Video Experimental Relacionado
Updated: May 21, 2026
07:08
Detection of Histone Modifications in Plant Leaves
Published on: September 23, 2011
Una histona acetiltransferasa regula la desmetilación del ADN activo en la Arabidopsis
Weiqiang Qian1, Daisuke Miki, Heng Zhang
1Shanghai Center for Plant Stress Biology and Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes of Biological Sciences, Chinese Academy of Sciences, China.
Science (New York, N.Y.)
|June 16, 2012
Resumen
Los investigadores descubrieron IDM1, un regulador clave de la desmetilación del ADN en Arabidopsis. Esta proteína evita la hipermetilación del ADN al crear un entorno de cromatina permisivo para las enzimas de desmetilación del ADN.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología Molecular Biología Molecular
- Ciencias de las plantas Ciencias de las plantas.
Sus antecedentes:
- La desmetilación activa del ADN es crucial para la regulación epigenética en plantas y animales.
- La regulación de la desmetilación activa del ADN y su interacción con las modificaciones de la histona siguen siendo poco conocidas.
Objetivo del estudio:
- Para identificar y caracterizar nuevos reguladores de la desmetilación del ADN en Arabidopsis.
- Para dilucidar el mecanismo por el cual IDM1 influye en la desmetilación del ADN y la estructura de la cromatina.
Principales métodos:
- Análisis genético en Arabidopsis para identificar mutantes.
- Inmunoprecipitación de la cromatina para evaluar las modificaciones de la histona.
- Pruebas de unión al ADN para determinar la interacción de IDM1 con el ADN.
Principales resultados:
- Descubrimiento de IDM1, un regulador esencial para prevenir la hipermetilación del ADN de secuencias repetitivas.
- IDM1 se une al ADN metilado en sitios específicos de la cromatina.
- IDM1 promueve la desmetilación activa del ADN mediante la acetilación de la histona H3, creando un entorno de cromatina favorable para las glicosilasas del ADN.
Conclusiones:
- IDM1 juega un papel crítico en la desmetilación activa del ADN y la regulación epigenética del gen en Arabidopsis.
- El estudio revela un mecanismo que vincula la metilación del ADN, la modificación de la histona y la desmetilación.
- IDM1 actúa como un factor protector contra el silenciamiento de genes en lugares específicos.
Más Videos Relacionados
12:36Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo
Published on: January 14, 2016
11:33Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
Published on: October 14, 2022
Videos de Conceptos Relacionados
02:32Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:32Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25Spreading of Chromatin Modifications
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Writers
The writer is an enzyme that can...
01:32Chromatin Modification in iPS Cells
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
01:01Euchromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
02:04Co-activators and Co-repressors
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...