title: Low copy numbers of FCGR3A and FCGR3B associated with Chinese patients with SLE and AASV.
abstract: Low-affinity Fcγ receptors (FcγR) act as key mediators of the pathogenic effects of autoantibodies. In this study, we aimed to determine whether copy number variations (CNVs) in FCGR3A and FCGR3B were associated with systemic lupus nephritis (SLE) and ANCA-associated systemic vasculitis (AASV) in Chinese individuals. A total of 1118 individuals were enrolled, including 415 SLE patients, 139 AASV patients, and 564 healthy controls. FCGR3A and FCGR3B copy numbers (CNs) were determined by both a paralogue ratio test and TaqMan quantitative PCR assay. In the susceptibility associations, a low FCGR3B CN was significantly associated with SLE ( p = 5.01 × 10-3; odds ratio (OR) 1.71; 95% confidence interval (CI) 1.17-2.48) and AASV ( p = 0.04; OR = 1.72; 95% CI 1.02-2.88). A low FCGR3A CN was also significantly associated with SLE ( p = 6.02 × 10-3; OR 2.72; 95% CI 1.30-5.71) and AASV ( p = 0.042; OR 2.64; 95% CI 1.00-6.93). Further subphenotype analysis revealed that low CNs of FCGR3A and FCGR3B were significantly associated with clinical manifestations in SLE and AASV patients. Therefore, in this case-control study, we identified low CNs of FCGR2A and FCGR3B to be common risk factors for SLE and AASV.
authors.affiliation: 1 Renal Division, Peking University First Hospital, People's Republic of China.|2 Peking University Institute of Nephrology, People's Republic of China.|3 Key Laboratory of Renal Disease, Ministry of Health of China, People's Republic of China.|4 Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Qi
authors.affiliation: 1 Renal Division, Peking University First Hospital, People's Republic of China.|2 Peking University Institute of Nephrology, People's Republic of China.|3 Key Laboratory of Renal Disease, Ministry of Health of China, People's Republic of China.|4 Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, People's Republic of China.
authors.forename: X
authors.initials: X
authors.lastname: Zhou
authors.affiliation: 5 Research Central Institute, Peking University First Hospital, Beijing, People's Republic of China.
authors.forename: D
authors.initials: D
authors.lastname: Bu
authors.affiliation: 1 Renal Division, Peking University First Hospital, People's Republic of China.|2 Peking University Institute of Nephrology, People's Republic of China.|3 Key Laboratory of Renal Disease, Ministry of Health of China, People's Republic of China.|4 Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, People's Republic of China.
authors.forename: P
authors.initials: P
authors.lastname: Hou
authors.affiliation: 1 Renal Division, Peking University First Hospital, People's Republic of China.|2 Peking University Institute of Nephrology, People's Republic of China.|3 Key Laboratory of Renal Disease, Ministry of Health of China, People's Republic of China.|4 Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Lv
authors.affiliation: 1 Renal Division, Peking University First Hospital, People's Republic of China.|2 Peking University Institute of Nephrology, People's Republic of China.|3 Key Laboratory of Renal Disease, Ministry of Health of China, People's Republic of China.|4 Key Laboratory of Chronic Kidney Disease Prevention and Treatment (Peking University), Ministry of Education, Beijing, People's Republic of China.
authors.forename: H
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000328:Adult; D056648:Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis / Q000209:etiology / Q000235:genetics*; D016022:Case-Control Studies; D056915:DNA Copy Number Variations; D005260:Female; D058851:GPI-Linked Proteins / Q000235:genetics; D020022:Genetic Predisposition to Disease; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000209:etiology / Q000235:genetics*; D008297:Male; D017452:Receptors, IgG / Q000235:genetics*
chemical_list: C496124:FCGR3A protein, human; C428200:FCGR3B protein, human; D058851:GPI-Linked Proteins; D017452:Receptors, IgG
keywords: FCGR3A; FCGR3B; anti-neutrophil cytoplasmic antibody-associated systematic vasculitis (AASV); copy number variation (CNV); systemic lupus erythematosus (SLE)