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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.
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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...
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Related Experiment Video

Updated: Jul 18, 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

The p53 network: p53 and its downstream genes.

Kun-Xian Shu1, Biao Li, Li-Xiang Wu

  • 1College of Bioinformation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. kxshu@yahoo.com.cn

Colloids and Surfaces. B, Biointerfaces
|December 26, 2006
PubMed
Summary

The tumor-suppressor gene p53 network is crucial for genetic stability. Understanding its complex interactions with downstream genes and regulatory mechanisms like the P53-MDM2 module is key.

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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

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Last Updated: Jul 18, 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

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • The p53 tumor-suppressor gene is a critical regulator of cellular responses to stress.
  • p53 acts as a central node in a complex gene network essential for maintaining genetic stability.
  • Dysregulation of the p53 pathway is implicated in various cancers.

Purpose of the Study:

  • To elucidate the intricate network of the p53 tumor-suppressor gene and its downstream targets.
  • To understand the molecular mechanisms governing p53 activation and regulation.
  • To explore the role of the p53 gene network in maintaining genetic stability.

Main Methods:

  • Analysis of the p53 gene network structure and function.
  • Investigation of p53 activation by cellular signals.
  • Examination of the P53-MDM2 module and ubiquitin system in p53 regulation.
  • Study of p53 DNA binding and downstream gene activation.

Main Results:

  • p53 is activated by diverse cellular signals, playing a key role in genetic stability.
  • The P53-MDM2 module and ubiquitin system precisely regulate p53 expression levels.
  • p53 binds DNA to control cell-cycle arrest, DNA repair, and apoptosis via downstream gene activation.

Conclusions:

  • The p53 gene network is a complex system vital for cellular integrity.
  • Understanding p53 interactions is crucial for comprehending its tumor-suppressive functions.
  • Further elucidation of this network may reveal new therapeutic targets for cancer treatment.