Compact CRISPR-based genetic circuitry using a miniature genome-integrated Cas12m protein

Genome-integrated, inducible Cas12m in Escherichia coli enables rapid, low-burden repression and supports compact NOT-gate genetic circuitry.

• Why it matters: dCas9-based regulators can burden hosts, release targets slowly, and experience guide RNA interference, limiting efficient, scalable circuit design.
• What they did: The authors engineered an Escherichia coli strain with inducible genome-integrated Cas12m, defined Cas12m guide RNA design features, and built NOT gates and a multi-layer circuit.
• The result: Cas12m repression is more rapidly reversible than dCas9 and largely unaffected by a competing guide, enabling concurrent control of two metabolic pathways in the multi-layer circuit.