Error thresholds and the constraints to RNA virus evolution.

Error thresholds and the constraints to RNA virus evolution.
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DOI:
10.1016/j.tim.2003.10.006
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发表时间:
2003-12
影响因子:
15.9
通讯作者:
Holmes EC
Holmes EC
中科院分区:
生物学1区
文献类型:
--
作者:
Holmes EC

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由于其极端的突变率,RNA病毒通常被认为具有几乎无限的适应性。然而,高突变率也通过建立错误阈值来限制病毒基因组的大小,超过这个阈值就会积累致命数量的有害突变。在此,我认为缺乏基因组空间意味着RNA病毒将受到重要的进化限制,因为特定的序列需要编码多个经常相互冲突的功能。这些限制的经验证据,以及它们如何限制病毒的适应性,现在开始积累起来。记录对RNA病毒进化的限制对于预测新病毒的出现和改进治疗程序具有重要的意义。
RNA viruses are often thought of as possessing almost limitless adaptability as a result of their extreme mutation rates. However, high mutation rates also put a cap on the size of the viral genome by establishing an error threshold, beyond which lethal numbers of deleterious mutations accumulate. Herein, I argue that a lack of genomic space means that RNA viruses will be subject to important evolutionary constraints because specific sequences are required to encode multiple and often conflicting functions. Empirical evidence for these constraints, and how they limit viral adaptability, is now beginning to accumulate. Documenting the constraints to RNA virus evolution has important implications for predicting the emergence of new viruses and for improving therapeutic procedures.
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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