Epigenome-wide association studies identify novel DNA methylation sites associated with PTSD: a meta-analysis of 23 military and civilian cohorts
- PMID: 39696436
- PMCID: PMC11658418
- DOI: 10.1186/s13073-024-01417-1
Epigenome-wide association studies identify novel DNA methylation sites associated with PTSD: a meta-analysis of 23 military and civilian cohorts
Abstract
Background: The occurrence of post-traumatic stress disorder (PTSD) following a traumatic event is associated with biological differences that can represent the susceptibility to PTSD, the impact of trauma, or the sequelae of PTSD itself. These effects include differences in DNA methylation (DNAm), an important form of epigenetic gene regulation, at multiple CpG loci across the genome. Moreover, these effects can be shared or specific to both central and peripheral tissues. Here, we aim to identify blood DNAm differences associated with PTSD and characterize the underlying biological mechanisms by examining the extent to which they mirror associations across multiple brain regions.
Methods: As the Psychiatric Genomics Consortium (PGC) PTSD Epigenetics Workgroup, we conducted the largest cross-sectional meta-analysis of epigenome-wide association studies (EWASs) of PTSD to date, involving 5077 participants (2156 PTSD cases and 2921 trauma-exposed controls) from 23 civilian and military studies. PTSD diagnosis assessments were harmonized following the standardized guidelines established by the PGC-PTSD Workgroup. DNAm was assayed from blood using Illumina HumanMethylation450 or MethylationEPIC (850 K) BeadChips. Within each cohort, DNA methylation was regressed on PTSD, sex (if applicable), age, blood cell proportions, and ancestry. An inverse variance-weighted meta-analysis was performed. We conducted replication analyses in tissue from multiple brain regions, neuronal nuclei, and a cellular model of prolonged stress.
Results: We identified 11 CpG sites associated with PTSD in the overall meta-analysis (1.44e - 09 < p < 5.30e - 08), as well as 14 associated in analyses of specific strata (military vs civilian cohort, sex, and ancestry), including CpGs in AHRR and CDC42BPB. Many of these loci exhibit blood-brain correlation in methylation levels and cross-tissue associations with PTSD in multiple brain regions. Out of 9 CpGs annotated to a gene expressed in blood, methylation levels at 5 CpGs showed significant correlations with the expression levels of their respective annotated genes.
Conclusions: This study identifies 11 PTSD-associated CpGs and leverages data from postmortem brain samples, GWAS, and genome-wide expression data to interpret the biology underlying these associations and prioritize genes whose regulation differs in those with PTSD.
Keywords: DNA methylation; GWAS; Gene expression; PTSD; Postmortem brain; Trauma.
© 2024. This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply.
Conflict of interest statement
Declarations. Ethics approval and consent to participate: All studies were approved by the institutional review boards (IRBs) of each respective institution and carried out in accordance with The Code of Ethics of the Helsinki Declaration. The BEAR study was approved by the Lifespan Hospitals IRB. DNHS was approved by the IRB at the University of Michigan and the University of North Carolina at Chapel Hill. DCHS was approved by the Faculty of Health Sciences, Human Research Ethics Committee, University of Cape Town, by Stellenbosch University, and by the Western Cape Provincial Health Research committee. GTP was approved by the IRBs of Emory University School of Medicine and the Research Oversight Committee of Grady Memorial Hospital. NIU study was approved by the Northern Illinois University IRB. Shared Roots study was approved by the IRB of Stellenbosch University (HREC: N13/08/115). AURORA is approved by the Biomedical IRB at UNC Chapel Hill through the office of Human Research Ethics, the central IRB for all study sites. H3_Rwanda was approved by the IRB of the College of Medicine and Health Sciences at the University of Rwanda (No.370/CMHS/IRB/2020). WTC study was approved by the Committees on Research Involving Human Subjects at Stony Brook University. GMRFQUT was approved by the Human Research Ethics Committee of the Queensland University of Technology and Greenslopes Private Hospital. MRS was approved by the IRBs of the University of California San Diego, VA San Diego Research Service, and Naval Health Research Center. PRISMO was approved by the IRB of the University Medical Center Utrecht. Army STARRS was approved by the Human Subjects Committees of the Uniformed Services University of the Health Sciences for the Henry M. Jackson Foundation (the primary grantee), the Institute for Social Research at the University of Michigan (the organization collecting the data), and all other collaborating organizations. PROGrESS was approved by the IRBs at VA Ann Arbor Healthcare System, the University of Michigan, Ralph H. Johnson VA Medical Center, VA San Diego Healthcare System, Massachusetts General Hospital, and the Department of Defense Human Research Protection Office. NCPTSD/TRACTS was approved by the IRBs of Human Studies Research at the VA Boston Healthcare System. INTRuST was approved by the Human Research Protection Program at the University of California San Diego. VA-M-AA and VA-M-EA were approved by the IRBs at the Salisbury VA, Hampton VA, Durham VA, and Duke University Medical Centers. All individuals provided written informed consent to participate in these studies. Consent for publication: Not applicable. Competing interests: CYC is an employee of Biogen Inc. NPD has served on scientific advisory boards for BioVie Pharma, Circular Genomics, and Sentio Solutions for unrelated work. NRN serves as an unpaid member of the Ilumivu advisory board. SAMR receives support from the Wounded Warrior Project (WWP), Department of Veterans Affairs (VA), National Institute of Health (NIH), McCormick Foundation, Tonix Pharmaceuticals, Woodruff Foundation, and Department of Defense (DOD). Dr. Rauch receives royalties from Oxford University Press and American. KJR serves as a consultant for Acer, Bionomics, and Jazz Pharma; SABs for Sage, Boehringer Ingelheim, and Senseye. DJS has received consultancy honoraria from Discovery Vitality, Johnson & Johnson, Kanna, L’Oreal, Lundbeck, Orion, Sanofi, Servier, Takeda and Vistagen. MBS has in the past 3 years received consulting income from Acadia Pharmaceuticals, Aptinyx, atai Life Sciences, BigHealth, Biogen, Bionomics, BioXcel Therapeutics, Boehringer Ingelheim, Clexio, Delix Therapeutics, Eisai, EmpowerPharm, Engrail Therapeutics, Janssen, Jazz Pharmaceuticals, NeuroTrauma Sciences, PureTech Health, Sage Therapeutics, Sumitomo Pharma, and Roche/Genentech. MBS has stock options in Oxeia Biopharmaceuticals and EpiVario. MBS has been paid for his editorial work on Depression and Anxiety (Editor-in-Chief), Biological Psychiatry (Deputy Editor), and UpToDate (Co-Editor-in-Chief for Psychiatry). MBS has also received research support from NIH, the Department of Veterans Affairs, and the Department of Defense. MBS is on the scientific advisory board for the Brain and Behavior Research Foundation and the Anxiety and Depression Association of America.
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Update of
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Epigenome-wide association studies identify novel DNA methylation sites associated with PTSD: A meta-analysis of 23 military and civilian cohorts.medRxiv [Preprint]. 2024 Jul 15:2024.07.15.24310422. doi: 10.1101/2024.07.15.24310422. medRxiv. 2024. Update in: Genome Med. 2024 Dec 18;16(1):147. doi: 10.1186/s13073-024-01417-1. PMID: 39072012 Free PMC article. Updated. Preprint.
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