E2F1-miR-20a-5p/20b-5p Auto-regulatory Feedback Loop Involved in Myoblast Proliferation and Differentiation

Overview

Journal Sci Rep

Specialty Science

Date 2016 Jun 11

PMID 27282946

Citations 49

Authors

Wen Luo

Guihuan Li

Zhenhua Yi

Qinghua Nie

Xiquan Zhang

Affiliations

Soon will be listed here.

Abstract

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-20a-5p/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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