Biocontainment strategies, such as kill switches, have been developed to avoid the unintended proliferation of genetically engineered microbes (GEMs) intended for open-release environmental applications. However, the presence of GEM DNA after successful biocontainment presents new environmental risks and challenges for monitoring. In this study, we investigated whether biocontainment using a CRISPR-Cas9 kill switch, which causes double-strand breaks in target genes essential for GEM growth, could resolve this challenge in a modelGEM. Surprisingly, the escape rates of the GEM as determined by CRISPR-targeted gene abundances were as high as 10to 10in LB media, despite the escape rates measured by colony forming units (cfu) being only 10under the same condition. This discrepancy suggested that the CRISPR-Cas9 kill switch prevents colony growth while still leaving a large fraction of target genes intact for detection by molecular methods. Within 1 h after biocontainment, these target genes remained predominantly inside an intact cell membrane and were resistant to degradation by DNase, though degradation was observed in river water over multiple days. Overall, a detailed understanding of the impact of the biocontainment mechanism on both the GEM and its DNA is needed to minimize unintended environmental risks. Escherichia coli -1.6 -1 -6.2
CRISPR Gene Editing