Finding Suitable Phenotypes for Genetic Studies of Schizophrenia: Heritability and Segregation Analysis

Maartje F. Aukes, Behrooz Z. Alizadeh, Margriet M. Sitskoorn, Jean Paul Selten, Richard J. Sinke, Chantal Kemner, Roel A. Ophoff, René S. Kahn

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Background: Schizophrenia is a highly heritable and complex disorder. Multiple genes are likely to be involved, complicating genetic research into the etiology of this disorder. Intermediate phenotypes or endophenotypes may facilitate genetic research if they display a simpler mode of transmission than schizophrenia itself, i.e., if they reflect more closely the underlying genetic effects. Methods: Twenty-five multigenerational families with multiple members affected with schizophrenia (180 subjects) were administered an extensive neuropsychological, psychophysiological, and personality test battery. Familial correlations were calculated to select heritable traits. Subsequent heritability analysis followed by commingling and segregation analysis were performed to unravel the pattern of transmission and to estimate heritability. Results: Five traits, including sensorimotor gating, openness, verbal fluency, early visual perception, and spatial working memory, showed moderate familial correlations. Heritability estimates for these traits ranged from 37% to 54%. A major gene model resembling dominant transmission was found for both sensorimotor gating and openness. Verbal fluency, early visual perception, and spatial working memory may be accounted for by polygenic, multifactorial, or environmental effects. Conclusions: Only 2 of 13 candidate endophenotypes showed a simple mode of transmission useful for successful application in molecular genetic research: sensorimotor gating and openness. To our knowledge, this is the first study to investigate the pattern of transmission for these traits.

Original languageEnglish
Pages (from-to)128-136
Number of pages9
JournalBiological Psychiatry
Volume64
Issue number2
DOIs
StatePublished - 15 Jul 2008
Externally publishedYes

Keywords

  • Heritability
  • inheritance pattern
  • neurocognition
  • personality
  • psychophysiology
  • quantitative trait
  • schizophrenia

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