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CRISPR/dCas9 Switch Systems for Temporal Transcriptional Control.
In a swift revolution, CRISPR/Cas9 has reshaped the means and ease of interrogating biological questions. Particularly, mutants that result in a nuclease-deactivated Cas9 (dCas9) provide scientists with tools to modulate transcription of genomic loci at will by targeting transcriptional effector domains. To interrogate the temporal order of events during transcriptional regulation, rapidly inducible CRISPR/dCas9 systems provide previously unmet molecular tools. In only a few years of time, numerous light and chemical-inducible switches have been applied to CRISPR/dCas9 to generate dCas9 switches. As these inducible switch systems are able to modulate dCas9 directly at the protein level, they rapidly affect dCas9 stability, activity, or target binding and subsequently rapidly influence downstream transcriptional events. Here we review the current state of such biotechnological CRISPR/dCas9 enhancements. Specifically we provide details on their flaws and strengths and on the differences in molecular design between the switch systems. With this we aim to provide a selection guide for researchers with keen interest in rapid temporal control over transcriptional modulation through the CRISPR/dCas9 system.
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