title: BDNF gene is a genetic risk factor for schizophrenia and is related to the chlorpromazine-induced extrapyramidal syndrome in the Chinese population.
abstract: BACKGROUND
  Brain-derived neurotrophic factor (BDNF) belongs to a family of the neurotrophin, which plays important roles in the neurodevelopment of dopaminergic-related systems and interacts with meso-limbic dopaminergic systems involved in the therapeutic response to antipsychotics. Functional experiments have suggested that BDNF may be involved in the etiology of schizophrenia.
  
  
  RESULTS
  In this study, we genotyped two important functional polymorphisms in the BDNF gene using a sample of Han Chinese patients consisting of 340 schizophrenic patients and 343 healthy controls. We found a statistical difference in the 232-bp allele distribution of the BDNF gene (GT)n dinucleotide repeat polymorphism between the schizophrenic patients and controls. In early onset patients, the 234-bp allele had a risk role. For the chlorpromazine-induced extrapyramidal syndrome, the 230-bp allele and the 234-bp allele acted in opposite directions, that is, patients with the 230-bp allele of the (GT)n polymorphism exhibited a lower degree of induced extrapyramidal syndrome. Haplotype-based analysis also revealed a very important risk haplotype (P=0.0000226546).
  
  
  CONCLUSIONS
  These findings suggest that BDNF plays an important role in the susceptibility to schizophrenia and that the (GT)n repeat polymorphism of the BDNF gene may be an independent contributor to the chlorpromazine treatment-sensitive form of schizophrenia.
authors.affiliation: Bio-X Life Science Research Centre, Shanghai Jiao Tong University, PR China. mingqingxu@gmail.com
authors.forename: Ming-Qing
authors.initials: MQ
authors.lastname: Xu
authors.forename: David
authors.initials: D
authors.lastname: St Clair
authors.forename: Guo-Yin
authors.initials: GY
authors.lastname: Feng
authors.forename: Zhi-Guang
authors.initials: ZG
authors.lastname: Lin
authors.forename: Guang
authors.initials: G
authors.lastname: He
authors.forename: Xingwang
authors.initials: X
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: He
mesh_terms: D000328:Adult; D000483:Alleles; D014150:Antipsychotic Agents / Q000009:adverse effects*; D044466:Asian People / Q000235:genetics*; D001480:Basal Ganglia Diseases / Q000139:chemically induced* / Q000235:genetics*; D001483:Base Sequence; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D016022:Case-Control Studies; D002681:China; D002746:Chlorpromazine / Q000009:adverse effects*; D017931:DNA Primers / Q000235:genetics; D018900:Dinucleotide Repeats; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006801:Humans; D008297:Male; D008875:Middle Aged; D010597:Pharmacogenetics; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D012559:Schizophrenia / Q000188:drug therapy* / Q000235:genetics*; D013577:Syndrome
chemical_list: D014150:Antipsychotic Agents; D019208:Brain-Derived Neurotrophic Factor; D017931:DNA Primers; D002746:Chlorpromazine