Converging Pathways Involving MicroRNA-206 and the RNA-binding Protein KSRP Control Post-transcriptionally Utrophin A Expression in Skeletal Muscle

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2013 Dec 28

PMID 24371285

Citations 16

Authors

Adel Amirouche

Helina Tadesse

Pedro Miura

Guy Belanger

John A Lunde

Jocelyn Cote

Bernard J Jasmin

Affiliations

Soon will be listed here.

Abstract

Several reports have previously highlighted the potential role of miR-206 in the post-transcriptional downregulation of utrophin A in cultured cells. Along those lines, we recently identified K-homology splicing regulator protein (KSRP) as an important negative regulator in the post-transcriptional control of utrophin A in skeletal muscle. We sought to determine whether these two pathways act together to downregulate utrophin A expression in skeletal muscle. Surprisingly, we discovered that miR-206 overexpression in cultured cells and dystrophic muscle fibers causes upregulation of endogenous utrophin A levels. We further show that this upregulation of utrophin A results from the binding of miR-206 to conserved sites located in the 3'-UTR (untranslated region) of KSRP, thus causing the subsequent inhibition of KSRP expression. This miR-206-mediated decrease in KSRP levels leads, in turn, to an increase in the expression of utrophin A due to a reduction in the activity of this destabilizing RNA-binding protein. Our work shows that miR-206 can oscillate between direct repression of utrophin A expression via its 3'-UTR and activation of its expression through decreased availability of KSRP and interactions with AU-rich elements located within the 3'-UTR of utrophin A. Our study thus reveals that two apparent negative post-transcriptional pathways can act distinctively as molecular switches causing repression or activation of utrophin A expression.

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