Cited by 112Cancer-related Molecular PathwaysDNA Repair MechanismsMathematical Biology Tumor Growth

Distinct mechanisms act in concert to mediate cell cycle arrest

Open access
Toettcher, Jared E., Loewer, Alexander, Ostheimer, Gerard J., Yaffe, Michael B., Tidor, Bruce, Lahav, Galit·2009·Proceedings of the National Academy of Sciences

Abstract

In response to DNA damage, cells arrest at specific stages in the cell cycle. This arrest must fulfill at least 3 requirements: it must be activated promptly; it must be sustained as long as damage is present to prevent loss of genomic information; and after the arrest, cells must re-enter into the appropriate cell cycle phase to ensure proper ploidy. Multiple molecular mechanisms capable of arresting the cell cycle have been identified in mammalian cells; however, it is unknown whether each mechanism meets all 3 requirements or whether they act together to confer specific functions to the arrest. To address this question, we integrated mathematical models describing the cell cycle and the DNA damage signaling networks and tested the contributions of each mechanism to cell cycle arrest and re-entry. Predictions from this model were then tested with quantitative experiments to identify the combined action of arrest mechanisms in irradiated cells. We find that different arrest mechanisms serve indispensable roles in the proper cellular response to DNA damage over time: p53-independent cyclin inactivation confers immediate arrest, whereas p53-dependent cyclin downregulation allows this arrest to be sustained. Additionally, p21-mediated inhibition of cyclin-dependent kinase activity is indispensable for preventing improper cell cycle re-entry and endoreduplication. This work shows that in a complex signaling network, seemingly redundant mechanisms, acting in a concerted fashion, can achieve a specific cellular outcome.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1073/pnas.0806196106

Cites

39 of 39 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • A model proposes that cells stably blocked in G2 undergo mitotic bypass into tetraploid G1, where p21-mediated inhibition of cyclin E1-Cdk2 prevents replication.

    “A model originally proposed by the Lahav group suggests that cells stably blocked in G2 eventually undergo mitotic bypass -a passage from G2 to G1 without chromosome segregation -and enter a tetraploid G1 phase where they cannot replicate due to p21-mediated inhibition of cyclin E1-Cdk2.89”

    From Senescence from G2 arrest, revisited (2015) · cites this paper as [89]

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 40 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Toettcher, J. E., Loewer, A., Ostheimer, G. J., Yaffe, M. B., Tidor, B., & Lahav, G.
Affiliations
  • Harvard University (US)
  • Center for Cancer Research (US)
  • Massachusetts Institute of Technology (US)
Corresponding author
  • Toettcher, Jared E.
  • Loewer, Alexander
  • Lahav, Galit
Venue
Proceedings of the National Academy of Sciences
Published
2009-01-20
Volume
106
Issue
3
Pages
785-790
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2041969498
Cited by
112
References
40
Citations by year
2026: 1 · 2025: 1 · 2024: 7 · 2023: 3 · 2022: 7 · 2021: 7 · 2020: 5 · 2019: 10 · 2018: 7 · 2017: 4 · 2016: 3 · 2015: 6 · 2014: 7 · 2013: 9 · 2012: 6
FWCI
5.83
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (CA112967)
  • National Cancer Institute (U54CA112967)
  • National Institute of General Medical Sciences (R01GM083303, GM083303, R01GM058762, R01GM065418, P50 GM58762)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Physical Sciences › Mathematics › Modeling and Simulation › Mathematical Biology Tumor Growth
Keywords
cell cycle arrest, DNA damage response, p21, cyclin-dependent kinase inhibition, cell cycle re-entry, endoreduplication, ionizing radiation, genome stability
MeSH terms
Cell Cycle, DNA Damage, Humans, Models, Biological, Tumor Suppressor Protein p53, G1 Phase, G2 Phase, Cyclins, HCT116 Cells, Cyclin-Dependent Kinase Inhibitor p21

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review