A prominent and conserved role for YY1 in Xist transcriptional activation.

A prominent and conserved role for YY1 in Xist transcriptional activation.
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DOI:
10.1038/ncomms5878
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发表时间:
2014-09-11
影响因子:
16.6
通讯作者:
Rougeulle, Claire
Rougeulle, Claire
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Makhlouf, Melanie;Ouimette, Jean-Francois;Oldfield, Andrew;Navarro, Pablo;Neuillet, Damien;Rougeulle, Claire

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在雌性细胞中,非编码RNA Xist在一条X染色体上的积累是真兽目动物X染色体失活的标志。在这里,我们发现了一个普遍存在的常染色体转录因子阴阳1(YY 1)在转录激活Xist在人类和小鼠的基本功能。我们发现,YY 1的缺失阻止了Xist在X失活的启动和维持过程中的上调,并且YY 1直接结合Xist 5′区域以触发Xist启动子的活性。在X染色体失活之前,YY 1与Xist 5′区域的结合与Xist阻遏物REX 1竞争,而在X染色体失活开始时,DNA甲基化控制YY 1与Xist的单等位基因固定。因此,YY 1是第一个参与Xist调控的基本和保守途径的常染色体激活因子,该途径确保X染色体失活的主调节因子的不对称转录上调。
Accumulation of the non-coding RNA Xist on one X chromosome in female cells is a hallmark of X-chromosome inactivation in eutherians. Here, we uncovered an essential function for the ubiquitous autosomal transcription factor Yin-Yang 1 (YY1) in the transcriptional activation of Xist in both human and mouse. We show that loss of YY1 prevents Xist up-regulation during the initiation and maintenance of X-inactivation, and that YY1 binds directly the Xist 5′ region to trigger the activity of the Xist promoter. Binding of YY1 to the Xist 5′ region prior to X-chromosome inactivation competes with the Xist repressor REX1 while DNA methylation controls mono-allelic fixation of YY1 to Xist at the onset of X-chromosome inactivation. YY1 is thus the first autosomal activating factor involved in a fundamental and conserved pathway of Xist regulation that ensures the asymmetric transcriptional up-regulation of the master regulator of X-chromosome inactivation.
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