Genetic interrelationships and genome organization of double-stranded RNA elements of Fusarium poae - PubMed (original) (raw)

Genetic interrelationships and genome organization of double-stranded RNA elements of Fusarium poae

P Compel et al. Virus Genes. 1999.

Abstract

The similar sized double-stranded RNA (dsRNA) elements present in vegetatively compatible strains of Fusarium poae were always genetically related, while vegetatively incompatible strains of the fungus contained either homologous or non-homologous dsRNAs of the same size. Electron microscopic observations revealed the co-existence of encapsidated and naked dsRNA elements in the same host. A mycovirus, named FUPO-1 was purified from strain A-11 and was found to contain two kinds of dsRNA segments, dsRNA 1 and dsRNA 2. The dsRNA genome of these segments was converted to cDNA clones by reverse transcription and the clones were subjected to sequence analysis. The single long open reading frame deduced from the sequence of dsRNA 1 showed similarities to the putative coat protein genes known from other mycoviruses, while conserved motifs of an RNA-dependent RNA polymerase were identified in the predicted amino acid sequence of dsRNA 2. The genome organization and certain sequence motifs of FUPO-1 show similarities to that of the Atkinsonella hypoxylon 2H virus and the FusoV mycovirus, members of the Partitiviridae family.

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