A role for the myogenic determination gene Myf5 in adult regenerative myogenesis

B Gayraud-Morel, F Chretien, P Flarnant, D Gomes, P S Zammit, S Tajbakhsh

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

The myogenic determination genes Myf5, Myod and Mrf4 direct skeletal muscle cell fate prenatally. In adult myogenesis, Myod has been shown to regulate myoblast differentiation, however, our understanding of satellite cell regulation is incomplete since the roles of Myf5 and Mrf4 had not been clearly defined. Here we examine the function of Myf5 and Mrf4 in the adult using recently generated alleles. Mrf4 is not expressed in normal or Myf5 null satellite cells and myoblasts, therefore excluding a role for this determination gene in adult muscle progenitors. Skeletal muscles of adult Myf5 null mice exhibit a subtle progressive myopathy. Crucially, adult Myf5 null mice exhibit perturbed muscle regeneration with a significant increase in muscle fibre hypertrophy, delayed differentiation, adipocyte accumulation, and fibrosis after freeze-injury. Satellite cell numbers are not significantly altered in Myf5 null animals and they show a modest impaired proliferation under some conditions in vitro. Mice double mutant for Myf5 and Dystrophin were more severely affected than single mutants, with enhanced necrosis and regeneration. Therefore, we show that Myf5 is a regulator of regenerative myogenesis and homeostasis, with functions distinct from those of Myod and Mrf4. (C) 2007 Elsevier Inc. All rights reserved
Original languageEnglish
Pages (from-to)13 - 28
Number of pages16
JournalDevelopmental Biology
Volume312
Issue number1
DOIs
Publication statusPublished - 1 Dec 2007

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