Diabetes 54:1185-1190, 2005
© 2005 by the American Diabetes Association, Inc.
Genetic Analysis of HNF4A Polymorphisms in Caucasian-American Type 2 Diabetes
Allison M. Bagwell1,2,
Jennifer L. Bento2,3,
Josyf C. Mychaleckyj2,4,5,
Barry I. Freedman3,
Carl D. Langefeld5, and
Donald W. Bowden1,2,3,4
1 Molecular Genetics Program, Wake Forest University School of Medicine, Winston-Salem, North Carolina
2 Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
3 Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina
4 Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina
5 Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina
Hepatocyte nuclear factor 4 (HNF4A), the gene for the maturity-onset diabetes of the young type 1 monogenic form of type 2 diabetes, is within the type 2 diabeteslinked region on chromosome 20q12-q13.1 and, consequently, is a positional candidate gene for type 2 diabetes in the general population. Previous studies have identified only a few rare coding mutations. However, recent studies suggest that single nucleotide polymorphisms (SNPs) located near the P2 (ß-cell) promoter of HNF4A are associated with diabetes susceptibility. In this study, we evaluated 23 SNPs spanning 111 kb including the HNF4A gene for association with type 2 diabetes in a collection of Caucasian type 2 diabetic patients with end-stage renal disease (n = 300) and control subjects (n = 310). None of the individual SNPs were associated with type 2 diabetes in this collection of case subjects (P values ranging from 0.06 to 0.99). However, haplotype analysis identifies significant differences between haplotype frequencies in type 2 diabetic case and control subjects (P = 0.013 to P < 0.001), with two uncommon "risk" haplotypes (2.4 and 2.2% of chromosomes) and two uncommon "protective" haplotypes (7.1 and 5.0% of chromosomes) accounting for the evidence of association. Our results suggest that type 2 diabetes linked to 20q1213 is a heterogeneous disease in which different populations may have different type 2 diabetes susceptibility loci.
Address correspondence and reprint requests to Donald W. Bowden, Department of Biochemistry, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, NC 27157. E-mail: dbowden{at}wfubmc.edu

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Copyright © 2005 by the American Diabetes Association.
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