title: Association between ST8SIA2 and the Risk of Schizophrenia and Bipolar I Disorder across Diagnostic Boundaries.
abstract: BACKGROUND
  Findings from family studies and recent genome-wide association studies have indicated overlap in the risk genes between schizophrenia and bipolar disorder (BD). After finding a linkage between the ST8SIA2 (ST8 alpha-N-acetyl-neuraminide alpha-2, 8-sicalyltransferase 2 gene) locus (15q26) and mixed families with schizophrenia and BD, several studies have reported a significant association between this gene and schizophrenia or BD. We investigated the genetic association between ST8SIA2 and both schizophrenia and BD in the Korean population.
  
  
  METHODS
  A total of 582 patients with schizophrenia, 339 patients with BD, and 502 healthy controls were included. Thirty-one tag single nucleotide polymorphisms (SNPs) across the ST8SIA2 region and three other SNPs showing significant associations in previous studies were genotyped. The associations were evaluated by logistic regression analysis using additive, dominant, and recessive genetic models.
  
  
  RESULTS
  Fourteen of 34 SNPs showed a nominally significant association (p < 0.05) with at least one diagnostic group. These association trends were strongest for the schizophrenia and combined schizophrenia and bipolar I disorder (BD-I) groups. The strongest association was observed in rs11637898 for schizophrenia (p = 0.0033) and BD-I (p = 0.0050) under the dominant model. The association between rs11637898 and the combined schizophrenia and BD-I group (p = 0.0006, under the dominant model) remained significant after correcting for multiple testing.
  
  
  CONCLUSIONS
  We identified a possible role of ST8SIA2 in the common susceptibility of schizophrenia and BD-I. However, no association trend was observed for bipolar II disorder. Further efforts are needed to identify a specific phenotype associated with this gene crossing the current diagnostic categories.
authors.affiliation: Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
authors.forename: So Yung
authors.initials: SY
authors.lastname: Yang
authors.affiliation: Department of Statistics, Seoul National University, Seoul, Korea.
authors.forename: Ik Soo
authors.initials: IS
authors.lastname: Huh
authors.affiliation: Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Baek
authors.affiliation: Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Korea.
authors.forename: Eun-Young
authors.initials: EY
authors.lastname: Cho
authors.affiliation: Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Korea.
authors.forename: Mi Ji
authors.initials: MJ
authors.lastname: Choi
authors.affiliation: Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
authors.forename: Seunghyong
authors.initials: S
authors.lastname: Ryu
authors.affiliation: Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea.
authors.forename: Ji Sun
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Statistics, Seoul National University, Seoul, Korea.
authors.forename: Taesung
authors.initials: T
authors.lastname: Park
authors.affiliation: Seoul National Hospital, Seoul, Korea; Department of Neuropsychiatry, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Kyunggi-Do, Korea.
authors.forename: Kyooseob
authors.initials: K
authors.lastname: Ha
authors.affiliation: Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea; Center for Clinical Research, Samsung Biomedical Research Institute, Seoul, Korea.
authors.forename: Kyung Sue
authors.initials: KS
authors.lastname: Hong
mesh_terms: D000328:Adult; D000483:Alleles; D001714:Bipolar Disorder / Q000175:diagnosis / Q000235:genetics*; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D016015:Logistic Models; D008875:Middle Aged; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D012559:Schizophrenia / Q000175:diagnosis / Q000235:genetics*; D012799:Sialyltransferases / Q000235:genetics*; D055815:Young Adult
chemical_list: C046778:CMP-N-acetylneuraminate-poly-alpha-2,8-sialosyl sialyltransferase; D012799:Sialyltransferases