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El mapeo de todo el transcriptoma revela una extendida pseudouridilación regulada dinámicamente de ncRNA y mRNA
Schraga Schwartz1, Douglas A Bernstein2, Maxwell R Mumbach1
1Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
Cell
|September 16, 2014
Resumen
Los investigadores desarrollaron Ψ-seq para mapear la pseudouridina a través del transcriptoma. Este método identificó cientos de nuevos sitios de modificación y reveló pseudouridina.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- ARN Biología Biología ARN
- Genética La genética.
Sus antecedentes:
- La pseudouridina es la modificación de ARN más abundante, pero sus posiciones y funciones son en gran medida desconocidas.
- La comprensión de la pseudouridina es crucial para varios procesos celulares.
Objetivo del estudio:
- Desarrollar un método de todo el transcriptoma para el mapeo cuantitativo de la pseudouridina.
- Para identificar nuevos sitios de pseudouridina y sus enzimas modificadoras.
- Investigar las funciones funcionales de la pseudouridina en la estabilidad del ARNm y en las enfermedades.
Principales métodos:
- Desarrollo y validación de Ψ-seq para el mapeo de pseudouridinas.
- Perturbación de las sintasas de pseudouridina (PUS) para determinar la modificación específica del sitio.
- Análisis de los niveles de pseudouridina en levaduras sometidas a choque térmico y en células de pacientes con disqueratosis congénita.
Principales resultados:
- Ψ-seq mapeó con éxito la pseudouridina a través del transcriptoma, identificando cientos de nuevos sitios en el ARNm y el ARNn humano y de levadura.
- Se identificaron sintasas específicas de pseudouridina y sus características de secuencia objetivo.
- La pseudouridilación mediada por Pus7p fue inducida por el choque térmico en la levadura, mejorando la estabilidad del ARNm.
- Se observó una reducción de la pseudouridina de ARNr en las células de pacientes con disqueratosis congénita con mutaciones DKC1.
Conclusiones:
- Ψ-seq proporciona una vista mejorada de todo el transcriptoma de la pseudouridina.
- Este estudio aclara los mecanismos de modificación de la pseudouridina y su importancia funcional.
- La pseudouridina juega un papel en la estabilidad del ARN y está implicada en enfermedades humanas como la disqueratogénesis congénita.
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