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Journal of Biomedicine and Biotechnology
Volume 2005 (2005), Issue 3, Pages 248-253
Research article

Determination of Cytochrome P450 2D6 (CYP2D6) Gene Copy Number by Real-Time Quantitative PCR

1INSERM UMRS 490, Université René Descartes - Paris 5, 45 rue des Saints-Péres, Paris 75270, France
2Assistance Publique des Hôpitaux de Paris, Départment de la Biochemie, Hôpital Européen Georges Pompidou, Paris, France

Received 23 November 2004; Revised 17 March 2005; Accepted 21 March 2005

Copyright © 2005 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Gene dosage by real-time quantitative PCR has proved to be accurate for measuring gene copy number. The aim of this study was to apply this approach to the CYP2D6 gene to allow for rapid identification of poor and ultrarapid metabolizers (0, 1, or more than 2 gene copy number). Using the 2ΔΔCt calculation method and a duplex reaction, the number of CYP2D6 gene copies was determined. Quantitative PCR was performed on 43 samples previously analyzed by Southern blotting and long PCR including 20 samples with a heterozygous deletion, 11 with normal copy number (2 copies), and 12 samples with duplicated genes. The average ratio ranged from 1.02 to 1.28, 1.85 to 2.21, and 2.55 to 3.30, respectively, for the samples with 1 copy, 2 copies, and 3 copies. This study shows that this method is sensitive enough to detect either a heterozygous gene deletion or duplication.