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  • Title: A longitudinal study of personality and major depression in a population-based sample of male twins.
    Author: Fanous AH, Neale MC, Aggen SH, Kendler KS.
    Journal: Psychol Med; 2007 Aug; 37(8):1163-72. PubMed ID: 17407614.
    Abstract:
    BACKGROUND: The relationship between personality and psychiatric illness is complex. It is not clear whether one directly causes the other. METHOD: In a population-based sample of male twins (n=3030), we attempted to predict major depression (MD) from neuroticism (N) and extraversion (E) and vice versa, to evaluate the causal, scar, state, and prodromal hypotheses. In a longitudinal, structural equation twin model, we decomposed the covariation between N and MD into (a) genetic and environmental factors that are common to both traits, as well as specific to each one and (b) direct causal effects of N at time 1 on subsequent MD, as well as between MD and subsequent N. RESULTS: E was negatively correlated with lifetime and one-year prevalence of MD. N predicted the new onset of MD, and was predicted by both current and past MD. It did not predict the time to onset of MD. All of the covariation between N and MD was due to additive genetic and individual-specific environmental factors shared by both traits and a direct causal path between MD and N assessed later. No genetic factors were unique to either trait. CONCLUSIONS: In men, N may be a vulnerability factor for MD but does not cause it directly. However, MD may have a direct causal effect on N. The genetic overlap between N and MD in men may be greater than in women.
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