ABSTRACT
ObjectiveThis work is aimed to investigate the possible association of dendritic cell immunoreceptor (DCIR) with rheumatoid arthritis (RA) susceptibility in Chinese Han population.Methods A total of 523 patients with RA and 510 healthy controls were genotyped for single-nucleotide polymorphism (SNP) rs2377422 and rs10840759.Association analyses were performed on the whole data set and on RA subsets based on the status of anti-cyclic citrullinated peptide antibody (CCP) in RA patients.Finally,we carried out the association analysis of rs2377422 with DCIR mRNA expression in RA patients.Statistical analysis used in this study included X2 test,Logistic regression,and Mann-Whitney U test.ResultsDCIR rs2377422 was found significantly associated with RA(allele analysis: OR 1.26; 95％CI 1.06～1.51,P=0.005; genotype analysis CC vs TT+TC: OR 1.34; 95％CI 1.18～2.06,P=0.004).Following stratification for anti-CCP antibody status,association of ra2377422 with anti-CCP-positive RA was observed(allele analysis: OR 1.22,95％CI 0.99～1.48,P=0.055).In contrast,the SNP rs2377422 was found specifically susceptible to anti-CCP-negative RA(allele analysis: OR 1.46; 95％CI 1.10～1.93,P=0.0091; genotype analysis CC vs TT+TC: OR 1.58;95％CI 1.01～2.47,P=0.043),despite loss of power in the analysis.DCIR gene transcription quantification analysis further proved the dominant effect of rs2480256 CC genotype on DCIR mRNA expression levels in RA patients (CC vs TT+TC: 0.429±0.069 vs 0.238±-0.023,U=1861,P=0.0015).ConclusionThe study provides evidence for the association between DCIR rs2377422 and RA,particularly with anti-CCP-negative RA in Chinese Han populations.