Normal and rearranged PAX3 expression in human rhabdomyosarcoma

Cancer Genetics and Cytogenetics
E FrascellaAngelo Rosolen

Abstract

PAX3, a member of the PAX-gene family, encodes a nuclear transcription factor that is transiently expressed in the neural tube and in muscle progenitor cells and regulates embryonal development in the mouse. Together with the FKHR gene it is involved in the t(2;13)(q35;q14), a specific translocation associated with alveolar rhabdomyosarcoma (ARMS). As a consequence of the rearrangement two chimeric transcripts originate: FKHR-PAX3 and PAX3-FKHR. We studied the expression of wild type PAX3 and the chimeric transcripts originating from the t(2;13) in a series of 23 rhabdomyosarcomas (RMS) of childhood, by reverse transcriptase polymerase chain reaction (RT-PCR). Wild type PAX3 was detected in 48% of the RMS, whereas another 39% were positive only after nested PCR. Normal adult-skeletal muscle showed a very weak expression of PAX3, but fetal muscle did not express PAX3. PAX3-FKHR was found in 11 of 15 alveolar RMS, 7 of which were positive also for the reciprocal transcript, whereas no RMS expressed FKHR-PAX3 alone. These results confirm that the PAX3-FKHR transcript is specifically associated with the alveolar RMS and that it is a more sensitive marker of the t(2;13) than the reciprocal product FKHR-PAX3. Furthermore, the finding...Continue Reading

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