RNA-triggered Cas12a2 antibacterial activity and resistance plasmid degradation

An inducible intracellular Cas12a2 system in engineered Escherichia coli targeting a chloramphenicol-resistance transcript delayed growth and reduced recoverable CFU by 3-log10 in vitro.

• Why it matters: AMR drives the need for programmable antibacterial approaches with new mechanisms, and transcript-guided targeting could offer specificity beyond conventional antibiotics.
• What they did: The authors induced Cas12a2 in Escherichia coli and measured growth and CFU, then tested activity in a mouse skin wound model; transcriptomics identified recA upregulation and enabled a Chl-recA dual-targeting construct.
• The result: Dual targeting produced a greater growth delay and yielded an approximately 4-log10 reduction in bacterial burden in vivo, with exploratory qPCR suggesting treatment-associated decreases in amplifiable plasmid DNA.

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