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Los potenciadores transcritos conducen ondas de transcripción coordinada en las células de mamíferos en transición
Resumen
La diferenciación celular implica cambios dinámicos en la regulación de los genes. Este estudio revela que la transcripción del potenciador, seguida por el ARN mensajero del factor de transcripción, inicia las primeras respuestas de transcripción durante la diferenciación celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La genómica es la genómica.
- Biología celular Biología celular.
Sus antecedentes:
- La diferenciación celular es un proceso biológico fundamental.
- Se sabe que las redes de transcripción cambian durante la diferenciación.
- La regulación dinámica de los promotores y potenciadores no se ha estudiado exhaustivamente.
Objetivo del estudio:
- Investigar la regulación dinámica de promotores y potenciadores durante la diferenciación celular.
- Identificar los primeros eventos de transcripción en la diferenciación y activación celular.
Principales métodos:
- Medición simultánea de la actividad de promotores y potenciadores utilizando sus salidas transcripcionales.
- Análisis de 19 conjuntos de datos de curso de tiempo de humanos y 14 de ratones en diversos tipos de células y estímulos.
- Identificación de los sitios de unión del factor de transcripción sobrerrepresentados en los elementos reguladores activos.
Principales resultados:
- Los ARN potenciadores (eARN) y posteriormente los ARN mensajeros para los factores de transcripción fueron las primeras respuestas transcripcionales observadas.
- Los promotores y potenciadores activos mostraron una sobrerrepresentación de los sitios de unión para los factores clave de transcripción del linaje.
- Se apoyó un modelo generalizable de ondas transcripcionales secuenciales.
Conclusiones:
- La transcripción del potenciador representa el evento inicial en la cascada de cambios de transcripción durante la diferenciación celular.
- Este hallazgo proporciona un nuevo modelo para comprender la dinámica temporal de la regulación génica en la determinación del destino celular.
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Transcription
160.7K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
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Transcription
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Transcription is the synthesis of RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in correctly synthesizing messenger RNA (mRNA). Transcriptional regulation is responsible for the differentiation of different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds of RNA Molecules
In eukaryotes,...
Transcription Can Produce Different Kinds of RNA Molecules
In eukaryotes,...
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RNA Polymerase II Accessory Proteins
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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Transcription Elongation Factors
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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
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Transcription Elongation Factors
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Transcription Initiation
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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
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