DRD2 and BDNF Polymorphisms Are Associated With Binge Eating Disorder (BED) in Patients With Weight Regain After Bariatric Surgery

Abstract

Objectives: Verify the frequency of polymorphisms related to obesity and Binge Eating Disorder (BED) in DRD2 and BDNF genes in patients undergoing bariatric surgery with weight regain above 10% of the weight lost. Methods: Evaluation of 177 individuals undergoing bariatric surgery with weight regain, divided into two groups: Group 1: individuals with BED; Group 2: individuals without BED. The individuals were submitted to anthropometric evaluation, analysis of the presence of BED using a validated questionnaire, and blood collection for genotyping of the polymorphisms, rs6265 (BDNF) and rs1800497 (DRD2). The Kolmogorovi-Smirnov, t-test, chi-square, Mann Whitney, Pearson correlation were used for statistical analysis. Results: CC genotypes for rs1800497 polymorphism, and GG for rs6265 polymorphism were more frequent in patients without the disorder. The presence of at least one T allele (DRD2) and at least one A allele (BDNF) was more frequent in patients with BED. The combination of AA + GA + TT + TC genotypes prevailed in patients with the disorder. Conclusions: The CC (DRD2) and GG (BDNF) genotypes suggest protection for patients against BED, while genotypes that have at least one T allele (DRD2) and one A allele (BDNF) suggest greater risk and appear to act in synergism.Level of evidence: III (evidence obtained from case-control analytic study).