H2BC15 and bipolar disorder: Besides, histonic methylation from histonic genes (HIST1H1B, HIST1H2BL, HIST1H2BN, HIST1H2AJ and HIST1H4L) plays a prominent role in bipolar disorder and synapse and postsynapse‐related processes of SCZ (Network and Pathway Analysis Subgroup of Psychiatric Genomics Consortium 2015).