Abstract
Objective:
Our previous study using the Goto–Kakizaki rat implicates that the adenylyl cyclase 3 (AC3) is a candidate gene for genetic study of metabolic disorders. The present study aimed to investigate the susceptibility of genetic variation of the AC3 gene in type 2 diabetes (T2D) patients and obese subjects.
Subjects and methods:
Variation screening in the putative promoter and validation of single nucleotide polymorphisms (SNPs) covering the AC3 gene were performed. In total, 630 Swedish men, including 243 T2D patients (BMI from 18.4 to 45.6 kg m−2), 199 obese subjects with normal glucose tolerance (NGT, BMI⩾30 kg m−2) and 188 control subjects (NGT, BMI⩽26 kg m−2), were genotyped.
Results:
A novel variant -17A/T in the promoter was identified, but no significant association of this polymorphism with T2D was found. SNPs rs2033655 C/T and rs1968482 A/G were found to be significantly associated with obesity when T2D patients had BMI⩾30 kg m−2 (P=0.003 and 0.005). The significance was borderline in T2D patients with BMI<30 kg m−2 (P=0.051 and 0.084) and disappeared in T2D patients with BMI⩽26 kg m−2. Importantly, analysis in obese subjects with NGT demonstrated that these two polymorphisms were strongly associated with obesity per se (P=0.028 and 0.003). Furthermore, analyses for diplotypes (haplotypic genotypes) predicted an association with BMI in obese subjects.
Conclusions:
The present study provides the first evidence that AC3 polymorphisms confer the risk susceptibility to obesity in Swedish men with and without type 2 diabetes.
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Acknowledgements
We thank Drs Oluf Pedersen and Torben Hansen for valuable discussion and comment, Dr Ralf Morgenstern for the support with DASH instrument, Ms Yvonne Strömberg for excellent laboratory assistance and all subjects for participating in the present study. The work was supported by Novo Nordic Consortium, Swedish Research Council, Novo Nordisk Scandinavia, Glaxo Smith Kline, Vetenskapligt arbete inom diabetologi foundation, Loo and Hans Osterman foundation and Swedish Diabetes Association.
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Supplementary Information accompanies the paper on International Journal of Obesity website (http://www.nature.com/ijo)
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Nordman, S., Abulaiti, A., Hilding, A. et al. Genetic variation of the adenylyl cyclase 3 (AC3) locus and its influence on type 2 diabetes and obesity susceptibility in Swedish men. Int J Obes 32, 407–412 (2008). https://doi.org/10.1038/sj.ijo.0803742
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DOI: https://doi.org/10.1038/sj.ijo.0803742
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