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01.09.2006 | Article

Studies of the relationship between the ENPP1 K121Q polymorphism and type 2 diabetes, insulin resistance and obesity in 7,333 Danish white subjects

verfasst von: N. Grarup, S. A. Urhammer, J. Ek, A. Albrechtsen, C. Glümer, K. Borch-Johnsen, T. Jørgensen, T. Hansen, O. Pedersen

Erschienen in: Diabetologia | Ausgabe 9/2006

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Abstract

Aims/hypothesis

Plasma cell membrane glycoprotein 1 (PC-1) inhibits insulin signalling by direct interaction with the insulin receptor α subunit. This inhibition is enhanced by the minor Q allele of the K121Q polymorphism (rs1044498) in the gene (ENPP1) encoding PC-1. This polymorphism has been studied in relation to insulin resistance, type 2 diabetes and obesity in several populations with conflicting results. We assessed the impact of the ENPP1 K121Q polymorphism on type 2 diabetes, obesity and quantitative metabolic traits in 7,333 Danes.

Subjects and methods

The K121Q polymorphism was genotyped in the population-based Inter99 study cohort (5,961 subjects) and in a group of 1,386 patients with type 2 diabetes. All subjects were Danish whites.

Results

No significant associations with type 2 diabetes or related quantitative metabolic traits, including measures of insulin resistance, were detected. However, a meta-analysis of the present and published studies revealed an association with type 2 diabetes (odds ratio per Q allele, 1.17 [95% CI 1.10–1.25], p=1×10⁻⁶). In case–control studies comparing subjects of different BMI strata, we observed a putative association of the codon 121 QQ genotype with being overweight (BMI>25 kg/m²; odds ratio 1.63 [95% CI 1.09–2.46], p=0.015), an association not observed when comparing other levels of BMI or when analysing BMI as a quantitative trait.

Conclusions/interpretation

In a meta-analysis, the ENPP1 codon 121 Q allele associates with type 2 diabetes. However, a similar association was not found in the present study of Danish white subjects. The effect of this variant on obesity in Danish subjects is contentious and further study is needed.

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Titel: Studies of the relationship between the ENPP1 K121Q polymorphism and type 2 diabetes, insulin resistance and obesity in 7,333 Danish white subjects
verfasst von: N. Grarup
S. A. Urhammer
J. Ek
A. Albrechtsen
C. Glümer
K. Borch-Johnsen
T. Jørgensen
T. Hansen
O. Pedersen
Publikationsdatum: 01.09.2006
Verlag: Springer-Verlag
Erschienen in: Diabetologia / Ausgabe 9/2006
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-006-0353-x

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Aims/hypothesis

Subjects and methods

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