Emerg Microbes Infect:上海季节性H3N2病毒的全基因组特征揭示了温度敏感株是由PA上I668V突变赋予的!

2018-11-17 ipsvirus 病毒学界

季节性H3N2流感病毒被认为是主要的流行病毒,在温带气候地区表现出复杂的季节性类型。为调查季节性流感的病毒进化和变异,研究者收集了上海2016-2017年62例H3N2感染病例的标本,并做了一个基因组分析。

近日,上海交通大学瑞金医学院的研究人员在Emerging Microbes & Infections杂志上发表了如下图的研究。



季节性H3N2流感病毒被认为是主要的流行病毒,在温带气候地区表现出复杂的季节性类型。为调查季节性流感的病毒进化和变异,研究者收集了上海2016-2017年62例H3N2感染病例的标本,并做了一个基因组分析。

甲型流感病毒所有八个部分的进化分析显示,有两种流行性感冒病毒在2016-2017年的冬季和2017年夏季流行。研究者还测量了这两种流行株在不同温度(33, 35, 37和39 °C)下的复制,并分析了温度敏感性的两种流行株的突变和病毒复制间的关联。复制动力学分析显示2016-2017年冬季流行株的复制在39 °C明显受到限制,与2017年夏季流行株相比。一个聚合酶活性实验和突变分析证明了2016-2017年冬季流行株PA (acidic polymerase)基因上I668V的突变抑制了高温时试管内实验的聚合酶活性。


图1 对流行于2016年11月-2017年9月HA和NA片段的进化分析

总之,这些数据表明2016-2017年冬季流行株的PA亚单位可以赋予病毒温度敏感性,并减弱病毒的复制和聚合酶活性。同时,2017年夏季流行株在高温时能保持毒力。这些发现强调了某些突变在病毒复制及随后季节里的持久性上的重要性。

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    2019-05-08 xjy02
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    2019-10-13 siiner
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