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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Pax3:Fkhr interferes with embryonic Pax3 and Pax7 function: implications for alveolar rhabdomyosarcoma cell of origin.

To investigate the role of the translocation-associated gene Pax3:Fkhr in alveolar rhabdomyosarcomas, we generated a Cre-mediated conditional knock-in of Pax3:Fkhr into the mouse Pax3 locus. Exploring embryonic tumor cell origins, we replaced a Pax3 allele with Pax3:Fkhr throughout its expression domain, causing dominant-negative effects on Pax3 and paradoxical activation of the Pax3 target gene, c-Met. Ectopic neuroprogenitor cell proliferation also occurs. In contrast, activation later in embryogenesis in cells that express Pax7 results in viable animals with a postnatal growth defect and a moderately decreased Pax7+ muscle satellite cell pool, phenocopying Pax7 deficiency but remarkably not leading to tumors.[1]


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