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Mol. Cell. Biol., Feb 1997, 656-666, Vol 17, No. 2
F Spitz, M Salminen, J Demignon, A Kahn, D Daegelen and P Maire
The human aldolase A pM promoter is active in fast-twitch muscles. To
understand the role of the different transcription factors which bind to
this promoter and determine which ones are responsible for its restricted
pattern of expression, we analyzed several transgenic lines harboring
different combinations of pM regulatory elements. We show that
muscle-specific expression can be achieved without any binding sites for
the myogenic factors MyoD and MEF2 and that a 64-bp fragment comprising a
MEF3 motif and an NFI binding site is sufficient to drive reporter gene
expression in some but, interestingly, not all fast- twitch muscles. A
result related to this pattern of expression is that some isoforms of NFI
proteins accumulate differentially in fast- and slow-twitch muscles and in
distinct fast-twitch muscles. We propose that these isoforms of NFI
proteins might provide a molecular basis for skeletal muscle diversity.
Copyright © 1997, American Society for Microbiology
A combination of MEF3 and NFI proteins activates transcription in a subset of fast-twitch muscles
Institut Cochin de Genetique Moleculaire, INSERM U129, Universite Rene Descartes, Paris, France.
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