The replication checkpoint prevents fork stalling by reducing transcription
- 1Univ. Montpellier - Institute of Human Genetics - CNRS - Institut Universitaire de France
Abstract
The replication checkpoint is essential for maintaining genome stability during replication stress. The prevailing view is that, without this pathway, stalled DNA replication forks lose structural integrity and collapse, preventing replication resumption and ultimately causing cell death. Here, we show that transcription is a major cause of replication stress in budding yeast checkpoint mutants. Checkpoint signaling limits replication defects by reducing RNA polymerase II and III occupancy at highly transcribed genes, particularly those encoding ribosomal proteins. Reducing transcription at these loci reduces fork stalling and the sensitivity of checkpoint mutants to hydroxyurea-induced replication stress. In human cells, transcription inhibition likewise improves replication recovery when ATR is inhibited, suggesting that this function is conserved. Together, our findings extend the canonical view of critical checkpoint functions: in addition to stabilizing stalled forks, it actively reduces RNA polymerase roadblocks that would otherwise impede their progression.
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BibTeX
@misc{heuze2026replication,
title = {{The replication checkpoint prevents fork stalling by reducing transcription}},
author = {J. Heuze and S. Grassin and P. Pasero and J. Poli},
howpublished = {bioRxiv},
year = {2026},
month = oct,
doi = {10.64898/2026.10.17.759807},
url = {https://www.biorxiv.org/content/10.64898/2026.10.17.759807v1},
note = {CC BY-NC-ND},
}
RIS
TY - UNPB
TI - The replication checkpoint prevents fork stalling by reducing transcription
AU - J. Heuze
AU - S. Grassin
AU - P. Pasero
AU - J. Poli
PY - 2026
DA - 2026/10/17
PB - bioRxiv
DO - 10.64898/2026.10.17.759807
UR - https://www.biorxiv.org/content/10.64898/2026.10.17.759807v1
AB - The replication checkpoint is essential for maintaining genome stability during replication stress. The prevailing view is that, without this pathway, stalled DNA replication forks lose structural integrity and collapse, preventing replication resumption and ultimately causing cell death. Here, we show that transcription is a major cause of replication stress in budding yeast checkpoint mutants. Checkpoint signaling limits replication defects by reducing RNA polymerase II and III occupancy at highly transcribed genes, particularly those encoding ribosomal proteins. Reducing transcription at these loci reduces fork stalling and the sensitivity of checkpoint mutants to hydroxyurea-induced replication stress. In human cells, transcription inhibition likewise improves replication recovery when ATR is inhibited, suggesting that this function is conserved. Together, our findings extend the canonical view of critical checkpoint functions: in addition to stabilizing stalled forks, it actively reduces RNA polymerase roadblocks that would otherwise impede their progression.
ER -