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Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
Canonical Wnt Signaling Pathway02:54

Canonical Wnt Signaling Pathway

The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
Non-Canonical Wnt Signaling Pathways01:41

Non-Canonical Wnt Signaling Pathways

Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

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Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
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Reconstitution Of β-catenin Degradation In Xenopus Egg Extract

Published on: June 18, 2014

Formación del eje: la beta-catenina atrapa una Wnt.

Jason R Jessen1, Lila Solnica-Krezel

  • 1Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235, USA.

Cell
|March 31, 2005
PubMed
Resumen

Los investigadores identificaron a Wnt11 como un factor de dorsalización crucial para la formación del eje de Xenopus laevis. Este hallazgo enfatiza el papel de los cofactores extracelulares en la dirección de las vías de señalización Wnt canónicas o no canónicas.

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Área de la Ciencia:

  • Biología del desarrollo Biología del desarrollo.
  • Biología Molecular Biología Molecular
  • Genética La genética.

Sus antecedentes:

  • La vía de señalización Wnt es esencial para el desarrollo embrionario.
  • Especificar el eje del cuerpo en los primeros embriones implica complejas cascadas de señalización.
  • Es fundamental identificar los factores clave que inician la formación del eje dorsal.

Objetivo del estudio:

  • Para identificar el factor de dorsalización involucrado en la formación del eje de Xenopus laevis.
  • Para aclarar el papel de Wnt11 en la señalización canónica de Wnt.
  • Comprender cómo los cofactores extracelulares influyen en la activación de la vía Wnt.

Principales métodos:

  • Análisis de la expresión génica en embriones de Xenopus laevis.
  • Ensayos funcionales para determinar el papel de Wnt11.
  • Estudios bioquímicos sobre los componentes de la vía Wnt.

Principales resultados:

  • Wnt11 fue identificado como un componente clave de la vía de señalización canónica de Wnt.
  • Wnt11 actúa como un factor de dorsalización en Xenopus laevis.
  • Los cofactores extracelulares juegan un papel crítico en la determinación de la activación de la vía.

Conclusiones:

  • Wnt11 es un factor fundamental en la especificación del eje embrionario de Xenopus laevis.
  • El estudio destaca la importancia de las señales extracelulares en la regulación de la vía Wnt.
  • Este trabajo avanza en nuestra comprensión de la señalización del desarrollo.