The function of ENSG00000134690 (CDCA8, cell division cycle associated 8) is as follows. Component of the chromosomal passenger complex (CPC), a complex that acts as a key regulator of mitosis. The CPC complex has essential functions at the centromere in ensuring correct chromosome alignment and segregation and is required for chromatin-induced microtubule stabilization and spindle assembly. Major effector of the TTK kinase in the control of attachment-error-correction and chromosome alignment. {ECO:0000269|PubMed:15249581, ECO:0000269|PubMed:15260989, ECO:0000269|PubMed:16571674, ECO:0000269|PubMed:18243099}.