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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Genomic characterization of a novel dsRNA virus detected in the phytopathogenic fungus Verticillium dahliae Kleb.
Virus Research 2011 July
Four novel double-stranded RNA segments were detected in a Verticillium dahliae Kleb. strain (V. dahliae isolate 0-21), a causal fungal agent of Verticillium wilt disease of cotton. Each dsRNA genome segment contains a single large open reading frame (ORF) that encodes a distinctive protein with modest levels of sequence similarities to the corresponding putative proteins in the genus Chrysovirus. These include an RNA-dependent RNA polymerase (RdRp), a coat protein, an undefined replication-related protein and an ovarian tumor domain peptidase. Phylogenetic analysis of the four putative proteins unanimously indicated that they are evolutionarily related to viruses in Chrysovirus. The 5'- and 3'-untranslated regions of the four dsRNAs share highly similar internal sequence and contain conserved sequence stretches of UGAUAAAAAA(/U)UG(/U)AAAAA- (in the 5'-UTR) and -UUUACUACU (in the 3'-UTR), indicating that they have a common virus origin. Indeed, isometric virus-like particles (VLPs) with a diameter of approximately 34nm were extracted from the fungal mycelia, and the four dsRNA segments were also detected in the virus-like particle (VLP) fraction. These results suggest that the mycovirus with four different dsRNA genome segments from the fungal isolate 0-21 is a new member of the genus Chrysovirus. We named the virus Verticillium dahliae chrysovirus 1 (VdCV1).
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