Gene cloning in Clostridium difficile using Tn916 as a shuttle conjugative transposon

Area of Science:

• Molecular Biology
• Microbiology
• Genetics

Background:

• Clostridium difficile poses significant challenges in healthcare settings.
• Development of effective genetic tools for C. difficile is crucial for research and therapeutic development.

Purpose of the Study:

• To develop and validate a novel cloning vector for gene manipulation in Clostridium difficile.
• To demonstrate the feasibility of using the pCI195 vector for cloning C. difficile genes.

Main Methods:

• Construction of a pBR322-based vector, pCI195, containing a fragment of the conjugative transposon Tn919.
• Integration of pCI195 into the Bacillus subtilis chromosome containing Tn916 delta E.
• Transfer of the transposon::plasmid construct to Clostridium difficile via filter mating.
• Cloning of a C. difficile toxin B gene fragment into pCI195.

Main Results:

• pCI195 integrated into the Tn916 delta E transposon in B. subtilis.
• The transposon::plasmid structure was successfully transferred to C. difficile, integrating into the chromosome at a specific site.
• A C. difficile toxin B gene fragment was cloned into pCI195, creating pPPM100.
• The engineered vector was stably maintained in C. difficile.

Conclusions:

• The pCI195 vector, integrated within the Tn916 delta E transposon, is a functional tool for gene cloning in Clostridium difficile.
• This represents the first report of successful gene cloning in C. difficile using this novel vector system.
• The transposon::plasmid system offers potential for broad applicability in transferring genetic material to various C. difficile strains.