title: Mutations of the cystic fibrosis gene, but not cationic trypsinogen gene, are associated with recurrent or chronic idiopathic pancreatitis.
abstract: OBJECTIVE
  We investigated whether mutations of the cystic fibrosis transmembrane conductance regulator (CFTR) gene and cationic trypsinogen gene are associated with recurrent acute, or chronic idiopathic pancreatitis.
  
  
  METHODS
  Twenty patients with idiopathic pancreatitis (11 women, nine men; mean age, 30 yr) were studied for the presence of a CFTR mutation by screening the genomic DNA for more than 30 mutations and variants in the CFTR gene. Selected mutations of the cationic trypsinogen gene were screened by Afl III restriction digestion or by a mutation-specific polymerase chain reaction (PCR). In each patient exons 1, 2, and 3 of the cationic trypsinogen gene were sequenced. Patients with a CFTR mutation underwent evaluation of further functional electrophysiological test (intestinal current measurement).
  
  
  RESULTS
  No mutation of the cationic trypsinogen gene was detected. A CFTR mutation was detected in 6/20 (30.0%) patients. Three patients (15.0%) had a cystic fibrosis (CF) mutation on one chromosome (deltaF508, I336K, Y1092X), which is known to cause phenotypical severe cystic fibrosis. One patient was heterozygous for the 5T allele. In addition, two possibly predisposing CFTR variants (R75Q, 1716G-->A) were detected on four patients, one of these being a compound heterozygous for the missense mutation I336K and R75Q. No other family member (maternal I336K; paternal R75Q; sister I1336K) developed pancreatitis. An intestinal current measurement in rectum samples of patients with a CFTR mutation revealed no CF-typical constellations.
  
  
  CONCLUSIONS
  CFTR mutations are associated with recurrent acute, or chronic idiopathic pancreatitis, whereas mutations of the cationic trypsinogen mutation do not appear to be a frequent pathogenetic factor.
authors.affiliation: Department of Gastroenterology and Hepatology, Human Genetics, Paediatric Pulmonology, Medical School of Hannover, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Ockenga
authors.forename: M
authors.initials: M
authors.lastname: Stuhrmann
authors.forename: M
authors.initials: M
authors.lastname: Ballmann
authors.forename: N
authors.initials: N
authors.lastname: Teich
authors.forename: V
authors.initials: V
authors.lastname: Keim
authors.forename: T
authors.initials: T
authors.lastname: Dörk
authors.forename: M P
authors.initials: MP
authors.lastname: Manns
mesh_terms: D000328:Adult; D002908:Chronic Disease; D003550:Cystic Fibrosis / Q000235:genetics*; D004594:Electrophysiology; D005260:Female; D005820:Genetic Testing; D006801:Humans; D008297:Male; D009154:Mutation / Q000235:genetics / Q000502:physiology*; D010195:Pancreatitis / Q000235:genetics* / Q000503:physiopathology; D010375:Pedigree; D012008:Recurrence