Association of a nonsynonymous variant of DAOA with visuospatial ability in a bipolar family sample

Biol Psychiatry. 2008 Sep 1;64(5):438-42. doi: 10.1016/j.biopsych.2008.03.028. Epub 2008 May 7.

Abstract

Background: Bipolar disorder and schizophrenia are hypothesized to share some genetic background.

Methods: In a two-phase study, we evaluated the effect of five promising candidate genes for psychotic disorders, DAOA, COMT, DTNBP1, NRG1, and AKT1, on bipolar spectrum disorder, psychotic disorder, and related cognitive endophenotypes in a Finnish family-based sample ascertained for bipolar disorder.

Results: In initial screening of 362 individuals from 63 families, we found only marginal evidence for association with the diagnosis-based dichotomous classification. Those associations did not strengthen when we genotyped the complete sample of 723 individuals from 180 families. We observed a significant association of DAOA variants rs3916966 and rs2391191 with visuospatial ability (Quantitative Transmission Disequilibrium Test [QTDT]; p = 4 x 10(-6) and 5 x 10(-6), respectively) (n = 159) with the two variants in almost complete linkage disequilibrium. The COMT variant rs165599 also associated with visuospatial ability, and in our dataset, we saw an additive effect of DAOA and COMT variants on this neuropsychological trait.

Conclusions: The ancestral allele (Arg) of the nonsynonymous common DAOA variant rs2391191 (Arg30Lys) was found to predispose to impaired performance. The DAOA gene may play a role in predisposing individuals to a mixed phenotype of psychosis and mania and to impairments in related neuropsychological traits.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Analysis of Variance
  • Bipolar Disorder / genetics*
  • Bipolar Disorder / physiopathology*
  • Carrier Proteins / genetics*
  • Catechol O-Methyltransferase / genetics
  • Family Health*
  • Female
  • Gene Frequency
  • Genetic Predisposition to Disease*
  • Genotype
  • Humans
  • Intracellular Signaling Peptides and Proteins
  • Linkage Disequilibrium
  • Male
  • Neuropsychological Tests
  • Photic Stimulation
  • Polymorphism, Single Nucleotide*
  • Space Perception / physiology*

Substances

  • Carrier Proteins
  • DAOA protein, human
  • Intracellular Signaling Peptides and Proteins
  • Catechol O-Methyltransferase