Dysregulated ribonucleoprotein granules promote cardiomyopathy in RBM20 gene-edited pigs.

Dysregulated ribonucleoprotein granules promote cardiomyopathy in RBM20 gene-edited pigs.
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DOI:
10.1038/s41591-020-1087-x
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发表时间:
2020-11
期刊:
影响因子:
82.9
通讯作者:
Nelson, Timothy J.
Nelson, Timothy J.
中科院分区:
医学1区
文献类型:
--
作者:
Schneider, Jay W.;Oommen, Saji;Qureshi, Muhammad Y.;Goetsch, Sean C.;Pease, David R.;Sundsbak, Rhianna S.;Guo, Wei;Sun, Mingming;Sun, Han;Kuroyanagi, Hidehito;Webster, Dennis A.;Coutts, Alexander W.;Holst, Kimberly A.;Edwards, Brooks S.;Newville, Nikolas;Hathcock, Matthew A.;Melkamu, Tamene;Briganti, Francesca;Wei, Wu;Romanelli, Maria G.;Fahrenkrug, Scott C.;Frantz, Doug E.;Olson, Timothy M.;Steinmetz, Lars M.;Carlson, Daniel F.;Nelson, Timothy J.

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核糖核蛋白(Ribonucleoprotein,RNP)颗粒是一种生物分子凝聚物-液-液相分离的液滴,它组织和管理信使RNA代谢、细胞信号传导、生物聚合物组装、生化反应和细胞逆境的应激颗粒反应。RNP颗粒失调驱动神经肌肉退行性疾病,但以前没有与心力衰竭有关。通过探索先天性扩张型心肌病(DCM)的分子基础,在基因组编辑的猪中,RBM 20等位基因编码人类RNA结合基序蛋白-20(RBM 20)的致病性R636 S变体,我们发现RNP颗粒在肌浆中异常积累,我们在携带R636 S等位基因的DCM患者的心肌和重编程心肌细胞中证实了这一发现。调节异常的肌浆RBM 20 RNP颗粒显示出液体样的物质特性,沿沿着细胞骨架元件以精确间隔停靠,促进心脏生物分子的相分配并与应激颗粒融合。我们的研究结果将RNP颗粒失调与基因编辑猪和RBM 20突变引起的DCM患者的心肌细胞病理学和心力衰竭联系起来。
Ribonucleoprotein (RNP) granules are biomolecular condensates—liquid–liquid phase-separated droplets that organize and manage messenger RNA metabolism, cell signaling, biopolymer assembly, biochemical reactions and stress granule responses to cellular adversity. Dysregulated RNP granules drive neuromuscular degenerative disease but have not previously been linked to heart failure. By exploring the molecular basis of congenital dilated cardiomyopathy (DCM) in genome-edited pigs homozygous for an RBM20 allele encoding the pathogenic R636S variant of human RNA-binding motif protein-20 (RBM20), we discovered that RNP granules accumulated abnormally in the sarcoplasm, and we confirmed this finding in myocardium and reprogrammed cardiomyocytes from patients with DCM carrying the R636S allele. Dysregulated sarcoplasmic RBM20 RNP granules displayed liquid-like material properties, docked at precisely spaced intervals along cytoskeletal elements, promoted phase partitioning of cardiac biomolecules and fused with stress granules. Our results link dysregulated RNP granules to myocardial cellular pathobiology and heart failure in gene-edited pigs and patients with DCM caused by RBM20 mutation.
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