Histone variant H2A.Z deposition and acetylation directs the canonical Notch signaling response.

Histone variant H2A.Z deposition and acetylation directs the canonical Notch signaling response.
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DOI:
10.1093/nar/gky551
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发表时间:
2018-09-19
影响因子:
14.9
通讯作者:
Borggrefe T
Borggrefe T
中科院分区:
生物学2区
文献类型:
--
作者:
Giaimo BD;Ferrante F;Vallejo DM;Hein K;Gutierrez-Perez I;Nist A;Stiewe T;Mittler G;Herold S;Zimmermann T;Bartkuhn M;Schwarz P;Oswald F;Dominguez M;Borggrefe T

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Notch信号转导的一个尚未完全理解的基本特征是从抑制到激活的转录转变,其依赖于由转录因子RBP-J和相关辅因子介导的染色质调节。组蛋白变体的掺入改变了染色质的功能特性,并涉及基因表达的调节。在这里,我们表明组蛋白变体H2A.Z的耗尽导致经典Notch靶基因的上调,并且H2A.Z-伴侣蛋白TRRAP/p400/Tip 60复合物在Notch依赖性增强子处与RBP-J物理缔合。当靶向RBP-J结合的增强子时,乙酰转移酶Tip 60乙酰化H2A.Z并上调Notch靶基因表达。重要的是,Tip 60、p400和H2A.Z的果蝇同源物调节Notch信号传导应答和体内生长。总之,我们的数据表明,需要H2A.Z的负载和乙酰化以确保严格控制典型的Notch活化。
A fundamental as yet incompletely understood feature of Notch signal transduction is a transcriptional shift from repression to activation that depends on chromatin regulation mediated by transcription factor RBP-J and associated cofactors. Incorporation of histone variants alter the functional properties of chromatin and are implicated in the regulation of gene expression. Here, we show that depletion of histone variant H2A.Z leads to upregulation of canonical Notch target genes and that the H2A.Z-chaperone TRRAP/p400/Tip60 complex physically associates with RBP-J at Notch-dependent enhancers. When targeted to RBP-J-bound enhancers, the acetyltransferase Tip60 acetylates H2A.Z and upregulates Notch target gene expression. Importantly, the Drosophila homologs of Tip60, p400 and H2A.Z modulate Notch signaling response and growth in vivo. Together, our data reveal that loading and acetylation of H2A.Z are required to assure tight control of canonical Notch activation.
过乙酰化形式的替换组蛋白H2A.Z是鸡肉中活性基因的特征。
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