Identification of intron and exon sequences involved in alternative splicing of insulin receptor pre-mRNA.

The Journal of Biological Chemistry
A KosakiNicholas J G Webster

Abstract

The insulin receptor exists as two isoforms, A and B, that result from alternative splicing of exon 11 in the primary transcript. We have shown previously that the alternative splicing is developmentally and hormonally regulated. Consequently, these studies were instigated to identify sequences within the primary RNA transcript that regulate the alternative splicing. Minigenes containing exons 10, 11, and 12 and the intervening introns were constructed and transfected into HepG2 cells, which contain both isoforms of the insulin receptor. The cells were able to splice the minigene transcript to give both A (- exon 11) and B-like (+ exon 11) RNAs. A series of internal deletions within intron 10 were tested for their ability to give A and B RNAs. Intron 10 contained two sequences that modulated exon 11 inclusion; a 48-nucleotide purine-rich sequence at the 5' end of intron 10 that functions as a splicing enhancer and causes an increase in exon 11 inclusion, and a 43-nucleotide sequence at the 3' end of intron 10 upstream of the branch point sequence that favors skipping of exon 11. Increasing the length of the polypyrimidine tract at the 3' end of intron 10 caused exon 11 to be spliced constitutively, indicating that a weak splice...Continue Reading

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