title: Endpoint visual detection of three genetically modified rice events by loop-mediated isothermal amplification.
abstract: Genetically modified (GM) rice KMD1, TT51-1, and KF6 are three of the most well known transgenic Bt rice lines in China. A rapid and sensitive molecular assay for risk assessment of GM rice is needed. Polymerase chain reaction (PCR), currently the most common method for detecting genetically modified organisms, requires temperature cycling and relatively complex procedures. Here we developed a visual and rapid loop-mediated isothermal amplification (LAMP) method to amplify three GM rice event-specific junction sequences. Target DNA was amplified and visualized by two indicators (SYBR green or hydroxy naphthol blue [HNB]) within 60 min at an isothermal temperature of 63 °C. Different kinds of plants were selected to ensure the specificity of detection and the results of the non-target samples were negative, indicating that the primer sets for the three GM rice varieties had good levels of specificity. The sensitivity of LAMP, with detection limits at low concentration levels (0.01%−0.005% GM), was 10- to 100-fold greater than that of conventional PCR. Additionally, the LAMP assay coupled with an indicator (SYBR green or HNB) facilitated analysis. These findings revealed that the rapid detection method was suitable as a simple field-based test to determine the status of GM crops.
authors.affiliation: Institute of Agriculture Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China. njjfxu@yahoo.com.cn.
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Chen
authors.forename: Xiaofu
authors.initials: X
authors.lastname: Wang
authors.forename: Nuo
authors.initials: N
authors.lastname: Jin
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhou
authors.forename: Sainan
authors.initials: S
authors.lastname: Huang
authors.forename: Qingmei
authors.initials: Q
authors.lastname: Miao
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhu
authors.forename: Junfeng
authors.initials: J
authors.lastname: Xu
mesh_terms: D017343:Genes, Plant; D021141:Nucleic Acid Amplification Techniques; D012275:Oryza / Q000235:genetics*; D010641:Phenotype; D030821:Plants, Genetically Modified; D012680:Sensitivity and Specificity