Association of monocyte chemoattractant protein-1 (MCP-1)2518A/G polymorphism with proliferative diabetic retinopathy in northern Chinese type 2 diabetes

• Published in: Graefe's archive for clinical and experimental ophthalmology Vol. 252; no. 12; pp. 1921 - 1926
• Main Authors: Dong, Li, lv, Xiao Ying, Wang, Bin Jie, Wang, Ye Qing, Mu, Hua, Feng, Zhuo Lei, Liu, Ping
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2014; Springer Nature B.V
• Subjects: Adult; Aged; Asian Continental Ancestry Group - genetics; Case-Control Studies; Chemokine CCL2 - genetics; China - epidemiology; Diabetes Mellitus, Type 2 - genetics; Diabetic retinopathy; Diabetic Retinopathy - diagnosis; Diabetic Retinopathy - genetics; Female; Gene Frequency; Genetic Predisposition to Disease; Genotyping Techniques; Humans; Macular Edema - diagnosis; Macular Edema - genetics; Male; Medicine; Medicine & Public Health; Middle Aged; Ophthalmology; Polymerase Chain Reaction; Polymorphism, Single Nucleotide; Retinal Disorders; China; Proliferative diabetic retinopathy (PDR); Type 2 diabetic retinopathy; Diabetic macular edema (DME); Single nucleotide polymorphism (SNP); Monocyte chemoattractant protein-1 (MCP-1)
• DOI: 10.1007/s00417-014-2651-1
• ISSN: 0721-832X; 1435-702X

Background The pathogenesis of proliferative diabetic retinopathy (PDR) remains poorly understood. Recent studies have implicated that monocyte chemoattractant protein-1 (MCP-1) is associated with diabetic microvascular or macrovascular complications. However, the relationship between single nucleotide polymorphism(SNP)c.2518A/G -rs1024611 in the MCP-1 gene with diabetic retinopathy remains controversial. In the present study, we evaluated the association of SNP in the MCP-1 gene with diabetic retinopathy (DR) and diabetic macular edema (DME) in a Chinese population from Northern China with type 2 diabetes. Methods We conducted a case–control study, which enrolled 1,043 subjects with type 2 diabetes (528 with DR, including 277PDR; 515 without DR), and SNP genotyping of c.2518A/G in the MCP-1 gene was performed using the polymerase chain reaction. Genomic DNA was isolated from 3 ml samples of whole blood using a modified conventional DNA extraction method. The genotype and allele frequencies of 2518A/G were studied by using an automated DNA sequencer (ABI PRISM 3730 DNA Sequencer). Results The demographic and clinical characteristics did not differ among genotype subgroups. The MCP-1(−2518) GG genotype was significantly associated with DR susceptibility with OR of 1.481 (95 % CI, 1.019-2.153) ( P  = 0.046). There were no significant differences in the MCP-1(−2518) G allele frequencies in DR compared to non-diabetic retinopathy (DNR) ( P  > 0.05, OR = 0.841, 95 % CI, 0.705–1.002). The MCP-1(−2518) GG genotype was significantly associated with high-risk PDR susceptibility with OR of 2.656 (95 % CI, 1.222–5.775) ( P  = 0.014). The MCP-1(−2518) G allele was significantly increased in high-risk PDR patients ( P  = 0.020, OR = 1.481, 95 % CI, 1.070–2.051) compared with A allele. Genotype and allele frequencies of various DME of the DR patients were compared, but there were no significant associations established ( P  > 0.05). Conclusions It is likely that the MCP-1 c.2518G/G genotype is a susceptibility gene for DR in Chinese type 2 diabetic patients, especially the high-risk PDR. There is no association with DME and c.2518G/G .