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La histona H3.3 chaperona HIRA es esencial para el ensamblaje de la cromatina en el pronúcleo masculino
Benjamin Loppin1, Emilie Bonnefoy, Caroline Anselme
1Centre de Génétique Moléculaire et Cellulaire, U.M.R. 5534, C.N.R.S.-Université Claude Bernard, Lyon-1, 69622 Villeurbanne, France. loppin@cgmc.univ-lyon1.fr
Nature
|October 28, 2005
Resumen
La histona chaperona HIRA es esencial para la descondensación de los espermatozoides y la formación del pronúcleo masculino en Drosophila. Este estudio identifica HIRA como crítico para el ensamblaje de nucleosomas H3.3 en el ADN paterno durante la fertilización.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- La epigenética es la epigenética.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La formación de zigotos requiere la descondensación del núcleo espermático y la sustitución de las protaminas por histonas.
- El sesamo (ssm) mutante de efecto maternal de Drosophila afecta la formación del pronúcleo masculino.
Objetivo del estudio:
- Para identificar el gen responsable de la mutación del sésamo.
- Para aclarar el papel de HIRA en la descondensación del esperma y la formación de pronúcleo masculino.
Principales métodos:
- Análisis genético del mutante de sésamo en Drosophila.
- Análisis de la variante de histona en la cromatina paterna.
Principales resultados:
- La mutación del sésamo es una mutación puntual en el gen Hira.
- HIRA se requiere para el ensamblaje de nucleosomas durante la descondensación del núcleo espermático.
- Los nucleosomas H3.3, no H3, se ensamblan específicamente en la cromatina paterna antes de la replicación del ADN.
Conclusiones:
- HIRA es esencial para la descondensación del esperma y la formación del pronúcleo masculino en Drosophila.
- HIRA media el ensamblaje de los nucleosomas H3.3 en el ADN paterno, estableciendo una distinción epigenética entre los genomas parentales.
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