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Transcription Factors02:16

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Histone Modification02:32

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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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Chromatin Structure Regulates pre-mRNA Processing02:41

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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.
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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Updated: May 6, 2026

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Las interacciones de H3K4me3 con TAF3 regulan el ensamblaje del complejo de preiniciación y la activación selectiva

Shannon M Lauberth1, Takahiro Nakayama, Xiaolin Wu

  • 1Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, New York, NY 10065, USA.

Cell
|March 5, 2013
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Resumen

La marca de histona H3K4me3 guía el factor de transcripción TFIID a los genes activos, mejorando la expresión génica impulsada por p53. Este mecanismo asegura una rápida inducción del gen diana p53 durante el estrés genotóxico.

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Área de la Ciencia:

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

Sus antecedentes:

  • Las modificaciones de las histonas controlan los procesos basados en la cromatina, pero sus funciones específicas no se comprenden completamente.
  • La histona H3 trimetilizada en lisina 4 (H3K4me3) está vinculada a los genes activos y ayuda a la transcripción a través de proteínas efectoras como TFIID.

Objetivo del estudio:

  • Aclarar el mecanismo por el cual H3K4me3 influye en la transcripción génica, particularmente en el contexto de los genes diana de p53.
  • Investigar el papel de las interacciones H3K4me3-TAF3 en la dirección del reclutamiento de TFIID y la formación del complejo de preiniciación.

Principales métodos:

  • Interacciones investigadas entre H3K4me3 y TAF3, un componente de TFIID.
  • Se analizó el impacto de H3K4me3 en la transcripción dependiente de p53 y la formación del complejo de preiniciación (PIC).
  • Examinó la interacción entre H3K4me3, TAF3, caja TATA y ensamblaje PIC en la regulación génica.

Principales resultados:

  • Las interacciones H3K4me3-TAF3 son cruciales para el reclutamiento global de TFIID a genes activos, incluidos los objetivos p53.
  • H3K4me3 mejora la transcripción dependiente de p53 promoviendo la formación de PIC, actuando independientemente o con la caja TATA.
  • Las interacciones H3K4me3-TAF3/TFIID modulan las funciones selectivas genéticas de p53 en respuesta al estrés genotóxico.

Conclusiones:

  • H3K4me3 sirve como un regulador clave, dirigiendo el ensamblaje de PIC a través de las interacciones TAF3 / TFIID.
  • Este mecanismo facilita la rápida inducción de genes diana específicos de p53 en caso de estrés genotóxico.
  • El estudio revela una nueva vía para el control epigenético de la transcripción génica y la respuesta celular.