A riboswitch-based inducible gene expression system for mycobacteria.

Area of Science:

• Microbiology
• Molecular Biology
• Synthetic Biology

Background:

• Mycobacterium tuberculosis (Mtb) research requires advanced tools for controlled gene expression.
• Existing gene regulation systems in Mtb often necessitate co-expression of accessory proteins, limiting their utility.
• Novel synthetic systems are needed to overcome these limitations for effective Mtb research.

Purpose of the Study:

• To characterize and apply a novel synthetic riboswitch-based system for regulated gene expression in Mtb.
• To demonstrate the system's ability to reversibly control gene expression, including protein overexpression and gene knockdown.
• To evaluate the system's efficacy within a macrophage infection model.

Main Methods:

• Development of a synthetic riboswitch system integrating a mycobacterial promoter and a riboswitch.
• Application of the system for inducible and repressible heterologous protein overexpression.
• Utilizing the system for conditional gene knockdown in Mtb.
• Testing the system's performance in a macrophage infection model.

Main Results:

• The synthetic riboswitch system demonstrated reversible control over gene expression in Mtb.
• The system successfully induced and repressed heterologous protein overexpression.
• Conditional gene knockdown was achieved using the riboswitch platform.
• Effective gene expression control was observed within a macrophage infection model.

Conclusions:

• The developed inducible riboswitch platform offers a powerful, self-contained strategy for customized gene regulation in Mtb.
• This system eliminates the need for accessory proteins, simplifying gene expression control.
• The platform has broad potential for advancing research on the human pathogen Mtb.