title: Do COMT, BDNF and NRG1 polymorphisms influence P50 sensory gating in psychosis?
abstract: BACKGROUND
  Auditory P50 sensory gating deficits correlate with genetic risk for schizophrenia and constitute a plausible endophenotype for the disease. The well-supported role of catechol-O-methyltransferase (COMT), brain-derived neurotrophic factor (BDNF) and neuregulin 1 (NRG1) genes in neurodevelopment and cognition make a strong theoretical case for their influence on the P50 endophenotype.
  
  
  METHODS
  The possible role of NRG1, COMT Val158Met and BDNF Val66Met gene polymorphisms on the P50 endophenotype was examined in a large sample consisting of psychotic patients, their unaffected relatives and unrelated healthy controls using linear regression analyses.
  
  
  RESULTS
  Although P50 deficits were present in patients and their unaffected relatives, there was no evidence for an association between NRG1, COMT Val158Met or BDNF Val66Met genotypes and the P50 endophenotype.
  
  
  CONCLUSIONS
  The evidence from our large study suggests that any such association between P50 indices and NRG1, COMT Val158Met or BDNF Val66Met genotypes, if present, must be very subtle.
authors.affiliation: NIHR Biomedical Research Centre, Institute of Psychiatry, King's College London/South London and Maudsley NHS Foundation Trust, London, UK. Madiha.Shaikh@kcl.ac.uk
authors.forename: M
authors.initials: M
authors.lastname: Shaikh
authors.forename: M-H
authors.initials: MH
authors.lastname: Hall
authors.forename: K
authors.initials: K
authors.lastname: Schulze
authors.forename: A
authors.initials: A
authors.lastname: Dutt
authors.forename: M
authors.initials: M
authors.lastname: Walshe
authors.forename: I
authors.initials: I
authors.lastname: Williams
authors.forename: M
authors.initials: M
authors.lastname: Constante
authors.forename: M
authors.initials: M
authors.lastname: Picchioni
authors.forename: T
authors.initials: T
authors.lastname: Toulopoulou
authors.forename: D
authors.initials: D
authors.lastname: Collier
authors.forename: F
authors.initials: F
authors.lastname: Rijsdijk
authors.forename: J
authors.initials: J
authors.lastname: Powell
authors.forename: M
authors.initials: M
authors.lastname: Arranz
authors.forename: R M
authors.initials: RM
authors.lastname: Murray
authors.forename: E
authors.initials: E
authors.lastname: Bramon
mesh_terms: D000328:Adult; D000368:Aged; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics*; D002394:Catechol O-Methyltransferase / Q000235:genetics*; D058068:Endophenotypes; D005072:Evoked Potentials, Auditory / Q000235:genetics*; D005192:Family Health; D005260:Female; D006801:Humans; D016014:Linear Models; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D020890:Neuregulin-1 / Q000235:genetics*; D011110:Polymorphism, Genetic; D011618:Psychotic Disorders / Q000235:genetics*
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D020890:Neuregulin-1; D002394:Catechol O-Methyltransferase