RNA-triggered cell killing with CRISPR-Cas12a2

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Targeted cell elimination is crucial across various scientific fields.
• CRISPR nucleases are effective for bacterial counterselection but limited in eukaryotes.
• Cas12a2 is a novel CRISPR nuclease with RNA-triggered DNA shredding capabilities.

Purpose of the Study:

• To investigate the potential of Cas12a2 for programmable, sequence-specific cell elimination in eukaryotes.
• To demonstrate Cas12a2's ability to induce cell death via DNA breaks in trans.
• To explore Cas12a2 applications in eliminating cells based on specific transcripts.

Main Methods:

• Utilized the Cas12a2 nuclease system.
• Activated Cas12a2 with specific RNA triggers to induce DNA shredding.
• Applied the system to yeast and human cells expressing target transcripts.
• Assessed cell viability and off-target effects.

Main Results:

• Cas12a2 demonstrated RNA-triggered, sequence-specific DNA shredding.
• Activation of Cas12a2 led to double-stranded DNA breaks and cell death in target cells.
• The system successfully eliminated cells harboring human papillomavirus, failed gene editing, or KRAS oncogenic mutations.
• No off-target activation was observed.

Conclusions:

• Cas12a2 enables programmable and sequence-specific elimination of eukaryotic cells based on transcriptional profiles.
• This expands the CRISPR toolbox for applications in research, medicine, and biotechnology.
• Cas12a2 offers a novel approach for targeted cell ablation with high specificity.