P67L: a cystic fibrosis allele with mild effects found at high frequency in the Scottish population. |
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| Authors: | A Gilfillan J P Warner J M Kirk T Marshall A Greening L P Ho T Hargreave B Stack D McIntyre R Davidson J C Dean W Middleton and D J Brock |
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| Institution: | Human Genetics Unit, University of Edinburgh, Western General Hospital, UK. |
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| Abstract: | Only three mutant cystic fibrosis (CF) alleles have to date been established as conferring a dominant mild effect on affected subjects who are compound heterozygotes. We now add a fourth, P67L, which occurs on about 1.4% of Scottish CF chromosomes. Among 13 patients (12 unrelated) with this allele, the average age at diagnosis was 22.5 +/- 11.3 years. None of the cases had consistently raised sweat chloride concentrations, the average value being 57 +/- 9 mmol/l; 77% of the patients were pancreatic sufficient. When compared to three other established mild CF alleles, R117H, A455E, and 3849 + 10kb C-T, a compound heterozygote for P67L has minimal disease and clinical suspicions are unlikely to be confirmed other than by DNA typing. |
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