The contributions of the rs9843659 polymorphism to the development of schizophrenia remains unexplained because 1) this SNP is found in the fourth large intron, but not in the exons that encode the amino acid sequences of the SAP97 protein including the functional domains and motifs, and 2) as previously described, bioinformatics tools we used failed to reveal any consensus sequences in the intron part that may play a role in the alternative promoter use or alternative splicing. Here, DLG1 is linked to schizophrenia.