The study provided evidence against the major impact of the GNB3 C825T polymorphism on the increased risk of the development of nephropathy or hypertension in type 2 diabetic patients.
Because hypertension is a known risk factor for the development of clinically manifest progressive renal disease, we examined the C825T polymorphism in older hemodialysis patients suffering from nondiabetic renal disease or type 2 diabetes with presumed diabetic nephropathy, respectively, and in older healthy controls.
Within this group we have also examined the inheritance of C825T alleles in a family study and found no evidence for excess transmission of the T allele to Type I diabetic offspring with nephropathy (T allele transmitted to 51% of nephropathy offspring, C allele transmitted to 49% of nephropathy offspring, p = 0.79).