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c-Myc es un amplificador universal de genes expresados en linfocitos y células madre embrionarias
Zuqin Nie1, Gangqing Hu, Gang Wei
1Laboratory of Pathology, NCI, Bethesda, MD 20892, USA.
Cell
|October 2, 2012
Resumen
La proteína c-Myc amplifica la expresión génica, no simplemente enciende o apaga los genes. Este hallazgo ofrece un principio unificador para la comprensión de c-Myc.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Biología celular Biología celular.
Sus antecedentes:
- La proteína c-Myc (Myc), un factor de transcripción, juega un papel crucial en el crecimiento celular, la proliferación y la apoptosis.
- Comprender los mecanismos reguladores de Myc es vital debido a su participación tanto en los procesos fisiológicos normales como en condiciones patológicas como el cáncer.
- El conocimiento actual carece de un principio unificador para explicar las diversas funciones de Myc, en parte debido a una comprensión incompleta de sus genes diana.
Objetivo del estudio:
- Para aclarar el papel regulador de la proteína c-Myc en la expresión génica.
- Identificar un principio unificador que rige la función de Myc en la regulación génica.
- Para investigar la acción de Myc en un sistema con regulación temporal y fisiológica.
Principales métodos:
- Análisis comparativo de transcriptomas y distribuciones en todo el genoma de las modificaciones de Myc, ARN polimerasa II y cromatina.
- Estudio realizado durante la activación de los linfocitos y en células madre embrionarias (CE).
- Análisis cuantitativo de los patrones de expresión génica.
Principales resultados:
- Myc actúa como un amplificador no lineal de la expresión génica, en lugar de un interruptor de encendido / apagado.
- Myc universalmente se dirige a los genes transcritos activamente.
- Los genes tempranos inmediatos, fuertemente inducidos antes de Myc, son una excepción a esta regla.
Conclusiones:
- Se ha identificado una regla simple y unificadora para la acción de Myc: la amplificación no lineal de la expresión génica en los genes activos.
- Esta regla explica una porción significativa de la biología observada de Myc.
- La investigación adicional puede basarse en este principio para comprender las múltiples funciones de Myc en los procesos celulares.
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