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JOURNAL ARTICLES
Pax-3 is required for the development of limb muscles: a possible role for the migration of dermomyotomal muscle progenitor cells
E. Bober, T. Franz, H.H. Arnold, P. Gruss, P. Tremblay
Development 1994 120: 603-612;

Summary

Limb muscles in vertebrates originate from dermomyotomal cells, which during early development migrate from the ventrolateral region of somites into the limb buds. These progenitor cells do not express any muscle-specific marker genes or myogenic transcription factors until they reach their destination in the limbs. Here, we demonstrate by in situ hybridization that myogenic cells in somites and a population of presumably migratory muscle precursor cells in somatopleural tissue as well as myoblasts in the developing limbs express Pax-3. Significantly, in homozygous splotch mutant mice, which synthesize altered Pax-3 mRNA but make no normal protein, no cells positive for Pax-3 transcripts can be detected in the region of migrating limb muscle precursors or in the limb itself. In contrast, myotomal precursor cells and axial skeletal muscles contain Pax-3 transcripts also in the mutant. Interestingly, these animals fail to develop limb musculature as demonstrated by the lack of hybridization with various probes for myogenic transcription factors (Myf-5, myogenin, MyoD) but make apparently normal axial muscles. These observations suggest that Pax-3 is necessary for the formation of limb muscles, affecting either the generation of myogenic precursors in the somitic dermomyotome or the migration of these cells into the limb field.

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JOURNAL ARTICLES
Pax-3 is required for the development of limb muscles: a possible role for the migration of dermomyotomal muscle progenitor cells
E. Bober, T. Franz, H.H. Arnold, P. Gruss, P. Tremblay
Development 1994 120: 603-612;
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