Association Between IL-6 Polymorphisms and Diabetic Nephropathy Risk: A Meta-analysis

Area of Science:

• Genetics
• Nephrology
• Endocrinology

Background:

• Diabetic nephropathy (DN) is a significant complication of diabetes mellitus.
• Interleukin-6 (IL-6) is a pro-inflammatory cytokine implicated in various disease processes, including diabetic complications.
• Genetic variations in the IL-6 gene may influence an individual's susceptibility to DN.

Purpose of the Study:

• To systematically evaluate the association between common interleukin-6 (IL-6) gene polymorphisms and the risk of developing diabetic nephropathy (DN).
• To synthesize evidence from existing studies using a meta-analysis approach to clarify the role of IL-6 polymorphisms in DN susceptibility.

Main Methods:

• A comprehensive literature search was conducted across PubMed, Embase, and Cochrane Library databases.
• Eleven eligible studies were included in the meta-analysis.
• Study quality was assessed using the Newcastle-Ottawa Scale, and heterogeneity was evaluated using the Q test and I² statistic. Odds ratios (ORs) with 95% confidence intervals (CIs) were calculated to determine associations. Subgroup, sensitivity, and publication bias analyses were performed.

Main Results:

• The meta-analysis indicated that the 'C' allele of IL-6 rs1800795 was associated with a decreased risk of DN (P=0.0471).
• The 'G' allele of IL-6 rs1800796 was predominantly linked to higher DN risks (GG vs. CC: P=0.0194; GG vs. CC+GC: P=0.0196).
• The 'C' allele of IL-6 rs1800797 was implicated in a higher prevalence of DN (C vs. G: P<0.0001). IL-6 rs2069837 and rs2069840 showed no significant correlation with DN susceptibility.

Conclusions:

• Specific IL-6 gene polymorphisms, namely rs1800795, rs1800796, and rs1800797, play significant roles in the development of diabetic nephropathy.
• IL-6 rs2069837 and rs2069840 polymorphisms may not be directly associated with susceptibility to DN.
• These findings highlight the potential genetic contribution of IL-6 to DN pathogenesis and may inform future research and clinical strategies.