title: Lack of effect of brain derived neurotrophic factor (BDNF) Val66Met polymorphism on early onset schizophrenia in Chinese Han population.
abstract: Schizophrenia is a chronic psychiatric disorder with high heritability. Schizophrenic patients with early-age onset tend to have a greater genetic component and may be an attractive subpopulation for genetic studies. Brain-derived neurotrophic factor (BDNF) is considered a candidate gene for schizophrenia. A single nucleotide polymorphism (BDNF Val66Met) was reported to be associated with schizophrenia, although discrepancy remains. The aim of this study was to evaluate the association between BDNF Val66Met polymorphism and schizophrenia using an early onset sample in the Chinese Han population. Our sample consisted of 353 schizophrenic patients with onset before age 18 and 394 healthy controls. All subjects were of an ethnically homogenous Han Chinese origin. No significant differences of genotype or allele distribution were identified between the patients and controls. However, the Met allele was significantly associated with an earlier age of onset in male schizophrenic patients (Kaplan-Meier log-rank test P=0.005), but not in females (P=0.289). The BDNF Val66Met polymorphism has an important effect on the age of onset of schizophrenia in a gender-specific manner. This may represent a significant genetic clue for the etiology of schizophrenia and thus, further studies are required to uncover the exact role of BDNF in the development of schizophrenia.
authors.affiliation: Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, 600 Wan Ping Nan Road, Shanghai 200030, PR China.
authors.forename: Zhenghui
authors.initials: Z
authors.lastname: Yi
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Wu
authors.forename: Wu
authors.initials: W
authors.lastname: Hong
authors.forename: Zezhi
authors.initials: Z
authors.lastname: Li
authors.forename: Yiru
authors.initials: Y
authors.lastname: Fang
authors.forename: Shunying
authors.initials: S
authors.lastname: Yu
mesh_terms: D000293:Adolescent; D017668:Age of Onset; D044466:Asian People / Q000235:genetics; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D016022:Case-Control Studies; D002648:Child; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide; D012559:Schizophrenia / Q000235:genetics*; D012737:Sex Factors
chemical_list: D019208:Brain-Derived Neurotrophic Factor