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Prins, Theo W.; Scholtens, Ingrid M.J.; Bak, Arno W.; van Dijk, Jeroen P.; Voorhuijzen, Marleen M.; Laurensse, Emile J.; Kok, Esther J.
Food chemistry, 12/2016, Letnik: 213Journal Article
•Screening and identification of unknown GM papayas.•Sequence of PRSV coat protein predicts geographical origin.•EU unauthorised 16-0-1 and 18-2-4 papaya events detected in food supplements.•Event-specific TaqMan methods developed for 16-0-1 and 18-2-4 papaya. During routine monitoring for GMOs in food in the Netherlands, papaya-containing food supplements were found positive for the genetically modified (GM) elements P-35S and T-nos. The goal of this study was to identify the unknown and EU unauthorised GM papaya event(s). A screening strategy was applied using additional GM screening elements including a newly developed PRSV coat protein PCR. The detected PRSV coat protein PCR product was sequenced and the nucleotide sequence showed identity to PRSV YK strains indigenous to China and Taiwan. The GM events 16-0-1 and 18-2-4 could be identified by amplifying and sequencing events-specific sequences. Further analyses showed that both papaya event 16-0-1 and event 18-2-4 were transformed with the same construct. For use in routine analysis, derived TaqMan qPCR methods for events 16-0-1 and 18-2-4 were developed. Event 16-0-1 was detected in all samples tested whereas event 18-2-4 was detected in one sample. This study presents a strategy for combining information from different sources (literature, patent databases) and novel sequence data to identify unknown GM papaya events.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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