GGT6 and Borderline personality disorder: Among BPD participants with high levels of childhood adversity, methylation levels at five CpG sites were significantly lower compared to those with low adversity and controls: cg15948871 in POUF1, cg24915915 in GPR55, cg04511534 in GGT6, cg00253346 in TNFRSF13C, and cg05478172 in FAM113B.