Related Experiment Video

Updated: Jul 19, 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 family members in myogenic differentiation and rhabdomyosarcoma development

Hakan Cam1, Heidi Griesmann, Michaela Beitzinger

  • 1Molecular Tumor Biology Group, Rudolf-Virchow-Center, DFG Research Center for Experimental Biomedicine, University of Würzburg, 97078 Würzburg, Germany.

Cancer Cell
|October 19, 2006
PubMed

Insights

The p53 family, including p53, p63, and p73, suppresses tumors by controlling cell differentiation. DeltaNp73 disrupts this, promoting rhabdomyosarcoma development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • The p53 protein family, comprising p53, p63, and p73, plays a crucial role in tumor suppression.
  • The precise cooperative mechanisms among these family members in preventing cancer remain incompletely understood.

Purpose of the Study:

  • To elucidate the distinct yet complementary roles of p53 family members in regulating retinoblastoma protein (RB) function during myogenic differentiation.
  • To investigate the impact of DeltaNp73 on differentiation control and its contribution to tumorigenesis.

Main Methods:

  • Analysis of p53 family member functions in regulating RB protein phosphorylation.
  • Investigation of p57 induction by p63 and p73.
  • Assessment of DeltaNp73's role in inhibiting myogenic differentiation and promoting transformation.
  • Evaluation of DeltaNp73 expression in rhabdomyosarcoma and its in vivo tumor progression significance.

Main Results:

  • p53, p63, and p73 exhibit distinct functions in controlling RB activity during myogenic differentiation.
  • p53 activates the retinoblastoma gene, while p63 and p73 induce p57 to maintain RB in an active state.
  • DeltaNp73 inhibits these differentiation-promoting functions, blocks myogenic differentiation, and facilitates oncogene-driven myoblast transformation.
  • DeltaNp73 overexpression is common in rhabdomyosarcoma and critical for tumor progression.

Conclusions:

  • Differentiation control is identified as a fundamental tumor suppressor mechanism employed by the p53 family.
  • DeltaNp73 acts as a key inhibitor of p53 family tumor suppressor functions, driving rhabdomyosarcoma development.

More Related Videos

Tumorsphere Derivation and Treatment from Primary Tumor Cells Isolated from Mouse Rhabdomyosarcomas09:21

Tumorsphere Derivation and Treatment from Primary Tumor Cells Isolated from Mouse Rhabdomyosarcomas

Published on: September 13, 2019

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...
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...
Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...