Abstract
OBJECTIVE:
Overexpression of the human transcription factor FOXC2 gene (FOXC2) protects against insulin resistance in mice and a common FOXC2 polymorphism (–512C>T) has been suggested to be associated with insulin resistance in humans. Here, we addressed the potential role for FOXC2 as a candidate gene for type 2 diabetes and associated phenotypes.
MATERIALS AND METHODS:
A case–control study was performed in 390 type 2 diabetic patients and 307 control subjects. The number of patients was increased to a total of 768 subjects for further study of phenotypic differences relating to the dysmetabolic syndrome relative to genetic variation. The FOXC2 –512C>T polymorphism was genotyped by a restriction fragment length polymorphism PCR assay.
RESULTS:
FOXC2 –512C>T allele and genotype distribution did not differ between patients with type 2 diabetes and control subjects, but the C/C genotype was associated with increased body mass index (BMI, kg/m2) (Pa=0.03) among type 2 diabetic patients. The FOXC2 –512C>T polymorphism was a significant independent predictor of BMI (P=0.001) in a multiple regression model including age, gender and affection status. We found no significant association with type 2 diabetes-related metabolic parameters but that the C-allele (P=0.01) and C/C and C/T genotypes (P=0.03) were significantly over-represented in type 2 diabetic males with a concomitant diagnosis of dysmetabolic syndrome.
CONCLUSION:
We conclude that FOXC2 is associated with obesity and metabolic deterioration but does not contribute to an increased risk for type 2 diabetes.
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Acknowledgements
This investigation was funded by the Crafoord Foundation, Malmö University Hospital Foundation, the Albert Påhlsson Foundation, the Swedish Medical Research Counsil, the Diabetes Association in Malmö, the Juvenile Diabetes-Wallenberg Foundation, the Lundberg Foundation, EC-GIFT, the Novo Nordisk Foundation, Region Skåne, ALF, the Magnus Bergvall Foundation, the Fredrik and Ingrid Thurings Foundation and the Borgströms Foundation. We are greatly indebted to the study subjects for their participation.
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Carlsson, E., Groop, L. & Ridderstråle, M. Role of the FOXC2 –512C>T polymorphism in type 2 diabetes: possible association with the dysmetabolic syndrome. Int J Obes 29, 268–274 (2005). https://doi.org/10.1038/sj.ijo.0802876
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DOI: https://doi.org/10.1038/sj.ijo.0802876
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