Predicted to enable 3'-5'-DNA exonuclease activity and DNA-directed DNA polymerase activity. Acts upstream of or within DNA replication. Predicted to be located in nucleus. Predicted to be part of delta DNA polymerase complex. Is expressed in several structures, including brain; immature eye; neural crest; proliferative region; and retina. Orthologous to human POLD1 (DNA polymerase delta 1, catalytic subunit).