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Virus-induced Gene Silencing (VIGS) in Nicotiana benthamiana and Tomato
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Una estrategia contra-defensiva de los virus de las plantas: supresión del silenciamiento de los genes
1Institute of Biological Chemistry, Washington State University, Pullman 99164-6340, USA.
Cell
|November 25, 1998
Resumen
Los virus de las plantas utilizan proteínas P1/HC-Pro para suprimir el silenciamiento de genes posttranscripcionales (PTGS), un mecanismo clave de defensa de las plantas. Esta estrategia viral aumenta la susceptibilidad al desactivar la respuesta de inactivación del ARN de la planta.
Área de la Ciencia:
- Biología molecular vegetal Biología molecular vegetal
- Virología Virología.
- Regulación genética La regulación genética.
Sus antecedentes:
- El silenciamiento de genes posttranscripcional (PTGS) es un proceso de inactivación de ARN específico de la secuencia en las plantas.
- El PTGS funciona en el citoplasma y está implicado en la defensa contra los virus.
- Los ARN aberrantes o altamente expresados son objetivos de los PTGS.
Objetivo del estudio:
- Para investigar el papel del virus del grabado del tabaco P1/HC-Pro poliproteína en PTGS.
- Para determinar si P1/HC-Pro puede suprimir el PTGS en las plantas.
- Para dilucidar el mecanismo por el cual las proteínas virales interfieren con la defensa de las plantas.
Principales métodos:
- Utilizó un transgén de beta-glucuronidasa (GUS) para establecer un sistema PTGS.
- Empleó cruces genéticos y análisis de segregación para estudiar las interacciones transgénicas.
- Realizó ensayos de transcripción nuclear para evaluar el nivel de supresión del silenciamiento.
Principales resultados:
- Se demostró que un transgén GUS altamente expresado induce efectivamente PTGS.
- Se demostró que el transgén P1/HC-Pro suprime el PTGS de la secuencia GUS.
- Se confirmó que la actividad de supresión silenciosa de P1/HC-Pro operaba a nivel posttranscripcional.
Conclusiones:
- Los virus de las plantas codifican proteínas, como P1/HC-Pro, que suprimen activamente el PTGS.
- La supresión viral de PTGS aumenta la susceptibilidad del huésped al desarmar una vía de defensa crucial.
- Comprender estas estrategias virales es vital para desarrollar una resistencia antiviral efectiva en las plantas.
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