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Mol Cell Biol. 1993 September; 13(9): 5461-5468

Control of BEK and K-SAM splice sites in alternative splicing of the fibroblast growth factor receptor 2 pre-mRNA.

E Gilbert, F Del Gatto, P Champion-Arnaud, M C Gesnel and R Breathnach

INSERM U211, Institut de Biologie, Centre Hospitalier Régional de Nantes, France.

ABSTRACT

The fibroblast growth factor receptor 2 gene pre-mRNA can be spliced by using either the K-SAM exon or the BEK exon. The exon chosen has a profound influence on the ligand-binding specificity of the receptor obtained. Cells make a choice between the two alternative exons by controlling use of both exons. Using fibroblast growth factor receptor 2 minigenes, we have shown that in cells normally using the K-SAM exon, the BEK exon is not used efficiently even in the absence of the K-SAM exon. This is because these cells apparently express a titratable repressor of BEK exon use. In cells normally using the BEK exon, the K-SAM exon is not used efficiently even in the absence of a functional BEK exon. Three purines in the K-SAM polypyrimidine tract are at least in part responsible for this, as their mutation to pyrimidines leads to efficient use of the K-SAM exon, while mutating the BEK polypyrimidine tract to include these purines stops BEK exon use.

Mol Cell Biol. 1993 September; 13(9): 5461-5468




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