Video Experimental Relacionado
Updated: Dec 30, 2025
06:33
Probing the Roles of Physical Forces in Early Chick Embryonic Morphogenesis
Published on: June 5, 2018
7.6K
Un anillo de tracción impulsa los flujos de tejido para dar forma al embrión de la gastrulación
Mehdi Saadaoui1,2, Didier Rocancourt1,2, Julian Roussel1,2
1Department of Developmental and Stem Cell Biology Institut Pasteur, 75724 Paris, Cedex 15, France.
Science (New York, N.Y.)
|January 25, 2020
Resumen
El desarrollo embrionario depende de las contracciones de actomiosina. Este estudio revela cómo las fuerzas de un anillo límite impulsan la morfogénesis de los tejidos en los embriones de aves, lo que permite la formación de rayas primitivas.
Área de la Ciencia:
- Biología del desarrollo
- Biología celular
- La biofísica
Sus antecedentes:
- La morfogénesis de los tejidos es impulsada por deformaciones celulares impulsadas por redes de actomiosina.
- La transmisión de fuerzas localizadas a través de los tejidos en la escala mesoscópica sigue siendo poco conocida.
Objetivo del estudio:
- Investigar los mecanismos de transmisión de la fuerza durante la morfogénesis tisular.
- Comprender cómo las estructuras supracelulares a gran escala contribuyen al desarrollo embrionario.
Principales métodos:
- Análisis de la gastrulación en embriones aviares enteros.
- Modelado del movimiento del fluido arrastrado por un anillo de tracción.
Principales resultados:
- La gastrulación es impulsada por la contracción gradual de un anillo de actomiosina supracelular en el límite embrionario-extraembrionario.
- La propagación de la fuerza depende de la respuesta similar al fluido del disco embrionario epitelial, influenciada por la división celular.
- Un modelo de movimiento de fluidos captura con precisión los movimientos "polonaise" observados durante la formación de rayas primitivas.
Conclusiones:
- La geometría embrionaria surge de las fuerzas activas generadas en su límite.
- Las redes supracelulares de actomiosina juegan un papel crucial en la transmisión de fuerzas para la formación de tejidos.
- La división celular es esencial para la respuesta fluida del tejido, facilitando la propagación de la fuerza.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:56Gastrulation
65.3K
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
65.3K
01:20Embryonic Connective Tissues
6.2K
During early development, the embryo forms two types of connective tissues— the mesenchyme and mucoid connective tissue.
The mesenchyme is the first connective tissue that emerges in the developing embryo. It consists of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose arrangement allows easy migration of cells, which is essential for germ layer positioning, patterning, and organ morphogenesis during embryonic development.
The mesenchyme is the first connective tissue that emerges in the developing embryo. It consists of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose arrangement allows easy migration of cells, which is essential for germ layer positioning, patterning, and organ morphogenesis during embryonic development.
6.2K
02:15The Contractile Ring
7.1K
Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
7.1K
01:30Neurulation
44.8K
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
44.8K
01:33Cleavage and Blastulation
49.5K
After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
49.5K
01:07Development of Blood Vessels
1.3K
The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
1.3K