Related Experiment Video

Updated: Aug 17, 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

Complicating the role of p53 in aging

Amanda Gentry1, Sundaresan Venkatachalam

  • 1Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA.

Aging Cell
|June 1, 2005
PubMed

Insights

A p53 mutant mouse model exhibited premature aging and tumor resistance due to a large deletion of 24 genes, including p53. This suggests the tumor suppressor protein alone may not cause these complex phenotypes.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • The p53 tumor suppressor protein is crucial for DNA damage response and frequently mutated in human cancers.
  • A mouse model was created to study a p53 mutation analogous to human cancer hotspots.
  • An aberrant targeting event resulted in a p53 mutant mouse model with a truncated p53 transcript.

Purpose of the Study:

  • To investigate the effects of a truncated p53 allele (m-allele) on observed phenotypes.
  • To re-evaluate the cause of premature aging and tumor resistance in the p53+/m mouse model.
  • To characterize the genetic deletion in the p53+/m mouse model using updated genomic data.

Main Methods:

  • Generation of a p53 targeting vector with a codon 245 mutation.
  • Development of a p53 mutant mouse model (p53+/m) via aberrant ES cell targeting.
  • Genomic analysis to identify deleted genes in the p53+/m mouse model.

Main Results:

  • The p53+/m mouse model displayed phenotypes resembling premature aging and increased resistance to spontaneous tumors.
  • Genetic analysis revealed a deletion of 24 genes, including the p53 gene, in the p53+/m mouse model.
  • The observed phenotypes may be attributed to the deletion of multiple genes, not solely the p53 mutation.

Conclusions:

  • The p53+/m mouse model exhibits complex phenotypes including premature aging and tumor resistance.
  • A significant genetic deletion encompassing 24 genes, including p53, underlies these phenotypes.
  • The p53 tumor suppressor protein is likely not the sole determinant of the observed phenotypes in this model.

More Related Videos

Senescence Detection Using Reflected Light in Adipose Stromal Vascular Fraction10:08

Senescence Detection Using Reflected Light in Adipose Stromal Vascular Fraction

Published on: June 5, 2026

Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence04:56

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

Published on: December 30, 2025

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.
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...
Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...