the S1 gene (containing hypervariable regions I and II) had high sequence identity with the H120 strain, while the 3' terminal sequence was very similar to that of IBV 4/91 strain. A SimPlot analysis of the complete genomic sequence, which was confirmed by a phylogenetic analysis and nucleotide similarities using the corresponding gene fragments, suggested that isolate ck/CH/LHLJ/140906 emerged from multiple recombination events between parental IBV strains 4/91 and H120. Although the isolate ck/CH/LHLJ/ 140906 had slightly higher S1 amino acid sequence identity to strain 4/91 (88.2%) than to strain H120 (86%), the serotype of the virus was more closely related to that of the H120 strain (32% antigenic relatedness) than to the 4/91 strain (15% antigenic relatedness). Whereas, vaccination of specific pathogen-free chickens with the 4/91 vaccine provided better protection against challenge with ck/CH/LHLJ/ 140906 than did vaccination with the H120 strain according to the result of virus re-isolation. As the spike protein, especially in the hypervariable regions of the S1 domain, of IBVs contains viral neutralizing epitopes, the results of this study showed that recombination of the Si domain resulted in the emergence of a new serotype. (C) 2015 Elsevier B.V. All rights reserved.

分类号： R1

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