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Updated: May 5, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
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Short dysfunctional telomeres impair tumorigenesis in the INK4a(delta2/3) cancer-prone mouse

R A Greenberg1, L Chin, A Femino

  • 1Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

Cell
|May 25, 1999
PubMed

Insights

Telomere shortening impairs tumor formation in mice lacking telomerase RNA (mTR) and INK4a. Restoring mTR re-established cancer-promoting potential, highlighting telomere maintenance

Area of Science:

  • Cancer Biology
  • Genetics
  • Cellular Aging

Background:

  • Telomere length maintenance is crucial for cancer cell survival and proliferation.
  • Telomere dysfunction can act as a barrier to tumorigenesis.
  • The interplay between telomere biology and tumor suppressor genes is complex.

Purpose of the Study:

  • To investigate the impact of telomere dysfunction on tumorigenesis in a mouse model.
  • To assess the role of telomerase RNA (mTR) and INK4a in tumor development.
  • To determine if telomerase activation is necessary for malignant transformation in cells with critically short telomeres.

Main Methods:

  • Generated successive generations of mice lacking both telomerase RNA (mTR) and the INK4a tumor suppressor gene.
  • Assessed tumor formation in vivo and oncogenic potential in vitro across generations.
  • Reintroduced mTR into deficient cells to evaluate restoration of oncogenic potential.

Main Results:

  • Late generations of telomerase-deficient mice showed significantly reduced tumor formation and oncogenic potential.
  • Severe telomere shortening and dysfunction were observed in these late generations.
  • Reintroduction of mTR restored the oncogenic potential in cells with critically short telomeres.

Conclusions:

  • Loss of telomere function impairs, but does not completely prevent, tumor formation even in cancer-prone models with intact DNA damage responses.
  • Telomerase activation cooperates with critically short telomeres to promote malignant transformation.
  • Telomere maintenance is a critical factor in cancer development and progression.

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