Genetic associations with neural reward responsivity to food cues in children

Area of Science:

• Neuroscience
• Genetics
• Pediatric Obesity Research

Background:

• Obesity is a complex condition influenced by genetic and environmental factors.
• Neural reward pathways play a crucial role in food intake and appetite regulation.
• Understanding genetic predispositions to reward sensitivity is vital for obesity prevention strategies.

Purpose of the Study:

• To investigate the association between specific obesity-related genetic variants and polygenic risk scores (PRS) with neural reward system activity in response to food cues.
• To explore how genetic risk for obesity relates to brain responses to food stimuli in children after a meal.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity in 151 children (aged 9-12) exposed to food and non-food cues.
• Genetic analyses included the FTO rs9939609 and MC4R rs571312 SNPs, and a pediatric obesity PRS.
• Linear models assessed associations between genetic factors and reward responsivity in targeted reward regions and whole-brain analyses.

Main Results:

• The FTO rs9939609 risk allele showed a trend towards increased response in the right lateral hypothalamus to food cues in the sated state (p < 0.01), though not significant after multiple testing correction.
• No significant associations were found for MC4R rs571312 or the obesity PRS with heightened food-cue-related reward responsivity.
• Whole-brain analysis did not reveal additional genetic associations with food-cue reward responses.

Conclusions:

• Children with the FTO obesity risk allele may exhibit heightened neural reward responsivity to food cues when satiated.
• This genetic predisposition could potentially influence overconsumption and contribute to obesity development.
• Further research is needed to confirm these findings and explore underlying mechanisms.