Related Experiment Video
Updated: May 11, 2025
14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
9.5K
Latest News from the "Guardian": p53 Directly Activates Asymmetric Stem Cell Division Regulators
1Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas/Universidad Miguel Hernández de Elche, Sant Joan d'Alacant, 03550 Alicant, Spain.
International Journal of Molecular Sciences
|April 17, 2025
Summary
The tumor suppressor TP53 (p53) regulates stem cell division. Our research shows p53 controls asymmetric stem cell division in fruit flies by activating key regulators like Numb and Brat.
Area of Science:
- Cell Biology
- Genetics
- Developmental Biology
Background:
- The TP53 gene, known as the "guardian of the genome," is a crucial tumor suppressor discovered in 1979.
- TP53 mutations are prevalent in human cancers, where p53 traditionally functions to induce cell cycle arrest, DNA repair, or apoptosis under stress.
- Emerging research reveals non-canonical roles for p53 in unstressed cells, including the regulation of stem cell division.
Purpose of the Study:
- To investigate the mechanisms by which p53 modulates its novel functions in stem cell division.
- To explore the role of Drosophila p53 in asymmetric stem cell division (ASCD) within neural stem cells.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Investigated the transcriptional activation of core ASCD regulators by Drosophila p53.
- Examined the function of conserved cell-fate determinants Numb and Brat (human orthologs NUMB and TRIM3/TRIM2/TRIM32).
Main Results:
- Drosophila p53 was found to control ASCD in neural stem cells.
- This control is achieved through the transcriptional activation of ASCD regulators, specifically Numb and Brat.
- Phenotypes in Drosophila p53 mutants related to ASCD were observed to be mild.
Conclusions:
- Drosophila p53 plays a role in regulating asymmetric stem cell division.
- The findings highlight novel non-canonical functions of p53 beyond its traditional tumor suppressor roles.
- Further research is warranted to fully elucidate the mechanisms and implications of p53 in stem cell biology.
Related Concept Videos
01:23Negative Regulator Molecules
35.0K
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.
35.0K
02:37DNA Damage can Stall the Cell Cycle
9.0K
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...
9.0K
02:23Abnormal Proliferation
4.3K
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...
4.3K
01:27Molecular Factors Affecting Cell Division
2.9K
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.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
2.9K
02:34Inhibition of Cdk Activity
4.6K
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...
4.6K
02:39Positive Regulator Molecules
5.2K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
5.2K