Peel-1 negative selection promotes screening-free CRISPR-Cas9 genome editing in Caenorhabditis elegans
PLOS ONE(2020)
Abstract
Improved genome engineering methods that enable automation of large and precise edits are essential for systematic investigations of genome function. We adaptedpeel-1negative selection to an optimized Dual-Marker Selection (DMS) cassette protocol for CRISPR-Cas9 genome engineering inCaenorhabditis elegansand observed robust increases in multiple measures of efficiency that were consistent across injectors and four genomic loci. The use of Peel-1-DMS selection killed animals harboring transgenes as extrachromosomal arrays and spared genome-edited integrants, often circumventing the need for visual screening to identify genome-edited animals. To demonstrate the applicability of the approach, we created deletion alleles in the putative proteasomal subunitpbs-1and the uncharacterized geneK04F10.3and used machine vision to automatically characterize their phenotypic profiles, revealing homozygous essential and heterozygous behavioral phenotypes. These results provide a robust and scalable approach to rapidly generate and phenotype genome-edited animals without the need for screening or scoring by eye.
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