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- W3207174324 abstract "Abstract Topoisomerase II (Top2) unlinks chromosomes during vertebrate DNA replication. Top2 ‘poisons’ are widely-used chemotherapeutics that stabilize Top2 complexes on DNA, leading to cytotoxic DNA breaks. However, it is unclear how these drugs affect DNA replication, which is a major target of Top2 poisons. Using Xenopus egg extracts, we show that the Top2 poisons etoposide and doxorubicin both inhibit DNA replication through different mechanisms. Etoposide induces Top2-dependent DNA breaks and induces Top2-dependent fork stalling by trapping Top2 behind replication forks. In contrast, doxorubicin does not lead to appreciable break formation and instead intercalates into parental DNA to inhibit replication fork progression. In human cells, etoposide stalls replication forks in a Top2-dependent manner, while doxorubicin stalls forks independently of Top2. However, both drugs exhibit Top2-dependent cytotoxicity. Thus, despite shared genetic requirements for cytotoxicity etoposide and doxorubicin inhibit DNA replication through distinct mechanisms." @default.
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- W3207174324 date "2021-10-12" @default.
- W3207174324 modified "2023-09-27" @default.
- W3207174324 title "Topoisomerase II poisons inhibit vertebrate DNA replication through distinct mechanisms" @default.
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- W3207174324 doi "https://doi.org/10.1101/2021.10.12.464107" @default.
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