Deoxycytidyl transferase involved in DNA repair (PubMed:22532806). Transfers a dCMP residue from dCTP to the 3'-end of a DNA primer in a template-dependent reaction. May assist in the first step in the bypass of abasic lesions by the insertion of a nucleotide opposite the lesion. Required for normal induction of mutations by physical and chemical agents (By similarity). During homologous recombination (HR) repair of DNA double-strand breaks (DSBs) regulates the extent of repair synthesis (PubMed:22532806). Possibly recruits the DNA polymerase zeta complex or another translesion polymerase to early DSB repair intermediates to initiate repair synthesis, while also blocking the access of more processive polymerases preventing them from acting during the initial stages of HR repair (PubMed:22532806). Binds 2 magnesium ions. Interacts (via C-terminus) with PolH/DNApol-eta (via C-terminal regions). Interacts (via C-terminus) with PolI. Highly sensitive to ionizing radiation due to defects in homologous recombination (HR) repair. The percentage of full HR repair is normal but the length of the repair synthesis tracts is increased. Belongs to the DNA polymerase type-Y family. Extended N-terminus.