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Molecular and Cellular Biology, October 2002, p. 7204-7216, Vol. 22, No. 20
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.20.7204-7216.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Pax3-FKHR Knock-In Mice Show Developmental Aberrations but Do Not Develop Tumors

Irina Lagutina,1 Simon J. Conway,2 Jack Sublett,3 and Gerard C. Grosveld1*

Department of Genetics,1 Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee 38105,3 Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, Georgia 309122

Received 6 February 2002/ Returned for modification 19 June 2002/ Accepted 2 July 2002

Alveolar rhabdomyosarcoma is a pediatric disease specified by the recurrent chromosome translocations t(2;13) and t(1;13). These translocations result in the formation of the PAX3-FKHR and PAX7-FKHR fusion genes, which are thought to play a causal role in the genesis of this disease. Although PAX3-FKHR exhibits transforming activity in immortalized fibroblast cell lines, a direct role of this fusion protein in tumorigenesis in vivo has not been shown. We determined whether expression of Pax3-FKHR in the mouse germ line would render these animals prone to the development of rhabdomyosarcomas. By targeting FKHR cDNA sequences into the Pax3 locus of embryonic stem cells, we used these cells to generate mice carrying a Pax3-FKHR knock-in allele. Despite low expression of the knock-in allele, heterozygous offspring of Pax3-FKHR chimeric mice showed developmental abnormalities. These included intraventricular septum defects, tricuspid valve insufficiency, and diaphragm defects, which caused congestive heart failure leading to perinatal death. In addition, Pax3-FKHR heterozygous offspring displayed malformations of some but not all hypaxial muscles. However, neither newborn heterozygous pups nor their chimeric parents showed any signs of malignancy. We conclude that the Pax3-FKHR allele causes lethal developmental defects in knock-in mice but might be insufficient to cause muscle tumors.

* Corresponding author. Mailing address: Department of Genetics, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105. Phone: (901) 495-2279. Fax: (901) 526-2907. E-mail: gerard.grosveld{at}stjude.org.

Molecular and Cellular Biology, October 2002, p. 7204-7216, Vol. 22, No. 20
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.20.7204-7216.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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