Selective translation of epigenetic modifiers drives the developmental clock of neural stem cells

Selective translation of epigenetic modifiers drives the developmental clock of neural stem cells
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表观遗传修饰剂的选择性翻译驱动神经干细胞的发育时钟

DOI:
10.1101/2020.10.08.330852
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发表时间:
2020
期刊:
BioRxiv
影响因子:
--
通讯作者:
Fumio Matsuzaki
Fumio Matsuzaki
中科院分区:
--
文献类型:
--
作者:
Quan Wu;Yuichi Shichino;Takaya Abe;Taeko Suetsugu;Ayaka Omori;Hiroshi Kiyonari;Shintaro Iwasaki;Fumio Matsuzaki

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大脑皮层是由神经干细胞(NSC)连续产生的各种神经元形成的。已经提出了一个时钟机制来支持神经干细胞的时间进展,这主要是由转录组和表观遗传状态定义的。然而,是什么驱动了这样一个发展时钟仍然难以捉摸。我们发现,组蛋白H3三甲基化在Lys27(H3K27me3)修饰的翻译控制是这个时钟的一部分。我们发现,Fbl,一种rRNA甲基转移酶的耗竭,减少了H3K27me3的Ezh2甲基转移酶和Kdm6b脱甲基酶的翻译,并延迟了NSC状态的进展。这些缺陷通过同时抑制H3K27me3甲基转移酶和脱甲基酶来表型化,表明Fbl在全基因组H3K27me3模式中的作用。Fbl通过帽非依赖性机制选择性地增强H3K27me3修饰剂的翻译。因此,我们建议,FBL驱动的内在时钟通过翻译增强的H3K27me3修改器,主要定义的NSC状态。
The cerebral cortex is formed by diverse neurons generated sequentially from neural stem cells (NSCs). A clock mechanism has been suggested to underlie the temporal progression of NSCs, which is mainly defined by the transcriptome and the epigenetic state. However, what drives such a developmental clock remains elusive. We show that translational control of histone H3 trimethylation at Lys27 (H3K27me3) modifiers is part of this clock. We found that depletion of Fbl, an rRNA methyltransferase, reduces translation of both the Ezh2 methyltransferase and Kdm6b demethylase of H3K27me3 and delays progression of the NSC state. These defects are phenocopied by simultaneous inhibition of H3K27me3 methyltransferase and demethylase, indicating the role of Fbl in the genome-wide H3K27me3 pattern. Fbl selectively enhances the translation of H3K27me3 modifiers via a cap-independent mechanism. We thus propose that Fbl drives the intrinsic clock through the translational enhancement of H3K27me3 modifiers that predominantly define the NSC state.
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