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  • Title: Multiple virus infection in a single strain of Fusarium poae shown by deep sequencing.
    Author: Osaki H, Sasaki A, Nomiyama K, Tomioka K.
    Journal: Virus Genes; 2016 Dec; 52(6):835-847. PubMed ID: 27550368.
    Abstract:
    Many bands were detected on an electrophoretic profile of double-stranded (ds) RNA preparation from a single strain of Fusarium poae isolated from wheat. When the purified dsRNA sample was deep-sequenced by a next-generation sequencer, sixteen virus-like assembled contigs with predicted amino acid sequences showing homologies to respective viral RNA-dependent RNA polymerases (RdRps) were found by BLAST analysis. Fourteen out of sixteen sequences showed homologies to RdRps of known mycoviruses, that is, four mitoviruses, two narnaviruses, two partitiviruses, an alternavirus, a fusarivirus, a hypovirus, a victorivirus, and two unclassified mycoviruses, Sclerotinia sclerotiorum dsRNA mycovirus-L and Aspergillus foetidus slow virus 2, respectively. The other two putative viral RdRp sequences showed homologies to those of members of negative-stranded RNA viruses, the Ophiovirus and the Phlebovirus respectively, which mycoviruses had been not ever assigned to. Based on genome structure and phylogenetic analysis, both viruses were thought to be members of novel respective negative-stranded RNA virus groups. The presences of all sixteen viral RdRp sequences identified by BLAST analysis were confirmed by sequencing RT-PCR products generated from the starting dsRNA material using primers designed from the de novo assembled sequences of respective putative mycoviruses. Since the single strain of F. poae was considered to be multiply infected with mycoviruses from novel taxonomical groups in addition to many common mycoviruses, the RNA virome of the strain was found to be highly diverse.
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