Sensitivity of a real-time PCR method for the detection of transgenes in a mixture of transgenic and non-transgenic seeds of papaya (Carica papayaL.)
| Autor: | Sujata Agarwal, Mariah Taylor Patton, Madhugiri Nageswara-Rao, Jordan A Skeen, C. Neal Stewart, Joshua S. Yuan, Charles Kwit, Richard M. Manshardt |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Gene Flow
DNA Plant Transgene Genetically-engineered Genetically modified crops Real-Time Polymerase Chain Reaction Sensitivity and Specificity law.invention chemistry.chemical_compound Virus resistance law Papain Transgenes Quantitative polymerase chain reaction (qPCR) Gene Polymerase chain reaction DNA Primers Plant Diseases biology Carica Reproducibility of Results Coat protein (CP) Plants Genetically Modified biology.organism_classification Molecular biology Horticulture Real-time polymerase chain reaction chemistry Fruit Seeds Linear Models Genetic Engineering DNA Research Article Biotechnology |
| Zdroj: | BMC Biotechnology |
| ISSN: | 1472-6750 |
| DOI: | 10.1186/1472-6750-13-69 |
| Popis: | Background Genetically engineered (GE) ringspot virus-resistant papaya cultivars ‘Rainbow’ and ‘SunUp’ have been grown in Hawai’i for over 10 years. In Hawai’i, the introduction of GE papayas into regions where non-GE cultivars are grown and where feral non-GE papayas exist have been accompanied with concerns associated with transgene flow. Of particular concern is the possibility of transgenic seeds being found in non-GE papaya fruits via cross-pollination. Development of high-throughput methods to reliably detect the adventitious presence of such transgenic material would benefit both the scientific and regulatory communities. Results We assessed the accuracy of using conventional qualitative polymerase chain reaction (PCR) as well as real-time PCR-based assays to quantify the presence of transgenic DNA from bulk samples of non-GE papaya seeds. In this study, an optimized method of extracting high quality DNA from dry seeds of papaya was standardized. A reliable, sensitive real-time PCR method for detecting and quantifying viral coat protein (cp) transgenes in bulk seed samples utilizing the endogenous papain gene is presented. Quantification range was from 0.01 to 100 ng/μl of GE-papaya DNA template with a detection limit as low as 0.01% (10 pg). To test this system, we simulated transgene flow using known quantities of GE and non-GE DNA and determined that 0.038% (38 pg) GE papaya DNA could be detected using real-time PCR. We also validated this system by extracting DNA from known ratios of GE seeds to non-GE seeds of papaya followed by real-time PCR detection and observed a reliable detection limit of 0.4%. Conclusions This method for the quick and sensitive detection of transgenes in bulked papaya seed lots using conventional as well as real-time PCR-based methods will benefit numerous stakeholders. In particular, this method could be utilized to screen selected fruits from maternal non-GE papaya trees in Hawai’i for the presence of transgenic seed at typical regulatory threshold levels. Incorporation of subtle differences in primers and probes for variations in cp worldwide should allow this method to be utilized elsewhere when and if deregulation of transgenic papaya occurs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink