Other genes included in this study play a role in the molecular pathology of some cases diagnosed with schizophrenia and other psychiatric illness (e.g., BDNF, DRD2, GABRA2, GAD1, HOXA1, NTF3) or are linked to chronic neurodegeneration (LDLR, PSEN1, S100A2). The gene discussed is PSEN1; the disease is schizophrenia.