Related Experiment Video

Updated: Aug 20, 2025

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

9.6K

Transcription-independent functions of p53 in DNA repair pathway selection

Yu-Hsiu Wang1, Michael P Sheetz1

  • 1Biochemistry and Molecular Biology Department University of Texas Medical Branch, Galveston, TX, 77555, United States.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|November 20, 2022
PubMed

Insights

The tumor suppressor p53 has transcription-independent functions in DNA repair pathway choice and genome stability. Its interaction with PARylation and PI(4,5)P2 is crucial for sensing DNA damage and promoting cell survival.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The tumor suppressor protein p53 plays a critical role in maintaining genome stability.
  • Emerging evidence suggests p53 possesses functions independent of its transcriptional activity.
  • Understanding these novel roles is key to comprehending DNA damage response and cancer suppression.

Purpose of the Study:

  • To elucidate the transcription-independent mechanisms of p53 in DNA damage repair.
  • To investigate the role of PARylation and phosphoinositide lipids in p53's function.
  • To explore the link between p53, genome stability, and longevity.

Main Methods:

  • Investigated p53's interaction with PARylation and PI(4,5)P2 at DNA damage sites.
  • Assessed the recruitment of repair factors and ATR in response to DNA damage.
  • Analyzed correlations between p53 sequence homology, mutation rates, and lifespan across species.

Main Results:

  • PARylation facilitates rapid p53 accumulation at DNA damage sites, aiding repair factor recruitment and tumor suppression.
  • p53 forms complexes with PI(4,5)P2, which is essential for ATR recruitment and DNA repair pathway choice.
  • A correlation exists between p53 homology, mutation rates, and mammalian lifespan.

Conclusions:

  • Transcription-independent p53 functions, involving PARylation and PI(4,5)P2, are vital for directing DNA repair and maintaining genome stability.
  • These findings provide insights into the intricate mechanisms of tumor suppression and longevity.
  • Further research is needed to fully understand the connections between genome stability, cancer, and lifespan.
Keywords:
DNA repair pathway selectionPARylationevolutionary biologylife spanmutation burdenp53synthetic lethality

More Related Videos

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins10:24

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins

Published on: September 28, 2012

14.2K
Visualization of DNA Repair Proteins Interaction by Immunofluorescence07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

10.3K

Related Concept Videos

DNA Damage can Stall the Cell Cycle02:37

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...
9.3K
Long-patch Base Excision Repair01:02

Long-patch Base Excision Repair

Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
7.1K
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...
4.6K
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.7K
Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
31.4K
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.
35.5K