A Novel −192c/g Mutation in the Proximal P2 Promoter of the Hepatocyte Nuclear Factor-4α Gene (HNF4A) Associates With Late-Onset Diabetes
- 1 June 2006
- journal article
- Published by American Diabetes Association in Diabetes
- Vol. 55 (6), 1869-1873
- https://doi.org/10.2337/db05-1684
Abstract
Recently, it has been shown that mutations in the P2 promoter of the hepatocyte nuclear factor (HNF)-4α gene (HNF4A) cause maturity-onset diabetes of the young (MODY), while single nucleotide polymorphisms in this locus are associated with type 2 diabetes. In this study, we examined 1,189 bp of the P2 promoter and the associated exon 1D of HNF4A for variations associated with diabetes in 114 patients with type 2 diabetes, 72 MODYX probands, and 85 women with previous gestational diabetes mellitus. A −192c/g mutation was found in five patients. We screened 1,587 diabetic subjects and 4,812 glucose-tolerant subjects for the −192c/g mutation and identified 5 diabetic and 1 glucose-tolerant mutation carriers (P = 0.004). Examination of the families showed that carriers of the −192c/g mutation had a significantly impaired glucose-stimulated insulin release and lower levels of serum total cholesterol compared with matched control subjects. Furthermore, the mutation disrupted the binding of an unidentified sequence-specific DNA binding complex present in human islet extracts. Also, two novel linked polymorphisms in the P2 promoter at positions −1107g/t and −858c/t were identified. These variants were not significantly associated with type 2 diabetes or any pre-diabetic traits. In conclusion, a rare, novel mutation that disrupts a protein binding site in the pancreatic HNF4A promoter associates with late-onset diabetes.Keywords
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