Multiple pieces of evidence have linked CNTN2, CNTNAP2, GABBR2, and NTRK3 to neuropsychiatric disorders, including schizophrenia (Weickert et al., 2005; Friedman et al., 2008; Otnaess et al., 2009; Fazzari et al., 2010; Fatemi et al., 2011; Roussos et al., 2012; Bormuth et al., 2013; Fatemi et al., 2013; Karayannis et al., 2014). This evidence concerns the gene CNTN2 and schizophrenia.