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The role of the insertion/deletion polymorphism of the angiotensin-converting enzyme (ACE) gene in the genesis of diabetic nephropathy has been controversial. It has recently been proposed that progression occurs more rapidly in individuals with diabetic and non-diabetic renal disease who are homozygous for the D allele. We studied 658 patients with type II diabetes, 347 without diabetic nephropathy and 311 with various stages of diabetic nephropathy, and determined the I/D polymorphism of the ACE gene. Patients at the extremes of renal risk, i.e. normotensive patients without antihypertensive treatment and without nephropathy (n = 144), vs patients on dialysis (n = 61), differed with respect to genotype (DD 36.8% vs 57.4%; P = 0.007) and allele frequencies (D 0.59 vs 0.76; P &lt; 0.001). In contrast, patients with and without presumed nephropathy as assessed by albuminuria did not differ with respect to DD genotype. In conclusion, in this study, which was limited by sample size, patients with the highest renal risk more frequently had the DD genotype. This would be compatible with a greater risk of (or rate of) progression to end-stage renal failure.

Excess of DD homozygotes in haemodialysed patients with type II diabetes. The Diabetic Nephropathy Study Group