TRANK1 and Behcet disease: These variants were found within 6 regions of the genome, two which were previously associated with SCZ, MHC, MAD1L1; two previously associated with BD, TRANK1, IFI44L, one gene that was based on previous work was associated with both diseases, CACNA1C; and a novel risk gene, PIK3C2A, also associated with both SCZ and BD.