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Molecular and Cellular Biology, October 1999, p. 7255-7263, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

zfh-1, the Drosophila Homologue of ZEB, Is a Transcriptional Repressor That Regulates Somatic Myogenesis

Antonio A. Postigo,1 Ellen Ward,2 James B. Skeath,2 and Douglas C. Dean1,*

Division of Molecular Oncology1 and Department of Genetics,2 Washington University School of Medicine, St. Louis, Missouri 63110

Received 13 April 1999/Returned for modification 25 May 1999/Accepted 15 June 1999

zfh-1 is a member of the zfh family of proteins, which all contain zinc finger and homeodomains. The roles and mechanisms of action of most family members are still unclear. However, we have shown previously that another member of the family, the vertebrate ZEB protein, is a transcriptional repressor that binds E box sequences and inhibits myotube formation in cell culture assays. zfh-1 is downregulated in Drosophila embryos prior to myogenesis. Embryos with zfh-1 loss-of-function mutation show alterations in the number and position of embryonic somatic muscles, suggesting that zfh-1 could have a regulatory role in myogenesis. However, nothing is known about the nature or mechanism of action of zfh-1. Here, we demonstrate that zfh-1 is a transcription factor that binds E box sequences and acts as an active transcriptional repressor. When zfh-1 expression was maintained in the embryo beyond its normal temporal pattern of downregulation, the differentiation of somatic but not visceral muscle was blocked. One potential target of zfh-1 in somatic myogenesis could be the myogenic factor mef2. mef2 is known to be regulated by the transcription factor twist, and we show here that zfh-1 binds to sites in the mef2 upstream regulatory region and inhibits twist transcriptional activation. Even though there is little sequence similarity in the repressor domains of ZEB and zfh-1, we present evidence that zfh-1 is the functional homologue of ZEB and that the role of these proteins in myogenesis is conserved from Drosophila to mammals.

* Corresponding author. Mailing address: Washington University School of Medicine, Division of Molecular Oncology, Campus Box 8069, 660 S. Euclid Ave., St. Louis, MO 63110. Phone: (314) 362-8989. Fax: (314) 747-2797. E-mail: ddean{at}im.wustl.edu.

Molecular and Cellular Biology, October 1999, p. 7255-7263, Vol. 19, No. 10
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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