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Variation in the hypervariable region of cucumber mosaic virus satellite RNAs is affected by the helper virus and the initial sequence context

Variation in the hypervariable region of cucumber mosaic virus satellite RNAs is affected by the helper virus and the initial sequence context

Virology 206(1): 765-768

ISSN/ISBN: 0042-6822

PMID: 7530401

DOI: 10.1016/s0042-6822(95)80006-9

The D satellite RNA (sat RNA) of cucumber mosaic virus (CMV) was previously shown to contain a region of hypervariability around nucleotide 230, in wild-type populations and in cDNA clones and progeny of one such clone (pDsat4) after passage with the subgroup I strain Fny-CMV. This hypervariable region (HVR) consists of a series of consecutive A and/or U residues. We found that variability is also generated in the HVR of transcript derived from pDsat4 after passage with the subgroup II strain LS-CMV and with tomato aspermy virus (TAV). However, the progeny differ with respect to the sequence of the HVR after passage with both LS-CMV and TAV. Another D-sat RNA cDNA clone that contains a C residue in the HVR, pDsatl, was previously shown not to develop variability in the HVR upon passage with Fny-CMV. However, when the C (position 231) was changed to an A residue, variability developed by the third passage with Fny-CMV. An additional cDNA clone derived from the B1-sat RNA, pBsat5, also contains a C residue in the region analogous to the D-sat RNA HVR and did not develop variability upon passage with either Fny- or LS-CMV. Changing this C to a U residue did not result in the development of hypervariability in the progeny of transcript from this mutant. Models to explain the generation of hypervariability are discussed.

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