Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6494485 | Metabolic Engineering | 2015 | 39 Pages |
Abstract
CRISPR/Cas9 is a simple and efficient tool for targeted and marker-free genome engineering. Here, we report the development and successful application of a multiplex CRISPR/Cas9 system for genome engineering of up to 5 different genomic loci in one transformation step in baker's yeast Saccharomyces cerevisiae. To assess the specificity of the tool we employed genome re-sequencing to screen for off-target sites in all single knock-out strains targeted by different gRNAs. This extensive analysis identified no more genome variants in CRISPR/Cas9 engineered strains compared to wild-type reference strains. We applied our genome engineering tool for an exploratory analysis of all possible single, double, triple, quadruple and quintuple gene disruption combinations to search for strains with high mevalonate production, a key intermediate for the industrially important isoprenoid biosynthesis pathway. Even though we did not overexpress any genes in the mevalonate pathway, this analysis identified strains with mevalonate titers greater than 41-fold compared to the wild-type strain. Our findings illustrate the applicability of this highly specific and efficient multiplex genome engineering approach to accelerate functional genomics and metabolic engineering efforts.
Keywords
gRNAROX1UASPAMDSBMevalonateORFCRISPRCRISPR/Cas9squalene synthaseclustered regularly interspaced short palindromic repeatupstream activating sequenceguide RNATranscription activator-like effector nucleaseTALENdouble strand breakopen reading frameYeastprotospacer adjacent motifgeranylgeranyl pyrophosphate synthase
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Bioengineering
Authors
Tadas JakoÄiÅ«nas, Ida Bonde, Markus HerrgÃ¥rd, Scott J. Harrison, Mette Kristensen, Lasse E. Pedersen, Michael K. Jensen, Jay D. Keasling,