Summary
We investigated the contribution of polymorphisms in the angiotensin II type 1 receptor gene (AGTR1) to renal complications in an inception cohort of 152 insulin-dependent diabetic (IDDM) patients examined 15-21 years after diabetes onset. This nested case-control study included 79 normoal-buminuric control subjects and 73 cases with evidence of nephropathy ranging from microalbuminuria to overt proteinuria. Subjects were genotyped for two AGTR1 polymorphisms (T573→C and A1166→C), and an adjacent CA repeat microsatellite. Allele C1166 and the 140 bp allele of the microsatellite were more frequent among nephropathy cases than normoalbuminuric control subjects (0.322 vs 0.247, and 0.618 vs 0.521, respectively), but these differences were not statistically significant. Although not significant by themselves, the AGTR1 polymorphisms contributed significantly to the risk of diabetic nephropathy when accompanied by poor glycaemic control. Among patients with frequent severe hyperglycaemia during the first decade of diabetes, the relative risk of nephropathy among allele C1166 carriers was 12.1 (95 % CI: 3.7-39.8), whereas it was only 1.4 (95 % CI: 0.6-3.5) among allele A1166 homozygotes. The difference between relative risks was highly significant (x 2 = 8.25, p = 0.004 with 1 df). A similar pattern of higher risk of microalbuminuria, specifically among those carriers of allele C1166 who had poor glycaemic control was also found in an independent study of a cross-sectional sample of 551 IDDM individuals, although the effect was smaller in magnitude. We conclude that DNA sequence differences in the AGTR1 gene may modify the noxious effects of hyperglycaemia on the kidney. Allele C1166 carriers might especially benefit from nephropathy prevention programmes. [Diabetologia (1997) 40: 1293-1299]
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Abbreviations
- IDDM:
-
insulin-dependent diabetes mellitus
- ACE:
-
angiotensin converting enzyme
- AER:
-
albumin excretio rate
- ACR:
-
albumin creatinine ratio
- DGGE:
-
denaturing gradient gel electrophoresis
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Doria, A., Onuma, T., Warram, J.H. et al. Synergistic effect of angiotensin II type 1 receptor genotype and poor glycaemic control on risk of nephropathy in IDDM. Diabetologia 40, 1293–1299 (1997). https://doi.org/10.1007/s001250050823
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DOI: https://doi.org/10.1007/s001250050823