Rtf1 Transcriptionally Regulates Neonatal and Adult Cardiomyocyte Biology.

Rtf1 Transcriptionally Regulates Neonatal and Adult Cardiomyocyte Biology.
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RTF1转录调节新生儿和成人心肌细胞生物学。

DOI:
10.3390/jcdd10050221
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发表时间:
2023-05-20
影响因子:
2.4
通讯作者:
--
中科院分区:
医学3区
文献类型:
--
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PAF1 复合体成分 Rtf1 是一种 RNA 聚合酶 II 相互作用的转录调节蛋白,可促进转录延伸和组蛋白 2B 的共转录单泛素化。 Rtf1 在早期胚胎发生过程中侧板中胚层心脏祖细胞的规范中发挥着重要作用,但其在成熟心脏细胞中的需求尚不清楚。在这里,我们使用敲低和基因敲除方法研究了 Rtf1 在新生儿和成人心肌细胞中的重要性。我们证明,新生儿心肌细胞中 Rtf1 活性的丧失会破坏细胞形态并导致肌节分解。同样,成年小鼠心脏成熟心肌细胞中 Rtf1 的消除会导致肌原纤维解体、细胞间连接破坏、纤维化和收缩功能障碍。 Rtf1 敲除心脏最终衰竭并表现出类似于扩张型心肌病的结构和基因表达缺陷。有趣的是,我们观察到 Rtf1 活性的丧失会导致新生儿和成人心肌细胞中关键心脏结构和功能基因的表达发生快速变化,这表明 Rtf1 持续需要来支持心脏基因程序的表达。
The PAF1 complex component Rtf1 is an RNA Polymerase II-interacting transcription regulatory protein that promotes transcription elongation and the co-transcriptional monoubiquitination of histone 2B. Rtf1 plays an essential role in the specification of cardiac progenitors from the lateral plate mesoderm during early embryogenesis, but its requirement in mature cardiac cells is unknown. Here, we investigate the importance of Rtf1 in neonatal and adult cardiomyocytes using knockdown and knockout approaches. We demonstrate that loss of Rtf1 activity in neonatal cardiomyocytes disrupts cell morphology and results in a breakdown of sarcomeres. Similarly, Rtf1 ablation in mature cardiomyocytes of the adult mouse heart leads to myofibril disorganization, disrupted cell–cell junctions, fibrosis, and systolic dysfunction. Rtf1 knockout hearts eventually fail and exhibit structural and gene expression defects resembling dilated cardiomyopathy. Intriguingly, we observed that loss of Rtf1 activity causes a rapid change in the expression of key cardiac structural and functional genes in both neonatal and adult cardiomyocytes, suggesting that Rtf1 is continuously required to support expression of the cardiac gene program.
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