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A Replication

Kenneth S. Kendler, MD; Jonathan W. Kuhn, PhD; Jen Vittum, BS; Carol A. Prescott, PhD; Brien Riley, PhD

Arch Gen Psychiatry. 2005;62:529-535.

Context  Prior evidence from twin studies suggested genetic moderation of the depressogenic effects of stressful life events (SLEs). Can the specific genes involved in this effect be identified?

Objective  To replicate and extend a recent study that a functional variant in the serotonin transporter (5-HTT) might in part explain these findings.

Design  Characterizing risk for major depression and generalized anxiety syndrome in the last year as a function of 5-HTT genotype, sex, and the occurrence of SLEs and ratings of the SLE-associated level of threat.

Setting  A population-based sample of adult twins.

Participants  Five hundred forty-nine male and female twins with a mean age at participation of 34.9 years (SD 9.1).

Main Outcome Measure  Episodes of major depression and generalized anxiety syndrome in the last year with onset measured to the nearest month.

Results  Individuals with 2 short (S) alleles at the 5-HTT locus were more sensitive to the depressogenic effects of all SLEs than were those with 1 or 2 long (L) alleles. When level of SLE-associated threat was examined, the interaction between genotype and SLE resulted from an increased sensitivity of SS individuals to the depressogenic effects of common low-threat events. These events had little impact on risk for those possessing the SL and LL genotypes. The 5-HTT genotype did not modify the effects of SLEs on risk for generalized anxiety syndrome.

Conclusion  Variation at the 5-HTT moderates the sensitivity of individuals to the depressogenic effects of SLEs largely by producing, in SS individuals, an increased sensitivity to the impact of mild stressors. Replication of these intriguing results is needed.

Author Affiliations: Virginia Institute for Psychiatry and Behavioral Genetics (Drs Kendler, Kuhn, Prescott, and Riley and Ms Vittum) and Departments of Psychiatry (Drs Kendler, Kuhn, Prescott, and Riley and Ms Vittum), Human Genetics (Drs Kendler and Riley), and Psychology (Dr Prescott), Medical College of Virginia of Virginia Commonwealth University, Richmond.

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