May function as a transcription repressor. Binds to 5'-CCACA-3' core sequence. Suppresses osteogenic effects of RUNX2. May be involved in osteoblastic differentiation (By similarity). Plays a role in postnatal myogenesis, may be involved in the regulation of satellite cells self-renewal (By similarity). Interacts with RUNX2. Binds consensus element OSE2 (By similarity). Expressed in kidney and skeletal muscle. Very low expression in brain and heart. Expressed in brain. Very low expression in lung and liver. KRAB domain is not required for nuclear targeting or for DNA binding. Zinc finger region is involved in nuclear targeting and DNA-binding. Belongs to the krueppel C2H2-type zinc-finger protein family.