Cited by 308Cancer-related Molecular PathwaysTelomeres, Telomerase, and SenescenceDNA Repair Mechanisms

Chronic p53-independent p21 expression causes genomic instability by deregulating replication licensing

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Galanos, Panagiotis, Vougas, Konstantinos, Walter, David, Polyzos, Alexander, Maya-Mendoza, Apolinar, Haagensen, Emma J., Kokkalis, Antonis, Roumelioti, Fani-Marlen +19 more·2016·Nature Cell Biology

Abstract

The cyclin-dependent kinase inhibitor p21(WAF1/CIP1) (p21) is a cell-cycle checkpoint effector and inducer of senescence, regulated by p53. Yet, evidence suggests that p21 could also be oncogenic, through a mechanism that has so far remained obscure. We report that a subset of atypical cancerous cells strongly expressing p21 showed proliferation features. This occurred predominantly in p53-mutant human cancers, suggesting p53-independent upregulation of p21 selectively in more aggressive tumour cells. Multifaceted phenotypic and genomic analyses of p21-inducible, p53-null, cancerous and near-normal cellular models showed that after an initial senescence-like phase, a subpopulation of p21-expressing proliferating cells emerged, featuring increased genomic instability, aggressiveness and chemoresistance. Mechanistically, sustained p21 accumulation inhibited mainly the CRL4-CDT2 ubiquitin ligase, leading to deregulated origin licensing and replication stress. Collectively, our data reveal the tumour-promoting ability of p21 through deregulation of DNA replication licensing machinery-an unorthodox role to be considered in cancer treatment, since p21 responds to various stimuli including some chemotherapy drugs.

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Crossref · 10.1038/ncb3378

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  • In CIP1-overexpressing TP53-null cultured cancer cells, a transient senescent state was entered but quickly escaped with enhanced cancer stem cell properties and an aggressive phenotype.

    “Similar characteristics were seen in CIP1 -overexpressing TP53 -null cultured cancer cells, which entered a transient senescent state but quickly escaped with enhanced cancer stem cell properties and an aggressive phenotype 190 .”

    From Senescence and cancer — role and therapeutic opportunities (2022) · cites this paper as [190]

    The Results section (page unavailable) reports that p21/CIP1-induced cells in a p53-null model initially became senescent, then a subpopulation escaped and showed greater invasiveness and anchorage-independent growth. It links altered gene expression to cancer “stemness,” but does not establish that the escaped cells had enhanced cancer stem cell properties. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Although the senescence cell-cycle arrest is generally irreversible, cell-cycle re-entry can occur under certain circumstances, particularly in tumor cells.

    “Although the senescence cell-cycle arrest is generally irreversible, cell-cycle re-entry can occur under certain circumstances, particularly in tumor cells (Galanos et al., 2016; Milanovic et al., 2018; Patel et al., 2016; Saleh et al., 2019) (Figure 2).”

    From Cellular Senescence: Defining a Path Forward (2019) · cites this paper as Galanos et al., 2016

  • Because p21 overexpression caused downregulation of RAD51, DSBs were processed by error-prone pathways including RAD52-dependent break-induced replication and single-strand annealing, and possibly nonhomologous end-joining.

    “Because p21 overexpression caused the downregulation of RAD51 [71], DSBs were processed by error-prone pathways, including RAD52-dependent break-induced replication (BIR) and single-strand annealing (SSA) [75], and possibly nonhomologous end-joining [71].”
  • These observations indicate a pro-oncogenic role of p21, at least in p53-negative cancer.

    “Because both rereplication and error-prone DSB repair fuel genomic instability, these observations indicate a pro-oncogenic role of p21, at least in p53-negative cancer [71,75].”
  • Replication-fork progression was asymmetric and slow, and DSBs accumulated in a manner that depended on CDT1 and CDC6 overexpression.

    “Moreover, replication-fork progression was asymmetric and slow, and DSBs accumulated in a manner that depended on CDT1 and CDC6 overexpression.”

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Authors
Galanos, P., Vougas, K., Walter, D., Polyzos, A., Maya-Mendoza, A., Haagensen, E. J., Kokkalis, A., Roumelioti, F.-M., Gagos, S., Tzetis, M., Canovas, B., Igea, A., Ahuja, A. K., Zellweger, R., Havaki, S., Kanavakis, E., Kletsas, D., Roninson, I. B., Garbis, S. D., Lopes, M., Nebreda, A., Thanos, D., Blow, J. J., Townsend, P., Sørensen, C. S., Bartek, J., & Gorgoulis, V. G.
Affiliations
  • National and Kapodistrian University of Athens (GR)
  • Biomedical Research Foundation of the Academy of Athens (GR)
  • University of Copenhagen (DK)
  • University of Dundee (GB)
  • Institute for Research in Biomedicine (ES)
  • University of Zurich (CH)
  • National Centre of Scientific Research "Demokritos" (GR)
  • University of South Carolina (US)
  • University of Southampton (GB)
  • Manchester Academic Health Science Centre (GB)
Corresponding author
Gorgoulis, Vassilis G.
Venue
Nature Cell Biology
Published
2016-06-20
Volume
18
Issue
7
Pages
777-789
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W2470774921
Cited by
308
References
90
Citations by year
2026: 18 · 2025: 29 · 2024: 35 · 2023: 29 · 2022: 26 · 2021: 40 · 2020: 22 · 2019: 37 · 2018: 25 · 2017: 27 · 2016: 20
FWCI
19.60
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • ePrints Soton (University of Southampton) (acceptedVersion)
  • RECERCAT (Consorci de Serveis Universitaris de Catalunya) (acceptedVersion)
  • Discovery Research Portal (University of Dundee) (submittedVersion, other-oa)
  • Dipòsit Digital de la Universitat de Barcelona (Universitat de Barcelona) (submittedVersion, public-domain)
  • Research Explorer (The University of Manchester) (submittedVersion, other-oa)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
  • UEA Digital Repository (University of East Anglia) (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity) (cc-by-nc)
Funders
  • Wellcome Trust (096598, 096598/Z/11/Z, 097945/C/11/Z)
  • European Commission (284460)
  • General Secretariat for Research and Technology
  • Lundbeckfonden (R93-2011-8990)
  • Novo Nordisk Fonden (NNF15OC0016584, NNF12OC0002290)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
p21, genomic instability, replication licensing, replication stress, senescence, chemoresistance, tumor aggressiveness, cell proliferation
MeSH terms
Cells, Cultured, DNA Replication, Humans, Neoplasms, Tumor Suppressor Protein p53, Cyclins, Genomic Instability, Cyclin-Dependent Kinase Inhibitor p21

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