Abstract
Genetic predisposition has been proposed to be a major determinant in the development of renal complications of diabetes. Osteopontin (OPN) has been suggested to be associated with renal diseases characterized by tubulointerstitial fibrosis and proteinuria. However, information on association of genetic polymorphisms in OPN with diabetic nephropathy is lacking. Thus, the present study was designed with the aim to examine the association of an OPN gene promoter polymorphism with diabetic nephropathy in Asian Indians. OPN C-443T (rs11730582) polymorphism was determined in 1115 type 2 diabetic patients belonging to two independently ascertained cohorts using Real time PCR based Taqman assay. We observed a nearly threefold elevated risk of diabetic nephropathy among carriers of T allele and TT genotype of OPN C-443T polymorphism. Further, this allele was found to be significantly associated with proteinuria and lower eGFR, a hallmark of diabetic nephropathy, in both our cohorts. This is the first study which suggests that OPN C-443T polymorphism may be a significant risk factor for diabetic nephropathy in type 2 diabetic patients.
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