Genetic modifiers and subtypes in schizophrenia: Investigations of age at onset, severity, sex and family history

Sarah E. Bergen, Colm T. O'Dushlaine, Phil H. Lee, Ayman H. Fanous, Douglas M. Ruderfer, Stephan Ripke, Patrick F. Sullivan, Jordan W. Smoller, Shaun M. Purcell, Aiden Corvin

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Schizophrenia is a genetically and clinically heterogeneous disorder. Genetic risk factors for the disorder may differ between the sexes or between multiply affected families compared to cases with no family history. Additionally, limited data support a genetic basis for variation in onset and severity, but specific loci have not been identified. We performed genome-wide association studies (GWAS) examining genetic influences on age at onset (AAO) and illness severity as well as specific risk by sex or family history status using up to 2762 cases and 3187 controls from the International Schizophrenia Consortium (ISC).Subjects with a family history of schizophrenia demonstrated a slightly lower average AAO that was not significant following multiple testing correction (p=.048), but no differences in illness severity were observed by family history status (p=.51). Consistent with prior reports, we observed earlier AAO (p=.005) and a more severe course of illness for men (p=.002). Family history positive analyses showed the greatest association with KIF5C (p=1.96×10-8), however, genetic risk burden overall does not differ by family history. Separate association analyses for males and females revealed no significant sex-specific associations. The top GWAS hit for AAO was near the olfactory receptor gene OR2K2 (p=1.52×10-7). Analyses of illness severity (episodic vs. continuous) implicated variation in ST18 (p=8.24×10-7). These results confirm recognized demographic relationships but do not support a simplified genetic architecture for schizophrenia subtypes based on these variables.

Original languageEnglish (US)
Pages (from-to)48-53
Number of pages6
JournalSchizophrenia Research
Volume154
Issue number1-3
DOIs
StatePublished - Apr 2014
Externally publishedYes

Keywords

  • Association
  • GWAS
  • Gender
  • Psychosis

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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