A PB1-K577E Mutation in H9N2 Influenza Virus Increases Polymerase Activity and Pathogenicity in Mice.

A PB1-K577E Mutation in H9N2 Influenza Virus Increases Polymerase Activity and Pathogenicity in Mice.
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DOI:
10.3390/v10110653
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发表时间:
2018-11-19
期刊:
Viruses
影响因子:
--
通讯作者:
Horimoto T
Horimoto T
中科院分区:
其他
文献类型:
--
作者:
Kamiki H;Matsugo H;Kobayashi T;Ishida H;Takenaka-Uema A;Murakami S;Horimoto T

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H9 N2禽流感病毒存在于世界各地的家禽中。这些病毒被认为具有大流行的潜力,因为最近的分离株可以识别人型受体,并且已经报告了几种散发的人类感染。在这项研究中,我们的目的是确定突变相关的哺乳动物适应H9 N2流感病毒。我们发现小鼠适应病毒在血凝素(HA)、PB 2、PA和PB 1中有几个突变。在检测到的突变中,PB 1-K577 E是一种新的突变,以前没有报道过与哺乳动物适应有关。仅携带PB 1-K577 E突变的重组H9 N2病毒在小鼠中显示出增强的致病性,与感染野生型病毒的小鼠相比,鼻甲中的病毒滴度增加。此外,PB 1-K577 E突变在较低温度下增加了人细胞培养物中的病毒聚合酶活性。这些数据表明,PB 1-K577 E突变是H9 N2病毒在小鼠中的一个新的致病性决定因素,可能是哺乳动物适应的一个标志。
H9N2 avian influenza viruses are present in poultry worldwide. These viruses are considered to have pandemic potential, because recent isolates can recognize human-type receptor and several sporadic human infections have been reported. In this study, we aimed to identify mutations related to mammalian adaptation of H9N2 influenza virus. We found that mouse-adapted viruses had several mutations in hemagglutinin (HA), PB2, PA, and PB1. Among the detected mutations, PB1-K577E was a novel mutation that had not been previously reported to involve mammalian adaptation. A recombinant H9N2 virus bearing only the PB1-K577E mutation showed enhanced pathogenicity in mice, with increased virus titers in nasal turbinates compared to that in mice infected with the wild-type virus. In addition, the PB1-K577E mutation increased virus polymerase activity in human cell culture at a lower temperature. These data suggest that the PB1-K577E mutation is a novel pathogenicity determinant of H9N2 virus in mice and could be a signature for mammalian adaptation.
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