Abstract
Marker gene elimination was investigated in hybrid aspen (Populus tremula L. × Populus tremuloides Michx.) using the FLP/FRT recombination system. The construct contained the FLP recombinase under control of a heat inducible promoter, the antibiotic resistance gene nptII driven by the CaMV 35S promoter, and a promoterless uidA gene. The construct was integrated into poplar via Agrobacterium-mediated transformation. The active FLP recombinase excised the nptII marker gene and combined the promoterless uidA gene with the CaMV 35S promoter to form an active uidA gene. For targeted transgene integration, two constructs were used. The first one carried FLP under control of the heat-inducible Gmhsp17.5-E promoter from soybean as well as an active nptII gene flanked by two FRT sites; the second contained the promoterless bar selection marker gene also flanked by two FRT sites. Following transformation and induction of FLP, the enzyme mediated a site-specific recombination at the FRT sites of both constructs. This recombination leads to an excision of the FLP and nptII gene from the first as well as an excision of the promoterless bar gene from the second construct. The promoterless bar gene reintegrated exactly at the former position of the FLP and nptII genes in the first construct to form an active bar gene. The FLP/FRT recombination system from yeast forms a promising basis for the production of antibiotic-free transgenic plants and a useful tool for directed integration of transgenes into plant genomes.
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This research was funded by the Bundesministerium für Bildung und Forschung, Germany (Projektnummer PTJ-Bio/0313264T).
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Communicated by R. Sederoff
Matthias Fladung and Tobias M. H. Schenk contributed equally to this work.
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Fladung, M., Schenk, T.M.H., Polak, O. et al. Elimination of marker genes and targeted integration via FLP/FRT recombination system from yeast in hybrid aspen (Populus tremula L. × P. tremuloides Michx.). Tree Genetics & Genomes 6, 205–217 (2010). https://doi.org/10.1007/s11295-009-0241-x
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DOI: https://doi.org/10.1007/s11295-009-0241-x