In this study, multiple displacement amplification (MDA) was used for transgene detection, and proved to effectively improve the sensitivity of most fluorescence polymerase chain (PCR). Five events of genetically modified plants were chosen for detection in different plant species by MDA and real-time PCRs. Individual primer/probe systems based on each transgene target were used. The extracted DNA of each sample was diluted and used as a template for MDA. All extracted DNA and diluted mdaDNA were detected by real-time PCR. The results were evaluated with respect to DNA quantity, DNA purity and difference of Ct values of the isogenetic DNA extract before and after MDA (D-values). The MDA amplifying effects were largely different among genes and plants. Organelle DNA has more copies than genomic DNA by MDA.
Key words: Multiple displacement amplification, genetically modified organisms, detection, events.
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