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Reporter Genes

Reporter Genes

Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.

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Rapid, Affordable, and Uncomplicated Production of Bacterial Cell-free Lysate

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A Clostridioides difficile cell-free gene expression system for prototyping and gene expression analysis.

Ji Zeng¹, Hao Wang¹, Yuxi Xu¹

¹School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, Guangdong, China.

Applied and Environmental Microbiology

|January 2, 2025

Summary

A new cell-free gene expression (CFE) system simplifies studying Clostridioides difficile, enabling rapid in vitro transcription and translation (TX-TL) in oxygen. This tool accelerates research on this urgent threat by improving protein yield and gene expression analysis.

Keywords:

CFE system Clostridioides difficile in vitro expression prototyping tcdR and tcdB expression

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Area of Science:

Microbiology and Molecular Biology
Synthetic Biology

Background:

Clostridioides difficile is an anaerobic, Gram-positive bacterium and an urgent threat due to antibiotic resistance.
Current gene expression analysis of C. difficile is labor-intensive, requiring anaerobic conditions and inefficient genetic material introduction.
Cell-free gene expression (CFE) systems offer a simplified approach for in vitro transcription and translation (TX-TL).

Purpose of the Study:

To develop a simplified Clostridioides difficile cell-free gene expression (CFE) system for in vitro analysis.
To optimize the CFE system for enhanced protein yield and assess its utility for studying gene regulation and toxin expression.

Main Methods:

Development and optimization of a C. difficile cell extract preparation and reaction system.
Evaluation of linear DNA templates versus circular plasmids for in vitro expression.
Assessment of the CFE system's prototyping capability using synthetic Clostridium promoters.
Testing expression of toxin genes (tcdB, tcdR) from clinical C. difficile isolates.

Main Results:

A functional C. difficile CFE system was established, enabling in vitro TX-TL in the presence of oxygen.
Optimized conditions significantly increased protein yield, with linear DNA templates outperforming plasmids.
The CFE system demonstrated a good correlation between in vivo and in vitro promoter activity.
Higher toxin expression was confirmed for the hypervirulent R20291 strain using the CFE system.

Conclusions:

The developed C. difficile CFE system provides a simplified platform for in vitro protein synthesis and genetic part prototyping.
This system facilitates accelerated study of gene expression and function in C. difficile, even in the presence of oxygen.
The CFE system holds potential as a simplified model for investigating metabolic regulations in C. difficile.