Abstract
Expression of the myogenic helix-loop-helix (HLH) protein myogenin in muscle cell precursors within somites and limb buds is among the earliest events associated with myogenic lineage determination in vertebrates. Mutations in the myogenin promoter that abolish binding sites for myogenic HLH proteins or myocyte enhancer factor-2 (MEF-2) suppressed transcription of a linked lacZ transgene in subsets of myogenic precursors in mouse embryos. These results suggest that myogenic HLH proteins and MEF-2 participate in separable regulatory circuits leading to myogenin transcription and provide evidence for positional regulation of myogenic regulators in the embryo.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Binding Sites
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism
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Embryo, Mammalian / metabolism*
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Extremities / embryology
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Female
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MEF2 Transcription Factors
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Male
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Mice
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Mice, Inbred C57BL
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Mice, Inbred CBA
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Mice, Transgenic
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Muscle Proteins / genetics*
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Muscles / embryology*
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Muscles / metabolism
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Mutation
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Myogenic Regulatory Factors
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Myogenin
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Promoter Regions, Genetic
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Trans-Activators / genetics*
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Transcription Factors / genetics
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Transcription Factors / metabolism
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Transcription, Genetic*
Substances
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DNA-Binding Proteins
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MEF2 Transcription Factors
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Muscle Proteins
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Myog protein, mouse
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Myogenic Regulatory Factors
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Myogenin
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Trans-Activators
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Transcription Factors