Mol CellJClub
P-TEFb regulates nucleosome positioning at promoters.
Molecular Cell · · Journal Article
Guo, Si + more
Abstract ↗AI summary
The abstract is read at the publisher; the summary is JClub's.
Acute SEC depletion or inhibition in mouse embryonic stem cells disrupts promoter-proximal nucleosome positioning and causes cryptic transcription within the early elongation zone.
- Why it matters: Promoter nucleosome phasing correlates with active RNA Pol II, but how SEC-driven pause release preserves that chromatin organization is unclear.
- What they did: The study used acute SEC depletion/inhibition in mESCs and found SEC directly phosphorylates CHD1, boosting CHD1 binding to H3K4me2/3-marked nucleosomes and incorporation into elongation condensates.
- The result: Phosphorylation-deficient CHD1 mutations, including disease-associated variants, reproduce SEC inhibition effects on nucleosome positioning, impair RNA Pol II pause release, and attenuate elongation.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.