HNF1A and post-traumatic stress disorder: In contrast, higher levels of GP27, in which the dominant N-glycan type is also A3G3S3, were observed in PTSD subjects who were AA homozygotes (A allele carriers) compared to the GG homozygotes (G allele carriers) of the HNF1A-AS1 rs7953249 polymorphism (Figure 4).