The study of SWI/SNF subunits and other transcription factors deposition in asynchronous and mitotic mESCs and cells released from mitosis

We executed CUT&RUN-seq for SWI/SNF components ARID1A, BRD9, SMARCA4, SMARCB1, SMARCE1, as well as ESRRB, SOX2, and EZH2 in asynchronous and mitotic cells and reported that, in asynchronous cells, ARID1A localized primarily at enhancer regions and EZH2 preferentially deposited at bivalent promoters and silent enhancer domains. The remaining factors were enriched at both TSS/promoters and to varying degrees at active enhancers. Unexpectedly, in mitosis, the chromatin regulatory factors almost all tethered at proximal gene regions with very little binding at enhancers. While the SWI/SNF subunits were bound principally at promoters, EZH2, the catalytic subunit of Polycomb Repressive Complex 2 was bound at both promoters and silent enhancers in mitotic cells. Moreover, we reported that upon the degradation of SMARCE1 in mitosis, the occupancy of SOX2, ESRRB, and EZH2 on mitotic chromatin was disrupted. Overall design: Examination of ARID1A, BRD9, SMARCA4, SMARCB1, SMARCE1, as well as ESRRB, SOX2, and EZH2 deposition in asynchronous and mitotic cells. Examination of SOX2, ESRRB, and EZH2 occupancy in mitotically degraded SMARCE1 cells and control cells.