Identification and Quantification of Three Genetically Modified Insect Resistant Cotton Lines Using Conventional and TaqMan Real-Time Polymerase Chain Reaction Methods

文献类型： 外文期刊

第一作者： Yang, LT

作者： Yang, LT;Pan, AH;Zhang, KW;Guo, JC;Yin, CS;Chen, JX;Huang, C;Zhang, DB

作者机构：

关键词： Genetically modified organisms(GMOs);insect resistant cotton;multiplex PCR;real-time PCR;CpTI gene;Cry1A(c)gene

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN：

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收录情况： SCI

摘要： As the genetically modified organisms(GMOs)labeling policies are issued in many countries,qualitative and quantitative polymerase chain reaction(PCR)techniques are increasingly used for the detection of genetically modified(GM)crops in foods.Qualitative PCR and TaqMan real-time quantitative PCR methods to detect and identify three varieties of insect resistant cotton,i.e.,Mon531 cotton(Monsanto Co.)and GK19 and SGK321 cottons(Chinese Academy of Agricultural Sciences),which were approved for commercialization in China,were developed in this paper.Primer pairs specific to inserted DNAs,such as Cowpea trypsin inhibitor(CpTI)gene of SGK321 cotton and the specific junction DNA sequences containing partial Cry1A(c)gene and NOS terminator of Mon531,GK19,and SGK321 cotton varieties were designed to conduct the identified PCR assays.In conventional specific identified PCR assays,the limit of detection(LOD)was 0.05% for Mon531,GK19,or SGK321 in 100 ng of cotton genomic DNA for one reaction.Also,the multiplex PCR method for screening the three GM cottons was also established,which could save time and cost in practical detection.Furthermore,a real-time quantitative PCR assay based on TaqMan chemistry for detection of insect resistant gene,Cry1A(c),was developed.This assay also featured the use of a standard plasmid as a reference molecule,which contained both a specific region of the transgene Cry1A(c)and an endogenous stearoyl-acyl carrier protein desaturase(Sad1)gene of the cotton.In quantitative PCR assay,the quantification range was from 0.01 to 100% in 100 ng of the genome DNA template,and in the detection of 1.0,3.0,and 5.0% levels of three insect resistant cotton lines,respectively,all of the relative standard deviations(RSDs)were less than 8.2% except for the GM cotton samples with 1.0% Mon531 or GK19,which meant that our real-time PCR assays involving the use of reference molecule were reliable and practical for GM insect resistant cottons quantification.All of these results indicated that our established conventional and TaqMan real-time PCR assays were applicable to detect the three insect resistant cottons qualitatively and quantitatively.

分类号： S13

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