The BAF60 Subunit of the SWI/SNF Chromatin-Remodeling Complex Directly Controls the Formation of a Gene Loop at FLOWERING LOCUS C in Arabidopsis |
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Authors: | Teddy Jégu David Latrasse Marianne Delarue Heribert Hirt Séverine Domenichini Federico Ariel Martin Crespi Catherine Bergounioux Cécile Raynaud Moussa Benhamed |
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Institution: | aInstitut de Biologie des Plantes, Unité Mixte de Recherche 8618 Université Paris-Sud XI, 91405 Orsay, France;bInstitut des Sciences du Végétal, UPR CNRS, F-91190 Gif-sur-Yvette, France;cUnité de Recherche en Génomique Végétale Plant Genomics, INRA/CNRS/University of Evry, F-91057 Evry, France |
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Abstract: | SWI/SNF complexes mediate ATP-dependent chromatin remodeling to regulate gene expression. Many components of these complexes are evolutionarily conserved, and several subunits of Arabidopsis thaliana SWI/SNF complexes are involved in the control of flowering, a process that depends on the floral repressor FLOWERING LOCUS C (FLC). BAF60 is a SWI/SNF subunit, and in this work, we show that BAF60, via a direct targeting of the floral repressor FLC, induces a change at the high-order chromatin level and represses the photoperiod flowering pathway in Arabidopsis. BAF60 accumulates in the nucleus and controls the formation of the FLC gene loop by modulation of histone density, composition, and posttranslational modification. Physiological analysis of BAF60 RNA interference mutant lines allowed us to propose that this chromatin-remodeling protein creates a repressive chromatin configuration at the FLC locus. |
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