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Live Imaging of Mitosis in the Developing Mouse Embryonic Cortex
Published on: June 4, 2014
La herencia asimétrica del centrosoma mantiene los progenitores neurales en el neocórtex
Xiaoqun Wang1, Jin-Wu Tsai, Janice H Imai
1Developmental Biology Program, Memorial Sloan Kettering Cancer Centre, 1275 York Avenue, New York, New York 10065, USA.
Nature
|October 16, 2009
Resumen
Los progenitores de la glia radial en el neocórtex en desarrollo se dividen asimétricamente. La herencia preferencial de centrosomas más antiguos mantiene estos progenitores, asegurando el desarrollo neocortical adecuado.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología del desarrollo Biología del desarrollo.
- Biología celular Biología celular.
Sus antecedentes:
- La división celular asimétrica en el neocórtex genera tanto progenitores que se renuevan a sí mismos como células diferenciadas.
- Los mecanismos que mantienen comportamientos distintos entre progenitores y progenie no se comprenden completamente.
Objetivo del estudio:
- Investigar el papel de la herencia asimétrica del centrosoma en la regulación del comportamiento del progenitor durante el desarrollo neocortical.
Principales métodos:
- Estudió el neocórtex embrionario de ratón durante el pico de la neurogénesis.
- Se investigó la duplicación y segregación del centrosoma en los progenitores de la glia radial.
- Utilizó la manipulación genética para eliminar la nineína, una proteína específica del centríolo.
Principales resultados:
- Se observó una herencia asimétrica de centrosomas, basada en la edad del centriolo materno.
- Los centrosomas que contienen centriolos de la madre más vieja fueron preferentemente retenidos por los progenitores en la zona ventricular (VZ).
- Los centrosomas más nuevos que contienen centriolos de la madre estaban asociados en su mayoría con células diferenciadas que salían de la VZ.
- La eliminación de nineína interrumpió la segregación asimétrica del centrosoma, lo que condujo al agotamiento prematuro del progenitor.
Conclusiones:
- La herencia asimétrica del centrosoma, específicamente de la madre centríola más antigua, es crucial para mantener los progenitores de la glia radial.
- Este mecanismo asegura la auto-renovación de los progenitores y el correcto desarrollo neocortical.
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