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Molecular Biology and Genetics |
Abteilung für Innere Medizin und Poliklinik m.S. Hä matologie und Onkologie, Campus Virchow-Klinikum, Medizinische Fakultät Charité der Humboldt-Universität zu Berlin, 13353 Berlin [K-A. K., U. L., A. B., C. A. S.]; and TIB Molbiol Inc., 10829 Berlin [O. L.], Germany
Quantifying bcr/abl fusion transcripts in chronic myelogenous leukemia is thought to serve as a powerful parameter for monitoring the kinetic nature of this clonal disease in vivo and in vitro. Recently, we demonstrated the technical advantages as well as the clinical relevance of quantitating bcr/abl fusion mRNA using the 5-nuclease assay and a real-time fluorescence reverse transcriptase-PCR (RT-PCR) detection system (ABI PRISM 7700 SDS). Meanwhile, another technique was introduced (LightCycler technology) that may be used for the same purpose. To investigate whether this method may be an appropriate alternative to the described procedure, we have established bcr/abl LightCycler RT-PCR for major and minor bcr/abl fusion transcripts. We found that, with only minor modifications, TaqMan RT-PCR and fluorescent probe design can be used to obtain comparable results in the LightCycler system. The developed method could quantitate as little as 10 bcr/abl copies per 100 ng cDNA and was as safe and reproducible as the previously described technique. Because reaction efficiency was identical within different bcr/abl major fusions, one single RT-PCR could be established that simultaneously detects b2a3, b2a2, b3a2, and b3a3 fusion RNA with equal specificity and sensitivity. Compared to results generated by the ABI PRISM 7700 SDS, absolute amounts of bcr/abl did not differ significantly, and there was a linear correlation between the respective values. We conclude that TaqMan chemistry can be used in the LightCycler and that both real-time fluorescence PCR detection systems equally fulfill the criteria for the safe and reliable quantitation of bcr/abl fusion RNA in clinical samples. This may be of help for further standardization of quantitative bcr/abl RT-PCR, which, again, is necessary for the comparison of results generated by different investigators.
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