Abstract
In this chapter we present an alternative method to develop marker-free transgenic plants. It makes use of the Cre/loxP recombination system from bacteriophage P1 and consists of two essential components. The first component is the transgenic plant containing a loxP-flanked marker gene. The second component is a cre transient expression vector based on potato virus X. The great benefit of this transient delivery method consists in the avoidance of stable integration of the cre recombinase gene into the plant genome. Upon infection of the loxP-target plant with PVX-Cre, the virus spreads systemically through the plant and causes the recombinase-mediated excision of the marker gene. Marker-free transgenic loci can be transmitted to the progeny by plant regeneration from PVX-Cre systemically infected leaves or self-pollination of virus-infected plants. The protocol covers generation of loxP-target transgenic plants, PVX-mediated delivery of Cre recombinase protein, phenotypic and molecular analysis of recombination events, and transmission of marker-free transgenic loci to the next generation. The transient expression system described in this chapter can be adapted for marker gene removal in other plant species that are amenable for virus infection.
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Acknowledgments
The development of protocols described in this article was supported by grants from BMBF, 0312627 E and 0313264Q.
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Kopertekh, L., Schiemann, J. (2017). Marker Removal in Transgenic Plants Using Cre Recombinase Delivered with Potato Virus X. In: Eroshenko, N. (eds) Site-Specific Recombinases. Methods in Molecular Biology, vol 1642. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7169-5_10
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DOI: https://doi.org/10.1007/978-1-4939-7169-5_10
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