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La supresión de la vía de silenciamiento del microARN por el VIH-1 durante la replicación del virus
Robinson Triboulet1, Bernard Mari, Yea-Lih Lin
1Laboratoire de Virologie Moléculaire, Institut de Génétique Humaine, Montpellier, France.
Science (New York, N.Y.)
|February 27, 2007
Resumen
Los microARN (miRNA) juegan un papel en el control de la replicación del VIH-1. El virus suprime un grupo específico de miRNA, que es necesario para su propia replicación y latencia.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Virología Virología.
- Regulación genética Reglamento genético.
Sus antecedentes:
- Los microARN (miRNA) son pequeños ARN no codificantes cruciales para la regulación de los genes.
- Los miRNA también actúan como un mecanismo de defensa del huésped contra las infecciones virales.
- El papel de la maquinaria de miRNA en la replicación del virus de la inmunodeficiencia humana tipo 1 (VIH-1) no se entiende completamente.
Objetivo del estudio:
- Para investigar el papel fisiológico de la maquinaria de silenciamiento de miRNA en el control de la replicación del VIH-1.
- Para determinar si el VIH-1 manipula activamente la expresión del miARN.
- Para dilucidar los mecanismos por los cuales el VIH-1 interactúa con las vías de miRNA.
Principales métodos:
- Evaluación del impacto de Dicer y Drosha (enzimas de procesamiento de miRNA) en la replicación del VIH-1 en células infectadas.
- Analizando la expresión del grupo de miRNA miR-17/92 en células infectadas por el VIH-1.
- Investigando el papel del cofactor PCAF de la histona acetiltransferasa Tat en la supresión mediada por el VIH-1 de la expresión del miARN.
Principales resultados:
- Dicer y Drosha inhibieron la replicación del VIH-1 tanto en células donantes infectadas como en células infectadas latentemente.
- El VIH-1 suprimió activamente la expresión del racimo de miRNA miR-17/92.
- Esta supresión fue esencial para una replicación viral eficiente y dependiente de la PCAF.
Conclusiones:
- La vía de silenciamiento del miRNA está fisiológicamente involucrada en la regulación de la replicación del VIH-1.
- El VIH-1 se dirige activamente y suprime grupos específicos de miRNA para su propia propagación.
- Comprender esta interacción podría revelar nuevas dianas terapéuticas para la infección por el VIH-1 y la latencia.
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