Predicted to enable NAD DNA ADP-ribosyltransferase activity; NAD+ ADP-ribosyltransferase activity; and protein ADP-ribosylase activity. Involved in negative regulation of isotype switching. Acts upstream of or within double-strand break repair. Located in site of double-strand break. Orthologous to human PARP3 (poly(ADP-ribose) polymerase family member 3). [provided by Alliance of Genome Resources, Apr 2022]