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Más allá de la estructura secundaria: los determinantes de la secuencia primaria licencian las horquillas de
Vincent C Auyeung1, Igor Ulitsky, Sean E McGeary
1Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA.
Cell
|February 19, 2013
Resumen
Los científicos identificaron elementos clave de secuencia en los microARN primarios (pri-miRNA) necesarios para su procesamiento. Estos determinantes permiten a las células humanas distinguir los pri-miRNA funcionales de otros ARN de horquilla, asegurando la producción adecuada de microARN.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- ARN Biología Biología ARN
Sus antecedentes:
- Los microARN (miRNA) son reguladores cruciales de la expresión génica, mediando la degradación del mRNA o la represión traslacional.
- El procesamiento celular de las transcripciones primarias de miRNA (pri-miRNAs) en miRNAs maduros es esencial para su función.
- Los pri-miARN forman horquillas de ARN, pero se requieren determinantes de secuencia adicionales para distinguirlos de otras transcripciones que contienen horquilla.
Objetivo del estudio:
- Identificar los determinantes de la secuencia primaria que permiten a las células humanas procesar eficientemente los pri-miRNAs de Caenorhabditis elegans.
- Comprender la base molecular para distinguir entre los pri-miRNA funcionales y los ARN no funcionales.
Principales métodos:
- Generación y cribado funcional de numerosas variantes de pri-miRNAs humanos.
- Secuenciación de alto rendimiento de variantes funcionales de pri-miRNA.
- Análisis comparativo de secuencias de pri-miRNA funcionales y no funcionales para identificar determinantes críticos.
- Validación funcional de determinantes identificados mediante su introducción en C. elegans pri-miRNAs para su procesamiento en células humanas.
Principales resultados:
- La mayoría de los pri-miRNAs de Caenorhabditis elegans carecen de los determinantes de procesamiento necesarios para las células humanas.
- El emparejamiento del tallo dentro de la horquilla de pri-miRNA es esencial para el procesamiento.
- Se identificaron tres determinantes clave de la secuencia primaria, incluido un motivo de unión a SRp20 (CNNC) aguas abajo de la horquilla.
- La adición de estos determinantes a los pri-miRNAs de C. elegans permitió su procesamiento eficiente en las células humanas.
Conclusiones:
- Los determinantes de la secuencia primaria juegan un papel crítico en el procesamiento preciso de los pri-miARN por la maquinaria celular.
- El motivo de unión a SRp20 identificado y otros determinantes se conservan en animales bilaterales y son cruciales para el reconocimiento del miRNA pri.
- Comprender estos determinantes proporciona información sobre la regulación de la biogénesis del miRNA y las diferencias de procesamiento específicas de cada especie.
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