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Los precursores intrónicos de microARN que pasan por alto el procesamiento de Drosha.
J Graham Ruby1, Calvin H Jan, David P Bartel
1Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, Massachusetts 02142, USA.
Nature
|June 26, 2007
Resumen
Los científicos descubrieron una nueva vía de microARN (miRNA) utilizando intrones desbranqueados llamados mirtrones. Estos pasan por alto el procesamiento de Drosha, ofreciendo una ruta alternativa para la biogénesis de miRNA en animales.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- ARN Biología Biología ARN
Sus antecedentes:
- Los microARN (miRNA) son pequeños ARN endógenos que regulan la expresión génica mediante la represión de los ARN mensajeros.
- La biogénesis canónica de miRNA implica el procesamiento de Drosha y Dicer de las horquillas de pre-miRNA.
- Los mecanismos precisos y los orígenes evolutivos de las vías de biogénesis del miRNA son áreas de investigación activa.
Objetivo del estudio:
- Para identificar vías alternativas para la biogénesis de microARN.
- Para investigar el papel de los intrones en la producción de miRNA.
- Para explorar los orígenes evolutivos de los microARN.
Principales métodos:
- Análisis bioinformático para identificar potenciales precursores de miRNA.
- Genómica comparativa para evaluar la conservación evolutiva.
- Caracterización funcional de los mirtrones identificados.
Principales resultados:
- Descubrimiento de los 'mirtrones', intrones desmembrados que imitan a los pre-miRNA.
- Se identificaron 14 mirtrones en Drosophila melanogaster y 4 en Caenorhabditis elegans.
- Evidencia de conservación evolutiva que sugiere funciones reguladoras para los mirtrones.
Conclusiones:
- Existe una nueva vía de biogénesis de miRNA, que utiliza intrones desbranqueados (mirtrones).
- Los Mirtrons pasan por alto el paso de procesamiento canónico dependiente de Drosha.
- Esta vía puede representar un antiguo mecanismo para la evolución del miRNA anterior a Drosha.
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