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Structurally distinct mitoviruses : are they an ancestral lineage of the Mitoviridae exclusive to arbuscular mycorrhizal fungi (Glomeromycotina)?

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Title: Structurally distinct mitoviruses : are they an ancestral lineage of the Mitoviridae exclusive to arbuscular mycorrhizal fungi (Glomeromycotina)?
Authors: Ezawa, Tatsuhiro Browse this author →KAKEN DB
Silvestri, Alessandro Browse this author
Maruyama, Hayato Browse this author →KAKEN DB
Tawaraya, Keitaro Browse this author
Suzuki, Mei Browse this author
Duan, Yu Browse this author
Turina, Massimo Browse this author
Lanfranco, Luisa Browse this author
Keywords: mycoviruses
plus-strand RNA virus
soil microbiology
Issue Date: 10-May-2023
Publisher: American Society for Microbiology
Journal Title: mBio
Volume: 14
Issue: 4
Start Page: e00240-23
Publisher DOI: 10.1128/mbio.00240-23
Abstract: Mitoviruses in the family Mitoviridae are the mitochondria-replicating “naked RNA viruses” with genomes encoding only the replicase RNA-dependent RNA polymerase (RdRp) and prevalent across fungi, plants, and invertebrates. Arbuscular mycorrhizal fungi in the subphylum Glomeromycotina are obligate plant symbionts that deliver water and nutrients to the host. We discovered distinct mitoviruses in glomeromycotinian fungi, namely “large duamitovirus,” encoding unusually large RdRp with a unique N-terminal motif that is endogenized in some host genomes. More than 400 viral sequences similar to the large duamitoviruses are present in metatranscriptome databases. They are globally distributed in soil ecosystems, consistent with the cosmopolitan distribution of glomeromycotinian fungi, and formed the most basal clade of the Mitoviridae in phylogenetic analysis. Given that glomeromycotinian fungi are the only confirmed hosts of these viruses, we propose the hypothesis that large duamitoviruses are the most ancestral lineage of the Mitoviridae that have been maintained exclusively in glomeromycotinian fungi.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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