Journal
CLINICAL BIOCHEMISTRY
Volume 37, Issue 8, Pages 660-665Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.clinbiochem.2004.03.014
Keywords
IGF-I; microsatellite; polymorphisms; serum triglyceride; type 2 diabetes; genetic epidemiology
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Objective: The aim of the present study was to examine if absence of a common allele in a microsatellite polymorphism in the insulin-like growth factor I (IGF-I) promoter was associated with type 2 diabetes and alterations in quantitative traits in glucose-tolerant subjects. Methods: The IGF-I promoter polymorphism was investigated in a case-control study comprising 694 type 2 diabetic patients and 218 glucose-tolerant control subjects, and in two genotype-quantitative trait studies involving 208 glucose-tolerant first-degree offspring of type 2 diabetic patients and 218 unrelated middle-aged subjects with normal glucose tolerance. Results: No associations were found between the lack of the common promoter allele and type 2 diabetes (P = 0.25) or estimates of glucose metabolism in glucose-tolerant subjects. Presence of the wild-type allele was associated with an increase in fasting serum triglyceride levels in the group of 208 glucose-tolerant first-degree offspring of type 2 diabetic patients (P = 0.002). This finding was replicated in an independent sample of 218 unrelated middle-aged subjects with normal glucose tolerance (P = 0.007). Conclusion: The present study provides evidence that the common wild-type allele of the IGF-I promoter polymorphism is associated with increased levels of fasting serum triglyceride in glucose-tolerant whites. (C) 2004 The Canadian Society of Clinical Chemists. All rights reserved.
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