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Preliminary findings on the influence of FTO rs9939609 and MC4R rs17782313 polymorphisms on resting energy expenditure, leptin and thyrotropin levels in obese non-morbid premenopausal women

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Abstract

Given that leptin, ghrelin and thyrotropin play a major role in the regulation of resting energy expenditure (REE) and that the FTO rs9939609 and the MC4R rs17782313 polymorphisms have been proposed to affect energy homeostasis, we hypothesized that both polymorphisms are associated with REE and that these relationships can be mediated by leptin, ghrelin and thyrotropin in obesity. Therefore, the present study aimed to examine the relationships between FTO rs9939609 and the MC4R rs17782313 with REE, leptin, ghrelin and thyrotropin levels in obese women. The study comprised 77 obese (body mass index 34.0 ± 2.8 kg/m2) women (age 36.7 ± 7 years). We measured body composition by dual-energy X-ray absorptiometry and REE by indirect calorimetry. We analysed fasting leptin, ghrelin and thyrotropin levels and the ratio of leptin to fat mass was calculated. Genotype distributions of the polymorphisms did not deviate from Hardy–Weinberg expectations (P values >0.2). Women carrying the A allele of the FTO rs9939609 had lower REE (1,580 ± 22 vs. 1,739 ± 35 kcal/day, P < 0.001) and higher leptin to fat mass ratio (1.33 ± 0.05 vs. 1.13 ± 0.08 ng/ml kg, P < 0.05) and thyrotropin levels (1.93 ± 0.10 vs. 1.53 ± 0.16 μU/ml, P < 0.05) regardless of age and body mass index. We found no significant influence of the MC4R rs17782313 on energy metabolism or biochemical variables. Our findings confirm that the A allele of the FTO rs9939609 is associated with lower REE and increased plasma leptin levels. We also found an association between the FTO rs9939609 and thyrotropin, suggesting the possible influence of FTO in the hypothalamic–pituitary–thyroid axis as a potential mechanism of the increased adiposity.

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Acknowledgments

We thank the women for their participation in the study and Raquel Ares, Silvia Francisco, Izaskun Felipe and Emilio Sanz for their contribution to the participant’s recruitment and medical supervision of the study. This study was supported by the University of the Basque Country (UPV 05/80), Social Foundation of the Caja Vital-Kutxa and by the Department of Health of the Government of the Basque Country (2008/111062).

Compliance with ethics guidelines

The study was in accordance with the Helsinki II Declaration, as revised in 2000 and was approved by the Ethical Committee of the Hospital of Txagorritxu (Vitoria, Spain). All participants received verbal and written information about the nature and purpose of the study, and all of them gave written consent to participate.

Conflict of interest

Maria Arrizabalaga, Eider Larrarte, Javier Margareto, Sara Maldonado, Lourdes Barrenetxea and Idoia Labayen declare that they have no conflict of interest.

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Correspondence to Idoia Labayen.

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Arrizabalaga, M., Larrarte, E., Margareto, J. et al. Preliminary findings on the influence of FTO rs9939609 and MC4R rs17782313 polymorphisms on resting energy expenditure, leptin and thyrotropin levels in obese non-morbid premenopausal women. J Physiol Biochem 70, 255–262 (2014). https://doi.org/10.1007/s13105-013-0300-5

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  • DOI: https://doi.org/10.1007/s13105-013-0300-5

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