A disproportionate impact of G9a methyltransferase deficiency on the X chromosome.

A disproportionate impact of G9a methyltransferase deficiency on the X chromosome.
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DOI:
10.1101/gad.337592.120
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发表时间:
2021-07-01
影响因子:
10.5
通讯作者:
Lee JT
Lee JT
中科院分区:
生物学1区
文献类型:
--
作者:
Szanto A;Aguilar R;Kesner B;Blum R;Wang D;Cifuentes-Rojas C;Del Rosario BC;Kis-Toth K;Lee JT

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在Szanto等人的这项研究中,作者研究了G9 a在X染色体失活(XCI)中的作用,G9 a是一种负责组蛋白H3在赖氨酸9处二甲基化(H3 K9 me 2)的组蛋白甲基转移酶,在发育调控基因的转录沉默中起关键作用。他们发现了G9 a的女性特异性功能,并证明删除G9 a对X染色体相对于基因组的其余部分具有不成比例的影响,并显示RNA系链G9 a用于H3 K9 me 2修饰的等位基因特异性靶向,并且G9 a-RNA相互作用对XCI至关重要。G9 a是一种组蛋白甲基转移酶,负责组蛋白H3在赖氨酸9处的二甲基化(H3 K9 me 2)。G9 a在发育调控基因的转录沉默中起着关键作用,但其在X染色体失活(XCI)中的作用一直存在争议。在这里,我们揭示了G9 a的女性特异性功能,并证明删除G9 a对X染色体相对于基因组的其余部分具有不成比例的影响。G9 a缺陷导致XCI失败和女性特异性对H3 K9 me 2药物抑制的超敏反应。我们发现G9 a与Tsix和Xist RNA相互作用,并且G9 a-RNA相互作用的竞争性抑制重现了XCI缺陷。在XCI期间,Xist招募G9 a来沉默未来失活X上的X连锁基因。在未来的Xa上,Tsix招募了G9 a来使Xist顺式沉默。因此,用于H3 K9 me 2修饰的等位基因特异性靶向和G9 a-RNA相互作用的RNA系链G9 a对于XCI是必需的。
In this study from Szanto et al., the authors investigated the role of G9a, a histone methyltransferase responsible for the dimethylation of histone H3 at lysine 9 (H3K9me2) that plays key roles in transcriptional silencing of developmentally regulated genes, in X-chromosome inactivation (XCI). They found a female-specific function of G9a and demonstrate that deleting G9a has a disproportionate impact on the X chromosome relative to the rest of the genome, and show RNA tethers G9a for allele-specific targeting of the H3K9me2 modification and the G9a–RNA interaction is essential for XCI. G9a is a histone methyltransferase responsible for the dimethylation of histone H3 at lysine 9 (H3K9me2). G9a plays key roles in transcriptional silencing of developmentally regulated genes, but its role in X-chromosome inactivation (XCI) has been under debate. Here, we uncover a female-specific function of G9a and demonstrate that deleting G9a has a disproportionate impact on the X chromosome relative to the rest of the genome. G9a deficiency causes a failure of XCI and female-specific hypersensitivity to drug inhibition of H3K9me2. We show that G9a interacts with Tsix and Xist RNAs, and that competitive inhibition of the G9a-RNA interaction recapitulates the XCI defect. During XCI, Xist recruits G9a to silence X-linked genes on the future inactive X. In parallel on the future Xa, Tsix recruits G9a to silence Xist in cis. Thus, RNA tethers G9a for allele-specific targeting of the H3K9me2 modification and the G9a-RNA interaction is essential for XCI.
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发表时间: 2017-08-14
期刊: CANCER CELL
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期刊: Science (New York, N.Y.)
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发表时间: 2013-06-01
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发表时间: 1995-10-01
影响因子: 10.5
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