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. 1992 Mar 25;20(6):1201–1208. doi: 10.1093/nar/20.6.1201

Mutations which alter splicing in the human hypoxanthine-guanine phosphoribosyltransferase gene.

H Steingrimsdottir 1, G Rowley 1, G Dorado 1, J Cole 1, A R Lehmann 1
PMCID: PMC312159  PMID: 1373235

Abstract

A large proportion of mutations at the human hprt locus result in aberrant splicing of the hprt mRNA. We have been able to relate the mutation to the splicing abnormality in 30 of these mutants. Mutations at the splice acceptor sites of introns 4, 6 and 7 result in splicing out of the whole of the downstream exons, whereas in introns 1, 7 or 8 a cryptic site in the downstream exon can be used. Mutations in the donor site of introns 1 and 5 result in the utilisation of cryptic sites further downstream, whereas in the other introns, the upstream exons are spliced out. Our most unexpected findings were mutations in the middle of exons 3 and 8 which resulted in splicing out of these exons in part of the mRNA populations. Our results have enabled us to assess current models of mRNA splicing. They emphasize the importance of the polypyrimidine tract in splice acceptor sites, they support the role of the exon as the unit of assembly for splicing, and they are consistent with a model proposing a stem-loop structure for exon 8 in the hprt mRNA.

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Selected References

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