Copy number variations of HLA-DRB5 is associated with systemic lupus erythematosus risk in Chinese Han population

• Published in: Acta biochimica et biophysica Sinica Vol. 46; no. 2; pp. 155 - 160
• Main Authors: Wu, Lijun, Guo, Shicheng, Yang, Dongqin, Ma, Yanyun, Ji, Hengdong, Chen, Yulin, Zhang, Jun, Wang, Yi, Jin, Li, Wang, Jiucun, Liu, Jie
• Format: Journal Article
• Language: English
• Published: China 01.02.2014
• Subjects: Adult; Asian Continental Ancestry Group - genetics; DNA Copy Number Variations; Female; Genetic Predisposition to Disease; HLA-DRB5 Chains - genetics; Humans; Lupus Erythematosus, Systemic - genetics; Lupus Erythematosus, Systemic - immunology; Male; Middle Aged; mRNA水平; Risk; 中国汉族人群; 变异; 拷贝数; 比较基因组杂交; 系统性红斑狼疮; 自身免疫性疾病; 风险; human leukocyte antigen; copy number variations; systemic lupus erythematosus
• ISSN: 1672-9145; 1745-7270; 1745-7270
• DOI: 10.1093/abbs/gmt137

Systemic lupus erythematosus （SLE） is a polygenic, systemic, autoimmune disease. Copy number variants （CNVS） have been discovered to be associated with a number of complex disorders. We undertook the current study to explore the potential associations between genomic CNVS and SLE in Chinese Han population. In the discovery stage, seven SLE patients were examined with the high-density comparative genomic hybridization microarrays in the screening test for SLE associated CNVS. Then, in the validation stage, 135 SLE patients and 219 matched healthy subjects were investigated for the CNVS of gene HLA-DRB5 by AccuCopyTM technol- ogy. Quantitative polymerase chain reaction was carried out to determine the copy number （CN） and mRNA level of HLA- DRB5 in SLE patients. Although the mRNA level of HLA- DRB5 between the CN deletion group and the CN normal group in SLE patients was not statistically positive （P = 0.46）, our results still showed more CN of HLA-DRB5 in SLE patients than in healthy controls （P = 3.98×10^-6）. Odds ratio for CN deletion was 0.38 （95% confidence interval （C1）, 0.23-0.61, P = 7.79×10^-5） and for CN duplication was 1.89 （95% CI, 0.56-7.66, P = 0.37）, respectively. These findings indicated that CNVS of HLA-DRB5 was associated with the risk of SLE, and CN deletion appeared to be protective for SLE.