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Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo
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Visualización de dominios cromosómicos con el factor asociado al elemento límite BEAF-32
K Zhao1, C M Hart, U K Laemmli
1Department of Biochemistry, University of Geneva, Switzerland.
Cell
|June 16, 1995
Resumen
Los investigadores identificaron BEAF-32, una nueva proteína que se une al elemento límite del scs en Drosophila. Esta proteína es crucial para la organización del dominio cromosómico y la actividad de bloqueo del potenciador, lo que sugiere un papel para la estructura de la cromatina.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Biología de la cromatina Biología de la cromatina
Sus antecedentes:
- El locus hsp70 en Drosophila contiene el elemento límite del scs, una región reguladora crucial para el aislamiento del dominio.
- Comprender los factores que se unen y median la función de los elementos límite es clave para comprender la organización del genoma.
Objetivo del estudio:
- Para identificar y caracterizar las proteínas que se unen al elemento límite del scs.
- Para investigar el papel de estas proteínas en el bloqueo del potenciador y la estructura del dominio cromosómico.
Principales métodos:
- Purificación de las proteínas de Drosophila.
- clonación y secuenciación de ADNc.
- Ensayos de unión in vivo. ensayos de unión in vivo.
- Inmunodescoloración de los cromosomas de politeno.
- Los ensayos de bloqueo de potenciadores.
Principales resultados:
- Se purificaron dos proteínas que se unen al elemento scs'; una fue identificada como BEAF-32 (factor asociado al elemento límite de 32 kDa).
- BEAF-32 se une a las scs' pero no a las scs in vivo.
- El inmunostaining reveló la localización de BEAF-32 a las interbandas y los límites de puff en los cromosomas politenos.
- El sitio de unión palíndromo de BEAF-32 está implicado en la función límite, aunque los ensayos de bloqueo de potenciadores en células transitoriamente transfectadas fueron negativos, lo que sugiere la participación de la cromatina.
Conclusiones:
- BEAF-32 es una nueva proteína que se une al elemento límite del scs y está localizada en las fronteras de interbandas y puff.
- El sitio de unión del scs juega un papel en la función límite, probablemente mediada por BEAF-32.
- Es probable que la cromatina y / o la estructura nuclear estén involucradas en la actividad de bloqueo del potenciador del elemento límite del scs.
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