Lack of Association of Common Cystic Fibrosis Transmembrane Conductance Regulator Gene Mutations with Primary Sclerosing Cholangitis

Gallegos-Orozco, Juan F.; E. Yurk, Catherine; Wang, Nulang; Rakela, Jorge; Charlton, Michael R.; Cutting, Garry R.; Balan, Vijayan
April 2005
American Journal of Gastroenterology;Apr2005, Vol. 100 Issue 4, p874
Academic Journal
BACKGROUND: Primary sclerosing cholangitis (PSC) is a chronic progressive cholestatic liver disease of uncertain etiology. However, the histologic features of PSC liver disease can resemble those in cystic fibrosis (CF), an inherited disorder caused by mutations in the CF transmembrane conductance regulator (CFTR) gene. We sought to determine if PSC patients have a higher frequency of common CF alleles than disease controls.METHODS: DNA was extracted from peripheral lymphocytes of patients with end-stage liver disease. Samples were obtained before liver transplantation from 59 PSC patients and from three groups of control patients (20 each with primary biliary cirrhosis, autoimmune hepatitis, or hepatitis C). DNA samples were genotyped for 32 common CF mutations, the intron 8 T tract variants, and the M470V variant.RESULTS: One of 59 PSC patients (1.7%) had the common CF mutation (ΔF508) in oneCFTRgene. Two controls (3.3%) carried a single CF mutation (ΔF508 in one primary biliary cirrhosis patient; W1282X in one hepatitis C patient). These rates do not differ from expected in the general population. The frequency ofCFTRvariants (5T and M470V) was also similar between PSC patients and controls.CONCLUSIONS: Despite anatomical similarities between CF liver disease and PSC, we could not confirm that PSC patients carried common CF mutations or commonCFTRvariants in higher than expected frequencies. These data suggest thatCFTRdysfunction does not influence the pathogenesis of PSC.(Am J Gastroenterol 2005;100:874–878)


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