OXT and autism: Oxytocin peptide and plasma level abnormalities (Green et al., 2001, Modahl et al., 1998), receptor genetic variant associations (Campbell et al., 2011, Liu et al., 2010, Skuse et al., 2014, Wermter et al., 2010, Wu et al., 2005), and epigenetic alterations (Gregory et al., 2009, Gurrieri and Neri, 2009, Jacob et al., 2007, Kumsta et al., 2013) have been observed in autistic populations, providing support for a connection between atypical oxytocin genetics or epigenetic regulation and autism.