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• W3124316984 abstract "Summary Genome editing by RNA-guided nucleases, such as Sp Cas9, has been used in numerous different plant species. However, to what extent multiple independent loci can be targeted simultaneously by multiplexing has not been well-documented. Here, we developed a toolkit, based on a highly intron-optimized zCas9i gene, which allows assembly of nuclease constructs expressing up to 32 sgRNAs. We used this toolkit to explore the limits of multiplexing in two major model species, and report on isolation of transgene-free octuple Nicotiana benthamiana and duodecuple (12x) Arabidopsis thaliana mutant lines in a single generation (T 1 and T 2 , respectively). We developed novel counter-selection markers for N. benthamiana , most importantly Sl -FAST2, comparable to the well-established Arabidopsis seed fluorescence marker, and FCY-UPP, based on production of toxic 5-fluorouracyl in presence of a precursor. Targeting eight genes with an array of nine different sgRNAs and relying on FCY-UPP for selection of non-transgenic T 1 , we identified N. benthamiana mutant lines with astonishingly high efficiencies: All analyzed plants carried mutations in all genes (~112/116 target sites edited). Furthermore, we targeted 12 genes by an array of 24 sgRNAs in A. thaliana . Efficiency was significantly lower in A. thaliana , and our results indicate Cas9 availability is the limiting factor in such higher order multiplexing applications. We identify a duodecuple mutant line by a combination of phenotypic screening and amplicon sequencing. The resources and results presented provide new perspectives for how multiplexing can be used to generate complex genotypes or to functionally interrogate groups of candidate genes." @default.
• W3124316984 created "2021-02-01" @default.
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• W3124316984 date "2020-04-01" @default.
• W3124316984 modified "2023-10-16" @default.
• W3124316984 title "Highly efficient multiplex editing: One-shot generation of 8x<i>Nicotiana benthamiana</i>and 12x Arabidopsis mutants" @default.
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• W3124316984 doi "https://doi.org/10.1101/2020.03.31.018671" @default.
• W3124316984 hasPublicationYear "2020" @default.
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