{
  "id": 18301012,
  "title": "RNA-triggered Cas12a2 antibacterial activity and resistance plasmid degradation",
  "url": "https://urgent.news/2026/11/05/rna-triggered-cas12a2-antibacterial-activity-and-resistance-plasmid",
  "topic": "science",
  "section": "Science",
  "published": "2026-11-05T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.11.03.763947v1?rss=1"
  },
  "original_language": "en",
  "account": "Antimicrobial resistance (AMR) demands innovative antibacterial approaches with unique mechanisms. Researchers examined an inducible intracellular CRISPR/Cas12a2 system in modified Escherichia coli designed to target a chloramphenicol-resistant (Chl) transcript. Activation of Cas12a2 considerably slowed bacterial growth and decreased colony-forming units (CFU) by 3-log10 in a laboratory setting, while also reducing bacterial presence in a mouse skin wound experiment.\n\nInvestigating the system's impact at a genetic level, the researchers discovered an increase in the expression of recA, a crucial component of the SOS response. Consequently, they developed a Chl-recA dual-targeting construct, which demonstrated a more substantial growth delay compared to single-targeting versions. This enhanced system achieved approximately a 4-log10 reduction in bacterial presence in living organisms.\n\nAdditionally, the researchers performed exploratory quantitative polymerase chain reaction (qPCR) on culture supernatants, which indicated a decrease in recoverable plasmid DNA, potentially linked to the treatment. Overall, this study presents preliminary evidence for resistance-transcript-guided Cas12a2 antibacterial activity, emphasizing the potential of targeting stress-associated transcripts to improve programmable antimicrobials.",
  "summary": "Antimicrobial resistance (AMR) necessitates programmable antibacterial strategies with novel mechanisms. Here, we evaluated an inducible intracellular CRISPR/Cas12a2 system in engineered Escherichia coli targeting a chloramphenicol-resistance (Chl) transcript. Cas12a2 activation significantly delayed bacterial growth and reduced recoverable colony-forming units (CFU) by 3-log10 in vitro, and…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}