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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.
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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.
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The Nucleosome01:19

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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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The Nucleosome02:33

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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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The Nucleosome Core Particle02:10

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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.
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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.
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Author Spotlight: Efficient Nucleosome Reconstitution for Single-Molecule Techniques
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Decodificación de una sola molécula de nucleosomas modificados combinatoriamente

Efrat Shema1, Daniel Jones2, Noam Shoresh3

  • 1Department of Pathology and Center for Cancer Research, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.

Science (New York, N.Y.)
|May 7, 2016
PubMed
Resumen
Este resumen es generado por máquina.

La nueva imagen de una sola molécula decodifica las modificaciones histónicas en los nucleosomas, revelando estados distintos relacionados con la potencia celular y la regulación epigenética. Esta tecnología avanza en la investigación de la biología de la cromatina.

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Área de la Ciencia:

  • Biología de la cromatina
  • La epigenética
  • Imágenes moleculares

Sus antecedentes:

  • Las combinaciones de modificaciones histónicas regulan la expresión génica, pero son difíciles de estudiar con las tecnologías actuales.
  • Comprender estos estados combinatorios es crucial para descifrar la regulación epigenética y la diferenciación celular.

Objetivo del estudio:

  • Desarrollar y aplicar una tecnología de imagen de una sola molécula de alto rendimiento para decodificar modificaciones combinatorias de histonas en nucleosomas individuales.
  • Investigar cómo estos estados de modificación varían entre las células pluripotentes y comprometidas con el linaje.
  • Evaluar el impacto de las perturbaciones genéticas y químicas en estados específicos de modificación de los nucleosomas.

Principales métodos:

  • Imágenes de una sola molécula de alto rendimiento de nucleosomas.
  • Análisis de millones de nucleosomas individuales de células madre y células diferenciadas.
  • Integración del análisis proteómico con la secuenciación de ADN de una sola molécula.

Principales resultados:

  • Identificación de nucleosomas bivalentes (marcas represivas y activadoras) y otros estados combinatorios.
  • Demostrar que la prevalencia de estos estados se correlaciona con la potencia del desarrollo.
  • Evidencia de que las perturbaciones de la enzima cromatina afectan específicamente a los nucleosomas con estados de modificación definidos.

Conclusiones:

  • La plataforma de imágenes de una sola molécula desarrollada decodifica efectivamente las modificaciones combinatorias de la histona.
  • Esta tecnología proporciona nuevos conocimientos sobre la regulación epigenética y la dinámica de la cromatina durante el desarrollo celular.
  • La plataforma tiene un potencial significativo para abordar cuestiones fundamentales en la biología de la cromatina.