Understanding developmental networks has recently been enhanced through the identification of a large number of conserved essential regulators. Interspecies comparisons of the transcriptional networks regulated by these factors are still at a rather early stage, with limited global data available. Here we use the accumulating phenotypic information from multiple species to provide initial insights into the wiring and rewiring of developmental networks, with particular emphasis on myogenesis, a highly conserved developmental process. This review highlights the most recent findings on the transcriptional program driving Drosophila myogenesis and compares this with vertebrates, revealing emerging themes that may be applicable to other developmental contexts.
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