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- W1963780215 abstract "The genetic variability and evolution of the satellite RNA (satRNA) of cucumber mosaic virus (CMV) was analyzed. Twenty-five CMV-satRNAs compared clustered into three main groups, and no correlation was found between genetic proximity and other characteristics (pathogenicity, geographical origin) of the satRNAs. Values for the number of nucleotide substitutions per site between any two satRNAs suggest that divergence is checked by functional constraints. The analysis of mutations relative to an ancestral sequence, and the number of substitutions per site at first, second and third positions of codons in putative open reading frames, show that the variation of CMV-satRNAs does not follow a pattern typical of coding sequences, and indicates that preservation of the sequence of encoded products is not a constraint to evolution. On the other hand, when the observed variation was analyzed relative to a secondary structure model proposed for CMV-satRNAs, several lines of evidence indicated that the maintenance of the secondary structure is a constraint to evolution: the number of substitutions per site, the number of point insertions and deletions and the number of base substitutions that would disrupt base-pairing were significantly higher for unpaired than for base-paired positions. Also, compensatory mutations at base-paired positions occurred more frequently than expected from random. The results suggest that CMV-satRNAs are non-coding, functional RNAs whose biology would be determined by their direct interaction with components of the host and/or the helper virus." @default.
- W1963780215 created "2016-06-24" @default.
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- W1963780215 date "1991-10-01" @default.
- W1963780215 modified "2023-10-18" @default.
- W1963780215 title "Secondary structure as a constraint on the evolution of a plant viral satellite RNA" @default.
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- W1963780215 doi "https://doi.org/10.1016/0022-2836(91)90916-t" @default.
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