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Autonomous Activity of the Alternate Aldolase A Muscle Promoter is Maintained by a Sequestering Mechanism

Overview
Specialty Biochemistry
Date 1992 Jan 25
PMID 1741258
Citations 3
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Abstract

The mouse aldolase A gene contains two closely-spaced alternate promoter/first exons. The more distal of the two, the M promoter, is muscle-specific while the 3' promoter, the H promoter, is expressed constitutively. Various segments from these promoter regions were linked to a reporter gene and used to transfect the myogenic cell line C2C12 and the hepatoma cell line BWTG3. A muscle-specific enhancer, MEN1, responsible for 80% of promoter M activity and containing 4 consensus MyoD binding sites was localized between -2578 to -2723 of the M promoter. Another muscle-specific enhancer and a restrictive element, MEN2/MSE, were found in the interval -1100 to -350. The MSE restrictive element was found to prohibit inappropriate up-regulation of the M promoter by selectively sequestering it from H promoter elements in both myoblasts and myotubes. Among the H promoter elements was found an enhancer, HEN, situated between -533 and -200 which did not function in myotubes. These studies also show that H promoter elements can act synergistically with a non-specific element, MAE, located between -350 and -130 of the M cap site greatly stimulating M promoter transcription in all cell types when the MSE restrictive element was absent. Through the analysis of interactions between these elements and the aldolase A and HSV-TK promoters we showed that neither the enhancers nor the promoter proximal sequences by themselves contain adequate information to reproduce the native pattern of aldolase A promoter modulation. Rather, the sequestering of the M promoter by the MSE restrictive element and the relative positioning and context of promoters M and H appear critical to the regulated expression of aldolase A.

Citing Articles

Independence and interdependence of the three human aldolase A promoters in transgenic mice.

Moch C, Kahn A, Daegelen D Gene Expr. 1996; 6(1):1-14.

PMID: 8931987 PMC: 6148263.


An opportunistic promoter sharing regulatory sequences with either a muscle-specific or a ubiquitous promoter in the human aldolase A gene.

Concordet J, Salminen M, Demignon J, Moch C, Maire P, Kahn A Mol Cell Biol. 1993; 13(1):9-17.

PMID: 8417365 PMC: 358879. DOI: 10.1128/mcb.13.1.9-17.1993.


Fast-muscle-specific expression of human aldolase A transgenes.

Salminen M, Maire P, Concordet J, Moch C, Porteu A, Kahn A Mol Cell Biol. 1994; 14(10):6797-808.

PMID: 7935397 PMC: 359210. DOI: 10.1128/mcb.14.10.6797-6808.1994.

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