TY - JOUR
T1 - Energy intake and energy expenditure among children with polymorphisms of the melanocortin-3 receptor
AU - Savastano, David M.
AU - Tanofsky-Kraff, Marian
AU - Han, Joan C.
AU - Ning, Cong
AU - Sorg, Rachael A.
AU - Roza, Caroline A.
AU - Wolkoff, Laura E.
AU - Anandalingam, Kavitha
AU - Jefferson-George, Kyra S.
AU - Figueroa, Roberto E.
AU - Sanford, Ethan L.
AU - Brady, Sheila
AU - Kozlosky, Merel
AU - Schoeller, Dale A.
AU - Yanovski, Jack A.
PY - 2009/10/1
Y1 - 2009/10/1
N2 - Background: Homozygosity for 2 protein-altering polymorphisms in the melanocortin-3 receptor gene (MC3R) coding sequence, C17A and G241A, has been reported to be associated with an obesity phenotype in children, yet how these polymorphisms affect energy homeostasis is unknown. Association between adult body weight and +2138InsCAGACC, another variant in the 3′ untranslated region of MC3R, has also been described. Objective: The objective of this study was to examine associations of C17A + G241A and +2138InsCAGACC MC3R variants with children's energy balance. Design: Children aged 6-19 y were genotyped for MC3R C17A, G241A, and +2138InsCAGACC. Subjects underwent studies of energy intake from a 9835-kcal food array (n = 185), resting energy expenditure (REE) by using indirect calorimetry (n = 302), or total daily energy expenditure (TEE) by using doubly labeled water (n = 120). Linear regression was used to examine the associations between MC3R polymorphisms and the measures of energy balance. Results: Body mass index and fat mass were greater in those with double homozygosity for C17A + G241A (P = 0.001). After accounting for covariates (including body composition), the number of minor C17A + G241A alleles was associated with significantly greater energy intake (β = +0.15, P = 0.02) but not altered REE or TEE. No significant associations were observed between +2138InsCAGACC and measures of either fat mass or energy balance. Conclusions: C17A + G241A polymorphisms may be associated with pediatric obesity because of greater energy intake rather than because of diminished energy expenditure. +2138InsCAGACC does not appear to be associated with obesity or measures of energy balance in children.
AB - Background: Homozygosity for 2 protein-altering polymorphisms in the melanocortin-3 receptor gene (MC3R) coding sequence, C17A and G241A, has been reported to be associated with an obesity phenotype in children, yet how these polymorphisms affect energy homeostasis is unknown. Association between adult body weight and +2138InsCAGACC, another variant in the 3′ untranslated region of MC3R, has also been described. Objective: The objective of this study was to examine associations of C17A + G241A and +2138InsCAGACC MC3R variants with children's energy balance. Design: Children aged 6-19 y were genotyped for MC3R C17A, G241A, and +2138InsCAGACC. Subjects underwent studies of energy intake from a 9835-kcal food array (n = 185), resting energy expenditure (REE) by using indirect calorimetry (n = 302), or total daily energy expenditure (TEE) by using doubly labeled water (n = 120). Linear regression was used to examine the associations between MC3R polymorphisms and the measures of energy balance. Results: Body mass index and fat mass were greater in those with double homozygosity for C17A + G241A (P = 0.001). After accounting for covariates (including body composition), the number of minor C17A + G241A alleles was associated with significantly greater energy intake (β = +0.15, P = 0.02) but not altered REE or TEE. No significant associations were observed between +2138InsCAGACC and measures of either fat mass or energy balance. Conclusions: C17A + G241A polymorphisms may be associated with pediatric obesity because of greater energy intake rather than because of diminished energy expenditure. +2138InsCAGACC does not appear to be associated with obesity or measures of energy balance in children.
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U2 - 10.3945/ajcn.2009.27537
DO - 10.3945/ajcn.2009.27537
M3 - Article
C2 - 19656839
AN - SCOPUS:70349785440
SN - 0002-9165
VL - 90
SP - 912
EP - 920
JO - American Journal of Clinical Nutrition
JF - American Journal of Clinical Nutrition
IS - 4
ER -