title: International collaborative study of the endogenous reference gene, sucrose phosphate synthase (SPS), used for qualitative and quantitative analysis of genetically modified rice.
abstract: One rice ( Oryza sativa ) gene, sucrose phosphate synthase (SPS), has been proven to be a suitable endogenous reference gene for genetically modified (GM) rice detection in a previous study. Herein are the reported results of an international collaborative ring trial for validation of the SPS gene as an endogenous reference gene and its optimized qualitative and quantitative polymerase chain reaction (PCR) systems. A total of 12 genetically modified organism (GMO) detection laboratories from seven countries participated in the ring trial and returned their results. The validated results confirmed the species specificity of the method through testing 10 plant genomic DNAs, low heterogeneity, and a stable single-copy number of the rice SPS gene among 7 indica varieties and 5 japonica varieties. The SPS qualitative PCR assay was validated with a limit of detection (LOD) of 0.1%, which corresponded to about 230 copies of haploid rice genomic DNA, while the limit of quantification (LOQ) for the quantitative PCR system was about 23 copies of haploid rice genomic DNA, with acceptable PCR efficiency and linearity. Furthermore, the bias between the test and true values of eight blind samples ranged from 5.22 to 26.53%. Thus, we believe that the SPS gene is suitable for use as an endogenous reference gene for the identification and quantification of GM rice and its derivates.
authors.affiliation: GMO Detection Laboratory, Shanghai Jiao Tong University (SJTU)-Bor Luh Food Safety Center, School of Life Science and Biotechnology, SJTU, 800 Dongchuan Road, Shanghai 200240, People's Republic of China.
authors.forename: Lingxi
authors.initials: L
authors.lastname: Jiang
authors.forename: Litao
authors.initials: L
authors.lastname: Yang
authors.forename: Haibo
authors.initials: H
authors.lastname: Zhang
authors.forename: Jinchao
authors.initials: J
authors.lastname: Guo
authors.forename: Marco
authors.initials: M
authors.lastname: Mazzara
authors.forename: Guy
authors.initials: G
authors.lastname: Van den Eede
authors.forename: Dabing
authors.initials: D
authors.lastname: Zhang