Self-feedback loop-containing synthetic mRNA switches for controlled microRNA sensing

Area of Science:

• Synthetic biology
• Molecular engineering
• Genetic circuits

Background:

• Synthetic messenger RNA (mRNA) switches offer precise control over protein expression for cell fate manipulation.
• Current limitations exist in mimicking natural sophisticated protein regulation with existing mRNA switch designs.

Purpose of the Study:

• To develop novel synthetic mRNA switches with self-feedback loops for dynamic protein expression control.
• To enhance microRNA sensing capabilities and enable binary cell regulation.

Main Methods:

• Incorporated self-feedback loop machineries into mRNA switch designs.
• Redesigned coding regions to express output proteins and mRNA regulatory proteins (RBPs).
• Utilized RNA-binding proteins (RBPs) and aptamers to guide regulatory actions on target mRNAs.

Main Results:

• Demonstrated dynamic control of protein expression in response to cellular microRNAs.
• Showcased enhanced or flattened microRNA sensing effects through feedback mechanisms.
• Achieved a nearly all-or-none response pattern for microRNA detection using positive feedback switches.

Conclusions:

• Novel mRNA switch designs with self-feedback loops significantly improve microRNA sensing and binary cell regulation.
• These engineered switches provide advanced strategies for constructing complex mRNA-based genetic circuits.
• The developed technology holds promise for future molecular sensing and cell engineering applications.