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doi: 10.1242/10.1242/dev.00552


1 Département de Biologie du Développement, CNRS URA 2578,
Institut Pasteur, 25 rue du Dr Roux, 75015 Paris, France
2 Section of Gene Function and Regulation, The Institute of Cancer Research,
Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK
Author for correspondence (e-mail:
margab{at}pasteur.fr)
Accepted 16 April 2003
Myf5 is the first myogenic regulatory factor to be expressed in the mouse embryo and it determines the entry of cells into the skeletal muscle programme. A region situated between -58 kb and -48 kb from the gene directs Myf5 transcription at sites where muscles will form. We now show that this region consists of a number of distinct regulatory elements that specifically target sites of myogenesis in the somite, limbs and hypoglossal cord, and also sites of Myf5 transcription in the central nervous system. Deletion of these sequences in the context of the locus shows that elements within the region are essential, and also reveals the combinatorial complexity of the transcriptional regulation of Myf5. Both within the -58 kb to -48 kb region and elsewhere in the locus, multiple sequences are present that direct transcription in subdomains of a single site during development, thus revealing distinct phases of myogenesis when subpopulations of progenitor cells enter the programme of skeletal muscle differentiation.
Key words: Myf5, Mouse embryo, Myogenesis, Transcriptional regulation, BACs, Myotome, Limb, CNS
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