Impact of Common Polymorphisms in Candidate Genes for Insulin Resistance and Obesity on Weight Loss of Morbidly Obese Subjects after Laparoscopic Adjustable Gastric Banding and Hypocaloric Diet

• Published in: The journal of clinical endocrinology and metabolism 2005-09, Vol.90 (9), p.5064-5069
• Main Authors: Sesti, Giorgio, Perego, Lucia, Cardellini, Marina, Andreozzi, Francesco, Ricasoli, Cristina, Vedani, Paola, Guzzi, Valeria, Marchi, Monica, Paganelli, Michele, Ferla, Gianfranco, Pontiroli, Antonio E., Hribal, Marta Letizia, Folli, Franco
• Format: Article
• Language: English
• Subjects: Adult; Biological and medical sciences; Diet, Reducing; Endocrinopathies; Female; Follow-Up Studies; Fundamental and applied biological sciences. Psychology; Gastroplasty; Heterozygote; Humans; Insulin Receptor Substrate Proteins; Insulin Resistance - genetics; Interleukin-6 - genetics; Ion Channels; Male; Medical sciences; Membrane Transport Proteins - genetics; Middle Aged; Mitochondrial Proteins - genetics; Obesity, Morbid - genetics; Obesity, Morbid - surgery; Phosphoproteins - genetics; Polymorphism, Single Nucleotide; Postoperative Period; PPAR gamma - genetics; Uncoupling Protein 2; Vertebrates: endocrinology; Weight Loss - genetics
• ISSN: 0021-972X; 1945-7197
• DOI: 10.1210/jc.2005-0404

Context: It is unknown whether genetic factors that play an important role in body weight homeostasis influence the response to laparoscopic adjustable gastric banding (LAGB). Objective: We investigated the impact of common polymorphisms in four candidate genes for insulin resistance on weight loss after LAGB. Design: The design was a 6-month follow-up study. Setting: The study setting was hospitalized care. Patients: A total of 167 unrelated morbidly obese subjects were recruited according to the following criteria: age, 18–66 yr inclusive; and body mass index greater than 40 kg/m2 or greater than 35.0 kg/m2 in the presence of comorbidities. Intervention: LAGB was used as an intervention. Main Outcome Measure: Measure of correlation between weight loss and common polymorphisms in candidate genes for insulin resistance and obesity was the main outcome measure. Results: The following single nucleotide polymorphisms were detected by digestion of PCR products with appropriate restriction enzymes: Gly972Arg of the insulin receptor substrate-1 gene, Pro12Ala of the proliferator-activated receptor-γ gene, C-174G in the promoter of IL-6 gene, and G-866A in the promoter of uncoupling protein 2 gene. Baseline characteristics including body mass index did not differ between the genotypes. At the 6-month follow-up after LAGB, carriers of G-174G IL-6 genotype had lost more weight than G-174C or C-174C genotype (P = 0.037), and carriers of A-866A uncoupling protein 2 genotype had lost more weight as compared with G-866G (P = 0.018) and G-866A (P = 0.035) genotype, respectively. Weight loss was lower in carriers of Gly972Arg insulin receptor substrate-1 genotype than Gly972Gly carriers, but not statistically significant (P = 0.06). No difference between carriers of Pro12Ala and Pro12Pro proliferator-activated receptor-γ genotype was observed. Conclusions: These data demonstrate that genetic factors, which play an important role in the regulation of body weight, may account for differences in the therapeutic response to LAGB.