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Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán

2006, Número 4

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Rev Invest Clin 2006; 58 (4)


Grandes alcances de los RNAs pequeños RNA de interferencia y microRNA

Vázquez-Ortiz G, Piña-Sánchez P, Salcedo M

Idioma: Español
Referencias bibliográficas: 139
Paginas: 335-349
Archivo PDF: 160.61 Kb.


RESUMEN

El RNA de doble cadena puede inducir un silenciamiento secuencia-específico en eucarionte. Este proceso de silenciamiento se inicia cuando el RNAdc largo es procesado a RNA pequeño de 21 a 26 nucleótidos mediante la enzima RNAsa III Dicer. Estos RNA pequeños se incorporan a complejos efectores de silenciamiento, que son guiados a secuencias complementarias blanco. Existen diferentes tipos de silenciamiento, cuyas diferencias se basan principalmente en la naturaleza de la secuencia blanco y en la composición proteica de los complejos efectores. La ruta del RNA de interferencia (RNAi) se inicia cuando Dicer genera pequeños RNA de interferencia (siRNA) que se unen por complementariedad al mRNA para su degradación, utilizando el complejo RISC. De manera natural, los siRNA se originan de transposones y virus que producen RNAdc durante su replicación, así como también de otras secuencias repetidas transcritas bidireccionalmente. Algunas de las enzimas que conforman la maquinaria del RNAi como Dicer, entre otras, son codificadas por familias multigénicas en varias especies y también participan en otros mecanismos de silenciamiento mediado por RNA. Los microRNA son otros RNA pequeños que pueden inducir silenciamiento al unirse al mRNA. Éstos se generan de manera general cuando Dicer procesa estructuras de horquilla compuestas de regiones no codificantes, en genomas de plantas y animales. Los miRNA se incorporan a un complejo similar a RISC y, dependiendo de su grado de complementariedad con el mRNA blanco, pueden tener represión traduccional o bien digerir el mRNA. El silenciamiento mediado por miRNA es esencial para el desarrollo de plantas y animales. La inducción artificial del RNAi mediante siRNA o miRNA ha sido adoptada como una herramienta para inactivar la expresión génica, tanto en células en cultivo como en organismos vivos. En esta revisión se muestra el gran progreso en el entendimiento de los mecanismos que participan en la regulación génica mediada por RNA en animales y detalla algunos esfuerzos actuales para encauzar a estos mecanismos como una herramienta en la investigación y como posible terapia en enfermedades.


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