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JMD 2004, Vol. 6, No. 4
Copyright © 2004 American Society for Investigative Pathology & Association for Molecular Pathology

Characterization of the Different BCR-ABL Transcripts with a Single Multiplex RT-PCR

Jacques Chasseriau*, Jérôme Rivet*, Frédéric Bilan*, Jean-Claude Chomel*, François Guilhot{dagger}, Nicolas Bourmeyster* and Alain Kitzis*

From the Laboratoire de Génétique Cellulaire et Moléculaire, * Oncologie Hématologique, {dagger} UPRES EA2622, Poitiers Cedex, France

The diagnosis of chronic myeloid leukemia is based on detection of the Philadelphia (Ph) chromosome or the BCR-ABL gene. The junction present in the transcript may vary according to the reciprocal translocation t(9;22)(q34;11). Identification of the transcript (p190, p210 or p230) does not reveal the type of junction but this information is very important for classification of patients in clinical trials. Most identification kits do not explore p230 transcripts and are unable to determine exotic breakpoints. We have developed a clinical molecular diagnosis assay, able to identify all of the BCR-ABL transcripts and, by single assay, to characterize all of the possible transcript junctions. This technique is based on RT-PCR and PCR-capillary electrophoresis. For each patient sample, we performed RT-PCR with three different BCR primers each coupled to a specific different fluorochrome and a unique reverse ABL primer. Depending on the transcript, only one BCR primer was used for each RT-PCR. After capillary electrophoresis and fluorescence determination, we were able to identify both the transcript and its junction at the same time.




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