Williams, Sophie L;
Casas-Delucchi, Corella S;
Raguseo, Federica;
Guneri, Dilek;
Li, Yunxuan;
Minamino, Masashi;
Fletcher, Emma E;
... Coster, Gideon; + view all
(2023)
Replication-induced DNA secondary structures drive fork uncoupling and breakage.
EMBO Journal
, Article e114334. 10.15252/embj.2023114334.
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Abstract
Sequences that form DNA secondary structures, such as G-quadruplexes (G4s) and intercalated-Motifs (iMs), are abundant in the human genome and play various physiological roles. However, they can also interfere with replication and threaten genome stability. Multiple lines of evidence suggest G4s inhibit replication, but the underlying mechanism remains unclear. Moreover, evidence of how iMs affect the replisome is lacking. Here, we reconstitute replication of physiologically derived structure-forming sequences to find that a single G4 or iM arrest DNA replication. Direct single-molecule structure detection within solid-state nanopores reveals structures form as a consequence of replication. Combined genetic and biophysical characterisation establishes that structure stability and probability of structure formation are key determinants of replisome arrest. Mechanistically, replication arrest is caused by impaired synthesis, resulting in helicase-polymerase uncoupling. Significantly, iMs also induce breakage of nascent DNA. Finally, stalled forks are only rescued by a specialised helicase, Pif1, but not Rrm3, Sgs1, Chl1 or Hrq1. Altogether, we provide a mechanism for quadruplex structure formation and resolution during replication and highlight G4s and iMs as endogenous sources of replication stress.
| Type: | Article |
|---|---|
| Title: | Replication-induced DNA secondary structures drive fork uncoupling and breakage |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.15252/embj.2023114334 |
| Publisher version: | https://doi.org/10.15252/embj.2023114334 |
| Language: | English |
| Additional information: | This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | DNA replication, DNA secondary structures, G-quadruplex and i-Motif, genome stability, replication stress |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy > Pharma and Bio Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10178690 |
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