Title

AKT1 polymorphisms are associated with risk for metabolic syndrome

Authors

Authors

J. M. Devaney; H. Gordish-Dressman; B. T. Harmon; M. K. Bradbury; S. A. Devaney; T. B. Harris; P. D. Thompson; P. M. Clarkson; T. B. Price; T. J. Angelopoulos; P. M. Gordon; N. M. Moyna; L. S. Pescatello; P. S. Visich; R. F. Zoeller; R. L. Seip; J. Seo; B. H. Kim; L. L. Tosi; M. Garcia; R. L. Li; J. M. Zmuda; M. J. Delmonico; R. S. Lindsay; B. V. Howard; W. E. Kraus;E. P. Hoffman

Comments

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Abbreviated Journal Title

Hum. Genet.

Keywords

GENOME-WIDE ASSOCIATION; INSULIN-SECRETION; AMERICAN-INDIANS; DENATURING; HPLC; GLUCOSE-LEVELS; EMERGING ROLE; MUSCLE MASS; PROTEIN; LOCI; SUSCEPTIBILITY; Genetics & Heredity

Abstract

Converging lines of evidence suggest that AKT1 is a major mediator of the responses to insulin, insulin-like growth factor 1 (IGF1), and glucose. AKT1 also plays a key role in the regulation of both muscle cell hypertrophy and atrophy. We hypothesized that AKT1 variants may play a role in the endophenotypes that make up metabolic syndrome. We studied a 12-kb region including the first exon of the AKT1 gene for association with metabolic syndrome-related phenotypes in four study populations [FAMUSS cohort (n = 574; age 23.7 +/- A 5.7 years), Strong Heart Study (SHS) (n = 2,134; age 55.5 +/- A 7.9 years), Dynamics of Health, Aging and Body Composition (Health ABC) (n = 3,075; age 73.6 +/- A 2.9 years), and Studies of a Targeted Risk Reduction Intervention through Defined Exercise (STRRIDE) (n = 175; age 40-65 years)]. We identified a three SNP haplotype that we call H1, which represents the ancestral alleles at the three loci and H2, which represents the derived alleles at the three loci. In young adult European Americans (FAMUSS), H1 was associated with higher fasting glucose levels in females. In middle age Native Americans (SHS), H1 carriers showed higher fasting insulin and HOMA in males, and higher BMI in females. In older African-American and European American subjects (Health ABC) H1 carriers showed a higher incidence of metabolic syndrome. Homozygotes for the H1 haplotype showed about twice the risk of metabolic syndrome in both males and females (p < 0.001). In middle-aged European Americans with insulin resistance (STRRIDE) studied by intravenous glucose tolerance test (IVGTT), H1 carriers showed increased insulin resistance due to the Sg component (p = 0.021). The 12-kb haplotype is a risk factor for metabolic syndrome and insulin resistance that needs to be explored in further populations.

Journal Title

Human Genetics

Volume

129

Issue/Number

2

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

129

Last Page

139

WOS Identifier

WOS:000286194000002

ISSN

0340-6717

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