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Inducible, Cell Type-Specific Expression in Arabidopsis thaliana Through LhGR-Mediated Trans-Activation
Published on: April 19, 2019
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La vernalización en Arabidopsis thaliana está mediada por la proteína del dedo PHD VIN3
Sibum Sung1, Richard M Amasino
1Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison, Wisconsin 53706, USA.
Nature
|January 9, 2004
Resumen
La vernalización, un proceso que requiere frío prolongado, permite la floración en plantas como la Arabidopsis thaliana al reprimir de manera estable el gen FLC (FLOWERING LOCUS C). Un gen recientemente identificado mide la duración del frío y establece este estado vernalizado crucial a través de modificaciones histónicas.
Área de la Ciencia:
- Biología vegetal Biología vegetal
- Genética molecular genética molecular.
- La epigenética es la epigenética.
Sus antecedentes:
- La floración en bienales y anuales de invierno se inhibe en la primera temporada de crecimiento.
- La vernalización, la exposición al frío prolongado del invierno, es esencial para superar este bloqueo de floración.
- En Arabidopsis thaliana, el gen FLOWERING LOCUS C (FLC) actúa como un represor de la floración, con una alta expresión que impide la floración de la primera temporada.
Objetivo del estudio:
- Para identificar genes involucrados en la medición de la duración del frío para la vernalización.
- Comprender los mecanismos moleculares que establecen el estado vernalizado.
- Para dilucidar cómo la vernalización conduce a la represión estable del gen FLC.
Principales métodos:
- Las pantallas genéticas en Arabidopsis thaliana para identificar mutantes con respuestas de vernalización alteradas.
- Análisis molecular de la expresión génica, centrado en el FLC.
- Inmunoprecipitación de cromatina (ChIP) para estudiar las modificaciones de histona en el locus FLC.
Principales resultados:
- Identificación de un nuevo gen crucial para detectar la duración del frío e iniciar la vernalización.
- Demostración de que la vernalización induce una represión mitóticamente estable del FLC.
- La evidencia de que el silenciamiento del gen FLC durante la vernalización implica cambios específicos en las modificaciones de la histona.
Conclusiones:
- Un gen recientemente identificado juega un papel clave en la percepción de la planta de la duración del frío invernal.
- La vernalización establece un estado epigenético heredable en el locus FLC, asegurando una represión estable.
- Las modificaciones de las histonas son eventos moleculares críticos que median el silenciamiento inducido por la vernalización del FLC.
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