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- W3040184489 abstract "Abstract In synthetic circuits, CRISPR-Cas systems have been used effectively for endpoint changes from an initial state to a final state, such as in logic gates. Here, we use deactivated Cas9 (dCas9) and deactivated Cas12a (dCas12a) to construct dynamic RNA ring oscillators that cycle continuously between states over time in bacterial cells. While our dCas9 circuits using 103-nt guide RNAs showed irregular fluctuations with a wide distribution of peak-to-peak period lengths averaging approximately nine generations, a dCas12a oscillator design with 40-nt CRISPR RNAs performed much better, having a strongly repressed off-state, distinct autocorrelation function peaks, and an average peak-to-peak period length of ∼7.5 generations. Along with free-running oscillator circuits, we measure repression response times in open-loop systems with inducible RNA steps to compare with oscillator period times. We track thousands of cells for 24+ h at the single-cell level using a microfluidic device. In creating a circuit with nearly translationally independent behavior, as the RNAs control each others’ transcription, we present the possibility for a synthetic oscillator generalizable across many organisms and readily linkable for transcriptional control." @default.
- W3040184489 created "2020-07-10" @default.
- W3040184489 creator A5002586572 @default.
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- W3040184489 date "2020-07-01" @default.
- W3040184489 modified "2023-10-15" @default.
- W3040184489 title "Toward a translationally independent RNA-based synthetic oscillator using deactivated CRISPR-Cas" @default.
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- W3040184489 doi "https://doi.org/10.1093/nar/gkaa557" @default.
- W3040184489 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7430638" @default.
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