Effect of the Melanocortin 4-Receptor Ile269Asn Mutation on Weight Loss Response to Dietary, Phentermine and Bariatric Surgery Interventions

• Published in: Genes Vol. 13; no. 12; p. 2267
• Main Authors: Salazar-Valencia, Itzel G, Villamil-Ramírez, Hugo, Barajas-Olmos, Francisco, Guevara-Cruz, Martha, Macias-Kauffer, Luis R, García-Ortiz, Humberto, Hernández-Vergara, Omar, Díaz de Sandy-Galán, David Alberto, León-Mimila, Paola, Centeno-Cruz, Federico, González-Salazar, Luis E, Guizar-Heredia, Rocío, Pichardo-Ontiveros, Edgar, Jacobo-Albavera, Leonor, Posadas-Sánchez, Rosalinda, Vargas-Alarcón, Gilberto, Velazquez-Cruz, Rafael, Gutiérrez-Aguilar, Ruth, Zerrweck, Carlos, Rocha-González, Héctor Isaac, Reyes-García, Juan Gerardo, Carrasco-Portugal, Miriam Del C, Flores-Murrieta, Francisco Javier, Tovar, Armando R, Orozco, Lorena, Villarreal-Molina, Teresa, Canizales-Quinteros, Samuel
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.12.2022; MDPI
• Subjects: Adult; Age; Alleles; Bariatric Surgery; Body weight loss; Carbohydrates; Cell receptors; Dietary restrictions; Drug therapy; Exercise; Gastric bypass; Gastrointestinal surgery; Genetic aspects; Glucose; Health aspects; Hispanic Americans; Humans; Ile269Asn-mutation; Insulin resistance; Intervention; interventions; Melanocortin; Melanocortin MC4 receptors; melanocortin-4-receptor; Mutation; Mutation (Biology); Obesity; Obesity - genetics; Obesity - surgery; Patients; Phentermine; Physical fitness; Receptor, Melanocortin, Type 4 - genetics; Surgery; Weight control; Weight Loss - genetics; weight-loss; Mexico; United States > US; Ile269Asn-mutation; weight-loss; interventions; obesity; melanocortin-4-receptor
• ISSN: 2073-4425; 2073-4425
• DOI: 10.3390/genes13122267

The loss of function melanocortin 4-receptor ( ) Ile269Asn mutation has been proposed as one of the most important genetic contributors to obesity in the Mexican population. However, whether patients bearing this mutation respond differently to weight loss treatments is unknown. We tested the association of this mutation with obesity in 1683 Mexican adults, and compared the response of mutation carriers and non-carriers to three different weight loss interventions: dietary restriction intervention, phentermine 30 mg/day treatment, and Roux-en-Y gastric bypass (RYGB) surgery. The Ile269Asn mutation was associated with obesity [OR = 3.8, 95% CI (1.5-9.7), = 0.005]. Regarding interventions, in the dietary restriction group only two patients were Ile269Asn mutation carriers. After 1 month of treatment, both mutation carriers lost weight: -4.0 kg (-2.9%) in patient 1, and -1.8 kg (-1.5%) in patient 2; similar to the mean weight loss observed in six non-carrier subjects (-2.9 kg; -2.8%). Phentermine treatment produced similar weight loss in six carriers (-12.7 kg; 15.5%) and 18 non-carriers (-11.3 kg; 13.6%) after 6 months of pharmacological treatment. RYGB also caused similar weight loss in seven carriers (29.9%) and 24 non-carriers (27.8%), 6 months after surgery. Our findings suggest that while the presence of a single loss of function Ile269Asn allele significantly increases obesity risk, the presence of at least one functional allele seems sufficient to allow short-term weight loss in response to dietary restriction, phentermine and RYGB. Thus, these three different interventions may be useful for the short-term treatment of obesity in Ile269Asn mutation carriers.