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PARP1 and PARP2 govern the DNA-damage response by catalysing the reversible post-translational modification ADP-ribosylation. During the repair of DNA lesions, PARP1 and PARP2 combine with an accessory factor HPF1, which is required for the modification of target proteins on serine residues. Although the physiological role of individual ADP-ribosylation sites is still unclear, serine ADP-ribosylation at damage sites leads to the recruitment of chromatin remodellers and repair factors to ensure efficient DNA repair. ADP-ribosylation sign