Genetic and biological characterization of H9N2 avian influenza viruses isolated in China from 2011 to 2014.

Genetic and biological characterization of H9N2 avian influenza viruses isolated in China from 2011 to 2014.
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2011-2014年中国分离的H9N2禽流感病毒的遗传和生物学特征

DOI:
10.1371/journal.pone.0199260
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Liu X
Liu X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhu R;Xu D;Yang X;Zhang J;Wang S;Shi H;Liu X

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自2013年以来,H9N2禽流感病毒的基因型发生了变化,当时在中国鸡群中传播的几乎所有H9N2病毒都是基因型57(G57),每个基因都有最适合的谱系。为了表征2011年至2014年的H9N2变异病毒,从2011年至2014年中国活禽市场分离出28种H9N2流感病毒,并进行遗传和生物学特征分析。我们的研究结果表明,2011 年至 2014 年期间,HA 蛋白的 16 个改变抗原性的残基、两个潜在的 N 连接糖基化位点以及受体结合位点中的一个氨基酸发生了显着变化。此外,系统发育树中的HA和NA基因根据分离年份主要聚类成两个独立的分支A和B。 H9N2病毒的内部基因与人类感染的禽流感病毒H5N1、H7N9和H10N8的内部基因相关。特别是,系统发育树中的 NS 基因揭示了病毒基因的遗传分化,分为 A、B 和 C 三个分支,分别与 H9N2、H10N8 和 H7N9 病毒相关。此外,分离株还表现出不同程度的感染和空气传播。这些结果表明,H9N2病毒在2011-2014年间经历了适应性进化和变异。
The genotypes of the H9N2 avian influenza viruses have changed since 2013 when almost all H9N2 viruses circulating in chickens in China were genotype 57 (G57) with the fittest lineage of each gene. To characterize the H9N2 variant viruses from 2011 to 2014, 28 H9N2 influenza viruses were isolated from live poultry markets in China from 2011–2014 and were analyzed by genetic and biological characterization. Our findings showed that 16 residues that changed antigenicity, two potential N-linked glycosylation sites, and one amino acid in the receptor binding site of the HA protein changed significantly from 2011–2014. Moreover, the HA and NA genes in the phylogenetic tree were mainly clustered into two independent branches, A and B, based on the year of isolation. H9N2 virus internal genes were related to those from the human-infected avian influenza viruses H5N1, H7N9, and H10N8. In particular, the NS gene in the phylogenetic tree revealed genetic divergence of the virus gene into three branches labeled A, B, and C, which were related to the H9N2, H10N8, and H7N9 viruses, respectively. Additionally, the isolates also showed varying levels of infection and airborne transmission. These results indicated that the H9N2 virus had undergone an adaptive evolution and variation from 2011–2014.
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