COMT Val158Met moderation of stress-induced psychosis

Nicholas C. Stefanis, Cécile Henquet, Dimitrios Avramopoulos, Nikolaos Smyrnis, Ioannis Evdokimidis, Inez Myin-Germeys, Costas N. Stefanis, Jim Van Os

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Background. Exposure to stressful life events increases the risk of developing a psychotic disorder. Moreover, increased reactivity to stress seems to represent part of the vulnerability for psychosis. This study aimed to investigate whether a functional polymorphism in the catechol-O- methyltransferase (COMT Val158Met) gene moderates the psychosis-inducing effects of stress. Method. A semi-experimental stress exposure paradigm was used in a sample of 306 genotyped young men (aged 19-24 years), in whom measures of psychotic symptoms were obtained at recruitment in the Greek army (exposed condition) and again after 18 months of military training (unexposed condition). Results. Stress exposure at army induction was associated with an increased level of psychotic symptoms. In addition, carriers of the COMT Val158Met Val allele were more susceptible to the effect of stress on the psychosis outcome than those with the Met/Met genotype (test for interaction: χ2=5.02, df=1, p=0.025). Conclusion. The COMT Val158Met genotype may moderate the effect of stress on psychotic symptoms.

Original languageEnglish (US)
Pages (from-to)1651-1656
Number of pages6
JournalPsychological medicine
Issue number11
StatePublished - Nov 2007
Externally publishedYes

ASJC Scopus subject areas

  • Applied Psychology
  • Psychiatry and Mental health


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