Schizophrenia, bipolar disorders (SEPT5, 6, and 11) (Pennington et al. 2008), Down syndrome (SEPT4, 6, and 7) (Sitz et al. 2008), Alzheimer’s disease (SEPT1, 2, and 4) (Kinoshita et al. 1998), and Parkinson’s disease (SEPT4) (Ihara et al. 2007) were all associated to abnormalities of septin expression. This evidence concerns the gene SEPTIN4 and schizophrenia.