ArticleMolecular biology of the cell2010
Enhanced H2AX phosphorylation, DNA replication fork arrest, and cell death in the absence of Chk1.
Article in Molecular biology of the cell, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 101 papers.
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Who cites it
101 citing papers in PubMed, 142 citations in OpenAlex.
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- Replication stress responses in human lymphocytes change sex-specifically during aging.Nucleic acids research · 2025Article
- BMP signaling promotes zebrafish heart regeneration via alleviation of replication stress.Nature communications · 2025Article
- PFKFB3-dependent redox homeostasis and DNA repair support cell survival under EGFR-TKIs in non-small cell lung carcinoma.Cancer & metabolism · 2024Article
- O-GlcNAcylation of RPA2 at S4/S8 antagonizes phosphorylation and regulates checkpoint activation during replication stress.The Journal of biological chemistry · 2024Article
- The levels of p53 govern the hierarchy of DNA damage tolerance pathway usage.Nucleic acids research · 2024Article
- DAXX promotes centromeric stability independently of ATRX by preventing the accumulation of R-loop-induced DNA double-stranded breaks.Nucleic acids research · 2024Article
- Disentangling the roles of aneuploidy, chromosomal instability and tumour heterogeneity in developing resistance to cancer therapies.Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology · 2023Review
41 more citing papers are in PubMed but not listed here.
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
H2AX phosphorylation at serine 139 (gammaH2AX) is a sensitive indicator of both DNA damage and DNA replication stress. Here we show that gammaH2AX formation is greatly enhanced in response to replication inhibitors but not ionizing radiation in HCT116 or SW480 cells depleted of Chk1. Although H2AX phosphorylation precedes the induction of apoptosis in such cells, our results suggest that cells containing gammaH2AX are not committed to death. gammaH2AX foci in these cells largely colocalize with RPA foci and their formation is dependent upon the essential replication helicase cofactor Cdc45, suggesting that H2AX phosphorylation occurs at sites of stalled forks. However Chk1-depleted cells released from replication inhibitors retain gammaH2AX foci and do not appear to resume replicative DNA synthesis. BrdU incorporation only occurs in a minority of Chk1-depleted cells containing gammaH2AX foci after release from thymidine arrest and, in cells incorporating BrdU, DNA synthesis does not occur at sites of gammaH2AX foci. Furthermore activated ATM and Chk2 persist in these cells. We propose that the gammaH2AX foci in Chk1-depleted cells may represent sites of persistent replication fork damage or abandonment that are unable to resume DNA synthesis but do not play a direct role in the Chk1 suppressed death pathway.
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