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 (PubMed:27446912). Expressed in brain. Lower levels in kidney, heart, lung, spleen and eye. Down-regulated during kidney maturation. Expressed in embryonic myogenic progenitor cells, not expressed in adult and aged satellite cells (PubMed:27446912). In myogenic progenitor cells, expressed during early myogenic development (11.5 dpc) to be gradually down-regulated during the fetal stages (from 14.5 dpc to adulthood). 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. Extended N-terminus.