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Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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...
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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...
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...

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Video Experimental Relacionado

Updated: May 30, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
10:28

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers

Published on: September 20, 2018

Un interruptor basado en Polycomb subyacente a la memoria epigenética cuantitativa subyacente.

Andrew Angel1, Jie Song, Caroline Dean

  • 1Department of Computational and Systems Biology, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK.

Nature
|July 26, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Vernalization utiliza el complejo represivo 2 de Polycomb (PRC2) para silenciar de manera estable el gen FLC a través de la trimetilación de la histona 3 lisina 27 (H3K27me3). La duración de la exposición al frío controla cuantitativamente este silenciamiento epigenético, afectando la floración de las plantas.

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Área de la Ciencia:

  • Epigenética y Biología Vegetal.
  • Biología de la cromatina Biología de la cromatina
  • Mecanismos moleculares del silencio genético

Sus antecedentes:

  • El complejo represivo de policombos 2 (PRC2) establece el silenciamiento epigenético a través de H3K27me3.3.
  • La vernalización en Arabidopsis implica el silenciamiento mediado por PRC2 del represor floral FLC.
  • La estabilidad y la nucleación del silenciamiento mediado por PRC2 siguen siendo preguntas clave de investigación.

Objetivo del estudio:

  • Investigar la naturaleza cuantitativa del silenciamiento epigenético inducido por la vernalización del FLC.
  • Para aclarar el mecanismo de la nucleación de PRC2 y la estabilidad en el locus FLC.
  • Para entender cómo la duración de la exposición al frío influye en la memoria epigenética estable.

Principales métodos:

  • Modelado matemático de la dinámica epigenética.
  • Inmunoprecipitación de la cromatina (ChIP) para cuantificar los niveles de H3K27me3.
  • Un análisis de reportero FLC:GUS para evaluar los patrones de expresión génica en células individuales.

Principales resultados:

  • La duración de la exposición al frío dicta cuantitativamente el número de celdas con silenciamiento FLC H3K27me3-mediado estable.
  • Los niveles de H3K27me3 aumentan progresivamente en una región de nucleación localizada dentro del FLC durante el tratamiento en frío.
  • Se propone un mecanismo de conmutación epigenético bistable en el locus FLC, dependiente de la duración del frío y verificado experimentalmente.

Conclusiones:

  • El aspecto cuantitativo de la vernalización se basa en una subpoblación de células que logran el silenciamiento estable H3K27me3 de FLC.
  • La nucleación localizada de las marcas H3K27me3 impulsa un interruptor bistable en la expresión génica del FLC.
  • Es probable que este mecanismo de reprogramación epigenética a través de la nucleación por modificación de histonas localizadas sea ampliamente aplicable.