title: HLA-DRB1 genotypes and the risk of developing anti citrullinated protein antibody (ACPA) positive rheumatoid arthritis.
abstract: OBJECTIVE
  To provide a table indicating the risk for developing anti citrullinated protein antibody (ACPA) positive rheumatoid arthritis (RA) according to one's HLA-DRB1 genotype.
  
  
  METHODS
  We HLA-DRB1 genotyped 857 patients with ACPA positive RA and 2178 controls from South Eastern and Eastern France and calculated Odds Ratios (OR) for developing RA for 106 of 132 possible genotypes accounting for 97% of subjects.
  
  
  RESULTS
  HLA-DRB1 genotypic ORs for developing ACPA positive RA range from 28 to 0.19. HLA-DRB1 genotypes with HLA-DRB1*04SE (HLA-DRB1*0404, HLA-DRB1*0405, HLA-DRB1*0408), HLA-DRB1*04∶01, HLA-DRB1*01 are usually associated with high risk for developing RA. The second HLA-DRB1 allele in genotype somewhat modulates shared epitope associated risk. We did not identify any absolutely protective allele. Neither the Reviron, nor the du Montcel models accurately explains our data which are compatible with the shared epitope hypothesis and suggest a dosage effect among shared epitope positive HLA-DRB1 alleles, double dose genotypes carrying higher ORs than single dose genotypes.
  
  
  CONCLUSIONS
  HLA-DRB1 genotypic risk for developing ACPA positive RA is influenced by both HLA-DRB1 alleles in genotype. We provide an HLA-DRB1 genotypic risk table for ACPA positive RA.
authors.affiliation: Rhumatologie, Hôpital Sainte Marguerite, Assistance Publique Hôpitaux de Marseille, Marseille, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Balandraud
authors.forename: Christophe
authors.initials: C
authors.lastname: Picard
authors.forename: Denis
authors.initials: D
authors.lastname: Reviron
authors.forename: Cyril
authors.initials: C
authors.lastname: Landais
authors.forename: Eric
authors.initials: E
authors.lastname: Toussirot
authors.forename: Nathalie
authors.initials: N
authors.lastname: Lambert
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Telle
authors.forename: Caroline
authors.initials: C
authors.lastname: Charpin
authors.forename: Daniel
authors.initials: D
authors.lastname: Wendling
authors.forename: Etienne
authors.initials: E
authors.lastname: Pardoux
authors.forename: Isabelle
authors.initials: I
authors.lastname: Auger
authors.forename: Jean
authors.initials: J
authors.lastname: Roudier
mesh_terms: D000483:Alleles; D001172:Arthritis, Rheumatoid / Q000097:blood* / Q000235:genetics* / Q000276:immunology; D001323:Autoantibodies / Q000097:blood*; D016022:Case-Control Studies; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D059811:HLA-DRB1 Chains / Q000235:genetics*; D006801:Humans; D008297:Male; D012217:Rheumatoid Factor / Q000097:blood / Q000276:immunology
chemical_list: D001323:Autoantibodies; D059811:HLA-DRB1 Chains; D012217:Rheumatoid Factor