Technical report

Transgenic Research

, Volume 15, Issue 2, pp 261-265

Accurate Determination of Zygosity in Transgenic Rice by Real-time PCR Does Not Require Standard Curves or Efficiency Correction

  • Fiona A. PriorAffiliated withCentre for Biologics Research, Biologics and Genetic Therapies Directorate, Health Canada, Sir Frederick Banting Research Centre
  • , Eilleen S. TackaberryAffiliated withCentre for Biologics Research, Biologics and Genetic Therapies Directorate, Health Canada, Sir Frederick Banting Research CentreDepartment of Biochemistry, Microbiology and Immunology, University of Ottawa
  • , Rémy A. AubinAffiliated withCentre for Biologics Research, Biologics and Genetic Therapies Directorate, Health Canada, Sir Frederick Banting Research CentreDepartment of Biochemistry, Microbiology and Immunology, University of Ottawa
  • , William L. CasleyAffiliated withCentre for Biologics Research, Biologics and Genetic Therapies Directorate, Health Canada, Sir Frederick Banting Research CentreDepartment of Biology, University of Ottawa Email author 

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Abstract

A number of quantitative, real-time PCR methods have been developed for determining transgene copy numbers in plants. Here, we demonstrate that the Roche LightCyclerTM system can be used to determine the zygosity of transgenic lines without the use of standard curves or efficiency correction calculations. We have developed a duplex PCR assay which permits the determination of zygosity, relative to a calibrator sample, in transgenic rice lines containing the gene for a viral glycoprotein. Our data demonstrate that unambiguous 2-fold discrimination of copy number can be attained by calculating relative copy number using the threshold crossing point (Ct) calculated by the LightCyclerTM software combined with delta delta Ct calculations, provided that the appropriate calibrator sample is included in each run. The method presented here is rapid, sensitive, robust and easy to optimise.

Keywords

LightCyclerTM quantitative real-time PCR transgenic plants zygosity