Aim: To evaluate the aldose reductase (ALR2, rs759853), receptor for advanced glycation end products (RAGE, rs2070600), and vascular endothelial growth factor (VEGF, rs833061) association with diabetic retinopathy in type 2 diabetic patients of Khyber Pakhtunkhwa population.
Methods: A case-control study was conducted on a total of 550 subjects consisting of 186 with diabetic retinopathy (DR) having type 2 diabetes, 180 had type 2 diabetes (T2DM), and 184 healthy controls (HC). All the samples were subjected to DNA isolation using salting-out method followed by SNP genotyping through Tetra-ARMS PCR. Chi square and Exact Fischer tests were used for alleles and genotypes distribution. Odd ratio and confidence interval values were found out by online software Medcalc Odd ratio Calculator.
Results: Multiple parameters such as random blood sugar (RBS) (p < 0.001), fasting blood sugar (FBS) (p < 0.001), HbA1c (p < 0.001), total cholesterol (p < 0.001), LDL (p < 0.001), HDL (p < 0.001), BMI (p < 0.001) and hypertension (p = 0.018) exhibited strong association with DR as compared to DM and HC. Our results displayed that the VEGF-rs833061 and RAGE- rs2070600 exhibited significant association (p < 0.05) with an increased DR risk, when compared with T2DM. In contrast, ALR2 didn't display association with DR (p > 0.05) when compared with T2DM, but showed association (p < 0.05) when compared with HC.
Conclusion: Statistically significant association was observed in VEGF-rs833061 and RAGE-rs2070600 with DR in type 2 diabetic patients. While, ALR2- rs759853 didn't exhibit significant association with DR. This is the first study to report the association of candidate genes (ALR2, VEGF and RAGE) with DR in type 2 diabetes of Khyber Pakhtunkhwa population. More similar research studies are recommended with larger data sets in other ethnicities both national and international.
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