Circulating avian influenza viruses closely related to the 1918 virus have pandemic potential.

Circulating avian influenza viruses closely related to the 1918 virus have pandemic potential.
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DOI:
10.1016/j.chom.2014.05.006
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发表时间:
2014-06-11
影响因子:
30.3
通讯作者:
Kawaoka Y
Kawaoka Y
中科院分区:
医学1区
文献类型:
--
作者:
Watanabe T;Zhong G;Russell CA;Nakajima N;Hatta M;Hanson A;McBride R;Burke DF;Takahashi K;Fukuyama S;Tomita Y;Maher EA;Watanabe S;Imai M;Neumann G;Hasegawa H;Paulson JC;Smith DJ;Kawaoka Y

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野生鸟类拥有大量的甲型流感病毒基因库,这些病毒有可能导致流感大流行。预见和了解这种潜力对有效监测非常重要。我们的系统发育和地理分析揭示了全球流行的禽流感病毒基因,其蛋白质与1918年大流行性流感病毒仅相差几个氨基酸,这表明未来可能出现1918年样大流行性病毒。为了评估这种风险,我们产生并鉴定了一种由禽流感病毒片段组成的病毒,这种病毒与1918年的病毒具有高度同源性。该病毒在小鼠和雪貂中表现出比真正的禽流感病毒更高的致病性。此外,在病毒聚合酶和血凝素表面糖蛋白中获得7个氨基酸替换,使呼吸道飞沫传播给雪貂中的1918样禽流感病毒,这表明具有1918样病毒蛋白的当代禽流感病毒可能具有大流行的潜力。
Wild birds harbor a large gene pool of influenza A viruses that have the potential to cause influenza pandemics. Foreseeing and understanding this potential is important for effective surveillance. Our phylogenetic and geographic analyses revealed the global prevalence of avian influenza virus genes whose proteins differ only a few amino acids from the 1918 pandemic influenza virus, suggesting that 1918-like pandemic viruses may emerge in the future. To assess this risk, we generated and characterized a virus composed of avian influenza viral segments with high homology to the 1918 virus. This virus exhibited higher pathogenicity in mice and ferrets than an authentic avian influenza virus. Further, acquisition of seven amino acid substitutions in the viral polymerases and the hemagglutinin surface glycoprotein conferred respiratory droplet transmission to the 1918-like avian virus in ferrets, demonstrating that contemporary avian influenza viruses with 1918 virus-like proteins may have pandemic potential.
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