RNA polymerase II is required for spatial chromatin reorganization following exit from mitosis.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34678064.
- Also identified by DOI 10.1126/sciadv.abg8205 and PMC identifier 8535795.
- Licence recorded as CC BY-NC.
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Abstract
Mammalian chromosomes are three-dimensional entities shaped by converging and opposing forces. Mitotic cell division induces marked chromosome condensation, but following reentry into the G<sub>1</sub> phase of the cell cycle, chromosomes reestablish their interphase organization. Here, we tested the role of RNA polymerase II (RNAPII) in this transition using a cell line that allows its auxin-mediated degradation. In situ Hi-C showed that RNAPII is required for both compartment and loop establishment following mitosis. RNAPs often counteract loop extrusion, and in their absence, longer and more prominent loops arose. Evidence from chromatin binding, super-resolution imaging, and in silico modeling allude to these effects being a result of RNAPII-mediated cohesin loading upon G<sub>1</sub> reentry. Our findings reconcile the role of RNAPII in gene expression with that in chromatin architecture.