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<dc:title xml:lang="fr">Role de DAXX et de CAF-1 dans le ciblage de l'histone H3.3 au chromosome X et aux elements répétés</dc:title>
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<dc:subject xml:lang="fr">Histone variante H3.3</dc:subject>
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<dc:subject xml:lang="en">Histone chaperone DAXX</dc:subject>
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<dcterms:abstract xml:lang="fr">La chaperone d'histones DAXX cible H3.3 à l'hétérochromatine péricentrique et télomérique d'une manière indépendante de la réplication. Le mécanisme qui assure le recrutement de DAXX dans les régions hétérochromatiques est largement inconnu. En utilisant des approches protéomiques et biochimiques, nous montrons qu'en plus du complexe bien connu ATRX/H3/3, DAXX forme un complexe alternatif avec CAF-1, ADNP, HP1 et Trim28. DAXX interagit physiquement avec la partie C-terminal de la sous-unité CAF1-p150 via son domaine N-terminal. Le domaine SIM de DAXX est essentiel à son ciblage aux corps PML et pour le recrutement de CAF-1 au chromosome X et aux éléments répétés. L'inactivation de DAXX entraîne une déplétion importante de CAF-1 des éléments répétés SINEs et LINEs du chromosome X. Nos données révèlent une nouvelle fonction de DAXX et de CAF-1 dans le ciblage de H3.3 au chromosome X.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The histone chaperone DAXX targets H3.3 to pericentric and telomeric heterochromatin in a replication independent manner. The mechanism that ensures appropriate recruitement of DAXX to heterochromatic region is largely unknown. Using proteomic and buochemical approaches, we show that in addition to the well-known ATRX/H3.3 complex, DAXX forms an alternative complex with CAF-1, ADNP, HP1 and trim28. DAXX physically interact with the C-terminus of CAF1-p150 subunit through its N-terminal domain. The DAXX SIM domain was found to be essential for targeting DAXX to PML-NBs, for the recruitment of CAF-1 to heterochromatin. Our genomic date further revealed that DAXX targets CAF-1 to X-chromosome and repetitive elements. Inactivation of DAXX results in major depletion of CAF-1 from X-chromosome SINEs and LINEs. Our data point to a novel function of DAXX and CAF-1 in targeting H3.3 to X-chromosome.</dcterms:abstract>
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