Syracuse

CHRAC/ACF contribute to the repressive ground state of chromatin

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Scacchetti, Alessandro | Brueckner, Laura | Jain, Dhawal | Schauer, Tamás | Zhang, Xu | Schnorrer, Frank | van Steensel, Bas | Straub, Tobias | Becker, Peter

Edité par CCSD ; Life Science Alliance LLC -

International audience. The chromatin remodeling complexes chromatin accessibility complex and ATP-utilizing chromatin assembly and remodeling factor (ACF) combine the ATPase ISWI with the signature subunit ACF1. These enzymes catalyze well-studied nucleo-some sliding reactions in vitro, but how their actions affect physiological gene expression remains unclear. Here, we explored the influence of Drosophila melanogaster chromatin accessibility complex/ACF on transcription by using complementary gain-and loss-of-function approaches. Targeting ACF1 to multiple reporter genes inserted at many different genomic locations revealed a context-dependent inactivation of poorly transcribed reporters in repressive chromatin. Accordingly , single-embryo transcriptome analysis of an Acf knockout allele showed that only lowly expressed genes are derepressed in the absence of ACF1. Finally, the nucleosome arrays in Acf-deficient chromatin show loss of physiological regularity, particularly in transcriptionally inactive domains. Taken together, our results highlight that ACF1-containing remodeling factors contribute to the establishment of an inactive ground state of the genome through chromatin organization.

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