Abstract:
:Replication and transcription of genomic DNA requires partial disassembly of nucleosomes to allow progression of polymerases. This presents both an opportunity to remodel the underlying chromatin and a danger of losing epigenetic information. Centromeric transcription is required for stable incorporation of the centromere-specific histone dCENP-A in M/G1 phase, which depends on the eviction of previously deposited H3/H3.3-placeholder nucleosomes. Here we demonstrate that the histone chaperone and transcription elongation factor Spt6 spatially and temporarily coincides with centromeric transcription and prevents the loss of old CENP-A nucleosomes in both Drosophila and human cells. Spt6 binds directly to dCENP-A and dCENP-A mutants carrying phosphomimetic residues alleviate this association. Retention of phosphomimetic dCENP-A mutants is reduced relative to wildtype, while non-phosphorylatable dCENP-A retention is increased and accumulates at the centromere. We conclude that Spt6 acts as a conserved CENP-A maintenance factor that ensures long-term stability of epigenetic centromere identity during transcription-mediated chromatin remodeling.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Bobkov GOM,Huang A,van den Berg SJW,Mitra S,Anselm E,Lazou V,Schunter S,Feederle R,Imhof A,Lusser A,Jansen LET,Heun Pdoi
10.1038/s41467-020-16695-7subject
Has Abstractpub_date
2020-06-10 00:00:00pages
2919issue
1issn
2041-1723pii
10.1038/s41467-020-16695-7journal_volume
11pub_type
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