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Related Concept Videos

Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
The Retinoblastoma Gene01:20

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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.
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The Retinoblastoma Gene01:20

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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.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
Loss of Tumor Suppressor Gene Functions01:12

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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.
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Loss of Tumor Suppressor Gene Functions01:12

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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.
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Updated: Jun 1, 2026

Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

pRB, a tumor suppressor with a stabilizing presence.

Amity L Manning1, Nicholas J Dyson

  • 1Massachusetts General Hospital Cancer Center and Harvard Medical School, Charlestown, USA. almanning@partners.org

Trends in Cell Biology
|June 14, 2011
PubMed
Summary

The retinoblastoma tumor suppressor protein (pRB) is crucial for preventing uncontrolled cell growth and maintaining genome stability. Its inactivation promotes tumor development and therapeutic resistance by disrupting cell division.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The retinoblastoma tumor-susceptibility gene (RB1) product, pRB, is a critical regulator of cell proliferation.
  • Inactivation of pRB has been linked to uncontrolled cell proliferation, genomic instability, and aneuploidy.
  • These alterations are associated with tumor evolution, therapeutic resistance, and relapse.

Purpose of the Study:

  • To review the evidence supporting pRB's role in promoting genome stability.
  • To discuss the mechanisms by which pRB maintains genomic integrity.
  • To highlight the implications for understanding tumor progression and identifying therapeutic targets.

Main Methods:

  • Literature review of studies investigating pRB function in cell cycle regulation and chromosome segregation.
  • Analysis of experimental data linking pRB inactivation to genomic instability.
  • Synthesis of current knowledge on pRB's mechanisms of action in maintaining chromosomal fidelity.

Main Results:

  • pRB actively promotes genome stability by regulating cell cycle progression and ensuring accurate chromosome segregation.
  • Loss of pRB function leads to mitotic errors, aneuploidy, and increased susceptibility to tumor development.
  • Genomic instability resulting from pRB inactivation contributes to tumor aggressiveness and treatment failure.

Conclusions:

  • pRB plays a vital role in preventing cancer initiation and progression by maintaining genomic stability.
  • Understanding pRB's mechanisms in chromosome segregation offers insights into misregulated processes in human tumors.
  • Targeting pathways affected by pRB loss could yield novel therapeutic strategies for chromosomally unstable cancers.