S-Space College of Medicine/School of Medicine (의과대학/대학원) Molecular and Genomic Medicine (분자유전체의학전공) Journal Papers (저널논문_분자유전체의학전공)
Polymorphisms in the ghrelin gene are associated with serum high-density lipoprotein cholesterol level and not with type 2 diabetes mellitus in Koreans
- Issue Date
- Endocrine Society
- J Clin Endocrinol Metab. 2006 Nov;91(11):4657-63. Epub 2006 Sep 5.
- Aged ; Cholesterol, HDL/*blood ; DNA-Binding Proteins/metabolism ; Diabetes Mellitus, Type 2/*epidemiology/genetics ; Female ; Ghrelin ; Humans ; Korea/epidemiology ; Linkage (Genetics) ; Male ; Middle Aged ; Peptide Hormones/*genetics ; Phenotype ; Promoter Regions, Genetic ; Sequence Analysis, DNA ; Transcription Factors/metabolism ; Transcriptional Activation ; Polymorphism, Genetic
- CONTEXT: Ghrelin is known to play a role in glucose metabolism and in beta-cell function. There are controversies regarding the role of ghrelin polymorphisms in diabetes and diabetes-related phenotypes. OBJECTIVE: The objective of this study was to examine polymorphisms of the ghrelin gene in a Korean cohort and investigate associations between them and susceptibility to type 2 diabetes and its related phenotypes. DESIGN AND PATIENTS: The ghrelin gene was sequenced to identify polymorphisms in 24 DNA samples. Common variants were then genotyped in 760 type 2 diabetic patients and 641 nondiabetic subjects. Genetic associations with diabetes-related phenotypes were also analyzed. RESULTS: Nine polymorphisms were identified, and four common polymorphisms [g.-1500C>G, g.-1062G > C, g.-994C > T, g.+408C > A (Leu72Met)] were genotyped in a larger study. The genotype distributions of these four common polymorphisms in type 2 diabetes patients were similar to those of normal nondiabetic controls. However, these four common polymorphisms were variably associated with several diabetes-related phenotypes, such as high-density lipoprotein (HDL) cholesterol, fasting plasma glucose, and homeostasis model assessment of insulin resistance. In particular, subjects harboring g.-1062C were associated with a lower serum HDL cholesterol level after adjusting for other variables (P = 0.0004 or 0.01 after Bonferroni correction for 24 tests). CONCLUSION: The aforementioned four common polymorphisms in the ghrelin gene were not found to be significantly associated with susceptibility to type 2 diabetes mellitus in the Korean population. However, the common polymorphism g.-1062G > C in the promoter region of the ghrelin gene was found to be significantly associated with serum HDL cholesterol levels.
- 0021-972X (Print)