Detection of PAX3-FKHR and PAX7-FKHR fusion transcripts in rhabdomyosarcoma by reverse transcriptase-polymerase chain reaction using paraffin-embedded tissue

Be Fong Chen, Mong Liang Chen, Der Cherng Liang, Yu Wen Huang, Hsi Che Liu, Shu Huey Chen

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8 Citations (Scopus)

Abstract

Background. Alveolar rhabdomyosarcoma (RMS) is associated with a characteristic chromosomal translocation t(2;13)(q35;q14). The genes involved in this translocation are paired box (PAX)3 on chromosome 2 and forkhead in RMS (FKHR) on chromosome 13. An occasional variant translocation t(1;13)(p36;q14) affecting PAX7 and FKHR on chromosomes 1 and 13, respectively, has also been described. Chromosomal translocations in RMS are detected using conventional cytogenetic analysis, fluorescence in situ hybridization (FISH) or reverse transcriptase-polymerase chain reaction (RT- PCR) on fresh or frozen tissue samples. We describe the results of RT-PCR analysis of PAX3-FKHR and PAX7-FKHR chimeric messages in formalin-fixed, paraffin-embedded tissue samples from 17 RMS cases. Methods. RNA was extracted from formalin-fixed, paraffin-embedded RMS tissue. Oligonucleotide primers corresponding to the regions of PAX3, PAX7 and FKHR were used for the detection of PAX3-FKHR and PAX7-FKHR chimeric messages. A seminested PCR of the PCR products was used to increase the sensitivity of detection. The amplified fragments were purified and directly sequenced to confirm the specificity of the methods. Results. The PAX3-FKHR chimeric message was detected in all three cases of alveolar RMS but not in any of the 12 embryonal and two pleomorphic RMS cases. The PAX7-FKHR fusion transcript was detected in one case of embryonal RMS. Conclusions. The results indicate that the RT-PCR assay is a reliable method for the detection of the PAX3-FKHR fusion transcript of alveolar RMS in formalin-fixed, paraffin-embedded tissue. This simple method enables pathologists to identify chromosomal rearrangements in RMS as a diagnostic aid in cases where fresh or frozen tissue is not available.

Original languageEnglish
Pages (from-to)86-91
Number of pages6
JournalChinese Medical Journal (Taipei)
Volume62
Issue number2
Publication statusPublished - Feb 1999
Externally publishedYes

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Keywords

  • Alveolar rhabdomyosarcoma
  • FKHR gene
  • Formalin-fixed paraffin-embedded tissue
  • PAX3 gene
  • PAX7 gene
  • Reverse transcriptase-polymerase chain reaction

ASJC Scopus subject areas

  • Medicine(all)

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