title: Cystic fibrosis gene mutations and gastrointestinal diseases.
abstract: BACKGROUND
  This study examined if CF mutation heterozygosity is associated with diseases of gastrointestinal epithelial barrier function.
  
  
  METHODS
  Swedish registers identified 865 patients with a diagnosis of CF between 1968 and 2003 and matched with 8101 individuals without CF. Gastrointestinal disease risk was examined among 1534 biological parents and 1396 siblings of CF patients, compared with 15,526 parents and 15,542 siblings of individuals without CF.
  
  
  RESULTS
  First-degree relatives of CF patients were not at lower risk of the gastrointestinal diseases, in contrast with a raised risk among CF patients.
  
  
  CONCLUSIONS
  Heterozygosity for CF gene mutations does not protect against gastrointestinal diseases where impaired barrier function may be relevant.
authors.affiliation: Clinical Epidemiology Unit, Department of Medicine, Karolinska Hospital, Stockholm, Sweden. Shahram.Bahmanyar@ki.se
authors.forename: Shahram
authors.initials: S
authors.lastname: Bahmanyar
authors.forename: Anders
authors.initials: A
authors.lastname: Ekbom
authors.forename: Johan
authors.initials: J
authors.lastname: Askling
authors.forename: Marie
authors.initials: M
authors.lastname: Johannesson
authors.forename: Scott M
authors.initials: SM
authors.lastname: Montgomery
mesh_terms: D016022:Case-Control Studies; D003550:Cystic Fibrosis / Q000235:genetics*; D005260:Female; D005767:Gastrointestinal Diseases / Q000235:genetics*; D006579:Heterozygote; D006801:Humans; D008297:Male; D010290:Parents; D016016:Proportional Hazards Models; D012042:Registries; D012306:Risk; D035781:Siblings; D013548:Sweden