Predicted to enable DNA-directed 5'-3' RNA polymerase activity. Predicted to be involved in DNA replication, synthesis of primer. Predicted to act upstream of or within DNA replication. Predicted to be part of alpha DNA polymerase:primase complex. Is expressed in several structures, including blastodisc; head; hematopoietic system; nervous system; and pectoral fin musculature. Orthologous to human PRIM1 (DNA primase subunit 1).