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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...
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.
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...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...

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Drosophila p53 isoforms differentially regulate apoptosis and apoptosis-induced proliferation.

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Related Experiment Video

Updated: Jul 13, 2026

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

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

Published on: August 4, 2019

p53 and its isoforms in cancer.

J-C Bourdon1

  • 1Inserm European Associated Laboratory, Department of Surgery and Molecular Oncology, University of Dundee, Inserm U858, CR-UK Cell Transformation Research Group, Dundee, UK. j.bourdon@dundee.ac.uk

British Journal of Cancer
|July 20, 2007
PubMed
Summary

The p53 gene family, crucial for preventing cancer, has complex isoform expressions in tumors. Accurately assessing tumor p53 status requires analyzing these isoforms alongside mutations and target genes for better cancer therapy insights.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The p53 gene family (p53, p63, p73) plays vital roles in development, differentiation, and stress response.
  • p53 is a critical tumor suppressor, essential for preventing cancer formation, with its pathway inactivated in nearly all human cancers via mutation or signaling disruption.
  • Understanding p53's tumor suppressor activity is key to advancing cancer therapy, yet clinical links between p53 status and treatment outcomes remain challenging.

Purpose of the Study:

  • To explore the impact of p53 isoforms on tumor suppressor activity and cancer progression.
  • To highlight the complexity of p53 regulation in normal and cancerous tissues.
  • To advocate for a more comprehensive approach to determining tumor p53 status.

Main Methods:

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Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence

Published on: December 30, 2025

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
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Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Related Experiment Videos

Last Updated: Jul 13, 2026

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

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

Published on: August 4, 2019

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence
04:56

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence

Published on: December 30, 2025

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

  • Analysis of p53 gene family members (p53, p63, p73) and their roles.
  • Review of studies investigating p53 pathway inactivation in human cancers.
  • Examination of the discovery and implications of nine distinct p53 protein isoforms.
  • Comparative studies of p53 isoform expression in tumor versus normal tissues.

    • Main Results:

    • The p53 pathway is frequently inactivated in human cancers, representing a common denominator for all cancer types.
    • The discovery of nine p53 protein isoforms reveals a more complex regulatory network than previously understood.
    • Abnormal expression of p53 isoforms is observed in various tumor types compared to normal cells.
    • p53 isoforms significantly modulate p53 transcriptional activity and influence cell fate decisions under stress.

    Conclusions:

    • The intricate regulation of p53 function by its isoforms necessitates a re-evaluation of its role in cancer.
    • Accurate assessment of tumor p53 status should integrate p53 isoform expression, functional mutation analysis, and specific antibody profiling.
    • A comprehensive understanding of p53 isoform dynamics is crucial for developing effective cancer therapies and improving clinical outcomes.