Enables NAD+ ADP-ribosyltransferase activity; chromatin binding activity; and protein ADP-ribosylase activity. Involved in negative regulation of telomere maintenance via telomere lengthening; positive regulation of single strand break repair; and voluntary musculoskeletal movement. Acts upstream of or within several processes, including DNA metabolic process; behavioral response to cocaine; and protein poly-ADP-ribosylation. Located in cytoplasm; nucleolus; and nucleoplasm. Part of protein-containing complex. Is expressed in several structures, including Peyer's patch; brain; gut; immune system; and retina. Human ortholog(s) of this gene implicated in several diseases, including arthritis; bacterial meningitis; neurodegenerative disease (multiple); stomach carcinoma; and type 2 diabetes mellitus. Orthologous to human PARP1 (poly(ADP-ribose) polymerase 1).