Review Article

Epigenetic Mechanisms Shape the Biological Response to Trauma and Risk for PTSD: A Critical Review

Table 2

Gene expression studies.

StudyAnalysis methodSampleFindings

Zieker et al., 2007 [26] Pre-selected stress-immune genes, whole-blood16 individuals
(PTSD = 8)
In PTSD, upregulated (4): glutamate transported, IGF-2; downregulated (14): IL-18, IL-16, colony stimulating factor.

Yehuda et al., 2009 [27]Whole blood gene expression35 individuals exposed to 9/11
(PTSD = 15)
FKBP5, STAT5B, and MHC class II showed reduced expression in individuals with PTSD.

Neylan et al., 2011 [28] CD14+ monocyte; gene expression67 ± trauma-exposed individuals
(PTSD = 34)
In PTSD patients, three monocyte genes were underexpressed in men but not in women.

Sarapas et al., 2011 [29]Genome-wide gene expression40 individuals exposed to 9/11 (PTSD = 20)PTSD patients showed a reduction in gene expression of STAT5B and nuclear factor I/A.

Mehta et al. 2011 [30]Whole-blood gene expression and SNP of FKBP5211 low income
(PTSD = 75)
With FKBP5 SNP added to interaction with PTSD, there was a reduction in 32 genes including IL-18 and STAT pathway.

Pace et al., 2012 [31]Nuclear factor- B activity in peripheral blood36 women
(PTSD = 12)
Increased nuclear factor- B activity was associated with women with PTSD as compared to controls.

van Zuiden et al., 2012 [32]GR number; FKBP5, GILZ, and SGK1 mRNA expression448 military personnel
(PTSD = 35)
Predeployment high GR number, low FKBP5 mRNA expression, and high GILZ expression predicted PTSD development.

van Zuiden et al., 2012 [33]GC sensitivity of leukocytes526 military personnel
(PTSD = 46)
Predeployment sensitivity of GCRs on leukocytes predicted development of PTSD.

Matić et al., 2013 [34]GR function and expression using PCR347 ± war trauma-exposed individuals
(PTSD = 113)
Lower GR sensitivity in PBMCs and low gene-expression of GR were found in PTSD patients.