High Diversity of the Viral Community from an Antarctic Lake
High Diversity of the Viral Community from an Antarctic Lake
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DOI：
10.1126/science.1179287
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发表时间：
2009-11-06
期刊：
影响因子：
56.9
通讯作者：
Alcami, Antonio
中科院分区：
文献类型：
--
作者：
Lopez-Bueno, Alberto;Tamames, Javier;Alcami, Antonio
病毒是最丰富的生物实体，可以控制微生物群落，但它们在南极陆地和淡水生态系统中的身份尚不清楚。南极湖病毒群落的遗传结构揭示了迄今为止在水生病毒宏基因组中发现的最高数量的病毒家族中分布的意想不到的遗传丰富性。与其他已知的以噬菌体序列为主的水生病毒组相比，这种南极病毒组合具有很大比例的与真核病毒相关的序列，包括先前在水生环境中未发现的藻DNA病毒和单链DNA（ssDNA）病毒。我们还观察到，从一个冰雪覆盖的湖泊在春天到一个开放水域的湖泊在夏天的转变导致了从ssDNA-双链DNA病毒为主的组合，可能反映了宿主生物的季节性变化。
Viruses are the most abundant biological entities and can control microbial communities, but their identity in terrestrial and freshwater Antarctic ecosystems is unknown. The genetic structure of an Antarctic lake viral community revealed unexpected genetic richness distributed across the highest number of viral families that have been found to date in aquatic viral metagenomes. In contrast to other known aquatic viromes, which are dominated by bacteriophage sequences, this Antarctic virus assemblage had a large proportion of sequences related to eukaryotic viruses, including phycodnaviruses and single-stranded DNA (ssDNA) viruses not previously identified in aquatic environments. We also observed that the transition from an ice-covered lake in spring to an open-water lake in summer led to a change from a ssDNA- to a double-stranded DNA-virus-dominated assemblage, possibly reflecting a seasonal shift in host organisms.