Pax6 controla la identidad de las células progenitoras y el destino neuronal en respuesta a la señalización graduada Shh
Video Experimental Relacionado
Updated: Aug 3, 2026
08:10
Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
Published on: December 14, 2015
J Ericson1, P Rashbass, A Schedl
1Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA.
Cell
|July 11, 1997
Resumen
Los patrones de señalización sonic hedgehog (Shh) distinguen las neuronas motoras y las interneuronas ventrales. La expresión génica de Pax6 y Nkx2.2 en células progenitoras es clave para este desarrollo neuronal mediado por Shh en la médula espinal.
Área de la Ciencia:
- Neurobiología del desarrollo neurobiología del desarrollo.
- La neurociencia molecular es una neurociencia molecular.
- Las redes reguladoras de genes son redes reguladoras de genes.
Sus antecedentes:
- Sonic hedgehog (Shh) es una molécula de señalización crucial en el desarrollo embrionario.
- Los gradientes de Shh modelan el tubo neural ventral, influyendo en las decisiones del destino celular.
- Los factores de transcripción Pax6 y Nkx2.2 son actores clave en el patrón ventral.
Objetivo del estudio:
- Aclarar el papel de la señalización Sonic hedgehog (Shh) en la generación de subtipos neuronales distintos.
- Investigar cómo la señalización Shh establece poblaciones de células progenitoras definidas por la expresión de Pax6 y Nkx2.2.
- Para entender la contribución de Pax6 en la mediación de la señalización graduada de Shh para la identidad neuronal.
Principales métodos:
- Análisis de los patrones de expresión génica (Pax6, Nkx2.2) en progenitores del tubo neural ventral.
- Investigando los efectos de los gradientes de señalización Shh en la determinación del destino neuronal.
- Estudios funcionales sobre el papel de Pax6 en la mediación de las vías de señalización Shh.
Principales resultados:
- La actividad de señalización Shh califica las poblaciones de células progenitoras en el tubo neural ventral.
- Las poblaciones progenitoras distintas, definidas por la expresión de Pax6 y Nkx2.2, son establecidas por Shh.
- Pax6 juega un papel crítico en el establecimiento de dominios de progenitor ventral y la especificación de las identidades de las neuronas motoras y las interneuronas.
Conclusiones:
- La señalización Shh es esencial para la generación gradual de neuronas motoras y interneuronas ventrales.
- Pax6 actúa como un mediador clave de la señalización graduada de Shh, controlando la identidad del progenitor neuronal.
- La interacción entre Shh, Pax6 y Nkx2.2 orquesta el patrón del tubo neural ventral y la diferenciación neuronal.
Videos de Conceptos Relacionados
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
03:14Notch Signaling Pathway
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 until 1985...
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 until 1985...
02:33Hedgehog Signaling Pathway
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...
03:14Notch Signaling Pathway
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 until 1985...
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 until 1985...
01:24Methods of Nuclear Reprogramming
Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.
01:25Inheritance
Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype traits...
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype traits...