Mutations in PA, NP, and HA of a pandemic (H1N1) 2009 influenza virus contribute to its adaptation to mice.

Mutations in PA, NP, and HA of a pandemic (H1N1) 2009 influenza virus contribute to its adaptation to mice.
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DOI:
10.1016/j.virusres.2011.03.022
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发表时间:
2011-06
期刊:
影响因子:
5
通讯作者:
Kawaoka Y
Kawaoka Y
中科院分区:
医学3区
文献类型:
--
作者:
Sakabe S;Ozawa M;Takano R;Iwastuki-Horimoto K;Kawaoka Y

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2009年,猪源性H1N1流感病毒引发了21世纪的第一次大流行。为了了解大流行性流感病毒对新宿主物种适应的分子基础,我们在小鼠肺中连续传代了2009年H1N1大流行性流感病毒株A/California/04/09。经过十次传代,病毒对老鼠是致命的。我们发现野生型和小鼠适应型病毒之间有8个氨基酸差异:1个在PB1, 3个在PA, 3个在HA, 1个在NP。通过反向遗传产生突变病毒,我们确定PA(位置21和616)、HA(位置127和222)和NP(位置375)的氨基酸替换在小鼠致病性增加中起独立作用。在这5个替换中,在透明质酸127位的天冬氨酸到谷氨酸的替换有助于在小鼠肺中有效地复制病毒。我们的结果表明病毒聚合酶复合物和HA在病毒适应新宿主中的重要性。
In 2009, a swine-origin H1N1 influenza virus caused the first pandemic of the 21st century. To understand the molecular basis of pandemic influenza virus adaptation to new host species, we serially passaged the pandemic (H1N1) 2009 virus strain A/California/04/09 in mouse lungs. After ten passages, the virus became lethal to mice. We found eight amino acid differences between the wild-type and mouse-adapted viruses: one in PB1, three in PA, three in HA, and one in NP. By using reverse genetics to generate mutant viruses, we determined that the amino acid substitutions in PA (at positions 21 and 616), HA (at positions 127 and 222), and NP (at position 375) play independent roles in the increased pathogenicity in mice. Among these five substitutions, an aspartic acid-to-glutamic acid substitution at position 127 in HA contributed to efficient viral replication in mouse lungs. Our results suggest the importance of the viral polymerase complex and of HA in viral adaption to a new host.
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