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Human Genetics |

,

* Departments of Public Health Sciences,
Biochemistry/Human Genome Center, and
Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
Address correspondence to: Dr. Yongmei Liu, Wake Forest University School of Medicine, Department of Public Health Sciences, Medical Center Boulevard, Winston-Salem, NC 27157. Phone: 336-716-9503; Fax: 336-716-6427; E-mail: yoliu{at}wfubmc.edu
Received for publication October 1, 2004. Accepted for publication January 21, 2005.
Albuminuria demonstrates significant heritability in multiply affected hypertensive and diabetic families. The role of endothelial nitric oxide synthase (eNOS) gene variants as risk factors for albuminuria was investigated in 590 European American siblings from 230 families in the Diabetes Heart Study. Two polymorphisms in the eNOS gene (T-786C in the promoter region and Glu298Asp in exon 7) were genotyped. Albuminuria was defined as an albumin:creatinine ratio (ACR)
17 mg/g in men and
25 mg/g in women. Tests of association were based on generalized estimating equations, and tests of linkage disequilibrium were based on the quantitative pedigree disequilibrium test. A total of 83% of participants had type 2 diabetes. The median ACR was 10.7 mg/g (interquartile range, 5.1 to 32.8), and 34% (202 of 590) of participants had an elevated ACR. The eNOS 786C allele but not the Glu298Asp was associated with increased ACR (31% increase in absolute level of ACR for each additional copy of the 786C allele; P < 0.0001) and a higher risk for albuminuria (odds ratio, 1.55 for each additional copy of the 786C allele; P = 0.0005). Adjustment for the nongenetic determinants of ACR had no significant effect on the results; neither did stratification by gender, presence of diabetes, and the Glu298Asp genotype. Results were confirmed by quantitative pedigree disequilibrium test analysis and were consistent with haplotype analysis. The 786C eNOS variant was positively correlated with a higher prevalence and a greater degree of albuminuria in European American families in both diabetic and nondiabetic family members.
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