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. 1987 Feb;7(2):738–748. doi: 10.1128/mcb.7.2.738-748.1987

Factors influencing alternative splice site utilization in vivo.

X Y Fu, J L Manley
PMCID: PMC365130  PMID: 3029566

Abstract

To study factors that influence the choice of alternative pre-mRNA splicing pathways, we introduced plasmids expressing either wild-type or mutated simian virus 40 (SV40) early regions into tissue culture cells and then measured the quantities of small-t and large-T RNAs produced. One important element controlling splice site selection was found to be the size of the intron removed in the production of small-t mRNA; expansion of this intron (from 66 to 77 or more nucleotides) resulted in a substantial increase in the amount of small-t mRNA produced relative to large-T mRNA. This suggests that in the normal course of SV40 early pre-mRNA processing, large-T splicing is at a competitive advantage relative to small-t splicing because of the small size of the latter intron. Several additional features of the pre-mRNA that can influence splice site selection were also identified by analyzing the effects of mutations containing splice site duplications. These include the strengths of competing 5' splice sites and the relative positions of splice sites in the pre-mRNA. Finally, we showed that the ratio of small-t to large-T mRNA was 10 to 15-fold greater in human 293 cells than in HeLa cells or other mammalian cell types. These results suggest the existence of cell-specific trans-acting factors that can dramatically alter the pattern of splice site selection in a pre-mRNA.

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