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Related Concept Videos

Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

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Related Experiment Video

Updated: Jul 5, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
08:34

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Published on: April 13, 2015

Telomere dysfunction and tumour suppression: the senescence connection.

Yibin Deng1, Suzanne S Chan, Sandy Chang

  • 1Department of Cancer Genetics, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030, USA.

Nature Reviews. Cancer
|May 27, 2008
PubMed
Summary

Dysfunctional telomeres trigger a DNA damage response, activating p53. This leads to either apoptosis or senescence, both crucial for suppressing tumor growth in humans.

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SA-&#946;-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs
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SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs

Published on: June 28, 2019

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Last Updated: Jul 5, 2026

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
08:34

Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer

Published on: April 13, 2015

SA-&#946;-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs
07:39

SA-β-Galactosidase-Based Screening Assay for the Identification of Senotherapeutic Drugs

Published on: June 28, 2019

Area of Science:

  • Cellular biology
  • Genetics
  • Cancer research

Background:

  • Long-lived organisms possess intrinsic tumor suppressor mechanisms.
  • Telomeres, protective caps on chromosomes, are key anticancer barriers.
  • Telomere dysfunction activates DNA damage response pathways.

Purpose of the Study:

  • To discuss the role of p53-dependent senescence in tumor suppression.
  • To compare the potency of senescence versus apoptosis in preventing cancer.

Main Methods:

  • Review of intrinsic tumor suppressor mechanisms.
  • Analysis of the DNA damage response pathway.
  • Discussion of p53's role in senescence and apoptosis.

Main Results:

  • Impaired telomere function activates the p53 pathway.
  • p53 can initiate either apoptosis or replicative senescence.
  • p53-dependent senescence is a potent tumor suppressor mechanism.

Conclusions:

  • Telomere integrity is crucial for preventing oncogenic mutations.
  • p53-mediated senescence is as effective as apoptosis in suppressing tumorigenesis.
  • Understanding these mechanisms aids in cancer prevention strategies.