CDCA8 is a component of the chromosomal passenger complex (CPC). The CPC complex has crucial functions at the centromere in ensuring accurate chromosome placement and isolation and is obligatory for chromatin-induced microtubule stabilization and spindle assembly. In the complex, CDCA8 protein is needed to direct the CPC to centromeric DNA. Removal of CDCA8 delays mitotic progression and causes kinetochore-spindle to mis-attach.