title: The association of DRB1*04 share epitope alleles and tumor necrosis factor-alpha gene polymorphism (-863) with susceptibility to rheumatoid arthritis in Thai.
abstract: Rheumatoid arthritis (RA) in Thai population is significantly associated with HLA-DR4 shared epitope (SE) alleles, particularly with DRB1*0405 (P = 0.00004, OR = 3.84, 95% CI = 1.93, 7.7). In addition, tumor necrosis factor-alpha (TNF-alpha) gene -863A alleles were found to be significantly increased in 77 RA patients compared to 162 healthy controls (P = 0.03, OR = 1.73, 95% CI = 1.05, 2.87). Interestingly, TNF-863 AC and SE have a synergistic effect on the susceptibility to RA. The OR for the presence of both risk factors (DR4 SE and -863 AC) was cumulative: 15.4 (95% CI = 3.75, 73.6) while the separate OR of DR4 SE and -863 AC were 3.84 and 2.36, respectively. The TNF was not associated with the clinical manifestation and severity of Thai RA patients. However, a highly significant association was found between RF positivity, one marker for severity, and RA patients with DR4 SE (P = 0.0005, OR = 9.42, 95% CI = 2.26, 45.27).
authors.affiliation: Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand. fmednpt@md.chula.ac.th
authors.forename: N
authors.initials: N
authors.lastname: Hirankarn
authors.forename: J
authors.initials: J
authors.lastname: Nakkuntod
authors.forename: P
authors.initials: P
authors.lastname: Duangchalermwong
authors.forename: U
authors.initials: U
authors.lastname: Deesomchok
authors.forename: P
authors.initials: P
authors.lastname: Charoenwongse
mesh_terms: D000328:Adult; D000483:Alleles; D001172:Arthritis, Rheumatoid / Q000235:genetics*; D016022:Case-Control Studies; D000939:Epitopes / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D015804:HLA-DR4 Antigen / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D013785:Thailand; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
chemical_list: D000939:Epitopes; D015804:HLA-DR4 Antigen; D014409:Tumor Necrosis Factor-alpha