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Intercalación de un nuevo nivel de regulación de la transcripción en un antiguo circuito
Lauren N Booth1, Brian B Tuch, Alexander D Johnson
1Department of Microbiology and Immunology and Department of Biochemistry and Biophysics, University of California, San Francisco, California 94158, USA.
Nature
|December 18, 2010
Resumen
El recableado de la red reguladora de genes creó una novedad evolutiva al agregar una nueva capa de control. Este estudio revela cómo la regulación genética indirecta en Kluyveromyces lactis influye en el comportamiento de apareamiento.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Biología molecular La biología molecular.
- Genética La genética.
Sus antecedentes:
- Las redes reguladoras de genes (GRNs) son cruciales para la novedad evolutiva.
- El recableado de la GRN puede introducir nuevas capas de control transcripcional.
- La comprensión de estos cambios proporciona una visión de los procesos evolutivos.
Objetivo del estudio:
- Para investigar un evento específico de recableado de GRN en levaduras ascomicetas.
- Para entender cómo los cambios en el control de la transcripción impactan el comportamiento celular.
- Para explorar la historia evolutiva de los circuitos de apareamiento en las levaduras.
Principales métodos:
- Genómica comparativa y análisis filogenético.
- Manipulación experimental en las especies Saccharomyces cerevisiae, Kluyveromyces lactis y Candida albicans.
- Análisis de los patrones de expresión génica y las interacciones de proteínas reguladoras.
Principales resultados:
- Se identificó un evento de recableado en el que la regulación genética directa fue reemplazada por un control indirecto a través de Rme1 en K. lactis.
- La lógica ancestral del circuito de apareamiento se conservó, pero produjo un nuevo fenotipo.
- K. lactis integra las señales nutricionales en las decisiones de apareamiento a través de Rme1.
Conclusiones:
- El recableado de GRN, específicamente la intercalación de los niveles regulatorios, es un mecanismo significativo para la innovación evolutiva.
- La evolución de la regulación genética indirecta puede conducir a nuevos comportamientos celulares y adaptación.
- Este estudio proporciona un modelo para comprender cómo los circuitos antiguos se modifican para generar nuevas funciones.
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