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Simultaneous repression of multiple bacterial genes using nonrepetitive extra-long sgRNA arrays

Journal Article · · Nature Biotechnology
Engineering cellular phenotypes often requires the regulation of many genes. When using CRISPR interference, coexpressing many single-guide RNAs (sgRNAs) triggers genetic instability and phenotype loss, due to the presence of repetitive DNA sequences. We stably coexpressed 22 sgRNAs within nonrepetitive extra-long sgRNA arrays (ELSAs) to simultaneously repress up to 13 genes by up to 3,500-fold. We applied biophysical modeling, biochemical characterization and machine learning to develop toolboxes of nonrepetitive genetic parts, including 28 sgRNA handles that bind Cas9. We designed ELSAs by combining nonrepetitive genetic parts according to algorithmic rules quantifying DNA synthesis complexity, sgRNA expression, sgRNA targeting and genetic stability. Using ELSAs, we created three highly selective phenotypes in Escherichia coli, including redirecting metabolism to increase succinic acid production by 150-fold, knocking down amino acid biosynthesis to create a multi-auxotrophic strain and repressing stress responses to reduce persister cell formation by 21-fold. Finally, ELSAs enable simultaneous and stable regulation of many genes for metabolic engineering and synthetic biology applications.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
Defense Advanced Research Projects Agency (DARPA); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23). Biological Systems Science Division
Grant/Contract Number:
SC0019090
OSTI ID:
1569832
Alternate ID(s):
OSTI ID: 1593337
Journal Information:
Nature Biotechnology, Journal Name: Nature Biotechnology Journal Issue: 11 Vol. 37; ISSN 1087-0156
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Understanding off-target effects through hybridization kinetics and thermodynamics journal December 2019
An expanded CRISPRi toolbox for tunable control of gene expression in Pseudomonas putida journal August 2019
Reversed paired-gRNA plasmid cloning strategy for efficient genome editing in Escherichia coli journal March 2020

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