Leading-strand polymerase stalling at DNA damage impairs replication fork progression. Using biochemical approaches, we show this arises due to both slower template unwinding following helicase-polymerase uncoupling and establishment of prolonged stalled fork structures. Fork slowing and stalling occur at structurally distinct lesions, are always associated with continued lagging-strand synthesis, are observed when either Pol ε or Pol δ stalls at leading-strand damage, and do not require specific helicase-polymerase coupling factors. Hence, the key trigger for these replisome-intrinsic responses is cessation of leading-strand polymerization, revealing this as a crucial driver of normal replication fork rates. We propose that this helps balance the need for sufficient uncoupling to activate the DNA replication checkpoint with excessive destabilizing single-stranded DNA exposure in eukaryotes.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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| Evidence ID | Analyze ID | File | Description |
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