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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
Published on: May 3, 2014
Terminación del acoplamiento de la transcripción a la maduración del ARN mensajero en levaduras
C E Birse1, L Minvielle-Sebastia, B A Lee
1Sir William Dunn School of Pathology, South Parks Road, University of Oxford, Oxford OX1 3RE, UK.
Science (New York, N.Y.)
|May 2, 1998
Resumen
El procesamiento del 3'-end del ARN mensajero (ARNm) y la terminación de la transcripción están directamente vinculados. Los factores de escisión, no los factores de poliadenilación, son cruciales para acoplar estos procesos para el gen CYC1.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El procesamiento del ARN mensajero (ARNm) es esencial para la expresión génica.
- La terminación de la transcripción es un paso crítico en la regulación génica.
- La interacción entre el procesamiento del extremo 3 del ARNm y la terminación de la transcripción no se entiende completamente.
Objetivo del estudio:
- Investigar la asociación directa entre el procesamiento del extremo 3 del ARNm y la terminación de la transcripción.
- Para determinar las funciones de los factores de procesamiento específicos en este vínculo.
Principales métodos:
- Utilizó el gen CYC1 en Saccharomyces cerevisiae.
- Introducción de mutaciones en los genes que codifican los factores para la escisión del ARNm y la poliadenilación.
- Se evaluó el impacto de estas mutaciones en la terminación de la transcripción.
Principales resultados:
- Las mutaciones en los factores de escisión (RNA14, RNA15, PCF11) interrumpieron la terminación de la transcripción.
- Las mutaciones en los factores de poliadenilación (PAP1, FIP1, YTH1) tuvieron un efecto mínimo en la terminación.
- Se estableció un vínculo directo entre los factores de escisión y la terminación de la transcripción.
Conclusiones:
- Los factores de escisión juegan un papel crítico en el acoplamiento de la terminación de la transcripción con el procesamiento pre-mRNA 3 -end.
- Este vínculo está mediado por factores involucrados en el paso inicial de la escisión.
- La terminación de la transcripción de la ARN polimerasa II está directamente influenciada por la maquinaria de escisión de los extremos 3 del ARNm.
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