title: Polymorphism of the brain-derived neurotrophic factor gene and performance on a cognitive prefrontal test in bipolar patients.
abstract: OBJECTIVE
  The aim of the study was to test a possible association between the Val66Met polymorphism of the brain-derived neurotrophic factor (BDNF) gene and performance on a neurocognitive test, the Wisconsin Card Sorting Test (WCST), in bipolar patients.
  
  
  METHODS
  Fifty-four bipolar patients were studied, 18 male and 36 female, aged 18-72 (mean 46 years). The number of perseverative errors (WCST-P), non-perseverative errors (WCST-NP), completed corrected categories (WCST-CC), conceptual level responses (WCST-%CONC) and set to the first category (WCST-1st CAT) were measured in relation to the Val66Met genotypes of BDNF.
  
  
  RESULTS
  The percentages of subjects with Val/Val, Val/Met and Met/Met genotypes were respectively 81.5, 16.7 and 1.8%. Subjects with Val/Val and Val/Met genotypes did not differ on clinical factors except for the age of onset of the illness, which was earlier in Val/Val than Val/Met genotype (27 years versus 38 years). The performance in all domains of WCST was significantly better in subjects with Val/Val BDNF genotype compared with Val/Met genotype.
  
  
  CONCLUSIONS
  The results suggest a role of BDNF in prefrontal cognitive function in bipolar illness. The tests of prefrontal cognition may be considered as endophenotypic markers in bipolar illness.
authors.affiliation: Department of Adult Psychiatry, University of Medical Sciences, Poznan, Poland. rybakows@wlkp.top.pl
authors.forename: Janusz K
authors.initials: JK
authors.lastname: Rybakowski
authors.forename: Alina
authors.initials: A
authors.lastname: Borkowska
authors.forename: Piotr M
authors.initials: PM
authors.lastname: Czerski
authors.forename: Maria
authors.initials: M
authors.lastname: Skibińska
authors.forename: Joanna
authors.initials: J
authors.lastname: Hauser
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001714:Bipolar Disorder / Q000097:blood / Q000235:genetics* / Q000523:psychology; D019208:Brain-Derived Neurotrophic Factor / Q000097:blood / Q000235:genetics*; D003071:Cognition; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D011044:Poland; D011110:Polymorphism, Genetic; D017397:Prefrontal Cortex / Q000503:physiopathology
chemical_list: D019208:Brain-Derived Neurotrophic Factor