BAP1 regulation of the key adaptor protein NCoR1 is critical for γ-globin gene repression.

BAP1 regulation of the key adaptor protein NCoR1 is critical for γ-globin gene repression.
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DOI:
10.1101/gad.318436.118
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发表时间:
2018-12-01
影响因子:
10.5
通讯作者:
Engel JD
Engel JD
中科院分区:
生物学1区
文献类型:
--
作者:
Yu L;Jearawiriyapaisarn N;Lee MP;Hosoya T;Wu Q;Myers G;Lim KC;Kurita R;Nakamura Y;Vojtek AB;Rual JF;Engel JD

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在这项研究中,Yu 等人。发现核受体辅阻遏物-1 (NCoR1) 是 DRED 阻遏物的关键组成部分,它充当结合 DNA 结合和表观遗传酶成分(例如 DNMT1 和 LSD1)的支架,从而引发 DRED 功能。他们还描述了一种有效的新的 γ-珠蛋白抑制调节剂:去泛素酶 BAP1 是阻遏复合物的一个组成部分,其活性将 NCoR1 维持在 β-珠蛋白位点,并且红系细胞中的 BAP1 抑制大量诱导 γ-珠蛋白合成。人类珠蛋白基因的产生在出生后不久就从胎儿合成转录“转换”为成人合成,并受到大分子复合物的控制,这些大分子复合物通过分散在整个基因座的顺式元件增强或抑制转录。 DRED(直接重复红细胞定性)阻遏蛋白被孤儿核受体 TR2 (NR2C1) 和 TR4 (NR2C2) 招募到 ε-珠蛋白和 γ-珠蛋白启动子,以在成体红细胞中引起它们的沉默。在这里,我们发现核受体辅阻遏物-1 (NCoR1) 是 DRED 的关键组成部分,它充当结合 DNA 结合酶和表观遗传酶成分(例如 DNA 甲基转移酶 1 [DNMT1] 和赖氨酸特异性去甲基酶 1 [LSD1])的支架,从而引发 DRED 功能。我们还描述了一种有效的新型 γ-珠蛋白抑制调节剂:去泛素酶 BRCA1 相关蛋白-1 (BAP1) 是阻遏复合物的一个组成部分,其活性将 NCoR1 维持在 β-珠蛋白位点,并且红系细胞中的 BAP1 抑制可大量诱导 γ-珠蛋白合成。这些数据通过发现介导 γ-珠蛋白基因抑制的新型表观遗传酶,提供了新的机制见解。
In this study, Yu et al. found that nuclear receptor corepressor-1 (NCoR1) is a critical component of the DRED repressor that acts as a scaffold to unite the DNA-binding and epigenetic enzyme components (e.g. DNMT1 and LSD1) that elicit DRED function. They also describe a potent new regulator of γ-globin repression: The deubiquitinase BAP1 is a component of the repressor complex whose activity maintains NCoR1 at sites in the β-globin locus, and BAP1 inhibition in erythroid cells massively induces γ-globin synthesis. Human globin gene production transcriptionally “switches” from fetal to adult synthesis shortly after birth and is controlled by macromolecular complexes that enhance or suppress transcription by cis elements scattered throughout the locus. The DRED (direct repeat erythroid-definitive) repressor is recruited to the ε-globin and γ-globin promoters by the orphan nuclear receptors TR2 (NR2C1) and TR4 (NR2C2) to engender their silencing in adult erythroid cells. Here we found that nuclear receptor corepressor-1 (NCoR1) is a critical component of DRED that acts as a scaffold to unite the DNA-binding and epigenetic enzyme components (e.g., DNA methyltransferase 1 [DNMT1] and lysine-specific demethylase 1 [LSD1]) that elicit DRED function. We also describe a potent new regulator of γ-globin repression: The deubiquitinase BRCA1-associated protein-1 (BAP1) is a component of the repressor complex whose activity maintains NCoR1 at sites in the β-globin locus, and BAP1 inhibition in erythroid cells massively induces γ-globin synthesis. These data provide new mechanistic insights through the discovery of novel epigenetic enzymes that mediate γ-globin gene repression.
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