Video Experimental Relacionado
Updated: Jul 15, 2026
10:28
Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
Control de la transcripción a través de patrones intragénicos de la composición de los nucleosomas
1Department of Biology and the Carolina Center for Genome Sciences, 202 Fordham Hall, CB 3280, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. jlieb@bio.unc.edu
Cell
|December 27, 2005
Resumen
Las modificaciones y variantes de la histona impactan en la iniciación de la transcripción génica. La regulación epigenética en última instancia, controla la accesibilidad del ADN mediante la gestión de la ocupación del nucleosoma.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La epigenética es la epigenética.
- Reglamento genético Reglamento genético.
Sus antecedentes:
- Las modificaciones y variantes de histonas son marcas epigenéticas clave.
- Estas marcas se encuentran en los extremos 5' y 3' de los genes.
- Se sabe que influyen en la iniciación transcripcional.
Objetivo del estudio:
- Explorar el papel de las modificaciones y variantes histónicas en la iniciación transcripcional.
- Investigar la conexión entre los mecanismos epigenéticos y la ocupación del nucleosoma.
- Para entender cómo la ocupación del nucleosoma regula la accesibilidad del ADN.
Principales métodos:
- Revisión de la literatura reciente sobre las modificaciones y variantes de la histona.
- Análisis de estudios que investigan la cinética de la iniciación transcripcional.
- Examen de la investigación sobre los mecanismos epigenéticos y la ocupación de los nucleosomas.
Principales resultados:
- Las diferencias en la modificación de la histona y las variantes de la histona afectan la ubicación y la velocidad de iniciación de la transcripción.
- Es probable que los mecanismos epigenéticos se dirijan a la ocupación del nucleosoma.
- La ocupación regulada de los nucleosomas controla el acceso al ADN.
Conclusiones:
- Las modificaciones y variantes de la histona son reguladores cruciales de la iniciación de la transcripción.
- La ocupación del nucleosoma es un objetivo central para la regulación epigenética.
- El control sobre la accesibilidad del ADN se logra a través de la modulación de la ocupación del nucleosoma.
Videos de Conceptos Relacionados
00:58DNA Packaging
Overview
02:54Nucleosome Remodeling
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
02:35Chromatin Position Affects Gene Expression
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
02:41Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
02:05Duplication of Chromatin Structure
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...