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Un inhibidor de la cinasa dependiente de la ciclina, Dacapo, es necesario para la salida oportuna del ciclo celular
J C de Nooij1, M A Letendre, I K Hariharan
1Massachusetts General Hospital Cancer Center, Charlestown 02129, USA.
Cell
|December 27, 1996
Resumen
Dacapo (dap), un nuevo inhibidor de cdk, es crucial para el desarrollo embrionario al regular la salida del ciclo celular. La sobreexpresión interrumpe los ciclos celulares, mientras que las mutaciones retrasan esta salida, lo que afecta la quiescencia celular.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- El Reglamento del Ciclo Celular.
- Genética molecular La genética molecular.
Sus antecedentes:
- La vía de la Rap1 GTPasa está involucrada en varios procesos celulares.
- Los inhibidores de la cinasa dependiente de la ciclina (cdk) regulan la progresión del ciclo celular.
- Los inhibidores de la CDK de los mamíferos tienen diversas funciones, pero su esencialidad en el desarrollo no se entiende completamente.
Objetivo del estudio:
- Para identificar los genes que interactúan con la Rap1 GTPasa.
- Para caracterizar la función de un nuevo gen de Drosophila, dacapo (dap).
- Para aclarar el papel de dap en el desarrollo embrionario y el control del ciclo celular.
Principales métodos:
- Cribado genético en Drosophila para identificar genes que interactúan.
- Ensayos in vitro para evaluar la actividad inhibidora de dacapo en la ciclina-cdk.dk.
- Estudios de sobreexpresión en el desarrollo ocular de Drosophila.
- Estudios de interacción genética con el homólogo del retinoblastoma (Rbf) y la ciclina E.
- Análisis de los patrones de expresión de dap durante la embriogénesis.
- Examen de la progresión del ciclo celular y la quiescencia en embriones mutantes dap.
Principales resultados:
- Se identificó dacapo (dap) como un gen de Drosophila que interactúa con la Rap1 GTPase.
- Dacapo pertenece a la familia p21/p27 de inhibidores de la CDK.
- Dap es esencial para el desarrollo embrionario normal de Drosophila.
- Dacapo inhibe la actividad de la ciclina-cdk in vitro.
- La sobreexpresión de dap en el desarrollo ocular interrumpe la progresión del ciclo celular y muestra interacciones genéticas con Rbf y ciclina E.
- La expresión Dap se correlaciona con la salida del ciclo celular durante la embriogénesis.
- Los embriones mutantes Dap exhiben una salida retrasada del ciclo celular, lo que lleva a ciclos celulares adicionales y la quiescencia subsiguiente.
Conclusiones:
- Dacapo es un regulador crítico de la salida del ciclo celular durante la embriogénesis de Drosophila.
- Su función es esencial para lograr una salida precisamente programada del ciclo celular.
- Dacapo representa un punto clave de control del desarrollo, distinto de los inhibidores de CDK de mamíferos estudiados anteriormente.
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