A trait stacking system via intra-genomic homologous recombination.
A gene targeting method has been developed, which allows the conversion of 'breeding stacks', containing unlinked transgenes into a 'molecular stack' and thereby circumventing the breeding challenges associated with transgene segregation. A gene targeting method has been developed for converting two unlinked trait loci into a single locus transgene stack. The method utilizes intra-genomic homologous recombination (IGHR) between stably integrated target and donor loci which share sequence homology and nuclease cleavage sites whereby the donor contains a promoterless herbicide resistance transgene. Upon crossing with a zinc finger nuclease (ZFN)-expressing plant, double-strand breaks (DSB) are created in both the stably integrated target and donor loci. DSBs flanking the donor locus result in intra-genomic mobilization of a promoterless selectable marker-containing donor sequence, which can be utilized as a template for homology-directed repair of a concomitant DSB at the target locus resulting in a functional selectable marker via nuclease-mediated cassette exchange (NMCE). The method was successfully demonstrated in maize using a glyphosate tolerance gene as a donor whereby up to 3.3 % of the resulting progeny embryos cultured on selection medium regenerated plants with the donor sequence integrated into the target locus. The process could be extended to multiple cycles of trait stacking by virtue of a unique intron sequence homology for NMCE between the target and the donor loci. This is the first report that describes NMCE via IGHR, thereby enabling trait stacking using conventional crossing.
Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN, 46268, USA. Skumar9@dow.com.
Sandeep
S
Kumar
Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN, 46268, USA.
Andrew
A
Worden
Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN, 46268, USA.
Stephen
S
Novak
Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN, 46268, USA.
Ryan
R
Lee
Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN, 46268, USA.|Biotechnology Department, Ivy Tech Community College, 9301 East 59th Street, Indianapolis, IN, 46216, USA.
Joseph F
JF
Petolino
D015139:Blotting, Southern; D003433:Crosses, Genetic; D018390:Gene Targeting; D023281:Genomics / Q000379:methods*; D005998:Glycine / Q000031:analogs & derivatives / Q000633:toxicity; D059765:Homologous Recombination / Q000235:genetics*; D030821:Plants, Genetically Modified; D016133:Polymerase Chain Reaction; D019655:Quantitative Trait, Heritable; D012038:Regeneration / Q000187:drug effects; D000097797:Glyphosate
D005998:Glycine; D000097797:Glyphosate
Gene targeting; Intra-genomic mobilization; Nuclease-mediated cassette exchange; Plants; Transgene stacking; Zinc finger nuclease
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