Manrique Julieta M, Calvo Andrea Y, Jones Leandro R
Division of Molecular Biology, Estación de Fotobiología Playa Unión, CC 15 (9103), Playa Unión, Rawson, Chubut, Argentina.
Virus Genes. 2012 Oct;45(2):316-26. doi: 10.1007/s11262-012-0762-5. Epub 2012 Jun 7.
A phylogenetic analysis of new Ostreococcus virus (OV) sequences from the Patagonian Coast, Argentina, and homologous sequences from public databases was performed. This analysis showed that the Patagonian sequences represented a divergent viral clade and that the rest of OV sequences analyzed here were clustered into six additional phylogenetic groups. Analyses of 18S gene libraries supported a close relationship of the Patagonian Ostreococcus host with clade A sequences described elsewhere, corroborating previous studies indicating that clade A strains are ubiquitous. Besides the Patagonian OV sequences, several phylogenetic groupings were linked to particular geographic locations, suggesting a role for allopatric cladogenesis in viral diversification. However, and in agreement with previous observations, other viral lineages included sequences with diverse geographic origins. These findings, together with analyses of ancestral trait trajectories performed here, are consistent with an evolutionary dynamics in which geographical isolation has a role in OV diversification but can be followed by rapid dispersion to remote places.
对来自阿根廷巴塔哥尼亚海岸的新型奥氏球菌病毒（OV）序列以及公共数据库中的同源序列进行了系统发育分析。该分析表明，巴塔哥尼亚序列代表了一个不同的病毒分支，并且此处分析的其余OV序列被聚类为另外六个系统发育组。对18S基因文库的分析支持了巴塔哥尼亚奥氏球菌宿主与其他地方描述的A类序列的密切关系，证实了先前表明A类菌株无处不在的研究。除了巴塔哥尼亚OV序列外，几个系统发育分组与特定地理位置相关联，这表明异域物种形成在病毒多样化中发挥了作用。然而，并与先前的观察结果一致，其他病毒谱系包括具有不同地理起源的序列。这些发现，连同此处进行的祖先性状轨迹分析，与一种进化动态一致，即地理隔离在OV多样化中起作用，但随后可能会迅速扩散到偏远地区。
