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. 1986 Jun;6(6):2125–2136. doi: 10.1128/mcb.6.6.2125

Upstream regions of the human cardiac actin gene that modulate its transcription in muscle cells: presence of an evolutionarily conserved repeated motif.

A Minty, L Kedes
PMCID: PMC367753  PMID: 3785189

Abstract

Transfection into cultured cell lines was used to investigate the transcriptional regulation of the human cardiac actin gene. We first demonstrated that in both human heart and human skeletal muscle, cardiac actin mRNAs initiate at the identical site and contain the same first exon, which is separated from the first coding exon by an intron of 700 base pairs. A region of 485 base pairs upstream from the transcription initiation site of the human cardiac actin gene directs high-level transient expression of the bacterial chloramphenicol acetyltransferase gene in differentiated myotubes of the mouse C2C12 muscle cell line, but not in mouse L fibroblast or rat PC-G2 pheochromocytoma cells. Deletion analysis of this region showed that at least two physically separated sequence elements are involved, a distal one starting between -443 and -395 and a proximal one starting between -177 and -118, and suggested that these sequences interact with positively acting transcriptional factors in muscle cells. When these two sequence elements are inserted separately upstream of a heterologous (simian virus 40) promoter, they do not affect transcription but do give a small (four- to fivefold) stimulation when tested together. Overall, these regulatory regions upstream of the cap site of the human cardiac actin gene show remarkably high sequence conservation with the equivalent regions of the mouse and chick genes. Furthermore, there is an evolutionarily conserved repeated motif that may be important in the transcriptional regulation of actin and other contractile protein genes.

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Selected References

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