Proteomics

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SS18/BAFs regulate chromatin accessibility dynamics during pluripotent-somatic transition

ABSTRACT: The exit from pluripotency or pluripotent-somatic transition (PST) landmarks an event of mammalian development, and is also a representative cell-fate transition model, but remains largely unresolved. Recently, we reported construction of robust JUN-induced PST completed in one cell cycle and whose dominant regulator SS18/BAFs (Brg1/Brahma-associated factors). However, the transition process in the chromatin architecture and the roles played by BAF are still unknown. Here we report the dynamic changes of chromatin accessibility during JUN-induced PST. Meanwhile, SS18/BAFs mediates PST process by relocating from pluripotent loci to AP-1 associated ones and once compromised, JUN fails to open chromatin and PST will be delayed. Furthermore, we show that the relocation of SS18/BAF partially relays on histone modification H3K27ac, instead of JUN-centric protein-protein interaction. These results reveal the orchestration of master transcription factor, epigenetic machine, and histone modification in the cell fate transition.

ORGANISM(S): Mus Musculus

SUBMITTER: Jing Liu  

PROVIDER: PXD029277 | iProX | Fri Oct 22 00:00:00 BST 2021

REPOSITORIES: iProX

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<h4>Background</h4>The exit from pluripotency or pluripotent-somatic transition (PST) landmarks an event of early mammalian embryonic development, representing a model for cell fate transition.<h4>Results</h4>In this study, using a robust JUN-induced PST within 8 h as a model, we investigate the chromatin accessibility dynamics (CAD) as well as the behaviors of corresponding chromatin remodeling complex SS18/BAFs, to probe the key events at the early stage of PST. Here, we report that, JUN trigg  ...[more]

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