title: The MHC2TA -168A/G polymorphism and risk for rheumatoid arthritis: a meta-analysis of 6861 patients and 9270 controls reveals no evidence for association.
abstract: BACKGROUND
  An association between major histocompatibility complex (MHC) genes, particularly those within the class II HLA region, and rheumatoid arthritis (RA) is well established, and accounts for an estimated 30% of the genetic component in RA. The MHC class II transactivator gene (MHC2TA) on chromosome 16p13 has recently emerged as the most important transcription factor regulating genes required for class II MHC-restricted antigen presentation. Previous studies of a promoter region polymorphism (-168A/G, rs3087456) in the MHC2TA gene and RA have yielded conflicting results.
  
  
  OBJECTIVE
  To assess the association of the MHC2TA -168A/G polymorphism (rs3087456) and risk for RA by meta-analysis.
  
  
  METHODS
  Meta-analysis was performed for 6861 patients with RA and 9270 controls from 10 case-control studies. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated for each study. Summary ORs and 95% CIs were calculated for random effects models.
  
  
  RESULTS
  No effect was observed for the G risk allele (OR 1.02, 95% CI 0.93 to 1.12, p = 0.70) or the GG risk genotype (OR 1.14, 95% CI 0.95 to 1.36, p = 0.16).
  
  
  CONCLUSIONS
  Our results indicate that the MHC2TA -168A/G polymorphism (rs3087456) is not associated with RA yet underscore the importance of including shared epitope allele carrier status, secondary phenotypes and more complete characterisation of MHC2TA variation in future studies.
authors: Division of Epidemiology, School of Public Health, University of California, 209 Hildebrand Hall, Berkeley, CA 94720, USA.
authors: P G
authors: PG
authors: Bronson
authors: L A
authors: LA
authors: Criswell
authors: L F
authors: LF
authors: Barcellos
mesh_terms: D001172:Arthritis, Rheumatoid / Q000235:genetics*; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics*; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic / Q000235:genetics; D015534:Trans-Activators / Q000235:genetics*
chemical_list: C083728:MHC class II transactivator protein; D009687:Nuclear Proteins; D015534:Trans-Activators