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RiboCas: A Universal CRISPR-Based Editing Tool for Clostridium.

Inés C Cañadas1, Daphne Groothuis1, Maria Zygouropoulou1

  • 1Clostridia Research Group, BBSRC/EPSRC Synthetic Biology Research Centre (SBRC), School of Life Sciences, Centre for Biomolecular Sciences , The University of Nottingham , Nottingham NG7 2RD , U.K.

ACS Synthetic Biology
|June 12, 2019
PubMed
Summary

Scientists developed a new gene editing tool, RiboCas, for Clostridium bacteria. This theophylline-dependent riboswitch system improves efficiency and reduces toxicity compared to CRISPR/Cas9, enabling broad applications in diverse species.

Keywords:
CRISPRinducible expressionriboswitchsynthetic biology

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Area of Science:

  • Microbiology
  • Synthetic Biology
  • Genetics

Background:

  • Clostridium species are medically and industrially significant but require effective genome editing tools for research and application.
  • Existing CRISPR/Cas9 systems face challenges like low transformation efficiency and Cas9 toxicity in Clostridium.

Purpose of the Study:

  • To develop and implement novel synthetic riboswitches for controlled gene expression in Clostridium.
  • To create an efficient and less toxic genome editing tool based on these riboswitches.

Main Methods:

  • Demonstration of theophylline-dependent synthetic riboswitches with a full dynamic range in Clostridium.
  • Development of RiboCas, a riboswitch-based genome editing system.
  • Application of RiboCas for chromosomal modifications in Clostridium pasteurianum, C. difficile, and C. sporogenes.
  • First reported CRISPR-targeted gene disruption in Clostridium botulinum using RiboCas.

Main Results:

  • Successful implementation of synthetic riboswitches for tightly controlled gene expression in Clostridium.
  • Generation of RiboCas, a novel genome editing tool overcoming CRISPR/Cas9 limitations.
  • Achieved chromosomal modifications in multiple Clostridium species, demonstrating RiboCas's broad applicability.
  • 100% mutant generation efficiency and ease of application reported for RiboCas.

Conclusions:

  • RiboCas represents a significant advancement in Clostridium genome editing, offering high efficiency and reduced toxicity.
  • The universal nature of RiboCas makes it suitable for a wide range of microorganisms.
  • This tool facilitates a deeper understanding and enhanced exploitation of Clostridium species.