The connection of the TCF4 gene, which encodes transcription factor 4, and MAD1L1 (MAD1 Mitotic Arrest Deficient Like 1) with re-experiencing was also demonstrated, which is interesting because until now these loci were associated with schizophrenia [181,182] and schizophrenia and bipolar disorder [181,183], respectively. The gene discussed is TCF4; the disease is bipolar disorder.