Supporting this hypothesis, PROT mutations and Slc6A7 expression changes have been related to susceptibility to autism as well as schizophrenia (Hager et al., 2005; Voineagu et al., 2011; Hedges et al., 2012; Wen et al., 2014), and microdeletions at the 5q32 locus containing the Slc6a7 gene have been associated with intellectual disability (Vincent et al., 2014). This evidence concerns the gene SLC6A7 and autism.