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• W2897579659 abstract "Abstract Viruses with RNA genomes dominate the eukaryotic virome, reaching enormous diversity in animals and plants. The recent advances of metaviromics prompted us to perform a detailed phylogenomic reconstruction of the evolution of the dramatically expanded global RNA virome. The only universal gene among RNA viruses is the RNA-dependent RNA polymerase (RdRp). We developed an iterative computational procedure that alternates the RdRp phylogenetic tree construction with refinement of the underlying multiple sequence alignments. The resulting tree encompasses 4,617 RNA virus RdRps and consists of 5 major branches, 2 of which include positive-sense RNA viruses, 1 is a mix of positive-sense (+) RNA and double-stranded (ds) RNA viruses, and 2 consist of dsRNA and negative-sense (−) RNA viruses, respectively. This tree topology implies that dsRNA viruses evolved from +RNA viruses on at least two independent occasions, whereas -RNA viruses evolved from dsRNA viruses. Reconstruction of RNA virus evolution using the RdRp tree as the scaffold suggests that the last common ancestors of the major branches of +RNA viruses encoded only the RdRp and a single jelly-roll capsid protein. Subsequent evolution involved independent capture of additional genes, particularly, those encoding distinct RNA helicases, enabling replication of larger RNA genomes and facilitating virus genome expression and virus-host interactions. Phylogenomic analysis reveals extensive gene module exchange among diverse viruses and horizontal virus transfer between distantly related hosts. Although the network of evolutionary relationships within the RNA virome is bound to further expand, the present results call for a thorough reevaluation of the RNA virus taxonomy. IMPORTANCE The majority of the diverse viruses infecting eukaryotes have RNA genomes, including numerous human, animal, and plant pathogens. Recent advances of metagenomics have led to the discovery of many new groups of RNA viruses in a wide range of hosts. These findings enable a far more complete reconstruction of the evolution of RNA viruses than what was attainable previously. This reconstruction reveals the relationships between different Baltimore Classes of viruses and indicates extensive transfer of viruses between distantly related hosts, such as plants and animals. These results call for a major revision of the existing taxonomy of RNA viruses." @default.
• W2897579659 created "2018-10-26" @default.
• W2897579659 creator A5004336477 @default.
• W2897579659 creator A5010775046 @default.
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• W2897579659 creator A5056062668 @default.
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• W2897579659 creator A5069355713 @default.
• W2897579659 creator A5071041670 @default.
• W2897579659 date "2018-10-24" @default.
• W2897579659 modified "2023-09-26" @default.
• W2897579659 title "Origins and Evolution of the Global RNA Virome" @default.
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