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La acetilación dinámica del ARN revelada por el mapeo cuantitativo cruzado evolutivo
Aldema Sas-Chen1, Justin M Thomas2, Donna Matzov3
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.
Nature
|June 20, 2020
Resumen
La N4-acetilcitidina (ac4C) es una modificación del ARN conservado. Nuevos métodos revelan su papel en las arqueas, donde ayuda al crecimiento a altas temperaturas, a diferencia del ARNm humano y de la levadura.
Área de la Ciencia:
- Biología molecular
- Modificaciones del ARN
- La genómica
Sus antecedentes:
- La N4-acetilcitidina (ac4C) es una antigua modificación de ARN que se encuentra en el ARNt y el ARNr.
- Su presencia y función en el ARNm eucariota no se comprenden completamente.
- La dinámica de la acetilación de la citidina requiere más investigación.
Objetivo del estudio:
- Desarrollar un método para el mapeo de todo el transcriptoma de ac4C.
- Investigar la distribución y la función de ac4C en diferentes organismos.
- Para explorar el papel de ac4C en la termoadaptación.
Principales métodos:
- Desarrollo de ac4C-seq, una técnica genómica química.
- Mapeo cuantitativo del ac4C a resolución de un solo nucleótido.
- Perfiles evolutivos cruzados y microscopía cryoelectrónica.
Principales resultados:
- ac4C está ausente en el ARNm humano y de levadura, pero puede ser inducido.
- Las arqueas hipertermófilas exhiben altos niveles de ac4C en varios tipos de ARN.
- Los niveles de ac4C aumentan con la temperatura, y su ausencia causa defectos de crecimiento.
Conclusiones:
- ac4C juega un papel importante en el ARN, particularmente en la termoadaptación en las arqueas.
- El paisaje ac4C está definido cuantitativamente, ofreciendo una base para futuras investigaciones.
- El papel de esta modificación en la biología y las enfermedades requiere más estudios.
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