Video Experimental Relacionado
Updated: Aug 17, 2026

12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
El gen de susceptibilidad del retinoblastoma codifica una fosfoproteína nuclear asociada con la actividad de unión al
1Department of Pathology, University of California San Diego, School of Medicine, La Jolla 92093.
Nature
|October 15, 1987
Resumen
Los investigadores identificaron la proteína RB, un factor clave en el retinoblastoma hereditario. Esta proteína supresora del cáncer está ausente en los tumores, lo que sugiere su papel en la regulación de los genes y la prevención del cáncer.
Área de la Ciencia:
- Biología molecular La biología molecular.
- Genética La genética.
- Investigación de la investigación del cáncer.
Sus antecedentes:
- El retinoblastoma hereditario está relacionado con el gen RB.
- La completa inactivación del gen RB es necesaria para la formación de tumores.
- El gen RB actúa como un supresor del cáncer, oponiéndose a la función oncogénica.
Objetivo del estudio:
- Identificar y caracterizar el producto proteico del gen RB.
- Para investigar la función y localización de la proteína RB.
Principales métodos:
- Técnicas de genética molecular y análisis de secuencias de RB cDNA.
- Preparación de antisera de conejo contra una proteína de fusión trypE-RB.
- Inmunoprecipitación, etiquetado metabólico (ácido 32P-fosfórico), fraccionamiento bioquímico y estudios de inmunofluorescencia.
Principales resultados:
- La proteína RB (110.000-114.000 Mr) fue inmunoprecipitada mediante el uso de antíseros específicos.
- La proteína RB está presente en las líneas celulares normales pero ausente en las líneas celulares del retinoblastoma.
- La proteína RB es una fosfoproteína nuclear con actividad de unión al ADN.
Conclusiones:
- El producto del gen RB es una fosfoproteína nuclear con capacidades de unión al ADN.
- La ausencia de la proteína RB en las células del retinoblastoma sugiere su papel como supresor de tumores.
- La proteína RB probablemente regula otros genes, contribuyendo al control del crecimiento celular.
Videos de Conceptos Relacionados
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.
Regulation of Nuclear Protein Sorting
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
The Retinoblastoma Gene
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.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The Retinoblastoma Gene
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.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...

