Ontology type: schema:ScholarlyArticle Open Access: True
2019-12-10
AUTHORSDavid Paez-Espino, Jinglie Zhou, Simon Roux, Stephen Nayfach, Georgios A. Pavlopoulos, Frederik Schulz, Katherine D. McMahon, David Walsh, Tanja Woyke, Natalia N. Ivanova, Emiley A. Eloe-Fadrosh, Susannah G. Tringe, Nikos C. Kyrpides
ABSTRACTBackgroundVirophages are small viruses with double-stranded DNA genomes that replicate along with giant viruses and co-infect eukaryotic cells. Due to the paucity of virophage reference genomes, a collective understanding of the global virophage diversity, distribution, and evolution is lacking.ResultsHere we screened a public collection of over 14,000 metagenomes using the virophage-specific major capsid protein (MCP) as “bait.” We identified 44,221 assembled virophage sequences, of which 328 represent high-quality (complete or near-complete) genomes from diverse habitats including the human gut, plant rhizosphere, and terrestrial subsurface. Comparative genomic analysis confirmed the presence of four core genes in a conserved block. We used these genes to establish a revised virophage classification including 27 clades with consistent genome length, gene content, and habitat distribution. Moreover, for eight high-quality virophage genomes, we computationally predicted putative eukaryotic virus hosts.ConclusionOverall, our approach has increased the number of known virophage genomes by 10-fold and revealed patterns of genome evolution and global virophage distribution. We anticipate that the expanded diversity presented here will provide the backbone for further virophage studies. More... »
PAGES157
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