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Posttraumatic psychopathology and the pace of the epigenetic clock: a longitudinal investigation

  • Erika J. Wolf (a1) (a2), Mark W. Logue (a1) (a2) (a3), Filomene G. Morrison (a1) (a2), Elizabeth S. Wilcox (a1), Annjanette Stone (a4), Steven A. Schichman (a4), Regina E. McGlinchey (a5) (a6), William P. Milberg (a5) (a6) and Mark W. Miller (a1) (a2)...

Abstract

Background

Posttraumatic stress disorder (PTSD) and stress/trauma exposure are cross-sectionally associated with advanced DNA methylation age relative to chronological age. However, longitudinal inquiry and examination of associations between advanced DNA methylation age and a broader range of psychiatric disorders is lacking. The aim of this study was to examine if PTSD, depression, generalized anxiety, and alcohol-use disorders predicted acceleration of DNA methylation age over time (i.e. an increasing pace, or rate of advancement, of the epigenetic clock).

Methods

Genome-wide DNA methylation and a comprehensive set of psychiatric symptoms and diagnoses were assessed in 179 Iraq/Afghanistan war veterans who completed two assessments over the course of approximately 2 years. Two DNA methylation age indices (Horvath and Hannum), each a weighted index of an array of genome-wide DNA methylation probes, were quantified. The pace of the epigenetic clock was operationalized as change in DNA methylation age as a function of time between assessments.

Results

Analyses revealed that alcohol-use disorders (p = 0.001) and PTSD avoidance and numbing symptoms (p = 0.02) at Time 1 were associated with an increasing pace of the epigenetic clock over time, per the Horvath (but not the Hannum) index of cellular aging.

Conclusions

This is the first study to suggest that posttraumatic psychopathology is longitudinally associated with a quickened pace of the epigenetic clock. Results raise the possibility that accelerated cellular aging is a common biological consequence of stress-related psychopathology, which carries implications for identifying mechanisms of stress-related cellular aging and developing interventions to slow its pace.

Copyright

Corresponding author

Author for correspondence: Erika J. Wolf, E-mail: Erika.Wolf@va.gov

References

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