Genetic Study of the Melanin-Concentrating Hormone Receptor 2 in Childhood and Adulthood Severe Obesity Academic Article uri icon

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  • CONTEXT: The melanin-concentrating hormone receptor 2 (MCHR2) is a G protein-coupled receptor for melanin-concentrating hormone, a neuropeptide that plays an important role in feeding behaviors. MCHR2 maps on chromosome 6q16.3, in a susceptibility locus for childhood obesity. OBJECTIVE: The aim of this study was to investigate the association between MCHR2 variation and human obesity. DESIGN: Case control and family-based studies were performed. PARTICIPANTS: A total of 141 obese children and 24 nonobese adult subjects was sequenced, and case-control analyses were conducted using 628 severely obese children and 1,401 controls. RESULTS: There were 11 single nucleotide polymorphisms (SNPs) identified. We showed nominal association among -38,245 ATG A/G SNP (P = 0.03; 95% confidence interval 1.02-1.34; odds ratio 1.17), A76A T/C SNP (P = 0.03; 95% confidence interval 0.58-0.97; odds ratio 0.75), and childhood obesity. Analysis of 645 trios with childhood obesity supported further the A76A T/C association, showing an overtransmission to obese children of the at risk T allele (59.0%; P = 0.01), especially in children with most severe forms of obesity (Z score of body mass index > 4) (67.0%; P = 0.003). The A76A at risk T allele was also associated with overeating during meals (P = 0.02) in an additional group of 102 nonobese children. None of the MCHR2 variants, including the A76A SNP, showed association with adult severe obesity, although a trend for association of the T allele of this variant with food disinhibition (P = 0.06) and higher hunger (P = 0.09) was found. This variant was not associated with childhood obesity in an independent case-control study, including 1,573 subjects (P = 0.98). Moreover, the A76A SNP did not explain the linkage on the 6q locus. CONCLUSION: Our results altogether suggest that MCHR2 is not a major contributor to polygenic obesity and support a modest effect of the A76A SNP on food intake abnormalities in childhood.


  • Ghoussaini, Maya
  • Vatin, Vincent
  • Lecoeur, Cécile
  • Abkevich, Victor
  • Younus, Adib
  • Samson, Chantal
  • Wachter, Christophe
  • Heude, Barbara
  • Tauber, Maïté
  • Tounian, Patrick
  • Hercberg, Serge
  • Weill, Jacques
  • Levy-Marchal, Claire
  • Le Stunff, Catherine
  • Bougnères, Pierre
  • Froguel, Philippe
  • Meyre, David Jean-Claude

publication date

  • November 1, 2007

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