Analysis of Posttraumatic Stress Disorder Gene Expression Profiles in a Prospective, Community-Based Cohort

Area of Science:

• Genomics and Molecular Biology
• Psychiatry and Behavioral Sciences
• Public Health

Background:

• Post-traumatic stress disorder (PTSD) is a significant psychiatric condition following trauma exposure, with poorly understood biological underpinnings.
• PTSD is associated with chronic health conditions, indicating potential long-term biological alterations.
• Gene expression studies are crucial for understanding the physiological basis of trauma embodiment in PTSD, but whole-transcriptome, longitudinal data are scarce.

Purpose of the Study:

• To identify gene expression signatures associated with the development of post-traumatic stress disorder (PTSD).
• To investigate the biological mechanisms underlying trauma embodiment using a longitudinal, transcriptome-wide approach.
• To analyze gene expression changes in whole blood samples before and after trauma exposure in a community-dwelling population.

Main Methods:

• Utilized RNA-sequencing for a transcriptome-wide gene expression screen on whole blood samples.
• Analyzed samples from a longitudinal, prospective cohort study of adults in Detroit, Michigan.
• Included 72 trauma-exposed participants, with 21 developing PTSD, assessed via structured telephone interviews and blood sampling pre- and post-trauma.

Main Results:

• Identified 45 differentially expressed genes associated with PTSD development.
• Observed an estimated log2 fold change greater than 1.5 at a nominal p-value.
• Found ubiquitous expression of specific genes (PAX6, TSPAN7, PXDN, VWC2, SULF1, NFATC4) across all brain regions.

Conclusions:

• Gene expression profiling reveals potential biological markers for PTSD development.
• Longitudinal blood sampling provides a valuable method for studying the pathophysiology of trauma embodiment.
• Findings contribute to understanding the genomic mechanisms linking traumatic experiences to physiological changes in PTSD.