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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...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Negative Regulator Molecules01:23

Negative Regulator Molecules

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.
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
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Updated: Jul 10, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

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Published on: August 4, 2019

p53 and Mdm2: not all cells are equal.

P J Coates1

  • 1Cancer Biology and Clinical Pathology, Division of Pathology and Neurosciences, University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK. p.j.coates@dundee.ac.uk

The Journal of Pathology
|November 2, 2007
PubMed
Summary

The tumor suppressor gene TP53 (p53) uniquely impacts cell growth in different tissues. This study reveals p53 blocks progenitor cell expansion in blood and sperm development but not in certain epithelial tissues.

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Last Updated: Jul 10, 2026

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cancer Biology

Background:

  • The TP53 gene, encoding the p53 protein, is a critical tumor suppressor.
  • The role of p53 in postnatal development and its cell-type specific functions are not fully understood.
  • Existing research often assumes p53 functions uniformly across all cell types.

Purpose of the Study:

  • To investigate the cell-type specific effects of p53 on postnatal development.
  • To determine if p53's role as a tumor suppressor varies depending on the tissue.
  • To challenge the generalized view of p53's function.

Main Methods:

  • The study by Lozano and colleagues utilized experimental models to assess p53's impact on progenitor cell expansion.
  • Specific tissues examined included hematopoietic, spermatogenic, and epithelial tissues.
  • Comparative analysis of p53's function across different cell lineages was performed.

Main Results:

  • p53 was found to inhibit progenitor cell expansion in both haematopoiesis (blood cell development) and spermatogenesis (sperm development).
  • Conversely, p53 did not block progenitor cell expansion in specific epithelial tissues examined.
  • These findings demonstrate a differential effect of p53 depending on the cell type and developmental context.

Conclusions:

  • The function of the TP53 gene (p53) is not uniform across all cell types, exhibiting distinct roles in different tissues.
  • p53's ability to block progenitor cell expansion is context-dependent, affecting some developmental processes more than others.
  • These cell-type specific effects have significant implications for developing targeted p53-based cancer therapeutics.