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病毒适合度的研究进展

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摘要   RNA病毒是一种普遍存在的细胞生物,几乎可以在所有生命体中找到.由于RNA聚合酶和逆转录酶缺乏严密的自我校正功能,因而具有高突变率,即使最新克隆出的病毒种群(Populations),也可能是由一个或多个位点不同、但基因组相近的病毒所组成的混合群体[1].RNA病毒由于种群高度地异质性,形成由相关基因组构成的动态突变种群就叫作病毒准种(Quasispecies).正是由于病毒准种的存在,使得病毒种群能够在选择压力下生存.任何促进传染新宿主的疾病特性均可成为病原体正向进化选择压力的主体,当一种或一系列更适合在改变的环境中复制生存的突变产生后,病毒种群的适合度(Viral fitness)就增加了,流行也更加迅速了.……
出处 《重庆医科大学学报》 CAS CSCD 2007年第z1期140-142,145,共4页 Journal of Chongqing Medical University
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