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(Hypertension. 1998;31:896-899.)
© 1998 American Heart Association, Inc.

Scientific Contributions

Gender-Specific Association of M235T Polymorphism in Angiotensinogen Gene and Diabetic Nephropathy in NIDDM

Maria Beatriz S. Freire; Linong Ji; Tomio Onuma; Tihamer Orban; James H. Warram; ; Andrzej S. Krolewski

From the Research Division, Joslin Diabetes Center, and Department of Medicine, Harvard Medical School, Boston, Mass.

Abstract—This study examined the association between the development of nephropathy in non–insulin-dependent diabetes mellitus (NIDDM) patients and M235T polymorphism in the angiotensinogen gene. White NIDDM patients with diabetic nephropathy (case subjects, n=117) and patients without any evidence of nephropathy and 10 years of NIDDM (control subjects, n=125) were selected from among patients of the Joslin Diabetes Center and examined. In addition to a standardized examination, blood was drawn for DNA and determination of M235T genotypes at the angiotensinogen locus. For the angiotensinogen gene, the frequency of the genotype 235T/235T, known to be associated with essential hypertension, was higher among case subjects with nephropathy than in control subjects without this complication. This difference, expressed as the odds ratio for nephropathy among 235T/235T homozygotes in comparison with all other genotypes, was 2.2 (95% confidence interval, 1.1 to 4.4). The difference, however, was confined to men (odds ratio, 4.8; 95% confidence interval, 1.5 to 14.9), with the distribution of genotypes in case and control subjects being equal among women (odds ratio, 1.1). DNA polymorphism M235T in the angiotensinogen gene, which is associated with higher expression of this gene, contributes to the risk of diabetic nephropathy in NIDDM men but not in women.

Key Words: nephropathy • angiotensinogen • polymorphism • diabetes

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