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El control coordinado de la replicación y la transcripción por un SAPK protege la integridad genómica
Alba Duch1, Irene Felipe-Abrio, Sonia Barroso
1Cell Signaling Unit, Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona E-08003, Spain.
Nature
|November 27, 2012
Resumen
La proteína quinasa Hog1 activada por el estrés coordina la replicación y transcripción del ADN durante el osmostrés mediante la fosforilación de Mrc1.1. Esto evita la inestabilidad genómica al evitar conflictos entre estos procesos.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- Las células deben manejar los cambios en la expresión génica durante el estrés ambiental.
- La coordinación de la transcripción y la replicación es vital para prevenir el daño del ADN y la recombinación.
- La proteína quinasa activada por el estrés Hog1 (SAPK Hog1) induce genes sensibles al estrés durante la fase S.
Objetivo del estudio:
- Investigar cómo las Saccharomyces cerevisiae coordinan la replicación y transcripción del ADN durante el osmostrés.
- Para aclarar el papel de Hog1 y Mrc1 en la gestión de los procesos celulares bajo estrés.
Principales métodos:
- Investigó la interacción y fosforilación de Mrc1 por Hog1.
- Se analizaron los efectos de la fosforilación de Mrc1 en la replicación, el origen del fuego y la progresión.
- Se utilizaron cepas de Saccharomyces cerevisiae con mutaciones específicas (mrc1(3A)) para evaluar las consecuencias funcionales.
Principales resultados:
- Hog1 fosforila Mrc1 en sitios distintos, independientemente de la vía de daño del ADN (Mec1, Rad53).
- La fosforilación de Mrc1 mediada por Hog1 retrasa el inicio de la replicación y ralentiza la progresión del complejo de replicación.
- Las células con Mrc1 no fosforilable (mrc1(3A)) muestran un aumento de la recombinación asociada a la transcripción y la inestabilidad genómica.
Conclusiones:
- Hog1 y Mrc1 establecen un nuevo punto de control de fase S, separado del punto de control de daño al ADN.
- Esta vía Hog1-Mrc1 permite a las células evitar conflictos entre la replicación del ADN y la transcripción durante el estrés ósmico.
- Los hallazgos destacan un mecanismo crucial para mantener la estabilidad genómica en las células eucariotas.
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