Abstract
We recently found in a white population that the genes encoding angiotensin-converting enzyme (ACE, I/D polymorphism), α-adducin (Gly460Trp), and aldosterone synthase (−344C/T) jointly influence renal function. We therefore investigated in a Chinese population the associations between the serum concentrations of creatinine and uric acid and these three genetic polymorphisms. We genotyped 471 ethnic Han Chinese subjects from 125 nuclear families recruited in northern China via random population sampling (75%) and at specialized hypertension clinics (25%). We performed population-based and family-based association analyses using generalized estimating equations (GEE) and quantitative transmission disequilibrium test (QTDT), respectively, while controlling for covariables. The participants were 39.7 years old and included 235 women (49.9%). The blood pressure measured at the subjects’ homes averaged 126/80 mmHg. Mean values were 71 µmol/l for serum creatinine, 111 ml min−1 1.73 m−2 for calculated creatinine clearance, and 236 µmol/l for serum uric acid. With adjustment for covariables, GEE analyses of single genes demonstrated that serum uric acid, but not serum creatinine, was positively associated with the ACE D allele. Serum uric acid concentrations were 15.8 µmol/l (95% confidence interval 3.3–28.2) and 25.7 µmol/l (11.1–40.2) higher in DD homozygotes than in ID and II subjects, respectively. Further GEE analyses of the three genes combined showed that the association between serum uric acid and the ACE polymorphism was confined to carriers of the α-adducin Gly and/or aldosterone synthase C alleles. Sensitivity analyses in parents and offspring separately as well as QTDT analyses were confirmatory. Among 114 informative offspring carrying the α-adducin Gly allele serum uric acid was significantly and positively associated with the transmission of the ACE D allele (β=20.7 µmol/l). In conclusion, the present study extends our previous findings on the combined effects of the three candidate genes and supports the concept that these genetic polymorphisms jointly influence renal function.
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Abbreviations
- ACE :
-
Angiotensin-converting enzyme gene
- GEE :
-
Generalized estimating equations
- QTDT :
-
Quantitative transmission disequilibrium test
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Acknowledgements
The study was supported by a grant (1999) from the Foundation of Janssen Scientific Research Council (Beijing, China) to J.X., the Bilateral Scientific and Technical Collaboration between Flanders and China coordinated by J.A.S. and L.L. (project BIL98/15), and a grant from the Ministero della Sanità (Milan, Italy) to G.B. (RF200-00-49). In 2003 J.G.W was additionally supported by grant BIL02/10. The authors acknowledge the expert assistance of Aiping Niu, Peixiang Zhang, and Zhiling Du (Gaoping City Hospital, Gaoping, Shanxi Province, China) and Sylvia Van Hulle and Renilde Wolfs (Study Coordinating Centre, Leuven, Belgium).
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Wang, JG., Liu, L., Zagato, L. et al. Renal function in relation to three candidate genes in a Chinese population. J Mol Med 82, 715–722 (2004). https://doi.org/10.1007/s00109-004-0574-8
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DOI: https://doi.org/10.1007/s00109-004-0574-8