Nucleic Acids Research, 1985, Vol. 13, No. 15 5591-5609
© 1985
Articles |
Exon mutations that affect the choice of splice sites used in processing the SV40 late transcripts
McArdle Laboratory for Cancer Research, University of Wisconsin Madison, WI 53706, USA
Received April 9, 1985. Revised July 16, 1985. Accepted July 16, 1985.
The spliced species of late SV40 RNAs present in the cytoplasm of cells infected with various wild-type and mutant strains of SV40 that differ in their leader regions were determined using a novel modification of the primer extension method and the S1 nuclease mapping technique. These data indicated that mutations within the first exon of the late RNAs can affect dramatically the utilization of downstream donor and acceptor splice sites. In one instance, a ten base pair insertion within the predominant first exon increased utilization of an infrequently utilized donor splice site such that the small alteration became part of an intervening sequence, thereby suggesting a novel mechanism for regulation of gene expression. In addition, our method enabled detection of a previously unidentified spliced species, representing less than one percentof the SV40 late 19S RNA present in cells infected with wild–type virus, that may be an intermediate in the synthesis of a known doubly spliced 16S RNA species of SV40.
1Present address: Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA
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