Video Experimental Relacionado
Updated: May 5, 2026

00:08
A Rapid In Vivo Bioassay for Developmentally Active Enhancers
1.1K
La bivalencia genética en los dominios Polycomb regula la identidad posicional de la cresta neural craneal
Maryline Minoux1,2, Sjoerd Holwerda1, Antonio Vitobello1
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, 4051 Basel, Switzerland.
Resumen
Células de la cresta neural craneal
Área de la Ciencia:
- Biología del desarrollo
- La epigenética
- La genómica
Sus antecedentes:
- Las células de la cresta neural craneal son esenciales para el desarrollo craneofacial.
- Comprender su regulación epigenética es clave para descifrar la morfogénesis facial.
Objetivo del estudio:
- Para investigar los paisajes de cromatina de las subpoblaciones de la cresta neural craneal del ratón.
- Para aclarar el papel de las marcas epigenéticas en la identidad celular de la cresta neural craneal.
Principales métodos:
- Análisis de la accesibilidad de la cromatina in vivo.
- Secuenciación de la inmunoprecipitación de la cromatina (ChIP-seq) para H3K27me3 y H3K4me2.
- Perfiles de transcripción de las subpoblaciones celulares.
Principales resultados:
- Las subpoblaciones de cresta neural craneal postmigración mostraron una accesibilidad similar a la cromatina, pero diferían transcripcionalmente.
- Se encontraron marcas de cromatina bivalentes (H3K27me3 / H3K4me2) en genes silenciados diferencialmente dentro de los dominios de Polycomb.
- Estas regiones bivalentes se establecieron temprano en los progenitores premigratorios.
Conclusiones:
- Los dominios Polycomb bivalentes actúan como una plantilla de cromatina para regular la identidad posicional de las células de la cresta neural craneal.
- Los mecanismos epigenéticos, particularmente las proteínas del grupo Polycomb, son cruciales para la morfogénesis facial.
Videos de Conceptos Relacionados
Pleiotropy
31.2K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
31.2K
Epigenetic Regulation
28.7K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
28.7K
Position-effect Variegation
5.6K
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.
5.6K
Chromatin Position Affects Gene Expression
22.5K
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
22.5K
Combinatorial Gene Control
8.6K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
8.6K
Epigenetic Regulation
3.5K
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...
3.5K

