Effect of the Ala12 allele in the PPARgamma-2 gene on the relationship between birth weight and body composition in adolescents: the AVENA study.
The intent of this study was to assess whether the effect of birth weight on later body composition is modified by Pro12Pro, Pro12Ala, and Ala12Ala genotypes of the peroxisome proliferator-activated receptor gamma-2 (PPARgamma-2) gene. The PPARgamma-2 gene polymorphism was genotyped in 273 adolescents aged 13-18.5 y, born at term and whose birth weight was known. They were selected from a cross-sectional multicenter study conducted in five Spanish cities in 2000-2002. Body mass index (BMI) was calculated from weight and height measurements, and body composition and fat distribution were estimated from skinfold thickness. A total of 229 subjects (111 males and 118 females) carried the Pro12Pro genotype and 44 (22 males and 22 females) the Pro12Ala and Ala12Ala PPARgamma-2 genotypes. In the Pro12Pro group, birth weight Z score was positively associated with both fat-free mass (FFM) (p < 0.05) and fat mass (FM) (p < 0.05), but these relationships disappeared after controlling for age, gestational age, socioeconomic status (SES), physical activity, Tanner stage, sex, and BMI. In the Ala12 group, birth weight Z score was positively associated with FFM (p < 0.01), and this relationship remained significant after controlling for confounding variables (p < 0.05). Small body weight at birth may program lower FFM in adolescents carrying the Ala12 allele in the PPARgamma-2 gene.
Labayen
Idoia
I
Department of Nutrition and Food Science, University of the Basque Country, 01006 Vitoria, Spain. idoya.labayen@ehu.es
Moreno
Luis A
LA
Marti
Amelia
A
González-Lamuño
Domingo
D
Wärnberg
Julia
J
Ortega
Francisco B
FB
Bueno
Gloria
G
Nova
Esther
E
Ruiz
Jonatan R
JR
Garagorri
Jesús M
JM
Martínez
J Alfredo
JA
García-Fuentes
Miguel
M
Bueno
Manuel
M
D000293:Adolescent; D000409:Alanine; D001724:Birth Weight / Q000235:genetics*; D001823:Body Composition / Q000235:genetics*; D050218:Body Fat Distribution; D001827:Body Height / Q000235:genetics; D015992:Body Mass Index; D001835:Body Weight / Q000235:genetics; D003430:Cross-Sectional Studies; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D047495:PPAR gamma / Q000235:genetics*; D011392:Proline; D012885:Skinfold Thickness; D013030:Spain