The sequences of the 3′-terminal 1.8 kb of the genomes of three Australian and three Welsh isolates of ryegrass mosaic rymovirus (RGMV) were determined, as too were the virion protein genes of two New Zealand isolates of RGMV. They were compared with each other and with the published sequences of a Danish and a South African isolate by distance and maximum likelihood methods, and found to be very closely related (mean nucleotide difference 5.5%). All three Australian isolates and one from North Island of New Zealand formed one consistent cluster, and the Danish and South African isolates formed another. However the relationships between these two clusters and the other isolates were not consistent; they depended on the method of comparison used, and on the protein, gene or codon position compared. Nonetheless the European (Welsh and Danish) sequences were 2–4 times more different from one another than those from the Antipodes, suggesting that the European RGMV population may be older than the Antipodean. The Danish isolate has 39 nucleotides of the 5′-terminal region of its virion protein gene frameshifted -1 relative to the ‘common’ sequence. Interestingly the South African isolate has a similar frameshift, but sequence comparisons indicate that this frameshift must have occurred independently; a possible example of ‘convergent frameshifting’.
Archives of Virology – Springer Journals
Published: Feb 1, 1999
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