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Diabetologia
Published in: Diabetologia 1/2006

01-01-2006 | Article

Studies of the association of the GNB3 825C>T polymorphism with components of the metabolic syndrome in white Danes

Authors: G. Andersen, J. Overgaard, A. Albrechtsen, C. Glümer, K. Borch-Johnsen, T. Jørgensen, T. Hansen, O. Pedersen

Published in: Diabetologia | Issue 1/2006

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Abstract

Aims/hypothesis

The 825C>T polymorphism in the gene encoding the G protein β3 subunit (GNB3) causes enhanced G protein activation and increased in vitro cell proliferation. This polymorphism is also repeatedly associated with an increased risk of hypertension and has been studied in relation to obesity with divergent results. Only a few association studies have investigated whether this polymorphism is related to type 2 diabetes or the metabolic syndrome. We estimated the impact of the GNB3 825C>T polymorphism in relatively large-scale association studies of common phenotypes of the metabolic syndrome.

Materials and methods

The GNB3 825C>T polymorphism was genotyped in 7,518 white Danish subjects using mass spectrometry analysis of PCR products. Case–control studies were undertaken for obesity, hypertension, type 2 diabetes and the metabolic syndrome, and a meta-analysis including data from the present study and previous studies of hypertension was performed. Quantitative trait studies of metabolic variables were carried out in 4,387 glucose-tolerant subjects.

Results

We observed minor differences in 825C>T genotype distributions for type 2 diabetes (CC/CT/TT 49/41/10% (control) vs 46/46/9% (cases), respectively, p=0.007); however, after correction for multiple testing, these were not statistically significant. No association was found with hypertension, obesity or the metabolic syndrome. Curiously, the T allele was associated with nominally lower systolic and diastolic blood pressure levels—a finding in contrast with most previous studies–but not with other metabolic variables. Meta-analysis demonstrated a high degree of heterogeneity between study populations of different ethnic origin. Although there was a tendency towards an increased risk of hypertension among 825T allele carriers, this was not statistically significant.

Conclusions/interpretation

The present study suggests no major involvement of the GNB3 825C>T polymorphism in components of the metabolic syndrome.
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Metadata
Title
Studies of the association of the GNB3 825C>T polymorphism with components of the metabolic syndrome in white Danes
Authors
G. Andersen
J. Overgaard
A. Albrechtsen
C. Glümer
K. Borch-Johnsen
T. Jørgensen
T. Hansen
O. Pedersen
Publication date
01-01-2006
Publisher
Springer-Verlag
Published in
Diabetologia / Issue 1/2006
Print ISSN: 0012-186X
Electronic ISSN: 1432-0428
DOI
https://doi.org/10.1007/s00125-005-0049-7

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