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La Neurospora checkpoint kinase 2: un vínculo regulador entre el ciclo circadiano y el ciclo celular
António M Pregueiro1, Qiuyun Liu, Christopher L Baker
1Department of Genetics, Dartmouth Medical School, Hanover, NH 03755, USA.
Science (New York, N.Y.)
|July 1, 2006
Resumen
El gen del reloj de Neurospora período-4 (prd-4), un ortólogo de Chk2, vincula los ritmos circadianos a la respuesta al daño del ADN. PRD-4 regula la salida del reloj mediante la fosforilación de FRQ, influyendo en el ciclo celular y el restablecimiento del reloj.
Área de la Ciencia:
- Biología circadiana Biología circadiana.
- Genética molecular genética molecular.
- Regulación del ciclo celular Regulación del ciclo celular
Sus antecedentes:
- El reloj circadiano regula los ritmos biológicos diarios.
- Comprender cómo los factores externos como el daño del ADN afectan el tiempo circadiano es crucial.
- El papel de genes específicos en la integración de estas vías no se entiende completamente.
Objetivo del estudio:
- Para identificar y caracterizar nuevos genes involucrados en la regulación del reloj circadiano en Neurospora.
- Para investigar la relación funcional entre el reloj circadiano y las vías de respuesta al daño del ADN.
- Para dilucidar el mecanismo molecular por el cual PRD-4 influye en la salida e entrada circadiana.
Principales métodos:
- Cribado genético y clonación posicional para identificar el gen prd-4.
- Ensayos bioquímicos para determinar la interacción de PRD-4 con FRQ y su actividad enzimática.
- Análisis de los patrones de expresión de prd-4 bajo diferentes condiciones.
- Investigando el efecto de los agentes que dañan el ADN en el reloj circadiano en cepas mutantes de tipo salvaje y prd-4.
Principales resultados:
- Se identificó el gen del período-4 (prd-4) y su producto PRD-4 es un ortólogo de la quinasa 2 del punto de control de los mamíferos (Chk2).
- PRD-4 interactúa físicamente con el componente del reloj circadiano FRQ, promoviendo su fosforilación.
- La expresión de prd-4 está regulada por el reloj circadiano.
- Los agentes que dañan el ADN restablecen el reloj circadiano de una manera dependiente de la hora del día, un proceso que requiere PRD-4.
Conclusiones:
- prd-4, el ortólogo de Neurospora Chk2, establece un vínculo molecular entre la salida circadiana y las vías de entrada.
- PRD-4 se alimenta condicionalmente de la salida circadiana para influir en la entrada del reloj y la progresión del ciclo celular.
- Este estudio revela un nuevo mecanismo que integra el cronometraje circadiano con la vigilancia de daños en el ADN.
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