Video Experimental Relacionado
Updated: Jun 26, 2026
09:14
Examination of Proteins Bound to Nascent DNA in Mammalian Cells Using BrdU-ChIP-Slot-Western Technique
Published on: January 15, 2016
Colas complicadas: modificaciones histónicas y la respuesta al daño del ADN
Genevieve M Vidanes1, Carla Y Bonilla, David P Toczyski
1Cancer Research Institute, Department of Biochemistry and Biophysics, University of California, San Francisco 94115, USA.
Cell
|July 2, 2005
Resumen
La remodelación de la cromatina y las modificaciones de las histonas son cruciales para las respuestas celulares al daño del ADN. Esta revisión explora el papel de la cromatina en la señalización de la vía del punto de control del daño del ADN después de las rupturas de ADN de doble cadena (DSB).
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Genética La genética.
Sus antecedentes:
- La respuesta celular al daño del ADN implica la identificación, la señalización y la reparación de roturas de ADN de doble cadena (DSB).
- Los remodeladores de cromatina dependientes de ATP y las modificaciones de histonas son actores conocidos en la respuesta DSB.
- Los roles mecánicos exactos de la cromatina en estos procesos aún están bajo investigación.
Objetivo del estudio:
- Revisar y discutir el papel de la cromatina en la señalización de la vía del punto de control del daño del ADN después de los DSB.
- Para dilucidar las contribuciones mecanicistas de las modificaciones de la cromatina a la respuesta al daño del ADN.
Principales métodos:
- Revisión de la literatura y síntesis de la investigación existente sobre la cromatina, el daño del ADN y la señalización de puntos de control.
Principales resultados:
- La modificación de la cromatina es importante, aunque no esencial, para la identificación, activación y reparación del punto de control del DSB.
- Cada vez más se están descubriendo mecanismos específicos basados en la cromatina.
- La cromatina juega un papel importante en la transmisión de señales dentro de la vía del punto de control del daño del ADN.
Conclusiones:
- La dinámica de la cromatina es parte integral de la cascada de señalización del punto de control del daño del ADN.
- Una mayor investigación sobre las funciones precisas de la cromatina mejorará nuestra comprensión de la reparación del ADN y la estabilidad del genoma.
- Comprender la función de la cromatina en la respuesta DSB es clave para comprender los mecanismos de defensa celular.
Videos de Conceptos Relacionados
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25Spreading of Chromatin Modifications
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Writers
The writer is an enzyme that can...
02:04Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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...
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
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...