title: Antinuclear antibodies in early onset pauciarticular juvenile chronic arthritis (JCA) are associated with HLA-DQB1*0603: a possible JCA-associated human leucocyte antigen haplotype.
abstract: A panel of 43 early onset pauciarticular (EOPA) juvenile chronic arthritis (JCA) patients have been typed for human leucocyte antigens (HLA) DRB1, DPB1, DQA1 alleles, and DQB1*0603 status using molecular-based methods. Increased frequencies of DRB1*08 [odds ratio (OR) 7.7, 95% confidence interval (CI) 2.6-22.3], DRB1*11 (OR 3.1, 95% CI 1.2-8.1), DRB1*1301 (OR 7.7, 95% CI 2.6-22.3), DPB1*0201 (OR 3.5, 95% CI 1.6-8.0), DQA1*0103 (OR 4.4, 95% CI 1.5-13.3), DQA1*0501 (OR 2.9, 95% CI 1.3-6.6), DQA1*0601 (OR 30, 95% CI 3.6-241) and DQB1*0603 (OR 7.3, 95% CI 3.0-17.6) were found in the EOPA-JCA group compared with Caucasoid controls. Stratification of the EOPA-JCA group into antinuclear antibody (ANA) positive (n = 18) and ANA negative (n = 25) individuals revealed that ANA positivity was only associated with DRB1*1301 (OR 4.2, 95% CI 1.0-17.3), DPB1*0201 (OR 4.0, 95% CI 1.0-15.7) and DQB1*0603 (OR 11.5, 95% CI 2.5-53.4). Further analysis of the relative contributions of HLA antigens to ANA status revealed that DQB1*0603 determined the primary HLA effect. No apparent interaction between DQB1*0603 and DRB1*1301 or between DQB1*0603 and DPB1*0201 was found to contribute to the association with ANA. We suggest that those ANA positive individuals with a restricted HLA background, (DQB1*0603 positive), defines a group of EOPA-JCA patients which will be especially valuable in the characterization of the ANA associated with EOPA-JCA.
authors.affiliation: ARC Epidemiology Research Unit, University of Manchester.
authors.forename: R P
authors.initials: RP
authors.lastname: Donn
authors.forename: W
authors.initials: W
authors.lastname: Thomson
authors.forename: L
authors.initials: L
authors.lastname: Pepper
authors.forename: D
authors.initials: D
authors.lastname: Carthy
authors.forename: A
authors.initials: A
authors.lastname: Farhan
authors.forename: C
authors.initials: C
authors.lastname: Ryder
authors.forename: T
authors.initials: T
authors.lastname: Southwood
authors.forename: L
authors.initials: L
authors.lastname: Holt
authors.forename: W
authors.initials: W
authors.lastname: Ollier
mesh_terms: D017668:Age of Onset; D000974:Antibodies, Antinuclear / Q000097:blood*; D001171:Arthritis, Juvenile / Q000235:genetics / Q000276:immunology*; D001483:Base Sequence; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D006681:HLA-D Antigens / Q000097:blood; D006683:HLA-DQ Antigens / Q000097:blood*; D059866:HLA-DQ beta-Chains; D006801:Humans; D007223:Infant; D016015:Logistic Models; D008297:Male; D008969:Molecular Sequence Data; D016017:Odds Ratio
chemical_list: D000974:Antibodies, Antinuclear; D006681:HLA-D Antigens; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C069051:HLA-DQB1 antigen