E2F1-miR-20a-5p/20b-5p auto-regulatory feedback loop involved in myoblast proliferation and differentiation

文献类型： 外文期刊

第一作者： Luo, Wen

作者： Luo, Wen;Li, Guihuan;Yi, Zhenhua;Nie, Qinghua;Zhang, Xiquan;Luo, Wen;Li, Guihuan;Yi, Zhenhua;Nie, Qinghua;Zhang, Xiquan;Luo, Wen;Li, Guihuan;Yi, Zhenhua;Nie, Qinghua;Zhang, Xiquan

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2016 年 6 卷

页码：

收录情况： SCI

摘要： miR-17 family microRNAs (miRNAs) are crucial for embryo development, however, their role in muscle development is still unclear. miR-20a-5p and miR-20b-5p belong to the miR-17 family and are transcribed from the miR-17-92 and miR-106a-363 clusters respectively. In this study, we found that miR-20a-5p and miR-20b-5p promoted myoblast differentiation and repressed myoblast proliferation by directly binding the 3' UTR of E2F transcription factor 1 (E2F1) mRNA. E2F1 is an important transcriptional factor for organism's normal development. Overexpression of E2F1 in myoblasts promoted myoblast proliferation and inhibited myoblast differentiation. Conversely, E2F1 inhibition induced myoblast differentiation and repressed myoblast proliferation. Moreover, E2F1 can bind directly to promoters of the miR-17-92 and miR-106a-363 clusters and activate their transcription, and E2F1 protein expression is correlated with the expression of pri-miR-17-92 and pri-miR-106a-363 during myoblast differentiation. These results suggested an auto-regulatory feedback loop between E2F1 and miR-20a-5p/20b-5p, and indicated that miR-20a-5p, miR-20b-5p and E2F1 are involved in myoblast proliferation and differentiation through the auto-regulation between E2F1 and miR-20a5p/20b-5p. These findings provide new insight into the mechanism of muscle differentiation, and further shed light on the understanding of muscle development and muscle diseases.

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