title: COMT Val 158 Met polymorphism is associated with cognitive flexibility in a signal discrimination task in schizophrenia.
abstract: BACKGROUND
  Associations between the well-known functional single nucleotide polymorphism Val (158)Met in the gene encoding catechol- O-methyltransferase (COMT) and cognitive do-mains affected in schizophrenia are inconsistent regarding directionality and specific impact and call for a more fundamental cognitive endophenotype. Recent studies suggest that the COMT genotype contributes to cognitive flexibility, a fundamental cognitive ability that potentially influences an individual's performance in a variety of other neurocognitive tasks.
  
  
  METHODS
  We investigated the association between COMT Val (158)Met genotype and cognitive flexibility as assessed by signal discrimination in the Continuous Performance Test - Identical Pairs version in a cohort of 111 German schizophrenic patients.
  
  
  RESULTS
  COMT genotype was significantly associated with signal discrimination index d' in schizophrenia. The Val/Val genotype was associated with the highest and the Met/Met genotype with the lowest scores; heterozygous individuals displayed an intermediate performance.
  
  
  CONCLUSIONS
  Our data suggest that allelic variation at the COMT Val (158)Met locus may influence signal discrimination capacity in schizophrenia and confirm that Val loading, probably due to decreased prefrontal dopamine availability, is associated with greater cognitive flexibility, which in turn may influence other cognitive measures that have been associated with COMT to date.
authors: Department of Psychiatry, Charité University Medicine, Campus Benjamin Franklin, Berlin, Germany. andres.neuhaus@charite.de
authors: A H
authors: AH
authors: Neuhaus
authors: C
authors: C
authors: Opgen-Rhein
authors: C
authors: C
authors: Urbanek
authors: E
authors: E
authors: Hahn
authors: T M T
authors: TM
authors: Ta
authors: M
authors: M
authors: Seidelsohn
authors: S
authors: S
authors: Strathmann
authors: F
authors: F
authors: Kley
authors: N
authors: N
authors: Wieseke
authors: T
authors: T
authors: Sander
authors: M
authors: M
authors: Dettling
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D002394:Catechol O-Methyltransferase / Q000235:genetics*; D003071:Cognition; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D009483:Neuropsychological Tests; D020641:Polymorphism, Single Nucleotide; D011930:Reaction Time; D012559:Schizophrenia / Q000235:genetics*; D012565:Schizophrenic Psychology; D017422:Sequence Analysis, DNA; D017603:Signal Detection, Psychological
chemical_list: D002394:Catechol O-Methyltransferase