Video Experimental Relacionado
Updated: Mar 29, 2026
10:21
Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
Published on: February 21, 2018
10.6K
La competencia de proteínas cambia la función de la COP9 de la auto-renovación a la diferenciación
Lei Pan1, Su Wang2, Tinglin Lu3
11] Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110, USA [2] Chinese Academy of Sciences Key Laboratory of Infection and Immunity, Institute of Biophysics, 15 Da Tun Road, Beijing 100101, China [3].
Nature
|August 15, 2014
Resumen
La diferenciación de las células madre está regulada por la competencia de las proteínas. El factor de diferenciación Bam controla el complejo COP9.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología de las células madre Biología de las células madre
- Mecanismos moleculares de las moléculas.
Sus antecedentes:
- La auto-renovación de las células madre y el equilibrio de diferenciación es crucial para el desarrollo.
- Los factores intrínsecos y las señales de nicho regulan este equilibrio.
- Los mecanismos precisos que controlan este interruptor siguen sin estar claros.
Objetivo del estudio:
- Investigar cómo se controla el equilibrio entre la autorrenovación y la diferenciación en las células madre germinales de Drosophila melanogaster (GSC).
- Para aclarar el papel del complejo COP9 y el factor de diferenciación Bam en este proceso.
Principales métodos:
- Se han utilizado GSCs ováricos de Drosophila melanogaster.
- Empleó análisis genético.
- Mecanismos de competencia de proteínas investigados.
Principales resultados:
- El complejo COP9 es intrínsecamente necesario para la auto-renovación del SGC.
- El factor de diferenciación Bam controla la función del complejo COP9 a través de la competencia de proteínas.
- Bam secuestra Csn4, inactivando la función de auto-renovación del complejo COP9 y promoviendo la diferenciación.
Conclusiones:
- Un nuevo mecanismo basado en la competencia de proteínas regula el interruptor de auto-renovación a diferenciación de las células madre.
- Este mecanismo implica el factor de diferenciación Bam y el complejo COP9.
- La competencia de proteínas puede ser un mecanismo generalizado que controla el destino de las células madre en varios sistemas.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:57Protein Complexes with Interchangeable Parts
3.1K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
3.1K
02:33Combinatorial Gene Control
9.9K
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...
9.9K
02:23Abnormal Proliferation
5.4K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.4K
01:28Forced Transdifferentiation
2.5K
Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial...
Artificial...
2.5K
01:29Somatic to iPS Cell Reprogramming
2.8K
Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
2.8K
01:23Negative Regulator Molecules
38.9K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.9K