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Identificación de una vía de orientación del husillo Aurora-A/PinsLINKER/Dlg utilizando la polaridad celular inducida
Christopher A Johnston1, Keiko Hirono, Kenneth E Prehoda
1Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA.
Cell
|September 22, 2009
Resumen
Los investigadores desarrollaron un nuevo método para estudiar la división celular, identificando un dominio proteico clave (Pins) esencial para la orientación precisa del husillo y la diversidad celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología del desarrollo Biología del desarrollo.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La división celular asimétrica genera diversidad celular y mantiene las poblaciones de células madre.
- Los mecanismos de alineación del huso mitótico durante la división celular asimétrica no se comprenden completamente.
- La polaridad cortical es crucial para guiar la orientación del husillo.
Objetivo del estudio:
- Desarrollar un método para inducir la polaridad cortical en células no polarizadas.
- Para caracterizar el papel del Socio de Inscuteable (Pines) en la orientación del husillo.
- Identificar nuevos dominios y mecanismos de regulación de la alineación del husillo dependiente de pines.
Principales métodos:
- Construir polaridad cortical artificial en una línea celular normalmente no polarizada.
- Utilizando un ensayo de polaridad cortical inducida para estudiar la orientación del husillo.
- Investigando la función de los diferentes dominios asociados de Inscuteable (Pins).
Principales resultados:
- Se identificó un dominio de Pins (LINKER) conservado que requiere fosforilación Aurora-A para reclutar discos grandes (Dlg).
- Se ha demostrado que Pins (LINKER) promueve la orientación parcial del husillo.
- Se demostró que el dominio Pins (TPR) requiere Pins (LINKER) para una orientación precisa del husillo dependiente de dynein.
Conclusiones:
- El ensayo de "polaridad cortical inducida" es una herramienta poderosa para estudiar la polaridad celular y la orientación del huso.
- Descubrió un nuevo dominio Pins (Pins(LINKER)) y su mecanismo de regulación que involucra a Aurora-A y Dlg.
- Se aclararon las funciones distintas y cooperativas de los dominios Pins para lograr una orientación precisa del husillo.
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