Moreover, patients with ASD, post-traumatic stress disorder (PTSD), attention-deficit hyperactivity disorder (ADHD), or other psychiatric disorders showed conspicuous variations in the OXTR gene (Gregory et al., 2009; Kalyoncu et al., 2019; Cao et al., 2020; Kimura et al., 2020). This evidence concerns the gene OXTR and post-traumatic stress disorder.