An enhanced green fluorescence protein (EGFP)-based reporter assay for quantitative detection of sporulation in...

Area of Science:

• Microbiology
• Molecular Biology
• Food Safety

Background:

• Clostridium perfringens type F causes foodborne illness through enterotoxin production.
• Enterotoxin production is linked to bacterial sporulation, regulated by transcription factor Spo0A.
• Identifying intestinal factors that induce sporulation is crucial for understanding disease mechanisms.

Purpose of the Study:

• To develop and validate a reliable method for quantifying Clostridium perfringens sporulation.
• To assess the utility of fluorescent reporters for monitoring sporulation dynamics.
• To explore applications in screening for sporulation-modulating agents.

Main Methods:

• Established microscopy-based assays using two fluorescent reporters: Evoglow-Bs2 and CpEGFP.
• Quantified reporter gene expression under the control of the cpe promoter.
• Evaluated reporter detectability, photostability, and correlation with spore yield.
• Utilized fluorescence plate reader for high-throughput quantification.

Main Results:

• CpEGFP expression was specific to the sporulation stage and localized to the mother-cell compartment.
• CpEGFP showed superior detectability and photostability compared to Evoglow-Bs2.
• CpEGFP expression levels accurately predicted final spore yield.
• Quantification in 96-well plates demonstrated high-throughput potential.

Conclusions:

• CpEGFP is a robust and effective reporter for analyzing Clostridium perfringens sporulation.
• This reporter system facilitates the study of sporulation regulation in C. perfringens.
• CpEGFP has potential applications in large-scale screening of molecules that regulate bacterial sporulation.