ArticleArchives of virology2025
Molecular characterization of a novel narnavirus from the plant-pathogenic fungus Ustilaginoidea virens.
Article in Archives of virology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
Funding
Abstract
Mycoviruses are viruses that infect fungi, yeasts, and oomycetes and can replicate and multiply within them. They are widely distributed in plant- and animal-pathogenic fungi. In this study, we identified a novel positive-sense single-stranded RNA (+ ssRNA) mycovirus from Ustilaginoidea virens strain Uv339, the causal agent of rice false smut (RSF), and this virus was named "Ustilaginoidea virens narnavirus 5" (UvNV5). Sequence analysis revealed that UvNV5 has a complete genome length of 2091 nt and contains a single open reading frame (ORF) (nt 131-2038) encoding a 635-amino-acid (aa) RNA-dependent RNA polymerase (RdRp) with a molecular mass of 71.8 kDa. BLASTp analysis revealed that the RdRp of UvNV5 shares only 38.22% amino acid sequence identity with that of Ustilaginoidea virens narnavirus virus 13, its closest relative. Phylogenetic analysis indicated that UvNV5 clustered within a branch alongside members of the class Amabiliviricetes. In summary, UvNV5 is a novel mycovirus of the class Amabiliviricetes that infects U. virens.
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