Video Experimental Relacionado
Updated: Mar 1, 2026

11:14
Modeling Paracrine Noncanonical Wnt Signaling In Vitro
Published on: December 10, 2021
2.0K
La cutícula desnuda codifica un antagonista inducible de la señalización Wnt
W Zeng1, K A Wharton, J A Mack
1Department of Developmental Biology, Howard Hughes Medical Institute, Beckman Center, Stanford University School of Medicine, California 94305, USA.
Nature
|February 29, 2000
Resumen
La cutícula desnuda (nkd) actúa como un antagonista de la señal Wnt en el desarrollo de la Drosophila. Este gen es este gen.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- Las respuestas celulares a las señales secretadas son críticas durante el desarrollo animal.
- Los antagonistas inducibles regulan las vías de señalización como Hedgehog, TGF-β, EGF y FGF/Ras.
- La señalización Wnt juega un papel vital tanto en el desarrollo como en el cáncer.
Objetivo del estudio:
- Para investigar el papel de la cutícula desnuda (nkd) del gen de polaridad de segmento de Drosophila.
- Para determinar si nkd funciona como un antagonista para la señal Wnt sin alas (Wg).
- Para aclarar el mecanismo y las implicaciones de nkd en la regulación de la vía Wnt.
Principales métodos:
- Estudió la expresión genética y la función de nkd en embriones de Drosophila y discos imaginales.
- Se analizaron los fenotipos resultantes de la disminución de la función de Nkd y la sobreproducción de Nkd.
- Examinó la mala expresión de Nkd en el vertebrado Xenopus laevis.
- Se realizó un análisis de secuencia de proteínas de Nkd, identificando un motivo de mano EF.
Principales resultados:
- La transcripción de nkd es inducida por la señalización de Wg en Drosophila.
- La pérdida de la función nkd imita el exceso de señalización Wg en los primeros embriones.
- La sobreproducción o la expresión errónea de Nkd en Drosophila y Xenopus conduce a fenotipos que se asemejan a la pérdida de función de Wnt.
- La proteína Nkd comparte similitud con la recoverina, lo que sugiere un vínculo con los flujos iónicos.
Conclusiones:
- La cutícula desnuda (nkd) es un antagonista inducible de la señal Wnt/Wg.
- Nkd regula la potencia, la duración o la distribución de la señal Wnt, potencialmente a través de flujos iónicos.
- Los antagonistas de retroalimentación inducibles por señal como nkd son cruciales para limitar la señalización Wnt en el desarrollo y la enfermedad.
Más Videos Relacionados
Videos de Conceptos Relacionados
Canonical Wnt Signaling Pathway
10.8K
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...
10.8K
Non-Canonical Wnt Signaling Pathways
8.5K
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...
8.5K
Hedgehog Signaling Pathway
10.3K
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
10.3K
Role Of Notch Signalling In Intestinal Stem Cell Renewal
2.5K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
2.5K
Notch Signaling Pathway
6.7K
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
6.7K
Catenins
3.2K
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...
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...
3.2K

