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. 1993 Jul;12(7):2969–2976. doi: 10.1002/j.1460-2075.1993.tb05959.x

Evolution and replication of tobacco ringspot virus satellite RNA mutants.

C Robaglia 1, G Bruening 1, J Haseloff 1, W L Gerlach 1
PMCID: PMC413552  PMID: 7687543

Abstract

The replication properties of linker insertion-deletion mutants of tobacco ringspot virus satellite RNA have been studied by amplification in plants infected with the helper virus. Sequence analysis of the cDNAs corresponding to the replicated forms shows that only one of the original mutated molecules replicates unaltered, and in general new variants accumulate. Depending on the location of the original mutation three types of sequence modifications were observed: (i) deletion of the mutated region followed by sequence duplication, (ii) sequence duplication and deletion outside of the mutated region and (iii) limited rearrangements at the site of mutation. The mutant that replicates without sequence changes accumulates linear multimeric forms suggesting that self-cleavage is affected although the sequence alteration does not involve the hammerhead catalytic domain. Alternative RNA conformations are likely to play a role in the origin of this phenotype and in the formation of sequence duplications. These results demonstrate the great structural flexibility of this satellite RNA.

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