Association between MC4R rs17782313 polymorphism and overeating behaviors

Int J Obes (Lond). 2015 Jan;39(1):114-20. doi: 10.1038/ijo.2014.79. Epub 2014 May 14.

Abstract

Background/objectives: Melanocortins have a crucial role in appetite and weight regulation. Although the melanocortin 4 receptor (MC4R) gene has been repeatedly linked to obesity and antipsychotic-induced weight gain, the mechanism behind how it leads to this effect in still undetermined. The goal of this study was to conduct an in-depth and sophisticated analysis of MC4R polymorphisms, body mass index (BMI), eating behavior and depressed mood.

Subjects/methods: We genotyped 328 individuals of European ancestry on the following MC4R markers based on the relevant literature on obesity and antipsychotic-induced weight gain: rs571312, rs17782313, rs489693, rs11872992, and rs8087522. Height and weight were measured, and information on depressed mood and overeating behaviors was obtained during the in-person assessment.

Results: BMI was associated with rs17782313 C allele; however, this finding did not survive correction for multiple testing (P = 0.018). Although rs17782313 was significantly associated with depressed mood and overeating behaviors, tests of indirect effects indicated that emotional eating and food cravings, rather than depressed mood, uniquely accounted for the effect of this marker and BMI (n = 152).

Conclusions: To our knowledge, this is the first study to investigate the link between MC4R rs17782313, mood and overeating behavior, as well as to demonstrate possible mechanisms behind MC4R's influence on body weight. If replicated in a larger sample, these results may have important clinical implications, including potential for the use of MC4R agonists in the treatment of obesity and disordered eating.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Alleles
  • Antipsychotic Agents / adverse effects
  • Body Mass Index
  • Depression* / genetics
  • European Continental Ancestry Group* / genetics
  • Feeding Behavior* / psychology
  • Female
  • Genetic Predisposition to Disease
  • Humans
  • Hyperphagia / genetics*
  • Hyperphagia / psychology
  • Male
  • Middle Aged
  • Polymorphism, Single Nucleotide / genetics*
  • Receptor, Melanocortin, Type 4 / genetics*
  • Risk Factors
  • Surveys and Questionnaires
  • Weight Gain / genetics

Substances

  • Antipsychotic Agents
  • MC4R protein, human
  • Receptor, Melanocortin, Type 4