HNF1A and post-traumatic stress disorder: To evaluate the association of CpG methylation in the HNF1A gene with the human plasma and IgG N-glycan levels, as well as to distinguish the possible differences in methylation of this gene coding for transcription factor between the patients with PTSD and control subjects, the four CpG sites in the HNF1A gene were analyzed: CpG1, located at +172; CpG2, located at +175; CpG3, located at +178; and CpG4, positioned at +182 from the transcription start site in exon 1 of HNF1A (NCBI Reference Sequence: NG_011731.2).