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Assembly of TopBP1, a multifunctional scaffolding protein, into condensates is required to amplify ATR kinase activity to the levels needed to coordinate the DNA damage response and manage DNA replication stress. Many ATR inhibitors are tested for cancer treatment in clinical trials, but their overall effectiveness is often compromised by the emergence of resistance and toxicities. In this proof-of-concept study, we propose to disrupt the ATR pathway by targeting TopBP1 condensation. First, we screened a molecule-based library using a previously developed optogenetic approach and identified several TopBP1 condensation inhibitors. Among them, AZD2858 disrupted TopBP1 assembly induced by the clinically relevant topoisomerase I inhibitor SN-38, thereby inhibiting the ATR\/Chk1 signaling pathway. We found that AZD2858 exerted its effects by disrupting TopBP1 self-interaction and binding to ATR in mammalian cells, and by increasing its chromatin recruitment in cell-free\n                    <jats:italic>Xenopus laevis<\/jats:italic>\n                    egg extracts. Moreover, AZD2858 prevented S-phase checkpoint induction by SN-38, leading to increased DNA damage and apoptosis in a colorectal cancer cell line. Lastly, AZD2858 showed a synergistic effect in combination with the FOLFIRI chemotherapy regimen in a spheroid model of colorectal cancer.\n                  <\/jats:p>","DOI":"10.7554\/elife.106196","type":"journal-article","created":{"date-parts":[[2025,5,15]],"date-time":"2025-05-15T10:30:56Z","timestamp":1747305056000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.106196","source":"Crossref","is-referenced-by-count":1,"title":["TopBP1 biomolecular condensates as a new therapeutic target in advanced-stage colorectal cancer"],"prefix":"10.7554","volume":"14","author":[{"given":"Laura","family":"Morano","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05ee10k25","id-type":"ROR","asserted-by":"publisher"}],"name":"Institut de G\u00e9n\u00e9tique Humaine, Universit\u00e9 de Montpellier, CNRS","place":["Montpellier, 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