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.2012 Sep;159B(6):644-52.
doi: 10.1002/ajmg.b.32068. Epub 2012 Jun 12.

Serotonin transporter 5-HTTLPR genotype moderates the effects of childhood adversity on posttraumatic stress disorder risk: a replication study

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Serotonin transporter 5-HTTLPR genotype moderates the effects of childhood adversity on posttraumatic stress disorder risk: a replication study

Pingxing Xie et al. Am J Med Genet B Neuropsychiatr Genet.2012 Sep.

Abstract

We reported that the 5-HTTLPR polymorphism in the promoter region of the serotonin transporter gene (SLC6A4) moderates the effect of childhood adversity on posttraumatic stress disorder (PTSD) risk [Xie et al. (2009); Arch Gen Psychiatry 66 (11): 1201-1209]. In the present study, we considered 5,178 subjects (a group with generally high substance dependence comorbidity, as for our previous study) using similar methodology to replicate our previous results. We used logistic regression analyses to explore the interaction effect of 5-HTTLPR genotype and childhood adversity on PTSD risk. We found that, as reported in our previous study, in individuals with childhood adversity, the presence of one or two copies of the S allele of 5-HTTLPR increased the risk to develop PTSD. This gene-environment interaction effect was present in European Americans (EAs), but not in African Americans (AAs; EAs, OR = 1.49, 95% CI = 1.07-2.08, P = 0.019; AAs, OR = 0.90, 95% CI = 0.60-1.35, P = 0.62). The statistical power to detect this interaction effect was increased when data were combined with those from our previous study [Xie et al. (2009); Arch Gen Psychiatry 66 (11): 1201-1209]. The findings reported here replicate those from our previous work, adding to a growing body of research demonstrating that the 5-HTTLPR genotype moderates risk for anxiety and depression phenotypes in the context of stress and adverse events.

Copyright © 2012 Wiley Periodicals, Inc.

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Figures

Figure 1
Figure 1
effects of number of categories of childhood adversity experienced on PTSD risk.
Figure 2
Figure 2
5-HTTLPR genotype interacted with childhood adversity to moderate risk for PTSD in European Americans (a), but not in African Americans (b).
Figure 3
Figure 3
5-HTTLPR genotype moderated the effect of childhood adversity on risk for PTSD in European Americans (a), but not in African Americans (b) from the combined sample.
Figure 4
Figure 4
The interaction of5-HTTLPR genotype and the number of categories of childhood adversity on risk of PTSD in European Americans from the combined sample.
See this image and copyright information in PMC

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