Predicted to enable ribonucleoprotein complex binding activity. Predicted to be involved in maturation of 5.8S rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA); maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA); and regulation of cell cycle. Predicted to act upstream of or within rRNA processing. Predicted to be located in nucleolus and nucleoplasm. Predicted to be part of PeBoW complex and preribosome, large subunit precursor. Is expressed in several structures, including immature eye; musculature system; nervous system; neural plate; and segmental plate. Orthologous to human WDR12 (WD repeat domain 12).