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<dc:title xml:lang="en">Structural insights into human SWI/SNF chromatin remodeling complexes</dc:title>
<dcterms:alternative xml:lang="fr">Analyses structurales des complexes humains SWI/SNF impliqués dans le remodelage de la chromatine</dcterms:alternative>
<dc:subject xml:lang="fr">Chromatine</dc:subject>
<dc:subject xml:lang="fr">SWI/SNF</dc:subject>
<dc:subject xml:lang="fr">BCL7A</dc:subject>
<dc:subject xml:lang="fr">BAF47</dc:subject>
<dc:subject xml:lang="fr">NcBAF</dc:subject>
<dc:subject xml:lang="fr">Cancer</dc:subject>
<dc:subject xml:lang="en">Chromatin</dc:subject>
<dc:subject xml:lang="en">SWI/SNF</dc:subject>
<dc:subject xml:lang="en">BCL7A</dc:subject>
<dc:subject xml:lang="en">BAF47</dc:subject>
<dc:subject xml:lang="en">NcBAF</dc:subject>
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<dcterms:abstract xml:lang="fr">La chromatine compacte et organise l’ADN génomique dans le noyau eucaryote, les nucléosomes modulant l’accessibilité de l’ADN et influençant l’expression génique et la réparation ADN. Les complexes de remodelage ATP-dépendants SWI/SNF repositionnent ou éjectent les nucléosomes de la fibre chromatinienne et existent chez les mammifères sous trois sous-complexes : cBAF, PBAF et ncBAF. Des mutations dans ces complexes sont retrouvées dans plus de 20 % des cancers humains et sont associées à des maladies neurodégénératives, mais le manque d’informations structurales limite le développement de thérapies anticancéreuses. Nous rapportons ici que BCL7A, sous-unité de mSWI/SNF mutée dans le lymphome diffus à grandes cellules B, se lie au patch acide du nucléosome via un motif d’ancrage, et que la mutation d’au moins une arginine perturbe cette interaction. Cette zone est également occupée par la sous-unité BAF47 dans cBAF et PBAF, mais BAF47 est absente dans ncBAF. Nous avons donc également entrepris des études structurales du complexe ncBAF lié au nucléosome pour élucider son mécanisme de remodelage en l’absence de BAF47 et le rôle de BCL7A dans ce contexte.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Chromatin compacts and organizes genomic DNA within the eukaryotic nucleus, with nucleosomes shaping DNA accessibility and influencing gene expression and DNA repair. ATP-dependent SWI/SNF remodeling complexes reposition or evict nucleosomes on chromatin fiber, and in mammals exist as cBAF, PBAF, and ncBAF. Mutations in these complexes occur in over 20% of human cancers and are linked to neurodegenerative diseases. Despite its potential as a target for anticancer therapies, drug development is limited by a lack of structural information. Here, we report that BCL7A, a mSWI/SNF subunit mutated in diffuse large B-cell lymphoma, binds the nucleosome acidic patch via an arginine anchor motif, and that mutation of at least one arginine disrupts binding. This patch is also contacted by BAF47 subunit in cBAF and PBAF, but BAF47 is absent in ncBAF. So, here, we also initiated structural studies of nucleosome-bound ncBAF complex to investigate its remodeling mechanism in the absence of BAF47 and the role of BCL7A in this context.</dcterms:abstract>
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