Extended Data Figure 6. Elevated ADP-ribose levels in CPT-treated XRCC1-/- RPE-1 cells are PARP1 dependent.
a, Representative ScanR images of wild type (“WT”), XRCC1-/-, PARP1-/-, and XRCC1-/-/PARP1-/- RPE-1 cells before and after 30 μM CPT treatment stained by indirect immunofluorescence for XRCC1, PARP1, DAPI or ADP-ribose. b, Quantification of ADP-ribose intensity in the nucleus from >3500 cells per sample from a (data from single experiment). c, Western blot showing XRCC1 and PARP1 protein levels in the indicated RPE-1 cell lines.