Chromatin remodeler Znhit1 preserves hematopoietic stem cell quiescence by determining the accessibility of distal enhancers.

Chromatin remodeler Znhit1 preserves hematopoietic stem cell quiescence by determining the accessibility of distal enhancers.
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染色质重塑因子 Znhit1 通过确定远端增强子的可及性来保持造血干细胞静止

DOI:
10.1038/s41375-020-0988-5
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发表时间:
2020-12
期刊:
影响因子:
11.4
通讯作者:
Zhao B
Zhao B
中科院分区:
医学1区
文献类型:
--
作者:
Sun S;Jiang N;Jiang Y;He Q;He H;Wang X;Yang L;Li R;Liu F;Lin X;Zhao B

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造血干细胞(HSC)利用其静止特性来对抗终生血细胞供应的耗竭。迄今为止,某些染色质结构和随后的转录谱如何允许HSC静止仍不清楚。在这里,我们显示了一个重要的作用,染色质重塑锌指HIT型含1(Znhit 1)在维持HSC静止。我们发现Znhit 1的缺失导致干细胞库的耗尽和造血功能的损害。Znhit 1在机制上决定了HSC静止基因(包括Pten、Fstl 1和Klf 4)远端增强子处的染色质可及性,以持续转录和随后的PI 3 K-Akt信号抑制。此外,Znhit 1-Pten-PI 3 K-Akt轴还参与控制骨髓扩增和B淋巴细胞特化。因此,我们的研究结果确定了Znhit 1介导的染色质重塑在维持造血稳态的HSC功能中的主导作用。
Hematopoietic stem cell (HSC) utilizes its quiescence feature to combat exhaustion for lifetime blood cell supply. To date, how certain chromatin architecture and subsequent transcription profile permit HSC quiescence remains unclear. Here, we show an essential role of chromatin remodeler zinc finger HIT-type containing 1 (Znhit1) in maintaining HSC quiescence. We find that loss of Znhit1 leads to exhaustion of stem cell pool and impairment of hematopoietic function. Mechanically, Znhit1 determines the chromatin accessibility at distal enhancers of HSC quiescence genes, includingPten,Fstl1, andKlf4, for sustained transcription and consequent PI3K–Akt signaling inhibition. Moreover, Znhit1–Pten–PI3K–Akt axis also participates in controlling myeloid expansion and B-lymphoid specification. Our findings therefore identify a dominant role of Znhit1-mediated chromatin remodeling in preserving HSC function for hematopoietic homeostasis.
DOI: 10.1038/nrm3591
发表时间: 2013-06
期刊: Nature reviews. Molecular cell biology
影响因子: --
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