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Objective.  The purpose is to investigate the role of kidney deficiency and the association between kidney deficiency and a polymorphism Fc γ RIIb 695T>C coding for nonsynonymous substitution IIe232Thr (I232T) in rheumatoid arthritis (RA).  Methods.  Clinical parameters and autoantibodies were analyzed and genotyping was performed in 159 kidney deficiency and 161 non-kidney-deficiency RA patients.  Results.  The age of disease onset and disease duration exhibited significant differences between two groups ( P  < 0.01). Patients with kidney deficiency tend to have higher activity of disease ( P  < 0.05). Anti-cyclic citrullinated peptides antibodies (ACPA) levels of patients with kidney deficiency were higher than the controls ( P  = 0.039). 125 (78.6%) kidney deficiency and 114 (70.8%) non-kidney-deficiency patients had both ACPA-positive and RF-positive ( P  = 0.04, OR = 3.29). Fc γ RIIb I232TT homozygotes were identified in 10 of 159 (6.3%) kidney deficiency subjects and 1 of 161 (0.6%) controls ( P  = 0.000, OR = 16.45). Furthermore, in pooled genotype analysis, I232IT and I232TT homozygotes were significantly enriched in kidney deficiency individuals compared with the controls ( P  = 0.000, OR = 3.79). Frequency of T allele was associated with kidney deficiency RA population ( P  = 0.000, OR = 3.18).  Conclusion.  This study confirmed that kidney deficiency was closely associated with disease activity and autoimmune disorder in RA. Kidney deficiency in RA is first to reveal a strong genetic link to Fc γ RIIb variants.

A Transmembrane Polymorphism of FcγReceptor IIb Is Associated with Kidney Deficiency Syndrome in Rheumatoid Arthritis