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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter / Tate, Jillian R.

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Volume 38, Issue 2 (Feb 2000)


Evaluation of RNA Isolation Methods and Reference Genes for RT-PCR Analyses of Rare Target RNA

Christine Mannhalter / Daniela Koizar / Gerlinde Mitterbauer
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2000.026


Reverse transcription polymerase chain reaction (RTPCR) analysis is increasingly becoming part of the diagnostic and prognostic evaluation for hematologic and oncologic disorders. Currently, different RNA isolation methods are used in the diagnostic laboratories. No data are available on their suitability for sensitive detection of breakpoint cluster region-abelson (BCR-ABL) gene transcripts. We have extracted RNA from mononuclear cell (MNC) fractions and from lysed blood samples of 4 patients (1 with leukocytosis, 1 with chronic myelogeneous leukemia (CML) under interferon treatment, and 2 CML patients after bone marrow transplantation) with 3 RNA isolation reagents (TRIzol™, RNAzol™, FastTube™ reagent). RNA yield was slightly higher with RNAzol™ than with TRIzol™ as indicated by agarose gel electrophoresis and spectrophotometric measurement at 260 nm. The FastTube™ reagent was unsuitable for RNA isolation from MNC, and was not evaluated for lysed blood. Quantitative competitive RT-PCR amplification of the ABL gene showed comparable results for RNA isolated with RNAzol™ and TRIzol™. In RNA samples extracted from lysed whole blood, the presence of amplifiable RNA/cDNA was confirmed by amplification of 4 selected reference genes (porphobilinogen deaminase (PBGD), ABL, the gene spanning the BCR on chromosome 22 and retinoic acid receptor alpha (RARA)) in a multiplex PCR. High quality, DNA-free RNA was obtained with RNAzol™, and 1 BCR-ABL-positive (specific for translocation t [9; 22]) cell among 2×104 normal cells was successfully detectable by single step RT-PCR. In RNA isolated with TRIzol™, major contaminations with genomic DNA were observed which significantly impaired the interpretation of the results of RT-PCR analysis.

About the article

Published Online: 2005-06-01

Published in Print: 2000-02-05

Citation Information: Clinical Chemistry and Laboratory Medicine, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2000.026. Export Citation

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