The susceptibility genes (such as DISC1 [33,34], RELN [35,36], GABA [37–39], SHANK3 [40,41], NRXN1 [20,42], NTNG1 [43,44], etc.), which were associated with schizophrenia, also confer risk to ASD. This evidence concerns the gene NRXN1 and schizophrenia.