La inhibición local y la mejora de largo alcance de la transducción de la señal Dpp por Sog Sog
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1Department of Molecular and Cellular Biology, University of California, Berkeley 94720, USA.
Nature
|April 14, 1999
Resumen
La proteína de gastrulación corta (Sog) y su proteasa tolloide (Tld) son cruciales para los gradientes de señalización decapentaplegia (Dpp) en el desarrollo de Drosophila. Así es Sog Sog Sog.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- La señalización molecular.
- Genética La genética.
Sus antecedentes:
- Los gradientes de señalización extracelular establecen umbrales de actividad génica durante el desarrollo.
- Los gradientes de actividad decapentaplegia (Dpp) modelan el ectodermo dorsal de Drosophila.
- Las proteínas de gastrulación corta (Sog) y tolloides (Tld) son esenciales para la formación del gradiente Dpp.
Objetivo del estudio:
- Investigar el papel paradójico de Sog en la formación de amnioserosa, especificado por la señalización de pico Dpp.
- Para dilucidar el mecanismo por el cual Sog y Tld forman los gradientes de señalización Dpp.
- Para entender cómo Sog influye en la actividad de Dpp en diferentes lugares.
Principales métodos:
- Misión de expresión de SOG utilizando el potenciador de banda 2 saltado en un fondo mutante que expresa DPP.
- Análisis de la distribución de la señalización Dpp en respuesta a Sog. localizado.
- Utilizando una forma atada de Sog para evaluar los requisitos de difusión.
- Comparando los efectos de Sog con el inhibidor heterólogo de Dpp Noggin.
Principales resultados:
- El Sog mal expresado redistribuyó la señalización Dpp, disminuyéndola cerca de la fuente Sog y alcanzando su pico distalmente.
- Tethered Sog suprimió la actividad local de Dpp, pero no la aumentó a distancia, lo que sugiere que la difusión es clave.
- La estimulación de Dpp a larga distancia por Sog requiere Tld, mientras que la inhibición mediada por Sog no lo hace.
- Noggin inhibió la señalización Dpp pero no la aumentó, a diferencia de Sog.
Conclusiones:
- Se requiere la difusión de Sog para mejorar la actividad de Dpp y la formación de amnioserosa.
- Sog y Tld emplean un mecanismo inusual para generar un gradiente de señalización Dpp, especificando la actividad pico lejos de la fuente Sog.
- Esta estrategia permite un control espacial preciso de los patrones de desarrollo.
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