HNF1A and post-traumatic stress disorder: The genotyping results revealed that the minor allele frequency (MAF) of the HNF1A-AS1 rs7953249 polymorphism (G allele) was 0.402 in all subjects (0.369 in patients with PTSD and 0.440 in control subjects), which is similar to the estimated MAF in the European population (0.440) [33].