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[SANET-MG] plant gene for antibiotic resistance



The use of a plant gene conferring antibiotic resistance as a selectable marker is being promoted as a safe alternative for genetic engineering in plants. However, the antibiotic resistance of the plant gene in bacteria and in fungi does not seem to have been explored. The gene is presumed to be inactive in bacteria or fungi and that seems to be enough for the promoters of GM crops.
Nature Biotechnology
Published online: 21 August 2005; | doi:10.1038/nbt1134
Overexpression of an Arabidopsis thaliana ABC transporter confers kanamycin resistance to transgenic plants
Ayalew Mentewab & C Neal Stewart Jr

Selectable markers of bacterial origin such as the neomycin phosphotransferase type II gene, which can confer kanamycin resistance to transgenic plants, represent an invaluable tool for plant engineering. However, since all currently used antibiotic-resistance genes are of bacterial origin, there have been concerns about horizontal gene transfer from transgenic plants back to bacteria, which may result in antibiotic resistance. Here we characterize a plant gene, Atwbc19, the gene that encodes an Arabidopsis thaliana ATP binding cassette (ABC) transporter and confers antibiotic resistance to transgenic plants. The mechanism of resistance is novel, and the levels of resistance achieved are comparable to those attained through expression of bacterial antibiotic-resistance genes in transgenic tobacco using the CaMV 35S promoter. Because ABC transporters are endogenous to plants, the use of Atwbc19 as a selectable marker in transgenic plants may provide a practical alternative to current bacterial marker genes in terms of the risk for horizontal transfer of resistance genes.



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