In vertebrates, despite the evidence that extrinsic factors induce myogenesis in naive mesoderm, other experiments argue that the initiation of the myogenic program may take place independent of these factors. To resolve this discrepancy, we have re-addressed this issue, using short-term in vivo microsurgery and culture experiments in chick. Our results show that the initial expression of the muscle-specific markers Myf5 and MyoD is regulated in a mesoderm-autonomous fashion. The reception of a Wnt signal is required for MyoD, but not Myf5 expression;however, we show that the source of the Wnt signal is intrinsic to the mesoderm. Gain- and loss-of-function experiments indicate that Wnt5b,which is expressed in the presomitic mesoderm, represents the MyoD-activating cue. Despite Wnt5b expression in the presomitic mesoderm, MyoD is not expressed in this tissue: our experiments demonstrate that this is due to a Bmp inhibitory signal that prevents the premature expression of MyoD before somites form. Our results indicate that myogenesis is a multistep process which is initiated prior to somite formation in a mesoderm-autonomous fashion; as somites form,influences from adjacent tissues are likely to be required for maintenance and patterning of early muscles.
Intrinsic signals regulate the initial steps of myogenesis in vertebrates
These authors contributed equally to this work
Present address: University College London, Department of Anatomy and Developmental Biology, Gower Street, London WC1E 6BT, UK
Claudia Linker, Cynthia Lesbros, Michael R. Stark, Christophe Marcelle; Intrinsic signals regulate the initial steps of myogenesis in vertebrates. Development 15 October 2003; 130 (20): 4797–4807. doi: https://doi.org/10.1242/dev.00688
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