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  • Title: Evidence for negative-strand RNA virus infection in fungi.
    Author: Kondo H, Chiba S, Toyoda K, Suzuki N.
    Journal: Virology; 2013 Jan 20; 435(2):201-9. PubMed ID: 23099204.
    Abstract:
    Fungal viruses comprise two groups: a major group of five families with double-stranded RNA genomes and a minor group with positive-sense single-stranded (ss)RNA genomes. Although many fungal viruses have been identified, no negative-stranded (-)ssRNA mycoviruses have been reported. Here we present two lines of evidence suggesting the presence of (-)ssRNA viruses in filamentous fungi based on an exhaustive search using extant (-)ssRNA viruses as queries. This revealed (-)ssRNA virus L protein-like sequences in the genome of a phytopathogenic obligate ascomycete, Erysiphe pisi. A similar search for (-)ssRNA viruses in fungal transcriptome shotgun assembly libraries demonstrated that two independent libraries from Sclerotinia homoeocarpa, another phytopathogenic ascomycete, contained several sequences considered to correspond to the entire mononegavirus L gene and likely originating from an infecting (-)ssRNA virus. These results provide strong evidence for both ancient and extant (-)ssRNA virus infections in fungi.
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