The nuclear envelope protein Net39 is essential for muscle nuclear integrity and chromatin organization.

The nuclear envelope protein Net39 is essential for muscle nuclear integrity and chromatin organization.
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DOI:
10.1038/s41467-021-20987-x
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发表时间:
2021-01-29
影响因子:
16.6
通讯作者:
Olson EN
Olson EN
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ramirez-Martinez A;Zhang Y;Chen K;Kim J;Cenik BK;McAnally JR;Cai C;Shelton JM;Huang J;Brennan A;Evers BM;Mammen PPA;Xu L;Bassel-Duby R;Liu N;Olson EN

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核被膜内的核纤层蛋白和跨膜蛋白调节核结构和染色质组织。核膜跨膜蛋白39(Net 39)是一种肌肉核膜蛋白,其在体内的功能尚未被研究。我们发现,缺乏Net 39的小鼠屈服于严重的肌病和青少年致死性,伴随着核完整性,染色质可及性,基因表达和代谢的破坏。这些异常类似于由A型核纤层蛋白(LMNA)和其他基因(如Emerin(EMD))突变引起的Emery-Dreifuss肌营养不良症(EDMD)。我们观察到Net 39在EDMD患者中下调,表明Net 39与这种疾病的发病机制有关。我们的研究结果强调了Net 39在核膜中维持肌肉染色质组织,基因表达和功能的作用,以及其对EDMD分子病因学的潜在贡献。核被膜将染色质束缚在核外围以控制基因组结构。在这里,作者表明Net 39保留了小鼠肌核的完整性和基因表达,它可能有助于Emery-Dreifuss肌营养不良症的发病机制。
Lamins and transmembrane proteins within the nuclear envelope regulate nuclear structure and chromatin organization. Nuclear envelope transmembrane protein 39 (Net39) is a muscle nuclear envelope protein whose functions in vivo have not been explored. We show that mice lacking Net39 succumb to severe myopathy and juvenile lethality, with concomitant disruption in nuclear integrity, chromatin accessibility, gene expression, and metabolism. These abnormalities resemble those of Emery–Dreifuss muscular dystrophy (EDMD), caused by mutations in A-type lamins (LMNA) and other genes, like Emerin (EMD). We observe that Net39 is downregulated in EDMD patients, implicating Net39 in the pathogenesis of this disorder. Our findings highlight the role of Net39 at the nuclear envelope in maintaining muscle chromatin organization, gene expression and function, and its potential contribution to the molecular etiology of EDMD. The nuclear envelope tethers chromatin to the nuclear periphery to control genome architecture. Here, the authors show that Net39 preserves the integrity and gene expression of muscle nuclei in mice, and it may contribute to the pathogenesis of Emery–Dreifuss muscular dystrophy.
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