title: [Influence of G308A polymorphism of tumor necrosis factor alpha gene on insulin resistance in obese patients after weight loss].
abstract: OBJECTIVE
  An accumulating body of evidence shows that modest weight loss (5%) through dietary changes and exercices is an effective means for managing obesity-associated disorders. As far as we kow, nobody has described the dietary response in insulin resistance and adipocytokines, analyzing the G308A variant of the tumor necrosis factor alpha (TNF-alpha) gene. The aim of our study was to investigate the influence of G308A polymorphism in the TNF-alpha gene on insulin resistance and weight loss secondary to a hypocaloric diet in obese patients.
  
  
  METHODS
  A population of 69 obese -body mass index (BMI) > 30 kg/m2- non diabetic outpatients was analyzed in a prospective way. Before and after 3 months of life style modification program, tetrapolar electrical bioimpedance, blood pressure, a serial assessment of nutritional intake with 3 days written food records and biochemical analysis were performed. The lifestyle modification program consisted of a hypocaloric diet 1,520 kcal.
  
  
  RESULTS
  Sixty-nine patients completed the follow-up during 3 months, with a weight loss (standard deviation) of 2.96 (3.4) kg (3.3%). Fifty two patients (13 males and 39 females) (75.3%) had the genotype G308/G308 (wild group) with an average age of 44.9 (16.8) years, and 17 patients (5 males and 12 females) (24.7%) had the genotype G308/A308 (mutant group) with an average age of 48.3 (15.2) years, without statistical differences. In mutant type group, BMI, body weight and waist circumference decreased. Mutant type group had higher basal and after treatment weight than wild group.
  
  
  CONCLUSIONS
  Weight loss is associated with different changes depending of TNF-alpha genotype. Carries of G308G variant of TNF-* gene have a better metabolic response than A308 obeses.
authors.affiliation: Instituto de Endocrinología y Nutrición. Facultad de Medicina. Universidad de Valladolid. Unidad de Apoyo a la Investigación. Hospital Universitario Río Hortega. Valladolid. España.
authors.forename: Danielv Antonio
authors.initials: DA
authors.lastname: de Luis
authors.forename: Rocío
authors.initials: R
authors.lastname: Aller
authors.forename: Olazt
authors.initials: O
authors.lastname: Izaola
authors.forename: Manuel
authors.initials: M
authors.lastname: González Sagrado
authors.forename: Rosa
authors.initials: R
authors.lastname: Conde
authors.forename: Enrique
authors.initials: E
authors.lastname: Romero
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007333:Insulin Resistance / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000235:genetics*; D011110:Polymorphism, Genetic; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*; D015431:Weight Loss / Q000235:genetics*
chemical_list: D014409:Tumor Necrosis Factor-alpha