Abstract:
:The histone variant H3.3 is enriched at enhancers and active genes, as well as repeat regions such as telomeres and retroelements, in mouse embryonic stem cells (mESCs)1-3. Although recent studies demonstrate a role for H3.3 and its chaperones in establishing heterochromatin at repeat regions4-8, the function of H3.3 in transcription regulation has been less clear9-16. Here, we find that H3.3-specific phosphorylation17-19 stimulates activity of the acetyltransferase p300 in trans, suggesting that H3.3 acts as a nucleosomal cofactor for p300. Depletion of H3.3 from mESCs reduces acetylation on histone H3 at lysine 27 (H3K27ac) at enhancers. Compared with wild-type cells, those lacking H3.3 demonstrate reduced capacity to acetylate enhancers that are activated upon differentiation, along with reduced ability to reprogram cell fate. Our study demonstrates that a single amino acid in a histone variant can integrate signaling information and impact genome regulation globally, which may help to better understand how mutations in these proteins contribute to human cancers20,21.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Martire S,Gogate AA,Whitmill A,Tafessu A,Nguyen J,Teng YC,Tastemel M,Banaszynski LAdoi
10.1038/s41588-019-0428-5subject
Has Abstractpub_date
2019-06-01 00:00:00pages
941-946issue
6eissn
1061-4036issn
1546-1718pii
10.1038/s41588-019-0428-5journal_volume
51pub_type
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