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NDT Advance Access published online on November 22, 2006
Nephrology Dialysis Transplantation, doi:10.1093/ndt/gfl641
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© The Author [2006]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Association of the VEGF gene polymorphism with diabetic retinopathy in type 2 diabetes patients

Monika Buraczynska, Piotr Ksiazek, Iwona Baranowicz-Gaszczyk and Lucyna Jozwiak

Laboratory for Molecular Diagnostics of Multifactorial Diseases and Department of Nephrology, Skubiszewski Medical University, Lublin, Poland

Correspondence and offprint requests to: Correspondence and offprint requests to: Monika Buraczynska, Laboratory for Molecular Diagnostics of Multifactorial Diseases, Department of Nephrology, Skubiszewski Medical University Dr K. Jaczewskiego 8, 20-954 Lublin, Poland. Email: monika.buraczynska{at}am.lublin.pl



  Abstract

Background. Diabetic microvascular complications are the major causes of morbidity and early mortality in diabetes. Vascular endothelial growth factor (VEGF) is a potent multifunctional cytokine which plays a key role in the pathogenesis of diabetic microvascular complications. We examined the possible association of the VEGF gene polymorphisms with diabetic nephropathy and retinopathy in type 2 diabetes patients.

Methods. Genotyping of the VEGF gene insertion/deletion (I/D) and +405 polymorphisms was done by the polymerase chain reaction (PCR) and restriction fragment length polymorphism methods. A total of 426 patients with type 2 diabetes and 493 healthy subjects were genotyped. The frequency of VEGF alleles and genotype distribution were compared in diabetic and control groups.

Results. The distribution of the VEGF DD genotype was significantly different in patients with diabetic retinopathy compared with healthy controls, entire diabetic group and patients with no complications (44 vs. 23, 30 and 21%, respectively; P < 0.01). Such differences were not observed in the diabetic nephropathy group. The odds ratio for the D allele was 2.27 (95% CI 1.59–3.25). The multivariate logistic regression analysis revealed that the D allele of the VEGF gene I/D polymorphism was an independent risk factor of retinopathy (P < 0.001). The VEGF +405 genotype was not associated with diabetic complications in type 2 diabetes patients.

Conclusion. Our study suggests that the I/D polymorphism in the promoter region of the VEGF gene is associated with retinopathy but not nephropathy in type 2 diabetes patients. The multivariate logistic regression analysis showed that the D allele of the VEGF polymorphism is an independent risk factor of diabetic retinopathy after controlling for other clinical variables.

Keywords: DNA polymorphism; microvascular complications; polymerase chain reaction; type 2 diabetes; vascular endothelial growth factor


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