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2016 ; 27
(4
): 599-607
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Control of genetic stability by a new heterochromatin compaction pathway
involving the Tip60 histone acetyltransferase
#MMPMID26700317
Grézy A
; Chevillard-Briet M
; Trouche D
; Escaffit F
Mol Biol Cell
2016[Feb]; 27
(4
): 599-607
PMID26700317
show ga
Pericentric heterochromatin is a highly compacted structure required for accurate
chromosome segregation in mitosis. In mammals, it relies on methylation of
histone H3K9 by Suv39H enzymes, which provides a docking site for HP1 proteins,
therefore mediating heterochromatin compaction. Here we show that, when this
normal compaction pathway is defective, the histone acetyltransferase Tip60 is
recruited to pericentric heterochromatin, where it mediates acetylation of
histone H4K12. Furthermore, in such a context, depletion of Tip60 leads to
derepression of satellite transcription, decompaction of pericentric
heterochromatin, and defects in chromosome segregation in mitosis. Finally, we
show that depletion of BRD2, a double bromodomain-containing protein that binds
H4K12ac, phenocopies the Tip60 depletion with respect to heterochromatin
decompaction and defects in chromosome segregation. Taking the results together,
we identify a new compaction pathway of mammalian pericentric heterochromatin
relying on Tip60 that might be dependent on BRD2 recruitment by H4K12
acetylation. We propose that the underexpression of Tip60 observed in many human
tumors can promote genetic instability via defective pericentric heterochromatin.