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Updated: Aug 23, 2025
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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
Published on: April 13, 2015
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Telomeres, Telomerase and Cancer
1Terry Fox Laboratory, BC Cancer Research Institute, Vancouver, Canada; Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
Archives of Medical Research
|November 5, 2022
Summary
Human aging is driven by three clocks: DNA development, accumulating mutations, and telomere shortening. Telomere shortening protects against early cancer but limits cell renewal later in life, contributing to aging.
Area of Science:
- Gerontology
- Molecular Biology
- Cancer Research
Background:
- Human aging and cancer are intricately linked to telomeres and telomerase.
- Three primary "drivers" of aging have been identified, influencing lifespan and cellular function.
- The stability of the genome and epigenome is crucial for development and is challenged by DNA damage and epigenetic alterations over time.
Purpose of the Study:
- To elucidate the roles of three key "drivers" in human aging: developmental programming, genomic/epigenomic damage, and telomere dynamics.
- To explain how these drivers interact to influence cellular function, aging, and the development of cancer.
- To describe aging as a process governed by three distinct "clocks".
Main Methods:
- Conceptual framework integrating DNA developmental programs, (epi)mutational accumulation, and telomere attrition.
- Analysis of the interplay between genetic mutations, epigenetic alterations, and telomere length in aging and cancer.
- Examination of tumor suppression mechanisms, including telomere erosion and its regulation in long-lived species.
Main Results:
- Aging is characterized by three "clocks": the developmental program, the accumulation of (epi)mutations, and telomere shortening.
- Telomere erosion acts as a tumor suppressor early in life but limits cell renewal later, aligning with antagonistic pleiotropy.
- Cancer arises when mutations/epimutations disrupt development and overcome telomere-based tumor suppression, often involving p53 loss and telomerase reactivation.
Conclusions:
- Human aging can be understood as the synchronized ticking of three clocks: development, mutation accumulation, and telomere attrition.
- Telomere dynamics play a dual role, protecting against cancer while limiting cellular regeneration, thus contributing to aging.
- Understanding these three drivers provides a comprehensive model for aging and cancer development.
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