CRISPRi repression with dCas9-repressor fusion constructs.

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CRISPRi repression with dCas9-repressor fusion constructs. CRISPRi repression with dCas9-repressor fusion constructs. (a) dCas9 fusion constructs for CRISPRi repression. The diagram depicts the three dCas9 constructs (dCas9, dCas9-Mig1, and dCas9-Mxi1) engineered for CRISPRi repression in C. albicans. sgRNAs 1, 2, and 4 are on the sense strand; sgRNA 3 is antisense. RNAP, RNA polymerase. (b) dCas9-Mxi1 enhances repression from the ADE2 locus. C. albicans strains were generated, with each containing a dCas9 plasmid (dCas9, dCas9-Mig1, or dCas9-Mxi1), each with the same sgRNA targeting ADE2. To determine the extent of ADE2 repression, growth was monitored by serial dilution spotting assays on SD media with or without supplemented adenine. While dCas9 and dCas9-Mig1 showed reduced growth on SD without adenine medium, dCas9-Mxi1 showed further growth reduction, suggesting that this construct most effectively repressed ADE2 expression. (c) Growth curves confirming dCas9-based repression from the ADE2 locus. Wild-type, dCas9, and dCas9-Mxi1 C. albicans strains were grown in liquid SD media with or without supplemented adenine, and growth kinetics were monitored over ∼18 h. Both CRISPRi strains showed reduced growth in the absence of adenine, and the dCas9-Mxi1 strains showed further growth reduction. (d) qRT-PCR confirmed the reduced ADE2 transcript levels. To validate the transcriptional repression via CRISPRi, qRT-PCR was performed on wild-type, dCas9, and dCas-Mxi1 strains. ADE2 transcripts were monitored and normalized to an ACT1 transcript as a housekeeping gene. Data were plotted as fold repression of ADE2 relative to the wild-type control strain. Error bars depict standard errors of the means (SEM). Lauren Wensing et al. mSphere 2019; doi:10.1128/mSphere.00002-19