Phylogenetic analysis reveals the emergence, evolution and dispersal of carnivore parvoviruses.

Phylogenetic analysis reveals the emergence, evolution and dispersal of carnivore parvoviruses.
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DOI:
10.1099/vir.0.2008/002055-0
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发表时间:
2008-09
期刊:
The Journal of general virology
影响因子:
--
通讯作者:
Holmes EC
Holmes EC
中科院分区:
其他
文献类型:
--
作者:
Hoelzer K;Shackelton LA;Parrish CR;Holmes EC

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犬细小病毒(Canine parvovirus, CPV)于1978年首次被确认为一种新出现的犬类病毒,是由成功的跨物种传播引起的。CPV来自地方性猫泛白细胞减少病毒(FPV),或来自另一个宿主的密切相关的细小病毒。在此,我们完善了目前对FPV和CPV的进化和种群动态的理解。通过分析几乎全长的病毒序列,我们发现区分CPV和FPV的大部分替换都位于衣壳蛋白基因上,并且该基因在CPV中处于正选择状态,导致分子进化速度显著提高。这为病毒衣壳在宿主适应中的突出作用提供了强有力的系统发育证据。此外,对近期CPV种群动态的分析表明,在全球范围内,CPV种群具有强烈的空间细分,在国家之间几乎没有病毒流动,种群规模相对稳定。这种有限的病毒迁移与CPV大流行早期阶段观察到的病毒全球传播形成对比,但与当前CPV感染更具地方性的性质相对应。
Canine parvovirus (CPV), first recognized as an emerging virus of dogs in 1978, resulted from a successful cross-species transmission. CPV emerged from the endemic feline panleukopenia virus (FPV), or from a closely related parvovirus of another host. Here we refine our current understanding of the evolution and population dynamics of FPV and CPV. By analyzing nearly full-length viral sequences we show that the majority of substitutions distinguishing CPV from FPV are located in the capsid protein gene, and that this gene is under positive selection in CPV, resulting in a significantly elevated rate of molecular evolution. This provides strong phylogenetic evidence for a prominent role of the viral capsid in host adaptation. In addition, an analysis of the population dynamics of more recent CPV reveals, on a global scale, a strongly spatially subdivided CPV population with little viral movement among countries and a relatively constant population size. Such limited viral migration contrasts with the global spread of the virus observed during the early phase of the CPV pandemic, but corresponds to the more endemic nature of current CPV infections.
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