Histone h3 lysine 56 acetylation is linked to the core transcriptional network in human embryonic stem cells.

Histone h3 lysine 56 acetylation is linked to the core transcriptional network in human embryonic stem cells.
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DOI:
10.1016/j.molcel.2009.02.004
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发表时间:
2009-02-27
期刊:
影响因子:
16
通讯作者:
Grunstein, Michael
Grunstein, Michael
中科院分区:
生物学1区
文献类型:
--
作者:
Xie, Wei;Song, Chunying;Young, Nicolas L.;Sperling, Adam S.;Xu, Feng;Sridharan, Rupa;Conway, Anne E.;Garcia, Benjamin A.;Plath, Kathrin;Clark, Amander T.;Grunstein, Michael

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组蛋白 H3 螺旋核心中的赖氨酸 56 乙酰化可打开酵母染色质,促进组蛋白基因转录、DNA 复制、DNA 修复,并防止表观遗传沉默。虽然 K56Ac 在全球酵母和果蝇中含量丰富,但其在哺乳动物中的存在尚不确定。我们在这里使用质谱和全基因组分析表明,K56Ac 存在于人胚胎干细胞 (hESC) 中,在活性和非活性启动子处与多能性 NANOG、SOX2 和 OCT4 的关键调节因子的结合强烈重叠。这还包括典型的组蛋白基因启动子和 hESC 特异性 microRNA 的启动子。然后,K56Ac 在细胞分化时重新定位到发育基因。因此,K56Ac 状态比其他活性组蛋白标记(例如 H3 K4 三甲基化和 K9 乙酰化)更准确地反映了 hESC 和体细胞之间的表观遗传差异。这些结果表明 K56Ac 参与人类多能性核心转录网络。
Lysine 56 acetylation in the helical core of histone H3 opens yeast chromatin and enables histone gene transcription, DNA replication, DNA repair, and prevents epigenetic silencing. While K56Ac is globally abundant in yeast and flies its presence has been uncertain in mammals. We show here using mass spectrometry and genome wide analyses that K56Ac is present in human embryonic stem cells (hESCs) overlapping strongly at active and inactive promoters with the binding of the key regulators of pluripotency NANOG, SOX2 and OCT4. This includes also the canonical histone gene promoters and those for the hESC-specific microRNAs. K56Ac then relocates to developmental genes upon cellular differentiation. Thus K56Ac state more accurately reflects the epigenetic differences between hESCs and somatic cells than other active histone marks such as H3 K4 tri-methylation and K9 acetylation. These results suggest that K56Ac is involved in the human core transcriptional network of pluripotency.
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