title: Applicability of the chymopapain gene used as endogenous reference gene for transgenic huanong no. 1 papaya detection.
abstract: The virus-resistant papaya (Carica papaya L.), Huanong no. 1, was the genetically modified (GM) fruit approved for growing in China in 2006. To implement the labeling regulation of GM papaya and its derivates, the development of papaya endogenous reference gene is very necessary for GM papaya detection. Herein, we reported one papaya specific gene, Chymopapain (CHY), as one suitable endogenous reference gene, used for GM papaya identification. Thereafter, we established the conventional and real-time quantitative PCR assays of the CHY gene. In the CHY conventional PCR assay, the limit of detection (LOD) was 25 copies of haploid papaya genome. In the CHY real-time quantitative PCR assay, both the LOD and the limit of quantification (LOQ) were as low as 12.5 copies of haploid papaya genome. Furthermore, we revealed the construct-specific sequence of Chinese GM papaya Huanong no. 1 and developed its conventional and quantitative PCR systems employing the CHY gene as endogenous reference gene. This work is useful for papaya specific identification and GM papaya detection.
authors.affiliation: GMO Detection Laboratory, SJTU-Bor Luh Food Safety Center, School of Life Science and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Jinchao
authors.initials: J
authors.lastname: Guo
authors.forename: Litao
authors.initials: L
authors.lastname: Yang
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: Haibo
authors.initials: H
authors.lastname: Zhang
authors.forename: Bingjun
authors.initials: B
authors.lastname: Qian
authors.forename: Dabing
authors.initials: D
authors.lastname: Zhang
mesh_terms: D001483:Base Sequence; D029441:Carica / Q000235:genetics*; D002917:Chymopapain / Q000235:genetics*; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000235:genetics*; D030821:Plants, Genetically Modified / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000379:methods / Q000592:standards*; D012015:Reference Standards
chemical_list: D010940:Plant Proteins; D002917:Chymopapain