Video Experimental Relacionado
Updated: May 12, 2026
10:09
Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
Published on: January 26, 2018
Papel de Dpy-30 en la especificación de ES cell-fate mediante la regulación de la metilación de H3K4 dentro de
Hao Jiang1, Abhijit Shukla, Xiaoling Wang
1Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, New York, 10065, USA.
Cell
|February 22, 2011
Resumen
La proteína Dpy-30 de los mamíferos regula la trimetilación de la histona H3K4 (H3K4me3) en las células madre embrionarias (CEM). El agotamiento de Dpy-30 perjudica la diferenciación ESC, especialmente el desarrollo del linaje neural, destacando su papel en la regulación génica del desarrollo.
Área de la Ciencia:
- La epigenética es la epigenética.
- Biología de la cromatina Biología de la cromatina
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La metilación de la histona H3K4 (H3K4me) marca los genes activos.
- Las marcas de cromatina bivalentes (H3K4me y H3K27me) caracterizan los genes de desarrollo equilibrados en las células madre embrionarias (CEM).
- La función precisa de la metilación de H3K4 en el mantenimiento y la diferenciación de la ESC sigue sin estar clara.
Objetivo del estudio:
- Para investigar el papel de los mamíferos Dpy-30, una subunidad de los complejos de histona metiltransferasa SET1/MLL, en la metilación de H3K4.
- Determinar la importancia funcional de la metilación de Dpy-30 y H3K4 en la autorrenovación y diferenciación de la ESC.
Principales métodos:
- Modulación in vitro de la metilación de H3K4 por Dpy-30.
- Análisis de todo el genoma de la trimetilación cromosómica H3K4 (H3K4me3) tras el agotamiento de Dpy-30.
- Evaluación del potencial de auto-renovación y diferenciación del CES, particularmente hacia el linaje neural.
Principales resultados:
- Dpy-30 modula la metilación de H3K4 in vitro y regula H3K4me3 en todo el genoma.
- El agotamiento de Dpy-30 no afecta la auto-renovación del ESC, pero perjudica significativamente la diferenciación, especialmente la diferenciación neuronal.
- Los defectos en la inducción génica y en H3K4me3 en los loci de desarrollo acompañan al deterioro de la diferenciación.
Conclusiones:
- Dpy-30 es esencial para regular H3K4me3, un componente clave de las marcas de cromatina bivalente.
- La metilación de H3K4 mediada por complejo SET1/MLL a través de Dpy-30 juega un papel crítico en la regulación génica del desarrollo durante las transiciones de destino ESC.
- Este estudio establece un papel funcional para Dpy-30 en el control del potencial de diferenciación ESC.
Videos de Conceptos Relacionados
01:46Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:23Master Transcription Regulators
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...
01:37Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
01:14Maintenance of the ES Cell State
The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
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...