According to a study of convergent functional genomics [4], among the most promising candidate genes known to play a role in the disorder are disrupted-in schizophrenia (DISC1), transcription factor 4 (TCF4), myelin basic protein (MBP) and heat-shock 70-kDa protein 1B (HSPA1B) [9,10,11,12,13]. The gene discussed is TCF4; the disease is schizophrenia.