Body adiposity partially mediates the association between FTO rs9939609 and lower adiponectin levels in Chilean children

Ochoa-Rosales, C., Mardones, L., Villagrán, M., Aguayo, C., Martorell, M., Celis-Morales, C. and Ulloa, N. (2023) Body adiposity partially mediates the association between FTO rs9939609 and lower adiponectin levels in Chilean children. Children, 10(3), 426. (doi: 10.3390/children10030426) (PMID:36979984) (PMCID:PMC10047575)

Abstract

Children carrying the minor allele ‘A’ at the fat mass and obesity-associated protein (FTO) gene have higher obesity prevalence. We examined the link between FTO rs9939609 polymorphism and plasma adiponectin and the mediating role of body adiposity, in a cross-sectional study comprising 323 children aged 6–11 years. Adiponectin and FTO genotypes were assessed using a commercial kit and a real-time polymerase chain reaction with high-resolution melting analysis, respectively. Body adiposity included body mass index z-score, body fat percentage and waist-to-hip ratio. To investigate adiponectin (outcome) associations with FTO and adiposity, linear regressions were implemented in additive models and across genotype categories, adjusting for sex, age and Tanner’s stage. Using mediation analysis, we determined the proportion of the association adiponectin-FTO mediated by body adiposity. Lower adiponectin concentrations were associated with one additional risk allele (βadditive = −0.075 log-μg/mL [−0.124; −0.025]), a homozygous risk genotype (βAA/TT = −0.150 [−0.253; −0.048]) and a higher body mass index z-score (β = −0.130 [−0.176; −0.085]). Similar results were obtained for body fat percentage and waist-to-hip ratio. Body adiposity may mediate up to 29.8% of the FTO-adiponectin association. In conclusion, FTO rs9939609-related differences in body adiposity may partially explain lower adiponectin concentrations. Further studies need to disentangle the biological pathways independent from body adiposity.

• Item Type: Articles
• Additional Information: This research was conducted at Universidad de Concepción, and was funded by the grant INNOVA from the Corporación de Fomento de la Producción CORFO (Production Development Corporation), Chilean Ministry of Economy, Development and Tourism, grant number 07CN131SM196, years 2010–2011.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Celis, Dr Carlos and Ochoa-Rosales, Dr Carolina and Villagran, Dr Marcelo
• Authors: Ochoa-Rosales, C., Mardones, L., Villagrán, M., Aguayo, C., Martorell, M., Celis-Morales, C., and Ulloa, N.
• College/School: College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health
• Journal Name: Children
• Publisher: MDPI
• ISSN: 2227-9067
• ISSN (Online): 2227-9067
• Published Online: 22 February 2023
• Copyright Holders: Copyright © 2023 The Authors
• First Published: First published in Children 10(3): 426
• Publisher Policy: Reproduced under a Creative Commons License