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Precision design of stable genetic circuits carried in highly‐insulated E. coli genomic landing pads
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Precision design of stable genetic circuits carried in highly‐insulated E. coli genomic landing pads
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Journal Article
Precision design of stable genetic circuits carried in highly‐insulated E. coli genomic landing pads
2020
Overview
Genetic circuits have many applications, from guiding living therapeutics to ordering process in a bioreactor, but to be useful they have to be genetically stable and not hinder the host. Encoding circuits in the genome reduces burden, but this decreases performance and can interfere with native transcription. We have designed genomic landing pads in
Escherichia coli
at high‐expression sites, flanked by ultrastrong double terminators. DNA payloads >8 kb are targeted to the landing pads using phage integrases. One landing pad is dedicated to carrying a sensor array, and two are used to carry genetic circuits. NOT/NOR gates based on repressors are optimized for the genome and characterized in the landing pads. These data are used, in conjunction with design automation software (Cello 2.0), to design circuits that perform quantitatively as predicted. These circuits require fourfold less RNA polymerase than when carried on a plasmid and are stable for weeks in a
recA
+
strain without selection. This approach enables the design of synthetic regulatory networks to guide cells in environments or for applications where plasmid use is infeasible.
Synopsis
Ultra‐stable genetic circuits with customizable designs are encoded in the
Escherichia coli
genome by integrating genetic circuit design automation (Cello) with three highly insulated genetic landing pads on the high expression location of the genome.
A library of seventeen ultra‐strong double terminators is developed to insulate three landing pads from in and outgoing transcription readthrough.
Three insulated genome “landing pads” are constructed in the
Escherichia coli
genome where expression level is high.
Six orthogonal genetic gates are optimized for the expression in the genome.
A new NOR gate architecture is devised to enable sophisticated genetic circuits.
Graphical Abstract
Ultra‐stable genetic circuits with customizable designs are encoded in the
Escherichia coli
genome by integrating genetic circuit design automation (Cello) with three highly insulated genetic landing pads on the high expression location of the genome.
Publisher
Nature Publishing Group UK,EMBO Press,John Wiley and Sons Inc,Springer Nature
Subject
