title: Lack of association between juvenile idiopathic arthritis and fas gene polymorphism.
abstract: OBJECTIVE
  Juvenile idiopathic arthritis (JIA) is a complex genetic disease of autoimmune etiology. Fas is a molecule with a pivotal role in apoptosis and hence in immune regulation. Elevated transcriptional levels of Fas in the synovial fluid of patients with JIA suggest that it might be implicated in disease etiopathogenesis. We investigated whether a polymorphism in the Fas promoter region (-670) confers susceptibility to JIA.
  
  
  METHODS
  In this association study, 342 UK patients with JIA and 255 healthy individuals were genotyped for the polymorphism using polymerase chain reaction restriction fragment length polymorphism. Comparisons of the genotypic frequencies were made using chi-square analysis.
  
  
  RESULTS
  No statistically significant differences were found when the genotype frequencies of the -670 Fas polymorphism were compared between the JIA cases and the control panel. Similarly, no differences were seen between the JIA subgroups, or when the patients were divided on the basis of rheumatoid factor or antinuclear antibody positivity.
  
  
  CONCLUSIONS
  The -670 polymorphism of Fas does not appear to be associated with susceptibility to JIA.
authors.affiliation: ARC Epidemiology Unit, University of Manchester, UK.
authors.forename: Rachelle
authors.initials: R
authors.lastname: Donn
authors.forename: Eleftheria
authors.initials: E
authors.lastname: Zeggini
authors.forename: Emma
authors.initials: E
authors.lastname: Shelley
authors.forename: William
authors.initials: W
authors.lastname: Ollier
authors.forename: Wendy
authors.initials: W
authors.lastname: Thomson
mesh_terms: D017209:Apoptosis / Q000235:genetics*; D001171:Arthritis, Juvenile / Q000235:genetics* / Q000378:metabolism / Q000503:physiopathology; D002648:Child; D004252:DNA Mutational Analysis; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005820:Genetic Testing; D005838:Genotype; D006801:Humans; D007596:Joints / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D009154:Mutation / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics*; D012217:Rheumatoid Factor / Q000235:genetics / Q000378:metabolism; D019014:fas Receptor / Q000235:genetics*
chemical_list: D019014:fas Receptor; D012217:Rheumatoid Factor