title: Simplex and duplex polymerase chain reaction analysis of Herculex RW (59122) maize based on one reference molecule including separated fragments of 5' integration site and endogenous gene.
abstract: Reference molecules, as positive controls and calibrators, have been recently developed in genetically modified organism analysis as a potential substitute for reference materials derived from plant raw materials. In this study, a novel reference molecule p59122, including the revealed 5' integration sequence of maize Herculex RW (59122), was constructed that was suitable for simplex and duplex event-specific qualitative and quantitative PCR detections. The LOD values were 10 copies both for simplex and duplex qualitative PCR when p59122 was used as the calibrator. These values were comparable to those of using genomic DNA samples with 0.01 and 0.05%, approximately 5 and 25 hyploid genomic DNA copies, respectively. The absolute LOD and LOQ values were confirmed to be as low as 10 and 25 copies of p59122 DNA both in simplex and duplex quantitative systems. Furthermore, ideal quantification data with low bias, SD and RSD values were obtained from the practical samples analyses in simplex and duplex real-time PCR systems using the reference molecule p59122 as a calibrator. All these results suggested that the developed reference molecule p59122 and the qualitative and quantitative PCR detection methods are suitable for identification and quantification of GM maize 59122 and its derived products.
authors.affiliation: Shanghai Jiao Tong University, GMO Detection Laboratory, SJTU-Bor Luh Food Safety Center, School of Life Science and Biotechnology, 800 Dongchuan Rd, Shanghai 200240, People's Republic of China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.forename: Litao
authors.initials: L
authors.lastname: Yang
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Zhang
authors.forename: Shu
authors.initials: S
authors.lastname: Wang
authors.forename: Kailin
authors.initials: K
authors.lastname: Shen
authors.forename: Liangwen
authors.initials: L
authors.lastname: Pan
authors.forename: Dabing
authors.initials: D
authors.lastname: Zhang
mesh_terms: D001483:Base Sequence; D001665:Binding Sites; D002138:Calibration; D017931:DNA Primers / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D017343:Genes, Plant; D008957:Models, Genetic; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000378:metabolism; D030821:Plants, Genetically Modified; D016133:Polymerase Chain Reaction / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D003313:Zea mays / Q000235:genetics*
chemical_list: D017931:DNA Primers; D018744:DNA, Plant; D010940:Plant Proteins