Natural attenuation of dengue virus type-2 after a series of island outbreaks: a retrospective phylogenetic study of events in the South Pacific three decades ago.

Natural attenuation of dengue virus type-2 after a series of island outbreaks: a retrospective phylogenetic study of events in the South Pacific three decades ago.
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DOI:
10.1016/j.virol.2010.05.033
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发表时间:
2010-09-30
期刊:
影响因子:
3.7
通讯作者:
Bennett SN
Bennett SN
中科院分区:
医学3区
文献类型:
--
作者:
Steel A;Gubler DJ;Bennett SN

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登革热是一种严重程度不同的扩大性虫媒病毒疾病,其特征是出现了适应性更强、流行潜力更大和可能毒力更强的病毒株。为了研究登革病毒(DENV)毒株变异对流行活动的作用,我们研究了来自一系列南太平洋岛屿的DENV-2病毒,这些岛屿经历了不同强度和临床严重程度的暴发。该病毒最初于1971年在塔希提岛和斐济出现,随后于1972年在美属萨摩亚、新喀里多尼亚和纽埃岛流行,1973年到达汤加,在那里有一年多的时间几乎没有传播。基于对20个病毒分离株的全基因组测序和系统发育分析,汤加病毒在遗传上是独特的,聚集在一个分支中。前膜(prM)和非结构基因NS 2A和NS 4A的替换与汤加病毒的减毒相关,并表明遗传变化可能在登革热流行的严重程度中发挥重要作用。
Dengue is an expanding arboviral disease of variable severity characterized by the emergence of virus strains with greater fitness, epidemic potential and possibly virulence. To investigate the role of dengue virus (DENV) strain variation on epidemic activity we studied DENV-2 viruses from a series of South Pacific islands experiencing outbreaks of varying intensity and clinical severity. Initially appearing in 1971 in Tahiti and Fiji, the virus was responsible for subsequent epidemics in American Samoa, New Caledonia and Niue Island in 1972, reaching Tonga in 1973 where there was near-silent transmission for over a year. Based on whole-genome sequencing and phylogenetic analysis on 20 virus isolates, Tonga viruses were genetically unique, clustering in a single clade. Substitutions in the pre-membrane (prM) and nonstructural genes NS2A and NS4A correlated with the attenuation of the Tongan viruses and suggest that genetic change may play a significant role in dengue epidemic severity.
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