Transcription regulator specifically required for multiciliate cell differentiation (PubMed:25048963). Acts in a multiprotein complex containing E2F4 and E2F5 that binds and activates genes required for centriole biogenesis. Required for the deuterosome- mediated acentriolar pathway (PubMed:25048963). Plays a role in mitotic cell cycle progression by promoting cell cycle exit. Modulates GMNN activity by reducing its affinity for CDT1 (PubMed:21543332, PubMed:24064211). {ECO:0000250|UniProtKB:Q08B36, ECO:0000269|PubMed:21543332, ECO:0000269|PubMed:24064211, ECO:0000269|PubMed:25048963}. This is the function of ENSG00000234602 (MCIDAS, multiciliate differentiation and DNA synthesis associated cell cycle protein).