Development of a CTAB buffer-based automated gDNA extraction method for the surveillance of GMO in seed
Seed imported into the EU from countries growing genetically modified (gm) plants may contain traces of these gm crops. As a result of the zero tolerance policy of the EU, these products must be removed from the market. Along with the amount of biotech crops produced worldwide, the work load for seed surveillance authorities increases. Since the commonly used CTAB buffer-based extraction methods are manual and laborious, a large part of the work load is caused by DNA extraction. In order to reduce labour input and accelerate the DNA analysis workflow, we developed an automated CTAB buffer-based DNA isolation method for seed. Several isolation and chemistry parameters were altered to combine a thorough cell lysis, removal of inhibitors and a highly efficient binding of gDNA to paramagnetic beads. This optimised procedure was compared with manual CTAB buffer-based and Wizard-based DNA extraction methods for maize, soya bean and rapeseed. Automated DNA extraction was faster, less laborious and resulted, on average, in higher DNA yield and purity. The applicability of our method was successfully proven with in-house routine samples.
KeywordsAutomated nucleic acid extraction Maxwell 16 CTAB Genetically modified plants GMO Seed Quantitative real-time PCR
The authors would like to thank Ingo Engels for his preliminary work. Promega GmbH is particularly acknowledged for providing Maxwell® 16 AS1290 kits.
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