Transcription regulator specifically required for multiciliate cell differentiation. Acts in a multiprotein complex containing e2f4 and e2f5 that binds and activate genes required for centriole biogenesis. Activates genes required for centriole assembly (plk4, cep152) and genes specifically required for motile cilia formation (foxj1). Also promotes the deuterosome pathway of centriole biogenesis by activating expression of deup1, but not its paralog cep63. Component of the EDM complex, at least composed of e2f4, e2f5, mcidas and tfdp1. The TIRT domain mediates interaction with e2f4 and tfdp1. Belongs to the geminin family.