一个长的非编码RNA保护心脏免受病理性缩.
Pei Han1,2, Wei Li1, Chiou-Hong Lin1
1Division of Cardiovascular Medicine, Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305.
Nature
|August 15, 2014
概括
最近发现的一种心脏特异性的长非编码RNA,Mhrt,通过抑制染色质重塑剂Brg1.1,来保护成年人的心脏. 失去Mhrt对于心力衰竭的发展至关重要,但恢复它可以防止心脏功能障碍.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 心脏病学 心脏病学
背景情况:
- 长非编码RNAs (lncRNAs) 在成人心脏功能中的作用以及它们对核细胞重塑的调制仍然基本上是未知的.
- 反意义转录是普遍存在的,肌重链7 (Myh7) 是一个关键的基因编码蛋白质的关键基因,对心脏收缩至关重要.
研究的目的:
- 在成年人心脏中识别和表征新型 lncRNA.
- 阐明 lncRNA 与染色体重塑复合体相互作用的机制.
- 研究这些lncRNAs在心力衰竭和心肌病的发展中的作用.
主要方法:
- 鉴定和表征来自小鼠Myh7位点的心脏特异性lncRNA转录,命名为Mhrt.
- 在病理性压力下研究Mhrt与Brg1-Hdac-Parp染色体抑制复合物的相互作用.
- 分析Mhrt在防止Brg1与基因组DNA标结合中的作用及其对染色体重塑的影响.
主要成果:
- Mhrt是一种特定于心脏的,在成人心脏中丰富的lncRNA,通过Brg1-Hdac-Parp复合体被病理压力抑制.
- 抑制Mhrt对于心肌病的发展至关重要;恢复Mhrt水平可以防止心脏缩和衰竭.
- Mhrt直接与Brg1的酶域结合,竞争性地抑制其DNA结合活性,并防止异常基因表达和心脏肌病.
结论:
- 涉及Mhrt和Brg1的新型lncRNA-染色质机制对于维持心脏功能至关重要.
- 红作为心脏保护因子,通过对抗压力诱导的染色质重塑作用.
- 这项研究为lncRNA-染色质相互作用建立了新的范式,并确定了人类心肌病的保存机制.
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