DLG4 and schizophrenia: In this study, after re-sequenced the putative core promoter region, all the exons, and the 3′UTR regions of the DLG4 gene in our patients, we did not find missense or frameshifting mutations in the DLG4 gene associated schizophrenia, indicating that exonic mutations in the DLG4 might be very rare in schizophrenia, and unlikely play a major role in the pathogenesis of schizophrenia.