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Mol Cell Biol. 1992 May; 12(5): 2108-2114

Cooperation of pre-mRNA sequence elements in splice site selection.

Department of Pharmacology, University of North Carolina, Chapel Hill 27599-7295.

ABSTRACT

We have recently demonstrated that short internal exons in pre-mRNA transcripts with three exons and two introns are ignored by splicing machinery in vitro and in vivo, resulting in exon skipping. Exon skipping is reversed when the pyrimidine content of the polypyrimidine tract in the upstream intron is increased (Z. Dominski and R. Kole, Mol. Cell. Biol. 11:6075-6083, 1991). Here we show that skipping of the short internal exon can be partially reversed by mutations which modify the upstream branch point sequence of the 5' splice site at the end of the exon to their respective consensus sequences. When the modified elements are combined with one another in the same pre-mRNA, exon skipping is fully reversed. Full reversion of exon skipping is also observed when these elements are combined individually with the upstream polypyrimidine tract strengthened by three purine-to-pyrimidine mutations. The observed patterns of splice site selection are similar in vitro (in nuclear extracts from HeLa cells) and in vivo (in transfected HeLa cells). We also show that the length of the downstream intron plays a role in splice site selection. Our data indicate that the interplay between the sequence elements in pre-mRNA controls the outcome of each splicing event, providing the means for very subtle regulation of alternative splicing.

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