title: Association of brain-derived neurotrophic factor genetic Val66Met polymorphism with severity of depression, efficacy of fluoxetine and its side effects in Chinese major depressive patients.
abstract: BACKGROUND
  Preclinical studies have shown that brain-derived neurotrophic factor (BDNF) may be involved in antidepressant action, and the BDNF gene has been suggested to be involved in the pharmacological treatment of major depressive disorder (MDD). In this study, the relationship between BDNF Val66Met polymorphism (Single Nucleotide Polymorphism Database ID: rs6265) and severity of depression, efficacy of fluoxetine and its side effects was tested in Chinese patients with MDD.
  
  
  METHODS
  Patients with MDD took the oral selective serotonin reuptake inhibitor (SSRI) fluoxetine (20 mg/day) for 6 weeks. Its clinical efficacy and side effects were measured by the 17-item Hamilton Rating Scale for Depression and the Treatment-Emergent Symptoms Scale (TESS), respectively. The patients were genotyped for Val66Met polymorphism of the BDNF gene.
  
  
  RESULTS
  In the multivariate regression analysis, there was no significant association between severity of depression and BDNF Val66Met polymorphism. There was no association between efficacy of fluoxetine and BDNF Val66Met polymorphism, but there was a marginal positive suggestion that heterozygous patients tended to have a better remission with fluoxetine in comparison with homozygous analogs. Insomnia and decreased sexual desire, side effects of fluoxetine, may have an association with the BDNF Val66Met polymorphism, and Met allele carriers showed a lower incidence of these side effects.
  
  
  CONCLUSIONS
  These results indicate that there was a lack of association between severity of depression and BDNF Val66Met polymorphism in Chinese patients with MDD. The BDNF Val66Met polymorphism may play a major role in the efficacy and side effects of SSRI (fluoxetine) in Chinese patients with MDD.
authors.affiliation: Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, China.
authors.forename: Yan-Feng
authors.initials: YF
authors.lastname: Zou
authors.forename: Yu
authors.initials: Y
authors.lastname: Wang
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
authors.forename: Xiao-Liang
authors.initials: XL
authors.lastname: Feng
authors.forename: Bin-Yan
authors.initials: BY
authors.lastname: Wang
authors.forename: Tong-Hua
authors.initials: TH
authors.lastname: Zang
authors.forename: Xin
authors.initials: X
authors.lastname: Yu
authors.forename: Jing
authors.initials: J
authors.lastname: Wei
authors.forename: Zhong-Chun
authors.initials: ZC
authors.lastname: Liu
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Ming
authors.initials: M
authors.lastname: Tao
authors.forename: Hui-Chun
authors.initials: HC
authors.lastname: Li
authors.forename: Ke-Qing
authors.initials: KQ
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Hu
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Ke-Rang
authors.initials: KR
authors.lastname: Zhang
authors.forename: Dong-Qing
authors.initials: DQ
authors.lastname: Ye
authors.forename: Xi-Ping
authors.initials: XP
authors.lastname: Xu
mesh_terms: D000328:Adult; D018687:Antidepressive Agents, Second-Generation / Q000627:therapeutic use*; D044466:Asian People / Q000235:genetics; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D003865:Major Depressive Disorder / Q000188:drug therapy* / Q000235:genetics*; D005260:Female; D005473:Fluoxetine / Q000627:therapeutic use*; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008297:Male; D008715:Methionine / Q000235:genetics*; D008875:Middle Aged; D010597:Pharmacogenetics; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D014633:Valine / Q000235:genetics*; D055815:Young Adult
chemical_list: D018687:Antidepressive Agents, Second-Generation; D019208:Brain-Derived Neurotrophic Factor; D005473:Fluoxetine; D008715:Methionine; D014633:Valine