Video Experimental Relacionado
Updated: Aug 6, 2026
14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Las mutaciones en el gen p53 ocurren en diversos tipos de tumores humanos
J M Nigro1, S J Baker, A C Preisinger
1Johns Hopkins Oncology Center, Baltimore, Maryland 21231.
Nature
|December 7, 1989
Resumen
El gen p53, que inicialmente se pensó que era un oncogén, funciona como supresor de tumores. Las mutaciones en el gen p53 se observan con frecuencia en varios tipos de cáncer humano, a menudo junto con las deleciones del cromosoma 17.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Oncología Oncología.
- Genética La genética.
Sus antecedentes:
- El papel del gen p53 ha evolucionado de oncogénico a supresor de tumores.
- Los genes supresores de tumores a menudo se inactivan tanto por supresión como por mutación.
- Las deleciones alélicas en el cromosoma 17p son comunes en los tumores humanos, incluidos los cánceres colorrectales.
Objetivo del estudio:
- Para investigar la generalidad de las mutaciones del gen p53 en tumores con deleciones alélicas del cromosoma 17p.
- Para determinar si los alelos p53 retenidos contienen mutaciones en tumores con deleciones.
- Para identificar patrones de mutación dentro del gen p53.
Principales métodos:
- Análisis del estado del gen p53 (deleción y mutación alélica) en tumores que presentan deleciones del cromosoma 17p.
- Examen de alelos p53 en tumores con ambos alelos 17p parentales retenidos.
- Identificación de "puntos calientes" de mutación dentro de la secuencia genética p53.
Principales resultados:
- La mayoría de los tumores con deleciones alélicas 17p albergan mutaciones puntuales p53 que conducen a sustituciones de aminoácidos.
- Las mutaciones de p53 ocurren en tumores con y sin deleciones alélicas.
- Las mutaciones de p53 se concentran en cuatro "puntos calientes" específicos que corresponden a regiones de genes conservados.
Conclusiones:
- Las mutaciones del gen p53 están implicadas en la patogénesis de numerosas malignidades humanas comunes.
- La inactivación del gen supresor del tumor p53 a través de la mutación es un evento crítico en el desarrollo del cáncer.
- La comprensión de los patrones de mutación de p53 puede proporcionar información sobre la etiología del cáncer.
Videos de Conceptos Relacionados
02:36DNA 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...
02:23Abnormal 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...
02:21Cancers Originate from Somatic Mutations in a Single Cell
Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
01:12Loss of Tumor Suppressor Gene Functions
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
02:36DNA 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...