Analysis of FOXO1A as a candidate gene for type 2 diabetes.

Abstract:

:The human forkhead box O1A (FOXO1A) gene on chromosome 13q14.1 is a key transcription factor in insulin signaling in liver and adipose tissue and plays a central role in the regulation of key pancreatic beta-cell genes including IPF1. We hypothesized that sequence variants of FOXO1A contribute to the observed defects in hepatic and peripheral insulin action and altered beta-cell compensation that characterize type 2 diabetes (T2DM). To test this hypothesis, we screened the three exons, 3' untranslated region, and 5' flanking region for sequence variants in Caucasian and African-American individuals with early onset (<45 years) T2DM. We identified only six variants; none altered the coding sequence, and except for one variant in the 3' untranslated region, they were rare or absent in Caucasians. To increase coverage of the gene, we selected seven additional variants in the large first intron and 5' flanking region, thus providing 13 variants that spanned 116.4kb. Based on frequency and linkage disequilibrium patterns in a subset of individuals, we selected eight SNPs to type in a Caucasian population comprising 192 unrelated nondiabetic control individuals and 192 individuals with T2DM, and 10 SNPs to type in 182 controls and 352 diabetic individuals of African-American ancestry. No variant was associated with T2DM (African-Americans, p>0.08; Caucasians, p>0.09). Of the 8 Caucasian SNPs, six comprised a single haplotype block spanning over 100kb and including most of the large first intron. In contrast, no block was observed among SNPs typed in African-Americans. No haplotype was associated with T2DM. FOXO1A variation is rare and is unlikely to contribute to T2DM in either Caucasian or African-American populations.

journal_name

Mol Genet Metab

authors

Karim MA,Craig RL,Wang X,Hale TC,Elbein SC

doi

10.1016/j.ymgme.2006.01.003

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

171-7

issue

2

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(06)00004-7

journal_volume

88

pub_type

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