Cited by 979Telomeres, Telomerase, and SenescenceCancer-related Molecular PathwaysGenetics, Aging, and Longevity in Model Organisms

The DOI matches its Crossref record; 32 of the 44 references it cites were found in a registry or an index, and 12 are not checked yet; none of the 37 sources its claims cite is checked for support yet.

p53 Deficiency Rescues the Adverse Effects of Telomere Loss and Cooperates with Telomere Dysfunction to Accelerate Carcinogenesis

Open access

Abstract

Maintenance of telomere length and function is critical for the efficient proliferation of eukaryotic cells. Here, we examine the interactions between telomere dysfunction and p53 in cells and organs of telomerase-deficient mice. Coincident with severe telomere shortening and associated genomic instability, p53 is activated, leading to growth arrest and/or apoptosis. Deletion of p53 significantly attenuated the adverse cellular and organismal effects of telomere dysfunction, but only during the earliest stages of genetic crisis. Correspondingly, the loss of telomere function and p53 deficiency cooperated to initiate the transformation process. Together, these studies establish a key role for p53 in the cellular response to telomere dysfunction in both normal and neoplastic cells, question the significance of crisis as a tumor suppressor mechanism, and identify a biologically relevant stage of advanced crisis, termed genetic catastrophe.

Checked 2026-10-06 · 12 references not checked yet

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

In telomerase-deficient (mTR−/−) mice, critically short telomeres activate p53, and deleting p53 rescues the resulting apoptosis and cell-cycle arrest — but only during early "crisis." Loss of telomere function and p53 deficiency cooperate to initiate transformation, while telomerase reconstitution mainly benefits later stages of tumorigenesis.

Key findings

  • Critical telomere shortening activates p53: p53 protein was detectable in G6 mTR−/− testis but not in mTR+/+ or G6 mTR−/− p53−/− littermates; >80% of G4 and G6 MEFs stained positive for p53 at passage 6 versus 21% of mTR+/+ MEFs. p21CIP1/WAF1 rose 3- to 4-fold in G6 versus G2 mTR−/− p53+/+ MEFs, and p53-dependent CAT reporter activity increased ~2-fold.
  • p53 loss rescued telomere-dysfunction phenotypes early but not late: 15% of G4–G6 mTR−/− mice (86/565) were p53−/− versus 26% of G7–G8 mice (24/91) (p = 0.015); all G5 mTR−/− p53−/− testes had normal histology, but 3 of 7 G6 and all five G7–G8 samples showed germ cell depletion. G6 mTR−/− p53−/− MEFs showed a 3-fold increase in chromosome fusions (1.65, SD 2.59 vs 0.42, SD 0.71 per metaphase; p = 0.012), with no change in telomere length (75% reduction regardless of p53 status).
  • Telomere dysfunction cooperated with p53 deficiency to initiate transformation: adding mTR suppressed Myc/RAS focus formation in G6 mTR−/− p53−/− MEFs, but mTR-transfected foci had higher subcloning efficiency (23/26, 89%) than vector foci (19/32, 59%; p = 0.018). Tumor formation in SCID mice was similar between groups.
  • The authors propose dividing crisis into p53-dependent "early crisis" and p53-independent "genetic catastrophe," questioning crisis as a tumor suppressor mechanism.

Methods

  • Mouse genetics: mTR+/− mice crossed with p53+/− mice to generate successive generations (G1–G8) of mTR−/− animals with p53+/+, +/−, and −/− genotypes in a mixed WW6/C57BL/6 background; p53 status maintained heterozygous during matings.
  • Cellular/organ assays: immunoblotting and immunohistochemistry for p53 and p21, pG13CAT reporter assays, testis histology with TUNEL, BrdU/propidium iodide FACS cell-cycle profiles, flow FISH telomere length, and metaphase spreads for chromosome fusions.
  • Transformation assays: Myc/RAS cotransfection of early-passage MEFs with empty vector or an mTR genomic fragment, scoring focus formation, subcloning efficiency, and tumor formation after subcutaneous injection into SCID mice.

