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Klinik für Innere Medizin m.S. Hämatologie und Onkologie, Charité-Campus Virchow Klinikum, Humboldt Universität, Augustenburger Platz 1, Forschungshaus 37 R 2.303, D-13353 Berlin, Germany.
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TIB Molbiol, D-10829 Berlin, Germany.
a Author for correspondence. Fax 49-30-45053929; e-mail andreas.nitsche{at}charite.de
Background: The aim of this study was to compare the ABI PRISM 7700 Sequence Detection System and the LightCycler to develop a quantitative real-time PCR assay for the detection of human cytomegalovirus (HCMV) DNA suitable for routine hospital application.
Methods: We used one exonuclease probe and five different hybridization probe sets as sequence-specific fluorescence detection formats. For the exonuclease assay and two hybridization probe sets, reproducibility and the detection limit were determined. To keep the total assay time to a minimum, we gradually shortened individual reaction steps on both instruments.
Results: The exonuclease assay can be interchangeably performed on the 7700 and the LightCycler. No change of reaction conditions is required, except for the addition of bovine serum albumin to the LightCycler reaction. The shortest possible total assay time is 80 min for the ABI PRISM 7700 Sequence Detection System and 20 min for the LightCycler. When the LightCycler is used, the exonuclease probe can be replaced by a set of hybridization probes. All assays presented here detected HCMV DNA in a linear range from 101 to 107 HCMV genome equivalents/assay (r >0.995) with low intraassay (<5%) and interassay (<10%) variation.
Conclusions: The ABI PRISM 7700 Sequence Detection System as well as the LightCycler are useful instruments for rapid and precise online PCR detection. Moreover, the two principles of fluorescence signal production allow HCMV quantification with the same accuracy.
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R. T. Hayden, J. R. Uhl, X. Qian, M. K. Hopkins, M. C. Aubry, A. H. Limper, R. V. Lloyd, and F. R. Cockerill Direct Detection of Legionella Species from Bronchoalveolar Lavage and Open Lung Biopsy Specimens: Comparison of LightCycler PCR, In Situ Hybridization, Direct Fluorescence Antigen Detection, and Culture J. Clin. Microbiol., July 1, 2001; 39(7): 2618 - 2626. [Abstract] [Full Text] [PDF]
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