RNA‑guided dCas12f–σE activates bacterial genes
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- dCas12f–σE—an exapted CRISPR‑Cas12f homolog—was identified in Bacteroidetes bacteria and functions as an RNA‑guided transcription activator rather than a DNA cutter.
- The system activates genes linked to iron, peptide, and carbohydrate import, suggesting a role in nutrient acquisition for gut microbes.
- Guide RNAs can be swapped to target any gene, allowing synthetic biologists to program transcription without relying on protein‑DNA motifs.
- Sternberg’s lab demonstrated simultaneous activation of multiple genes using several guide RNAs, a strategy that could uncover hidden antibiotic‑producing pathways.
- The authors propose that similar RNA‑guided transcription mechanisms may exist across eukaryotes, hinting at broader genome‑engineering applications.
- Jacob and Monod’s 1961 hypothesis that RNA could regulate genes via base‑pairing is now supported by this bacterial system.
Why it matters: Synthetic biologists gain a flexible RNA‑based switch that can activate any bacterial gene without DNA motifs, accelerating metabolic engineering and antibiotic discovery, while researchers can now explore cryptic gene clusters in gut microbes for therapeutic applications and could enable precise manipulation of microbiome functions.
