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© 1993 Oxford University Press

OTHER

Abnormal mRNA splicing resulting from three different mutations in the CFTR gene

Jeremy Hull*, Sue Shackleton and Ann Harris

Paediatric Molecular Genetics, Institute of Molecular Medicine, John Radcliffe Hospital Oxford OX3 9DU, UK

* To whom correspondence should be addressed

Received February 2, 1993; Revised March 24, 1993; Accepted March 24, 1993

Three different putative splicing mutations in the CFTR gene have been studied by analysing mRNA extracted from nasal epithelial cells harvested from patients with cystic fibrosis. Six patients were analysed, all of whom had classical symptoms of cystic fibrosis (CF). Two patients carried the 621+1G -> T mutation, 3 patients carried the 1717–1G -> A mutation and 1 patient carried the 1898+1G -> A mutation. All patients carried the {Delta}F508 mutation on the other chromosome. Ten non-CF control subjects were also studied. The 621+1G -> T mutation resulted in activation of an alternative splice site within exon 4 in one patient and activation of this site or skipping of exon 4 in the other patient. The 1717–1G -> A mutation resulted in skipping of exon 11 in all 3 patients studied and the 1898+1G -> T mutation resulted in skipping of exon 12. These experiments demonstrate that these mutations do result in aberrant splicing of CFTR mRNA as predicted from the changes in genomic sequence.


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