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• W4360986211 abstract "The retinoblastoma tumor suppressor protein (RB) interacts physically and functionally with a number of epigenetic modifying enzymes to control transcriptional regulation, respond to replication stress, promote DNA damage response and repair pathways, and regulate genome stability. To better understand how disruption of RB function impacts epigenetic regulation of genome stability and determine whether such changes may represent exploitable weaknesses of RB-deficient cancer cells, we performed an imaging-based screen to identify epigenetic inhibitors that promote DNA damage and compromise viability of RB-deficient cells. We found that loss of RB alone leads to high levels of replication-dependent poly-ADP ribosylation (PARylation) and that preventing PARylation through inhibition of PARP enzymes enables RB-deficient cells to progress to mitosis with unresolved replication stress and under-replicated DNA. These defects contribute to high levels of DNA damage, decreased proliferation, and compromised cell viability. We demonstrate this sensitivity is conserved across a panel of inhibitors that target both PARP1 and PARP2 and can be suppressed by re-expression of the RB protein. Together, these data indicate that inhibitors of PARP1 and PARP2 may be clinically relevant for RB-deficient cancers." @default.
• W4360986211 created "2023-03-30" @default.
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• W4360986211 date "2023-03-25" @default.
• W4360986211 modified "2023-09-27" @default.
• W4360986211 title "RB loss sensitizes cells to replication-associated DNA damage by PARP inhibition" @default.
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• W4360986211 doi "https://doi.org/10.1101/2023.03.25.532215" @default.
• W4360986211 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36993348" @default.
• W4360986211 hasPublicationYear "2023" @default.
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