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© Research
Publication : Genes & development

Sonic hedgehog acts cell-autonomously on muscle precursor cells to generate limb muscle diversity

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Genes & development - 15 Sep 2012

Anderson C, Williams VC, Moyon B, Daubas P, Tajbakhsh S, Buckingham ME, Shiroishi T, Hughes SM, Borycki AG

Link to Pubmed [PMID] – 22987640

Genes Dev. 2012 Sep;26(18):2103-17

How muscle diversity is generated in the vertebrate body is poorly understood. In the limb, dorsal and ventral muscle masses constitute the first myogenic diversification, as each gives rise to distinct muscles. Myogenesis initiates after muscle precursor cells (MPCs) have migrated from the somites to the limb bud and populated the prospective muscle masses. Here, we show that Sonic hedgehog (Shh) from the zone of polarizing activity (ZPA) drives myogenesis specifically within the ventral muscle mass. Shh directly induces ventral MPCs to initiate Myf5 transcription and myogenesis through essential Gli-binding sites located in the Myf5 limb enhancer. In the absence of Shh signaling, myogenesis is delayed, MPCs fail to migrate distally, and ventral paw muscles fail to form. Thus, Shh production in the limb ZPA is essential for the spatiotemporal control of myogenesis and coordinates muscle and skeletal development by acting directly to regulate the formation of specific ventral muscles.

http://www.ncbi.nlm.nih.gov/pubmed/22987640