Histone H2A.X phosphorylation and Caspase-Initiated Chromatin Condensation in late-stage erythropoiesis.

Histone H2A.X phosphorylation and Caspase-Initiated Chromatin Condensation in late-stage erythropoiesis.
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组蛋白H_2A.X磷酸化和半胱氨酸天冬氨酸氨基转移酶启动的晚期红细胞生成中的染色质缩合。

DOI:
10.1186/s13072-021-00408-5
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发表时间:
2021-07-30
影响因子:
3.9
通讯作者:
Bulger M
Bulger M
中科院分区:
生物学2区
文献类型:
--
作者:
Jeffery NN;Davidson C;Peslak SA;Kingsley PD;Nakamura Y;Palis J;Bulger M

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去核前染色质的凝聚是终末红系成熟的重要组成部分,这一过程中的缺陷与低效的红细胞生成和贫血有关。然而,这一现象涉及的机制还不是很清楚。在这里,我们描述了组蛋白变异体H_2A.X在红细胞生成中的潜在作用。我们在多个模型系统中发现,这种组蛋白对于正常成熟是必不可少的,并且红系细胞中H_2A.X的丢失导致红系特异性基因表达的失调以及核凝集缺陷。此外,我们还证明了红系成熟的特征是在后期红细胞生成过程中,H_2A.X的C-末端的S139和Y142位发生了磷酸化。敲除BAZ1B/WSTF导致Y142磷酸化缺失和核凝聚缺陷,但不能复制在没有H2A.X的情况下观察到的红系特异基因的广泛转录变化。我们将这些发现与Caspase启动的染色质凝聚(CICC)在红系终末成熟中有关,在此过程中,凋亡途径的某些方面被激活,而细胞凋亡被特异性地抑制。网上版载有补充材料,可在10.1186/s13072-021-00408-5查阅。
Condensation of chromatin prior to enucleation is an essential component of terminal erythroid maturation, and defects in this process are associated with inefficient erythropoiesis and anemia. However, the mechanisms involved in this phenomenon are not well understood. Here, we describe a potential role for the histone variant H2A.X in erythropoiesis. We find in multiple model systems that this histone is essential for normal maturation, and that the loss of H2A.X in erythroid cells results in dysregulation in expression of erythroid-specific genes as well as a nuclear condensation defect. In addition, we demonstrate that erythroid maturation is characterized by phosphorylation at both S139 and Y142 on the C-terminal tail of H2A.X during late-stage erythropoiesis. Knockout of the kinase BAZ1B/WSTF results in loss of Y142 phosphorylation and a defect in nuclear condensation, but does not replicate extensive transcriptional changes to erythroid-specific genes observed in the absence of H2A.X. We relate these findings to Caspase-Initiated Chromatin Condensation (CICC) in terminal erythroid maturation, where aspects of the apoptotic pathway are invoked while apoptosis is specifically suppressed. The online version contains supplementary material available at 10.1186/s13072-021-00408-5.
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