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El silenciamiento transitorio de la traducción por el ARNm reversible de deadenilación
J Huarte1, A Stutz, M L O'Connell
1Institute of Histology and Embryology, University of Geneva Medical School, Switzerland.
Cell
|June 12, 1992
Resumen
La traducción del ARN mensajero (ARNm) en los ovocitos de ratón está controlada por la longitud de la cola. La dedenilación reversible silencia el ARNm latente, permitiendo la síntesis regulada de proteínas durante la maduración.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Regulación genética Reglamento genético.
Sus antecedentes:
- El ARNm del activador del plasminógeno de tipo tisular (tPA) se almacena sin traducir en los ovocitos primarios del ratón.
- La poliadenilación y la deadenilación regulan la traducción del ARNm durante la maduración de los ovocitos.
- Las colas poli(A) cortas están asociadas con la latencia del ARNm.
Objetivo del estudio:
- Para investigar los mecanismos que controlan la activación traslacional del ARNm tPA.
- Para identificar los elementos de la secuencia que regulan la longitud de la cola.
- Para aclarar el papel de la deadenilación en el control de la traducción de los ARNm latentes.
Principales métodos:
- Análisis de las actividades de poliadenilación y de deadenilación en los ovocitos.
- Identificación de los elementos de control de la adenilación (ACE) en el ARNm.
- Ensayos de traducción del ARNm reportero en ovocitos primarios.
Principales resultados:
- Las transcripciones de ARNm nuclear tPA están extensamente poliadeniladas.
- Los ovocitos poseen una actividad de dedenilación que silencia el ARNm citoplasmático.
- Un elemento de control de adenilación (ACE) rico en AU en el 3' UTR impide la traducción.
- La regulación de la cola poli (A) específica de la etapa controla la síntesis de tPA.
Conclusiones:
- La dedenilación reversible es un mecanismo clave para el control traslacional de los ARNm latentes.
- La regulación de la longitud de la cola poli (A) asegura la síntesis de proteínas específicas de la etapa en los ovocitos.
- Las ACE median el silenciamiento traslacional de los ARNm no traducidos.
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