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Updated: May 17, 2026
12:55
Purification of Progenitors from Skeletal Muscle
Published on: March 16, 2011
Two distinct muscle progenitor populations coexist throughout amniote development
Cyril A Picard1, Christophe Marcelle
1EMBL Australia, Australian Regenerative Medicine Institute (ARMI), Monash University, Building 75, Clayton, VIC 3800, Australia.
Developmental Biology
|October 23, 2012
Summary
Skeletal muscle growth relies on two progenitor cell populations, Pax7+ and Pax7/Myf5+, that decrease proliferation and increase quiescence during development, ensuring muscle homeostasis in chicks and mice.
Area of Science:
- Developmental biology
- Muscle stem cell biology
- Comparative embryology
Background:
- Skeletal muscle development depends on muscle progenitor cells, which give rise to adult satellite cells.
- The homeostasis of these progenitors during embryogenesis is not well understood.
- Previous studies in chick and mouse yielded conflicting results regarding progenitor populations.
Purpose of the Study:
- To comprehensively analyze muscle progenitor cell differentiation and proliferation during embryonic and fetal development.
- To compare progenitor cell behavior in chick and mouse models.
- To elucidate the cellular strategies governing muscle growth and homeostasis.
Main Methods:
- Immunostaining for myogenic differentiation markers (Pax7, Myf5) in chick and mouse embryos.
- Analysis of progenitor cell populations from early emergence to late fetal stages.
- Assessment of cell proliferation, differentiation, and quiescence.
Main Results:
- Identified two co-existing progenitor populations: a minor slow-cycling Pax7+ pool and a major fast-cycling Pax7/Myf5+ pool.
- Both progenitor populations showed decreased proliferation rates with increasing embryonic age.
- A significant portion of both progenitor types entered quiescence during development.
Conclusions:
- Muscle growth during embryonic and fetal development is orchestrated by two conserved progenitor populations in amniotes.
- Tight regulation of proliferation, quiescence, and cell cycle length maintains muscle progenitor homeostasis.
- These findings highlight conserved cellular strategies for muscle development across evolution.
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