GATA3-dependent cellular reprogramming requires activation-domain dependent recruitment of a chromatin remodeler. Issue 1 (December 2016)

• Record Type: Journal Article
• Authors: Takaku, Motoki; Grimm, Sara; Shimbo, Takashi; Perera, Lalith; Menafra, Roberta; Stunnenberg, Hendrik; Archer, Trevor; Machida, Shinichi; Kurumizaka, Hitoshi; Wade, Paul
• Is Part Of: Genome biology. Volume 17:Issue 1(2016)
• Page Start: 1
• Page End: 16
• Publication Date: 2016-12
• Subjects: GATA3 -- Mesenchymal-to-epithelial transition -- Breast cancer -- Pioneer factor -- Chromatin remodeling -- Enhancer establishment; Genomes -- Periodicals; Biology -- Periodicals; Molecular biology -- Periodicals; 572.8633
• DOI: 10.1186/s13059-016-0897-0
• Languages: English
• ISSNs: 1474-760X

Abstract

Abstract Background Transcription factor-dependent cellular reprogramming is integral to normal development and is central to production of induced pluripotent stem cells. This process typically requires pioneer transcription factors (TFs) to inducede novo formation of enhancers at previously closed chromatin. Mechanistic information on this process is currently sparse. Results Here we explore the mechanistic basis by which GATA3 functions as a pioneer TF in a cellular reprogramming event relevant to breast cancer, the mesenchymal to epithelial transition (MET). In some instances, GATA3 binds previously inaccessible chromatin, characterized by stable, positioned nucleosomes where it induces nucleosome eviction, alters local histone modifications, and remodels local chromatin architecture. At other loci, GATA3 binding induces nucleosome sliding without concomitant generation of accessible chromatin. Deletion of the transactivation domain retains the chromatin binding ability of GATA3 but cripples chromatin reprogramming ability, resulting in failure to induce MET. Conclusions These data provide mechanistic insights into GATA3-mediated chromatin reprogramming during MET, and suggest unexpected complexity to TF pioneering. Successful reprogramming requires stable binding to a nucleosomal site; activation domain-dependent recruitment of co-factors including BRG1, the ATPase subunit of the SWI/SNF chromatin remodeling complex; and appropriate genomic context. The resulting model provides a new conceptual framework forde novo enhancer establishment by a pioneer TF.