Permissive secondary mutations enable the evolution of influenza oseltamivir resistance.

Permissive secondary mutations enable the evolution of influenza oseltamivir resistance.
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DOI:
10.1126/science.1187816
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发表时间:
2010-06-04
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Baltimore D
Baltimore D
中科院分区:
其他
文献类型:
--
作者:
Bloom JD;Gong LI;Baltimore D

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His 274 → Tyr 274(H274 Y)突变赋予N1流感神经氨酸酶对奥司他韦的耐药性,但长期以来一直被认为会损害病毒适应性。然而,从2007-2008年开始,含有H274 Y的病毒迅速成为人类季节性H1N1分离株中的主要病毒。我们发现H274 Y减少了到达细胞表面的神经氨酸酶的量,并且这种缺陷可以通过也恢复病毒适应性的二次突变来抵消。在H274 Y广泛出现之前不久,季节性H1N1中发生了两次这样的突变。因此,奥司他韦耐药性的演变是通过“允许”突变实现的,这些突变允许病毒耐受随后出现的H274 Y。对这一过程的理解可能为预测其他流感病毒株对奥司他韦的耐药性演变提供基础。
The His274→Tyr274 (H274Y) mutation confers oseltamivir resistance on N1 influenza neuraminidase but had long been thought to compromise viral fitness. However, beginning in 2007–2008, viruses containing H274Y rapidly became predominant among human seasonal H1N1 isolates. We show that H274Y decreases the amount of neuraminidase that reaches the cell surface and that this defect can be counteracted by secondary mutations that also restore viral fitness. Two such mutations occurred in seasonal H1N1 shortly before the widespread appearance of H274Y. The evolution of oseltamivir resistance was therefore enabled by “permissive” mutations that allowed the virus to tolerate subsequent occurrences of H274Y. An understanding of this process may provide a basis for predicting the evolution of oseltamivir resistance in other influenza strains.
HIV-1 GAG中的簇突变是逃避HLA-B27限制的细胞毒性T淋巴细胞反应所必需的。
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