Construction of designer selectable marker deletions with a CRISPR-Cas9 toolbox in Schizosaccharomyces pombe and new design of common entry vectors

Yu Zhao, Jef D. Boeke

    Research output: Contribution to journalArticle

    Abstract

    Vectors encoding selectable markers have been widely used in yeast to maintain or express exogenous DNA fragments. In the fission yeast Schizosaccharomyces pombe, several engineered markers have been reported and widely used, such as ura4+ and ScLEU2 from Saccharomyces cerevisiae, which complement ura4 and leu1 mutations, respectively. These two auxotrophic markers share no homology with the S. pombe genome; however, most others can recombine with the genome due to sequence homology shared between the genomic and plasmid-borne copies of the markers. Here, we describe a CRISPR-Cas9 toolbox that can be used to quickly introduce "designer" auxotrophic marker deletions into host strains, including leu1-Δ0, his3-Δ0, and lys9-Δ0. Together with ura4-D18, this brings the total number of available designer deletion auxotrophic markers to four. The toolbox consists of a Cas9-gRNA expression vector and a donor DNA plasmid pair for each designer deletion. Using this toolbox, a set of auxotrophic S. pombe strains was constructed. Further, we reorganized essential components in the commonly used pREP series of plasmids and assembled the corresponding auxotrophic marker gene onto these plasmids. This toolbox for producing designer deletions, together with the newly developed strains and plasmids, will benefit the whole yeast community.

    Original languageEnglish (US)
    Pages (from-to)789-796
    Number of pages8
    JournalG3: Genes, Genomes, Genetics
    Volume8
    Issue number3
    DOIs
    StatePublished - Mar 1 2018

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    Keywords

    • CRISPR-Cas9 toolbox
    • Marker deletion Schizosaccharomyces
    • New plasmids
    • Pombe

    ASJC Scopus subject areas

    • Molecular Biology
    • Genetics
    • Genetics(clinical)

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