Ectopically tethered CP190 induces large-scale chromatin decondensation.

Ectopically tethered CP190 induces large-scale chromatin decondensation.
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DOI:
10.1038/srep03917
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发表时间:
2014-01-29
期刊:
影响因子:
4.6
通讯作者:
Renkawitz R
Renkawitz R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ahanger SH;Günther K;Weth O;Bartkuhn M;Bhonde RR;Shouche YS;Renkawitz R

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绝缘子介导的高级染色质和/或核小体组织的改变是表观遗传基因调控的一个重要方面。最近的研究表明,CP 190在这些过程中发挥着关键作用。在这项研究中,我们分析了异位拴系绝缘子因素对染色质结构的影响,发现CP 190在哺乳动物和果蝇细胞中以浓缩的lacO阵列为目标时会诱导大规模的解凝聚。相比之下,单独的dCTCF不能引起这样的解凝聚,然而,当CP 190存在时,dCTCF将其募集到lacO阵列并介导染色质解折叠。CP 190诱导的染色质开放可能与转录激活无关,因为CP 190的结合不会增强报告基因测定中的荧光素酶活性。我们认为,CP 190可能介导组蛋白修饰和染色质重塑活性,通过直接招募或通过DNA结合因子(如dCTCF)靶向诱导开放染色质状态。
Insulator mediated alteration in higher-order chromatin and/or nucleosome organization is an important aspect of epigenetic gene regulation. Recent studies have suggested a key role for CP190 in such processes. In this study, we analysed the effects of ectopically tethered insulator factors on chromatin structure and found that CP190 induces large-scale decondensation when targeted to a condensed lacO array in mammalian and Drosophila cells. In contrast, dCTCF alone, is unable to cause such a decondensation, however, when CP190 is present, dCTCF recruits it to the lacO array and mediates chromatin unfolding. The CP190 induced opening of chromatin may not be correlated with transcriptional activation, as binding of CP190 does not enhance luciferase activity in reporter assays. We propose that CP190 may mediate histone modification and chromatin remodelling activity to induce an open chromatin state by its direct recruitment or targeting by a DNA binding factor such as dCTCF.
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