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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1991 Dec 1;88(23):10647–10651. doi: 10.1073/pnas.88.23.10647

Evidence for common ancestry of a chestnut blight hypovirulence-associated double-stranded RNA and a group of positive-strand RNA plant viruses.

E V Koonin 1, G H Choi 1, D L Nuss 1, R Shapira 1, J C Carrington 1
PMCID: PMC52987  PMID: 1961731

Abstract

Computer-assisted analysis of the putative polypeptide products encoded by the two open reading frames present in a large virus-like double-stranded RNA, L-dsRNA, associated with hypovirulence of the chestnut blight fungus, Cryphonectria parasitica, revealed five distinct domains with significant sequence similarity to previously described conserved domains within plant potyvirus-encoded polyproteins. These included the putative RNA-dependent RNA polymerase, RNA helicase, two papain-like cysteine proteases related to the potyvirus helper-component protease, and a cysteine-rich domain of unknown function similar to the N-terminal portion of the potyvirus helper-component protein. Phylogenetic trees derived from the alignment of the polymerase domains of L-dsRNA, a subset of positive-stranded RNA viruses, and double-stranded RNA viruses, using three independent algorithms, suggested that the hypovirulence-associated dsRNA and potyvirus genomes share a common ancestry. However, comparison of the organization of the conserved domains within the encoded polyproteins of the respective viruses indicated that the proposed subsequent evolution involved extensive genome rearrangement.

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Selected References

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