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Quantitative Comparison of cis-Regulatory Element (CRE) Activities in Transgenic Drosophila melanogaster
Published on: December 19, 2011
Las regiones de la variante histona His2AvD son requeridas para el desarrollo de Drosophila
M J Clarkson1, J R Wells, F Gibson
1The John Curtin School of Medical Research, The Australian National University, Canberra, Australian Capital Territory.
Nature
|June 29, 1999
Resumen
La variante de histona esencial H2AZ (His2AvD) en Drosophila depende de su dominio C-terminal, no de su pliegue de histona, para sobrevivir. Esta característica única es crucial para su función especializada dentro del núcleo del nucleosoma.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La epigenética es la epigenética.
Sus antecedentes:
- Distintos dominios cromosómicos requieren variantes especializadas de histona para funcionar.
- La histona H2AZ (H2AZ) es esencial para la supervivencia en múltiples especies, incluida la Drosophila melanogaster.
- Comprender las características únicas de Drosophila H2AZ (His2AvD) es clave para su papel esencial.
Objetivo del estudio:
- Para identificar las características estructurales específicas de Drosophila His2AvD responsable de su función esencial.
- Para investigar el papel de los residuos de aminoácidos únicos en el dominio carboxiterminal de His2AvD.
Principales métodos:
- Se realizaron experimentos de intercambio de aminoácidos entre Drosophila His2AvD y H2A.1.1.
- Los genes mutados de His2AvD se introdujeron en Drosophila a través de la transformación.
- Se evaluó la capacidad del His2AvD modificado para rescatar la letalidad de los mutantes nulos.
Principales resultados:
- La función esencial de His2AvD no reside en su pliegue histónico.
- El dominio carboxiterminal de His2AvD contiene la característica única requerida para su función esencial.
- Esta región C-terminal corresponde a una hélice alfa enterrada dentro del núcleo del nucleosoma.
Conclusiones:
- El dominio carboxiterminal de Drosophila H2AZ (His2AvD) es crítico para su función esencial.
- Es probable que los residuos específicos dentro de esta hélice alfa terminal C sean responsables del papel de H2AZ en el establecimiento de dominios cromosómicos especializados.
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