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Molecular and Cellular Biology, October 2002, p. 7066-7082, Vol. 22, No. 20
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.20.7066-7082.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The Myostatin Gene Is a Downstream Target Gene of Basic Helix-Loop-Helix Transcription Factor MyoD

Michael P. Spiller, Ravi Kambadur, Ferenc Jeanplong, Mark Thomas, Julie K. Martyn,{dagger} John J. Bass, and Mridula Sharma*

Animal Genomics, AgResearch, Hamilton, New Zealand

Received 4 April 2002/ Returned for modification 9 May 2002/ Accepted 16 July 2002

Myostatin is a negative regulator of myogenesis, and inactivation of myostatin leads to heavy muscle growth. Here we have cloned and characterized the bovine myostatin gene promoter. Alignment of the upstream sequences shows that the myostatin promoter is highly conserved during evolution. Sequence analysis of 1.6 kb of the bovine myostatin gene upstream region revealed that it contains 10 E-box motifs (E1 to E10), arranged in three clusters, and a single MEF2 site. Deletion and mutation analysis of the myostatin gene promoter showed that out of three important E boxes (E3, E4, and E6) of the proximal cluster, E6 plays a significant role in the regulation of a reporter gene in C2C12 cells. We also demonstrate by band shift and chromatin immunoprecipitation assay that the E6 E-box motif binds to MyoD in vitro and in vivo. Furthermore, cotransfection experiments indicate that among the myogenic regulatory factors, MyoD preferentially up-regulates myostatin promoter activity. Since MyoD expression varies during the myoblast cell cycle, we analyzed the myostatin promoter activity in synchronized myoblasts and quiescent "reserve" cells. Our results suggest that myostatin promoter activity is relatively higher during the G1 phase of the cell cycle, when MyoD expression levels are maximal. However, in the reserve cells, which lack MyoD expression, a significant reduction in the myostatin promoter activity is observed. Taken together, these results suggest that the myostatin gene is a downstream target gene of MyoD. Since the myostatin gene is implicated in controlling G1-to-S progression of myoblasts, MyoD could be triggering myoblast withdrawal from the cell cycle by regulating myostatin gene expression.

* Corresponding author. Mailing address: Animal Genomics, AgResearch, East St., Hamilton, New Zealand. Phone: 0064 7 838 5591. Fax: 0064 7 838 5536. E-mail: Mridula.Sharma{at}AgResearch.co.nz.

{dagger} Present address: Division of Exercise Physiology, School of Medicine, West Virginia University, Morgantown, W.Va.

Molecular and Cellular Biology, October 2002, p. 7066-7082, Vol. 22, No. 20
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.20.7066-7082.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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