title: Association study of astrocyte-derived protein S100B gene polymorphisms with major depressive disorder in Chinese people.
abstract: OBJECTIVE
  Astroglial-derived protein S100B is known to play important roles in axonal growth, neural plasticity, and energy regulation. Disturbance of these neurodevelopmental processes is proposed as one possible etiology for mood disorder. Therefore, we performed a genetic analysis of S100B in patients with major depressive disorder (MDD).
  
  
  METHODS
  The polymorphisms of S100B were determined by polymerase chain reaction-restriction fragment length polymorphism in patients (n = 152) with MDD and healthy control subjects (n = 150). The genotypic and allelic distributions of 2 variants were analyzed in Chinese patients.
  
  
  RESULTS
  Two single nucleotide polymorphisms did not display significant associations with MDD. However, there were significant differences in age of onset in 3 genotypes of S100B rs9722. Significant differences in the subgroup depression (first-episode and recurrent depression) were also shown in 3 genotypes of S100B rs9722 and rs11911834 in patients and control subjects (P < 0.05).
  
  
  CONCLUSIONS
  Our findings did not suggest association of S100B gene polymorphisms in patients with MDD in China. We found there were differences in depressive episodes among different genotypes of S100B gene.
authors.affiliation: Mental Health Institute of the Second Xiangya Hospital, Central Southern University, Changsha, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Yang
authors.forename: Guang-Rong
authors.initials: GR
authors.lastname: Xie
authors.forename: Yi-Qiu
authors.initials: YQ
authors.lastname: Hu
authors.forename: Fu-Qiang
authors.initials: FQ
authors.lastname: Mao
authors.forename: Lin-Yan
authors.initials: LY
authors.lastname: Su
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000483:Alleles; D044466:Asian People / Q000235:genetics*; D002681:China; D003865:Major Depressive Disorder / Q000175:diagnosis / Q000235:genetics* / Q000523:psychology; D005260:Female; D005787:Gene Frequency / Q000235:genetics; D006580:Genetic Carrier Screening; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005838:Genotype; D006720:Homozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D009414:Nerve Growth Factors / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins / Q000235:genetics*; D055815:Young Adult
chemical_list: D009414:Nerve Growth Factors; D064568:S100 Calcium Binding Protein beta Subunit; D009418:S100 Proteins; C579160:S100B protein, human