J Virol:英国科学家发现H7N9亚型流感病毒调控HA糖蛋白抗原性的关键位点

2018-10-17 Etrgh 病毒学界

禽流感病毒由于能够不断进化和获得突变,而促使病毒发生抗原漂移及毒力改变。在2017年,中国就出现了低致病性的H7N9禽流感病毒进化为高致病性禽流感病毒的情况,对其两者进行抗原分析发现,高致病性病毒的抗原发生了显着变化。

禽流感病毒由于能够不断进化和获得突变,而促使病毒发生抗原漂移及毒力改变。在2017年,中国就出现了低致病性的H7N9禽流感病毒进化为高致病性禽流感病毒的情况,对其两者进行抗原分析发现,高致病性病毒的抗原发生了显着变化。近日,来自英国的科学家们在《Journal of Virology》杂志发表了一篇题为“Amino acid residue 217 in the hemagglutinin glycoprotein is a keymediator of avian influenza H7N9 virus antigenicity”的文章,该研究成果揭示了调控H7N9禽流感病毒HA糖蛋白抗原性的关键位点。

研究人员通过使用与同源的H7N9亚型禽流感病毒抗体血清与病毒作用后,进行病毒的传代培养。对能够抵抗抗体中和作用的流感病毒进行测序,发现在传代培养5代次之后,病毒的HA基因出现了A125T、A151T 和L217Q位点的突变,且位点的突变能持续至第10代次。进一步研究发现,出现HA基因L217Q位点的突变的毒株血凝抑制的滴度显着降低,表明该位点的突变是导致H7N9亚型禽流感病毒抗原发生多样化的重要位点。



这一研究成果说明,H7N9亚型禽流感病毒HA基因的217位点可以作为病毒抗原多样性的遗传标记并用于疫苗种毒的筛选,同时,该研究为更好地预防和控制流感病毒的传播提供了新的切入点。

原始出处:Chang P, Sealy JE, Sadeyen JR, Iqbal M. Amino acid residue 217 in the hemagglutinin glycoprotein is a key mediator of avian influenza H7N9 virus antigenicity. J Virol. 2018 Oct 3. 

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    2018-10-19 kafei

    了解一下谢谢

    0

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