Spt6 prevents transcription-coupled loss of posttranslationally modified histone H3.

Spt6 prevents transcription-coupled loss of posttranslationally modified histone H3.
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DOI:
10.1038/srep02186
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Urano, Takeshi
Urano, Takeshi
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kato, Hiroaki;Okazaki, Kosuke;Iida, Tetsushi;Nakayama, Jun-ichi;Murakami, Yota;Urano, Takeshi

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组蛋白H3的尾部是储存表观遗传信息的理想介质,因为组蛋白H3的位移在转录过程中受到严格限制。为了维持组蛋白H3的位点特异性修饰,需要通过多轮转录将组蛋白分子局部保留在原始位置。在这里,我们发现裂变酵母Spt6是一种高度保守的RNA聚合酶ii与组蛋白H3 - h4相互作用的伴侣,对于维持常染色质和异染色质中组蛋白H3的Lys-4和Lys-9甲基化至关重要。在常染色质中,由于Spt6失活导致Lys-4甲基化组蛋白H3的丢失和新合成的Lys-56乙酰化组蛋白H3的沉积与转录相耦合。而在异染色质中,Spt6与Clr3组蛋白去乙酰化酶平行阻止组蛋白周转和隐转录。我们提出Spt6在转录过程中保留翻译后修饰的组蛋白H3以维持表观基因组的完整性。
The tail of histone H3 is an ideal medium for storing epigenetic information because displacement of histone H3 is heavily restricted during transcription. To maintain the locus-specific modifications of histone H3, histone molecules should be retained locally at the original position through multiple rounds of transcription. Here, we found that fission yeast Spt6, a highly conserved RNA polymerase II-interacting histone H3–H4 chaperone, is essential for the maintenance of Lys-4 and Lys-9 methylation of histone H3 in euchromatin and heterochromatin, respectively. In euchromatin, loss of Lys-4 methylated histone H3 and deposition of newly synthesized Lys-56 acetylated histone H3 induced by Spt6 inactivation were coupled with transcription. While in heterochromatin, Spt6 prevents histone turnover and cryptic transcription in parallel with Clr3 histone deacetylase. We propose that Spt6 retains posttranslationally modified histone H3 during transcription to maintain epigenome integrity.
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