Toward Metrological Traceability for DNA Fragment Ratios in GM Quantification. 1. Effect of DNA Extraction Methods on the Quantitative Determination of Bt176 Corn by Real-Time PCR
Authors:
- Philippe CorbisierPCPhilippe Corbisier
- Wim BroothaertsWBWim Broothaerts
- Sabrina GioriaSGSabrina Gioria
- Heinz SchimmelHSHeinz Schimmel
- Malcolm BurnsMBMalcolm Burns
- Anna BaoutinaABAnna Baoutina
- Kerry R. EmslieKEKerry R. Emslie
- Satoshi FuruiSFSatoshi Furui
- Yasunori KurosawaYKYasunori Kurosawa
- Marcia J. HoldenMHMarcia J. Holden
- Hyong-Ha KimHKHyong-Ha Kim
- Yun-Mi LeeYLYun-Mi Lee
- 4 April 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Agricultural and Food Chemistry
- Vol. 55 (9) , 3249-3257
Abstract
An international CCQM-P60 pilot study involving eight national metrological institutes was organized to investigate if the quantification of genetically modified (GM) corn powder by real-time PCR was affected by the DNA extraction method applied. Four commonly used extraction methods were compared for the extraction of DNA from a GM Bt176 corn powder. The CTAB-based method yielded the highest DNA template quantity and quality. A difference in the 260 nm/230 nm absorbance ratio was observed among the different extraction methods. Real-time amplification of sequences specific for endogenous genes zein and hmg as well as transgenic sequences within the cryIA(b) gene and a fragment covering the junction between the transformed DNA and the plant genome were used to determine the GM percentage. The detection of the transgenic gene was affected by the quantity and quality of template used for the PCR reaction. The Bt176 percentages measured on diluted or purified templates were statistically different depending on the extraction method applied. Keywords: Feed; food; genetically modified organism; GM; measurement uncertainty; extraction method; DNA; PCRKeywords
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