The most noticeable negative correlations were observed between the triantennary trigalactosylated plasma N-glycans (GP24 (p = 0.006), GP26 (p = 0.005), GP30 (p = 0.007) and GP31 (p = 0.010)) and CpG3 site methylation, whereas nominally negative correlations were found with CpG2 methylation (p < 0.05) in patients with PTSD but not in the control subjects. Here, ERVW-1 is linked to post-traumatic stress disorder.