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Molecular and Cellular Biology, May 2002, p. 3149-3156, Vol. 22, No. 9
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.9.3149-3156.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Transcription Factor Gene AP-2{gamma} Essential for Early Murine Development

Uwe Werling1,2 and Hubert Schorle2*

Forschungszentrum Karlsruhe, ITG, Institute for Toxicology and Genetics, 76344 Eggenstein-Leopoldshafen,1 Department of Developmental Pathology, Institute for Pathology, University of Bonn Medical School, 53127 Bonn, Germany2

Received 29 November 2001/ Returned for modification 14 January 2002/ Accepted 4 February 2002

Transcription factor gene AP-2{gamma} belongs to a family of four closely related genes. AP-2{gamma} had been implicated in multiple functions during proliferation and differentiation based on its expression pattern in trophoblast, neural crest, and ectoderm cells in murine embryos. In order to address the question of the role of AP-2{gamma} during mammalian development, we generated mice harboring a disrupted AP-2{gamma} allele. AP-2{gamma} heterozygous mice are viable and display reduced body sizes at birth but are fertile. Mice deficient for AP-2{gamma}, however, are growth retarded and die at days 7 to 9 of embryonic development. Immunohistochemical analysis revealed that the trophectodermal cells that are found to express AP-2{gamma} fail to proliferate, leading to failure of labyrinth layer formation. As a consequence, the developing embryo suffers from malnutrition and dies. Analysis of embryo cultures suggests that AP-2{gamma} is also implicated in the regulation of the adenosine deaminase (ADA) gene, a gene involved in purine metabolism found expressed at the maternal-fetal interface. Therefore, AP-2{gamma} seems to be required in early embryonic development because it regulates the genetic programs controlling proliferation and differentiation of extraembryonic trophectodermal cells.

* Corresponding author. Mailing address: Institute for Pathology, Department of Developmental Pathology, University of Bonn, Sigmund-Freud Strasse 25, 53127 Bonn, Germany. Phone: 49 228 287 6342. Fax: 49 228 287 5030. E-mail: Hubert.Schorle{at}ukb.uni-bonn.de.

Molecular and Cellular Biology, May 2002, p. 3149-3156, Vol. 22, No. 9
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.9.3149-3156.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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