Limitations

  • Stated: the mechanisms by which tumorigenic potential is maintained in late stages of tumorigenesis despite telomere dysfunction "remain to be determined"; whether loss of TRF2 binding, short telomeres, or fusion-bridge-breakage cycles mediate the p53 induction described also remains undetermined.
  • Evident from the text: the G7–G8 genotype comparison rests on small numbers (24 of 91 mice), and all mice are in a mixed genetic background, which the authors note required cousin mating to avoid substrains.
  • Evident from the text: the transformation data are from cultured MEFs and SCID xenografts, and tumor weights/efficiency between mTR and vector lines were not significantly different, so the in vivo relevance of the initiation advantage is inferred rather than directly demonstrated.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/s0092-8674(00)80762-x

Cites

32 of 44 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

40 Own interpretation · 39 Own result · 22 Not checked yet · 6 Own method · 4 No basis given

Verify all 37 references — free account

Show all 62 claims

  • It may state two separate claims as one. 36
  • The quote only partly states this claim. 1
  • Probably not a substantial claim. 16
49 of 49
  • The paper relies on this without support.

    The signals and pathways mediating the cellular responses associated with telomere dysfunction have yet to be defined in mammalian cells.

    “The signals and pathways mediating these cellular responses associated with telomere dysfunction have yet to be defined in mammalian cells.”
  • The paper relies on this without support.

    The RAD9 and MEC1 DNA damage response pathways in yeast are similar to the p53 checkpoint in mammalian cells.

    “The RAD9 and MEC1 DNA damage response pathways in yeast are thought to be similar to the p53 checkpoint in mammalian cells.”
  • The paper relies on this without support.

    The mTR−/− mouse is a valid model for studying the consequences of telomere loss in vivo.

    “The mTR−/− mouse serves as a model to study the consequences of telomere loss in vivo.”
  • The paper relies on this without support.

    Focus formation reflects the earliest stages of oncogenic transformation.

    “Focus formation is thought to reflect the earliest stages of oncogenic transformation.”
  • The paper relies on this without support.

    Human cells require inactivation of Rb and/or p53 to bypass the major checkpoint that limits replicative lifespan: cellular senescence.

    “Human cells require inactivation of Rb and/or p53 to bypass the major checkpoint that limits replicative lifespan: cellular senescence.”
  • The paper relies on this without support.

    Rb/p53 inactivation allows continued cell division beyond senescence, progressive telomere shortening, and entry into crisis, from which only rare survivors emerge.

    “Rb/p53 inactivation allows continued cell division beyond senescence, progressive telomere shortening, and entry into crisis, from which only rare survivors will emerge.”
  • The paper relies on this without support.

    Many human tumors that are telomerase positive still have short telomeres.

    “The fact that many human tumors that are telomerase positive still have short telomeres supports the idea that telomerase activation occurs late in tumorigenesis.”
7 of 7

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?

Citations

Cites

Show all 44 references

Cited by

Sorted by citations

Items 701–800 of 975

Metadata

Authors
Chin, L., Artandi, S. E., Shen, Q., Tam, A., Lee, S.-L., Gottlieb, G. J., Greider, C. W., & DePinho, R. A.
Affiliations
  • Harvard University (US)
  • Dana-Farber Cancer Institute (US)
  • Quest Diagnostics (United States) (US)
  • Johns Hopkins University (US)
Corresponding author
DePinho, Ronald A
Venue
Cell
Publisher
Elsevier BV
Published
1999-05
Volume
97
Issue
4
Pages
527-538
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2027779909
Cited by
979
References
44
Citations by year
2026: 10 · 2025: 12 · 2024: 18 · 2023: 21 · 2022: 15 · 2021: 22 · 2020: 15 · 2019: 26 · 2018: 24 · 2017: 23 · 2016: 32 · 2015: 34 · 2014: 23 · 2013: 40 · 2012: 51
FWCI
36.05
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01hd028317-05, 5r01hd034880-04, 5k08ar002104-04)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (K08AR02104-01)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD34880, R01 HD28317)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
p53, telomere dysfunction, telomere shortening, telomerase deficiency, telomere crisis, carcinogenesis, genomic instability, tumor suppression, apoptosis, growth arrest, telomere length
MeSH terms
Animals, Male, Mice, Inbred C57BL, Neoplasms, Phenotype, Spermatozoa, Testis, Tumor Suppressor Protein p53, Telomere, Apoptosis, Telomerase, Mice

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.

A language model drew the claims from the paper on 2026-10-06, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).

A second model labelled each claim on 2026-10-06 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).

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