The primary microRNA-208b interacts with Polycomb-group protein, Ezh2, to regulate gene expression in the heart.

The primary microRNA-208b interacts with Polycomb-group protein, Ezh2, to regulate gene expression in the heart.
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DOI:
10.1093/nar/gkt896
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发表时间:
2014-01
影响因子:
14.9
通讯作者:
El-Osta A
El-Osta A
中科院分区:
生物学2区
文献类型:
--
作者:
Mathiyalagan P;Okabe J;Chang L;Su Y;Du XJ;El-Osta A

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在成人心脏中,由于未知的机制,表观遗传基因沉默需要多梳状蛋白Ezh2。我们研究了Ezh2和非编码RNA在由典型的组蛋白去乙酰酶抑制剂曲古抑素A(TSA)减弱的横动脉缩窄(TAC)所致压力超负荷小鼠模型中的作用。TAC和TAC+TSA心脏的染色质免疫沉淀表明Ezh2和初级microRNA-208B(pri-miR-208B)在调控肥大基因表达方面存在相互作用。Pri-miR-208B和Ezh2的RNAi沉默验证了pri-miR-208B介导的心肌肥厚相关基因的转录沉默,包括抑制心肌肌球蛋白重链基因的双向启动子(BDP)。在TAC小鼠心脏,TSA可减弱Ezh2与BDP的结合,并恢复反义β-MHC和α-MHC基因的表达。TAC心脏的RNA-染色质免疫沉淀实验也表明,Pri-miR-208B依赖的染色质结合增加。这些结果是第一次描述初级miR相互作用整合染色质修饰和对心脏中不同信号提示的转录反应。这些研究为心肌肥厚病理性重构相关基因的MHC表达和调控提供了一个框架。
The Polycomb-group protein, Ezh2, is required for epigenetic gene silencing in the adult heart by unknown mechanism. We investigated the role of Ezh2 and non-coding RNAs in a mouse model of pressure overload using transverse aortic constriction (TAC) attenuated by the prototypical histone deacetylase inhibitor, trichostatin A (TSA). Chromatin immunoprecipitation of TAC and TAC+TSA hearts suggests interaction of Ezh2 and primary microRNA-208b (pri-miR-208b) in the regulation of hypertrophic gene expression. RNAi silencing of pri-miR-208b and Ezh2 validate pri-miR-208b-mediated transcriptional silencing of genes implicated in cardiac hypertrophy including the suppression of the bi-directional promoter (bdP) of the cardiac myosin heavy chain genes. In TAC mouse heart, TSA attenuated Ezh2 binding to bdP and restored antisense β-MHC and α-MHC gene expression. RNA-chromatin immunoprecipitation experiments in TAC hearts also show increased pri-miR-208b dependent-chromatin binding. These results are the first description by which primary miR interactions serve to integrate chromatin modifications and the transcriptional response to distinct signaling cues in the heart. These studies provide a framework for MHC expression and regulation of genes implicated in pathological remodeling of ventricular hypertrophy.
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