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Videos de Conceptos Relacionados

The Nucleosome Core Particle02:10

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
Nucleosome Remodeling02:54

Nucleosome 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...
Inheritance of Chromatin Structures03:17

Inheritance 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...
Duplication of Chromatin Structure02:05

Duplication 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...
Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
The Nucleosome Core Particle01:12

The Nucleosome Core Particle

Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...

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Reconstitution of Nucleosomes with Differentially Isotope-labeled Sister Histones
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Published on: March 26, 2017

Consecuencias epigenéticas de la dinámica de los nucleosomas

Kami Ahmad1, Steven Henikoff

  • 1Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA.

Cell
|November 7, 2002
PubMed
Resumen

El silenciamiento de genes epigenéticos puede ser dinámico, no estático. La movilidad y el reemplazo de los nucleosomas ofrecen un nuevo modelo que explica la regulación genética y enfermedades como el síndrome de Rett.

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Last Updated: May 7, 2026

Reconstitution of Nucleosomes with Differentially Isotope-labeled Sister Histones
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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • La epigenética es la epigenética.
  • Regulación genética Reglamento genético.

Sus antecedentes:

  • Los modelos actuales proponen una relación estática entre las modificaciones histónicas y el silenciamiento de genes.
  • Esta visión estática no explica completamente los fenómenos epigenéticos complejos.

Objetivo del estudio:

  • Proponer un modelo dinámico para el silenciamiento de genes epigenéticos.
  • Explorar el papel de la movilidad y el reemplazo de los nucleosomas en la regulación génica.

Principales métodos:

  • Revisión de la evidencia existente sobre la dinámica de los nucleosomas.
  • Modelado teórico de los mecanismos de silenciamiento epigenético.

Principales resultados:

  • La evidencia apoya la movilidad y el reemplazo de los nucleosomas como factores clave en el silenciamiento de genes.
  • Un modelo dinámico explica mejor fenómenos como la variación y la restricción neuronal en el síndrome de Rett.

Conclusiones:

  • El silenciamiento de genes epigenéticos es probablemente un proceso dinámico que involucra la rotación de nucleosomas.
  • Este modelo dinámico proporciona un marco para la comprensión de diversos fenómenos epigenéticos y trastornos asociados.