title: Genetic variation in the peroxisome proliferator-activated receptor-gamma2 gene (Pro12Ala) affects metabolic responses to weight loss and subsequent weight regain.
abstract: This study determined the effects of the peroxisome proliferator-activated receptor (PPAR)-gamma2 Pro12Ala variant on body composition and metabolism and the magnitude of weight regain in 70 postmenopausal women (BMI 25-40 kg/m(2)) who completed 6 months of a hypocaloric diet. At baseline, BMI, percent body fat, intra-abdominal and subcutaneous abdominal fat areas, resting metabolic rate, substrate oxidation, and postprandial glucose and insulin responses were not different between genotypes (Pro/Pro = 56, Pro/Ala and Ala/Ala = 14). The intervention similarly decreased body weight by 8 +/- 1% in women homozygous for the Pro allele and by 7 +/- 1% in women with the Ala allele (P < 0.0001). Fat oxidation did not change in Pro/Pro women but decreased 19 +/- 9% in women with the Ala allele (P < 0.05). Changes in glucose area were not different between groups; however, women with the Ala allele decreased their insulin area more than women homozygous for the Pro allele (P < 0.05). Weight regain during follow-up was greater in women with the Ala allele than women homozygous for the Pro allele (5.4 +/- 0.9 vs. 2.8 +/- 0.4 kg, P < 0.01). PPAR-gamma2 genotype was the best predictor of weight regain (r = 0.50, P < 0.01), followed by the change in fat oxidation (partial r = 0.35, P < 0.05; cumulative r = 0.58). Thus, the Pro12Ala variant of the PPAR-gamma2 gene may influence susceptibility for obesity.
authors.affiliation: University of Maryland School of Medicine, Department of Medicine, Baltimore VA Medical Center, Maryland 21201, USA. bnicklas@umaryland.edu
authors.forename: B J
authors.initials: BJ
authors.lastname: Nicklas
authors.forename: E F
authors.initials: EF
authors.lastname: van Rossum
authors.forename: D M
authors.initials: DM
authors.lastname: Berman
authors.forename: A S
authors.initials: AS
authors.lastname: Ryan
authors.forename: K E
authors.initials: KE
authors.lastname: Dennis
authors.forename: A R
authors.initials: AR
authors.lastname: Shuldiner
mesh_terms: D000595:Amino Acid Sequence / Q000235:genetics; D005260:Female; D005544:Forecasting; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D008660:Metabolism / Q000235:genetics*; D008875:Middle Aged; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*; D015431:Weight Loss / Q000502:physiology*
chemical_list: D018160:Receptors, Cytoplasmic and Nuclear; D014157:Transcription Factors