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Meta-Analysis
. 2025 May 14:55:e142.
doi: 10.1017/S0033291725000558.

PTSD and epigenetic aging: a longitudinal meta-analysis

Affiliations
Meta-Analysis

PTSD and epigenetic aging: a longitudinal meta-analysis

Xiang Zhao et al. Psychol Med. .

Abstract

Background: Posttraumatic stress disorder (PTSD) has been associated with advanced epigenetic age cross-sectionally, but the association between these variables over time is unclear. This study conducted meta-analyses to test whether new-onset PTSD diagnosis and changes in PTSD symptom severity over time were associated with changes in two metrics of epigenetic aging over two time points.

Methods: We conducted meta-analyses of the association between change in PTSD diagnosis and symptom severity and change in epigenetic age acceleration/deceleration (age-adjusted DNA methylation age residuals as per the Horvath and GrimAge metrics) using data from 7 military and civilian cohorts participating in the Psychiatric Genomics Consortium PTSD Epigenetics Workgroup (total N = 1,367).

Results: Meta-analysis revealed that the interaction between Time 1 (T1) Horvath age residuals and new-onset PTSD over time was significantly associated with Horvath age residuals at T2 (meta β = 0.16, meta p = 0.02, p-adj = 0.03). The interaction between T1 Horvath age residuals and changes in PTSD symptom severity over time was significantly related to Horvath age residuals at T2 (meta β = 0.24, meta p = 0.05). No associations were observed for GrimAge residuals.

Conclusions: Results indicated that individuals who developed new-onset PTSD or showed increased PTSD symptom severity over time evidenced greater epigenetic age acceleration at follow-up than would be expected based on baseline age acceleration. This suggests that PTSD may accelerate biological aging over time and highlights the need for intervention studies to determine if PTSD treatment has a beneficial effect on the aging methylome.

Keywords: DNA methylation; PTSD; accelerated aging; longitudinal; meta-analysis.

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Figures

Figure 1.
Figure 1.
Forest plot for the effect of the interaction term reflecting T1 Horvath DNAm age residuals by new-onset PTSD diagnosis on T2 Horvath DNAm age residuals (controlling for all other main effects in the model).
Figure 2.
Figure 2.
Forest plot for the effect of the interaction term reflecting T1 Horvath DNAm age residuals by change in harmonized PTSD symptom severity on T2 Horvath DNAm age residuals (controlling for all other main effects in the model).

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