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• W2057062021 abstract "To better understand the different cellular responses to replication fork pausing versus blockage, early DNA damage response markers were compared after treatment of cultured mammalian cells with agents that either inhibit DNA polymerase activity (hydroxyurea (HU) or aphidicolin) or selectively induce S-phase DNA damage responses (the DNA alkylating agents, methyl methanesulfonate (MMS) and adozelesin). These agents were compared for their relative abilities to induce phosphorylation of Chk1, H2AX, and replication protein A (RPA), and intra-nuclear focalization of gamma-H2AX and RPA. Treatment by aphidicolin and HU resulted in phosphorylation of Chk1, while HU, but not aphidicolin, induced focalization of gamma-H2AX and RPA. Surprisingly, pre-treatment with aphidicolin to stop replication fork progression, did not abrogate HU-induced gamma-H2AX and RPA focalization. This suggests that HU may act on the replication fork machinery directly, such that fork progression is not required to trigger these responses. The DNA-damaging fork-blocking agents, adozelesin and MMS, both induced phosphorylation and focalization of H2AX and RPA. Unlike adozelesin and HU, the pattern of MMS-induced RPA focalization did not match the BUdR incorporation pattern and was not blocked by aphidicolin, suggesting that MMS-induced damage is not replication fork-dependent. In support of this, MMS was the only reagent used that did not induce phosphorylation of Chk1. These results indicate that induction of DNA damage checkpoint responses due to adozelesin is both replication fork and fork progression dependent, induction by HU is replication fork dependent but progression independent, while induction by MMS is independent of both replication forks and fork progression." @default.
• W2057062021 created "2016-06-24" @default.
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• W2057062021 date "2003-11-27" @default.
• W2057062021 modified "2023-09-27" @default.
• W2057062021 title "Comparison of checkpoint responses triggered by DNA polymerase inhibition versus DNA damaging agents" @default.
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• W2057062021 doi "https://doi.org/10.1016/j.mrfmmm.2003.08.018" @default.
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