Molecular characterization of influenza B viruses isolated in east-central China in 2009–2010

被引:0
作者
Na Zhu
Peng Li
Jingfeng Yu
Yongdong Li
Jiuru Zhao
Han Xia
Shuang Tang
Zhong Zhang
Zheng Kou
Shiyu Yin
Zhaojun Fan
Tianxian Li
机构
[1] Chinese Academy of Sciences,State Key Laboratory of Virology, Wuhan Institute of Virology
[2] Gnomegen,undefined
[3] Inc.,undefined
[4] Kunming Yan’an Hospital,undefined
[5] Ningbo Municipal Center for Disease Control and Prevention,undefined
来源
Virus Genes | 2013年 / 46卷
关键词
Influenza B virus; Evolution; Molecular characterization; Phylogenetic analysis;
D O I
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中图分类号
学科分类号
摘要
The current circulating influenza B viruses can be divided into two major phylogenetic lineages: the Victoria and Yamagata lineages. We conducted a survey of influenza B viruses in Hubei and Zhejiang provinces during 2009–2010. Out of 341 throat swabs, 18 influenza B viruses were isolated. Five isolates were selected for genetic and phylogenetic analysis. The molecular analyses revealed that all the isolates had similar antigenic characteristics to B/Brisbane/60/2008. However, in the three viruses isolated from Zhejiang, a single asparagine to aspartic acid substitution in position 197 was observed, thereby eliminating the glycosylation at that site and possibly causing an antigenic change. None of the viruses had amino acid mutations at positions 116, 149, 152, 198, 222, 250, 291, and 402 of the neuraminidase (NA) gene, predicting that the viruses would still be sensitive to NA inhibitors. Phylogenetic analyses revealed that all five isolates were closely related to B/Brisbane/60/2008—the 2010 vaccine strain—and contained Victoria-like hemagglutinin and Yamagata-like NA genes, suggesting that reassortment may had occurred. In addition, similar phylogenetic patterns among the acidic polymerase, nucleoprotein and matrix protein genes, as well as between the basic polymerase 1 and basic polymerase 2 genes, were observed, suggesting possible functional interactions among these proteins. All the results highlighted the importance of molecular monitoring of influenza B viruses for reassortment and antigenic drift.
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页码:28 / 38
页数:10
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