数字农科院2.0

Sp1-mediated circrna circhipk2 regulates myogenesis by targeting ribosomal protein rpl7

文献类型： 外文期刊

作者： Yan Junyu;Yang Yalan;Fan Xinhao;Tang Yijie;Tang Zhonglin

作者机构：

关键词： CircHipk2;CircRNA; Myogenesis;Rpl7;Skeletal muscle;Sp1

期刊名称： Genes

ISSN： 2073-4425

年卷期： 2021 年 12 卷 5 期

页码：

收录情况： JCR（2021版）

摘要： Circular RNAs (circRNAs) represent a class of covalently closed single-stranded RNA molecules that are emerging as essential regulators of various biological processes. The circRNA circHipk2 originates from exon 2 of the Hipk2 gene in mice and was reported to be involved in acute promyelocytic leukemia and myocardial injury. However, the functions and mechanisms of circHipk2 in myogenesis are largely unknown. Here, to deepen our knowledge about the role of circHipk2, we studied the expression and function of circHipk2 during skeletal myogenesis. We found that circHipk2 was mostly distributed in the cytoplasm, and dynamically and differentially expressed in various myogenesis systems in vitro and in vivo. Functionally, overexpression of circHipk2 inhibited myoblast proliferation and promoted myotube formation in C2C12 cells, whereas the opposite effects were observed after circHipk2 knockdown. Mechanistically, circHipk2 could directly bind to ribosomal protein Rpl7, an essential 60S preribosomal assembly factor, to inhibit ribosome translation. In addition, we verified that transcription factor Sp1 directly bound to the promoter of circHipk2 and affected the expression of Hipk2 and circHipk2 in C2C12 myoblasts. Collectively, these findings identify circHipk2 as a candidate circRNA regulating ribosome biogenesis and myogenesis proliferation and differentiation. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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