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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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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...
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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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Las estructuras SOX2 y SOX11 unidas al nucleosoma aclaran la función del factor pionero

Svetlana O Dodonova1, Fangjie Zhu2, Christian Dienemann1

  • 1Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.

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Los factores de transcripción pioneros como el SOX2 se unen al ADN nucleosómico, distorsionándolo para abrir la cromatina. Esto facilita la expresión génica, crucial para la pluripotencia y la diferenciación de las células madre.

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Área de la Ciencia:

  • Biología molecular
  • La epigenética
  • Biología estructural

Sus antecedentes:

  • Los factores de transcripción pioneros son esenciales para los procesos celulares, incluida la pluripotencia, la diferenciación y la reprogramación.
  • Estos factores pueden acceder y regular los genes dentro de la cromatina muy compacta.
  • SOX2 es un factor pionero clave crítico para la pluripotencia y la auto-renovación de las células madre embrionarias.

Objetivo del estudio:

  • Aclarar los mecanismos estructurales por los cuales los factores de transcripción pioneros SOX2 y SOX11 interactúan con los nucleosomas.
  • Comprender cómo estos factores facilitan la accesibilidad de la cromatina para la regulación génica.

Principales métodos:

  • Se utilizó la microscopía criolectrónica para determinar las estructuras de los dominios de unión al ADN SOX2 y SOX11 unidos a los nucleosomas.
  • El análisis se centró en las interacciones moleculares y los cambios conformacionales inducidos por la unión al factor SOX.

Principales resultados:

  • Los factores SOX se unen al ADN en la ubicación superhélica 2 en el nucleosoma, causando distorsión local del ADN.
  • La unión facilita el desprendimiento de los extremos del ADN del octámero de histona, mejorando la accesibilidad del ADN.
  • La unión SOX puede reposicionar la cola N-terminal de la histona H4, lo que podría interrumpir el apilamiento de nucleosomas de orden superior.

Conclusiones:

  • Los factores de transcripción pioneros utilizan la energía de unión para iniciar la apertura de la cromatina.
  • Este proceso implica la remodelación del nucleosoma y facilita la transcripción genética posterior.
  • Los hallazgos proporcionan información estructural sobre cómo los factores pioneros superan las barreras de la cromatina para regular la expresión génica.