Abstract
In the last 5 years, mutations in three genes, the cystic fibrosis transmembrane conductance regulator (CFTR) gene, the cationic trypsinogen (PRSS1) gene, and the pancreatic secretory trypsin inhibitor (PSTI) gene, have been found to be associated with chronic pancreatitis (CP). In this study, using established mutation screening methods, we systematically analysed the entire coding sequences and all exon/intron junctions of the three genes in 39 patients with idiopathic CP (ICP), with a view to evaluating the relative contribution of each gene to the aetiology of the disease. Our results demonstrate that, firstly, ‘gain-of-function’ mutations in the PRSS1 gene may occasionally be found in an obvious ICP subject. Secondly, presumably ‘loss-of-function’ mutations in the PSTI gene appear to be frequent, with a detection rate of at least 10% in ICP and, finally, abnormal CFTR alleles are common: at least 20% of patients carried one of the most common CFTR mutations, and about 10% of patients were compound heterozygotes, having at least one ‘mild’ allele. Thus, in total, about 30% of ICP patients carried at least one abnormal allele in one of the three genes, and this is the most conservative estimate. Moreover, a trans-heterozygous state with sequence variations in the PSTI/CFTR genes was found in three patients. However, an association between the 5T allele in intron 8 of the CFTR gene and ICP remains unproven.
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Acknowledgements
This study is dedicated to Claudine Verlingue. We thank all the patients who participated in this study and are grateful to JF Bretagne (Rennes), R Delcenserie (Amiens), C Faure (Paris), P Jonveaux (Nancy), and (Lyon) Lachaux A for sample contributions. This work was supported by the INSERM and the Projet Hospitalier de Recherche Clinique (PHRC).
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Audrézet, MP., Chen, JM., Le Maréchal, C. et al. Determination of the relative contribution of three genes–the cystic fibrosis transmembrane conductance regulator gene, the cationic trypsinogen gene, and the pancreatic secretory trypsin inhibitor gene–to the etiology of idiopathic chronic pancreatitis. Eur J Hum Genet 10, 100–106 (2002). https://doi.org/10.1038/sj.ejhg.5200786
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DOI: https://doi.org/10.1038/sj.ejhg.5200786
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