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Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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Overview of Regeneration and Repair

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Related Experiment Video

Updated: Jul 26, 2026

Purification of Progenitors from Skeletal Muscle
12:55

Purification of Progenitors from Skeletal Muscle

Published on: March 16, 2011

Embryonic myogenesis pathways in muscle regeneration.

Po Zhao1, Eric P Hoffman

  • 1Center for Genetic Medicine, Children's National Medical Center, Washington, DC, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|January 28, 2004
PubMed
Summary

Muscle regeneration in adults does not fully recapitulate embryonic development. Key embryonic pathways like Wnt, Shh, and BMP are absent, while cell-autonomous factors such as FGFR4 and myogenic regulatory factors are reactivated during muscle repair.

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Published on: August 24, 2017

Area of Science:

  • Muscle biology
  • Developmental biology
  • Regenerative medicine

Background:

  • Muscle regeneration is believed to mimic embryonic myogenesis.
  • However, the specific signaling pathways involved in adult muscle repair remain unclear.
  • Understanding these pathways is crucial for advancing regenerative therapies.

Purpose of the Study:

  • To identify which embryonic myogenesis pathways are active during adult muscle regeneration.
  • To compare the molecular mechanisms of embryonic development and adult repair.
  • To elucidate the key signaling molecules and factors involved in muscle regeneration.

Main Methods:

  • A detailed time-course analysis of muscle regeneration in vivo over 27 time points.
  • Quantitative analysis of gene and protein expression.
  • Investigation of specific signaling pathways including Wnt, Shh, BMP, FGFR4, and Notch1.
  • Identification of myogenic regulatory factors and their coactivators/repressors.

Main Results:

  • Embryonic pathways (Wnt, Shh, BMP) were not induced during muscle regeneration.
  • Antagonists of Wnt signaling were upregulated, indicating active inhibition.
  • The pro-differentiation FGFR4 pathway was transiently expressed, alongside key myogenic regulatory factors (MyoD, Myogenin, Myf5, Pax7).
  • FGF6 was identified as a likely ligand for FGFR4, released from damaged muscle fibers.
  • Notch1 activation and MyoD coactivator/repressor dynamics were confirmed.

Conclusions:

  • Adult muscle regeneration does not re-activate embryonic positional signals (Wnt, Shh, BMP).
  • Cell-autonomous factors, including Pax7, myogenic regulatory factors, and FGFR4, are recapitulated during muscle repair.
  • These findings highlight distinct molecular mechanisms between embryonic myogenesis and adult muscle regeneration.