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Polygenic Risk for Externalizing Psychopathology and Executive Dysfunction in Trauma-Exposed Veterans

Citation:

Sadeh, N., Wolf, E. J., Logue, M. W., Lusk, J., Hayes, J. P., McGlinchey, R. E., Milberg, W. P., et al. (2016). Polygenic Risk for Externalizing Psychopathology and Executive Dysfunction in Trauma-Exposed Veterans. Clin Psychol Sci , 4 545-558.

Date Published:

May

Abstract:

The frequent co-occurrence of antisocial behavior and other disinhibited phenotypes reflects a highly heritable externalizing spectrum. We examined the molecular genetic basis of this spectrum by testing polygenic associations with psychopathology symptoms, impulsive traits, and cognitive functions in two samples of primarily military veterans (n =537, n =194). We also investigated whether polygenic risk for externalizing moderated the effects of trauma on these phenotypes. As hypothesized, polygenic risk positively predicted externalizing psychopathology and negatively predicted performance on inhibitory control tasks. Gene-by-environment effects were also evident, with trauma exposure predicting greater impulsivity and less working memory capacity, but only at high levels of genetic liability. As expected, polygenic risk was not associated with internalizing psychopathology or episodic memory performance. This is the first independent replication of the polygenic score as a measure of genetic predispositions for externalizing and provides preliminary evidence that executive dysfunction is a heritable vulnerability for externalizing psychopathology.

Notes:

2167-7034Sadeh, NaomiWolf, Erika JLogue, Mark WLusk, JoannaHayes, Jasmeet PMcGlinchey, Regina EMilberg, William PStone, AnnjanetteSchichman, Steven AMiller, Mark WR01 DA042755/DA/NIDA NIH HHS/United StatesI01 BX002150/BX/BLRD VA/United StatesI01 CX000431/CX/CSRD VA/United StatesU10 AA008401/AA/NIAAA NIH HHS/United StatesR01 MH079806/MH/NIMH NIH HHS/United StatesR21 MH102834/MH/NIMH NIH HHS/United StatesJournal ArticleClin Psychol Sci. 2016 May;4(3):545-558. doi: 10.1177/2167702615613310. Epub 2015 Dec 10.