This gene encodes the protein is one of the PcG proteins. It has been shown to interact with, and suppress the activity of, transcription factor CP2 (TFCP2/CP2). This protein was found to interact with huntingtin interacting protein 2 (HIP2), possess ubiquitin ligase activity, and an ubiquitin-conjugating enzyme. Studies of the mouse counterpart suggested the involvement of this gene in the specification of anterior-posterior axis, as well as in cell proliferation in early development.