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MiR-206 knockout shows it is critical for myogenesis and directly regulates newly identified target mRNAs

ABSTRACT: The goal of this study was to identify miR-206 regulated mRNA targets in differentiating C2C12 cells

ORGANISM(S): Mus musculus

PROVIDER: GSE143029 | GEO | 2020/03/04

REPOSITORIES: GEO

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miR-206 knockout shows it is critical for myogenesis and directly regulates newly identified target mRNAs.

Project description:The muscle specific miRNA, miR-206, is important for the process of myogenesis; however, studying the function of miR-206 in muscle development and differentiation still proves challenging because the complement of mRNA targets it regulates remains undefined. In addition, miR-206 shares close sequence similarity to miR-1, another muscle specific miRNA, making it hard to study the impact of miR-206 alone in cell culture models. Here we used CRISPR/Cas9 technology to knockout miR-206 in C2C12 muscle cells. We show that knocking out miR-206 significantly impairs and delays differentiation and myotube formation, revealing that miR-206 alone is important for myogenesis. In addition, we use an experimental affinity purification technique to identify new mRNA targets of miR-206 in C2C12 cells. We identified over one hundred mRNAs as putative miR-206 targets. Functional experiments on six of these targets indicate that Adam19, Bgn, Cbx5, Smarce1, and Spg20 are direct miR-206 targets in C2C12 cells. Our data show a unique and important role for miR-206 in myogenesis.

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Novel players in myogenesis identified by target validation for muscle specific microRNAs in C2C12 myoblasts

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Project description:miR-206, miR-1a-1 and miR-1a-2, foundational members of the myomir family, promote skeletal muscle differentiation and have complete identity in the seed sequence, suggesting functional redundancy. To test if the essential role of these three microRNAs in skeletal myogenesis was masked by redundant function of at least one of the three miRNA left in the cells in previous reports, we generated triple KO (tKO) C2C12 cells by CRISPR/Cas9 (in vitro) and triple KO mice (in vivo model). tKO myoblasts differentiate, producing similar levels of promyogenic mRNAs and normal fusion index. RNAseq analysis confirms tKO clones differentiate but also reveals decrease in mRNA levels of genes related to mitochondrial oxidative phosphorylation. Dimished mitochondria function in tKO cells was confirmed using Seahorse assay. The targets of miR-206/-1a are specifically upregulated during differentiation of tKO myoblasts, when the microRNAs are normally induced, confirming the complete loss of the three microRNA genes. Although we observe partial embryonic lethality of tKO mice, the live mice grow normally to adulthood, have the same size of skeletal muscles as control animals, but perform worse on physical activity tests, which may be partially explained by smaller skeletal muscle fiber diameters. Thus these three myomiRs are not essential for skeletal muscle differentiation but are required for optimal differentiation and provide a clear example of the microRNAs not being a switch but a modulator of differentiation.

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