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Intrahost Selection Pressures Drive Rapid Dengue Virus Microevolution in Acute Human Infections.
Cell Host & Microbe ( IF 20.6 ) Pub Date : 2017-09-13 , DOI: 10.1016/j.chom.2017.08.003
Poornima Parameswaran 1 , Chunling Wang 1 , Surbhi Bharat Trivedi 1 , Meghana Eswarappa 1 , Magelda Montoya 1 , Angel Balmaseda 2 , Eva Harris 1
Affiliation  

Dengue, caused by four dengue virus serotypes (DENV-1 to DENV-4), is a highly prevalent mosquito-borne viral disease in humans. Yet, selection pressures driving DENV microevolution within human hosts (intrahost) remain unknown. We employed a whole-genome segmented amplification approach coupled with deep sequencing to profile DENV-3 intrahost diversity in peripheral blood mononuclear cell (PBMC) and plasma samples from 77 dengue patients. DENV-3 intrahost diversity appears to be driven by immune pressures as well as replicative success in PBMCs and potentially other replication sites. Hotspots for intrahost variation were detected in 59%-78% of patients in the viral Envelope and pre-Membrane/Membrane proteins, which together form the virion surface. Dominant variants at the hotspots arose via convergent microevolution, appear to be immune-escape variants, and were evolutionarily constrained at the macro level due to viral replication defects. Dengue is thus an example of an acute infection in which selection pressures within infected individuals drive rapid intrahost virus microevolution.

中文翻译:

宿主内部的选择压力推动了急性人类感染中登革热病毒的快速微进化。

登革热是由四种登革热病毒血清型(DENV-1至DENV-4)引起的,是人类中由蚊子传播的高度流行的病毒性疾病。但是,驱动人类宿主(宿主内部)内DENV微进化的选择压力仍然未知。我们采用全基因组分段扩增方法,结合深度测序,分析了来自77名登革热患者的外周血单核细胞(PBMC)和血浆样品中的DENV-3宿主内部多样性。DENV-3宿主内部的多样性似乎是由免疫压力以及PBMC和潜在的其他复制位点的复制成功所驱动的。在病毒包膜和前膜/膜蛋白(共形成病毒体表面)中,有59%-78%的患者检测到宿主内部变异的热点。热点上的主要变异是通过收敛的微观进化而产生的,似乎是免疫逃逸变体,并且由于病毒复制缺陷而在宏观水平上受到进化限制。因此,登革热是急性感染的一个例子,其中受感染个体内的选择压力推动了宿主内病毒的快速微进化。
更新日期:2017-09-13
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