Genome Sequence of Ostreococcus tauri Virus OtV-2 Throws Light on the Role of Picoeukaryote Niche Separation in the Ocean▿
| Autor: | Ilana C. Gilg, Michael J. Allen, William H. Wilson, Karen D. Weynberg, David J. Scanlan |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
food.ingredient
Genes Viral Sequence analysis Oceans and Seas Immunology Molecular Sequence Data Adaptation Biological Genome Viral Microbiology Genome Ostreococcus tauri Ostreococcus Evolution Molecular 03 medical and health sciences food Chlorophyta Virology Phycodnaviridae 14. Life underwater Gene 030304 developmental biology Genetics Ecological niche 0303 health sciences biology 030306 microbiology Sequence Analysis DNA Prasinovirus biology.organism_classification Genetic Diversity and Evolution Insect Science DNA Viral |
| Popis: | Ostreococcus tauri , a unicellular marine green alga, is the smallest known free-living eukaryote and is ubiquitous in the surface oceans. The ecological success of this organism has been attributed to distinct low- and high-light-adapted ecotypes existing in different niches at a range of depths in the ocean. Viruses have already been characterized that infect the high-light-adapted strains. Ostreococcus tauri virus (OtV) isolate OtV-2 is a large double-stranded DNA algal virus that infects a low-light-adapted strain of O. tauri and was assigned to the algal virus family Phycodnaviridae , genus Prasinovirus . Our working hypothesis for this study was that different viruses infecting high- versus low-light-adapted O. tauri strains would provide clues to propagation strategies that would give them selective advantages within their particular light niche. Sequence analysis of the 184,409-bp linear OtV-2 genome revealed a range of core functional genes exclusive to this low-light genotype and included a variety of unexpected genes, such as those encoding an RNA polymerase sigma factor, at least four DNA methyltransferases, a cytochrome b 5 , and a high-affinity phosphate transporter. It is clear that OtV-2 has acquired a range of potentially functional genes from its host, other eukaryotes, and even bacteria over evolutionary time. Such piecemeal accretion of genes is a trademark of large double-stranded DNA viruses that has allowed them to adapt their propagation strategies to keep up with host niche separation in the sunlit layers of the oceanic environment. |
| Databáze: | OpenAIRE |
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