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Journal of Virology logoLink to Journal of Virology
. 1988 Feb;62(2):563–571. doi: 10.1128/jvi.62.2.563-571.1988

The late spliced 19S and 16S RNAs of simian virus 40 can be synthesized from a common pool of transcripts.

P J Good 1, R C Welch 1, W S Ryu 1, J E Mertz 1
PMCID: PMC250569  PMID: 2826816

Abstract

The late transcripts from the simian virus 40 (SV40) are alternatively spliced into two classes of spliced RNAs, 19S and 16S in size. We are interested in understanding the precursor-product relationships that result in the excision of different intervening sequences (introns) from the late transcripts. SV40 mutants containing precise deletions of the introns for each of the spliced 19S and 16S RNA species, including a previously undetected doubly spliced 19S RNA species, were isolated. Analysis by S1 mapping and a modified primer extension technique of the viral RNAs made in monkey cells transfected with each of these mutants led to the following conclusions. (i) Spliced late 19S RNA is not an intermediate in the synthesis of the late 16S RNAs. (ii) The 3' splice site used in the synthesis of the late 16S RNAs can join, albeit inefficiently, with alternative 5' splice sites in the absence of the 5' splice site normally used to synthesize 16S RNA. (iii) There is no obligatory order of excision of introns in the formation of the doubly spliced SV40 late 19S and 16S RNA species. A mutant was constructed by site-directed mutagenesis in which the 5'-proximal 3' splice site used in the synthesis of the doubly spliced RNAs is inactive. Cells transfected with this mutant processed transcripts into 19S RNA which, in wild-type-transfected cells, would have become doubly spliced 16S RNA. Therefore, we conclude that some of the spliced late 19S and 16S RNA can be synthesized from a common pool of transcripts.

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Selected References

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