miRNA modules for precise, tunable control of gene expression

Area of Science:

• Synthetic biology
• Molecular and cell biology
• Biotechnology

Background:

• Precise control of transgene expression is crucial for cellular research and therapeutic applications.
• Current gene delivery methods lack quantitative control and are often inefficient.
• Existing compensation mechanisms have limitations in tunability and complexity.

Purpose of the Study:

• To develop a novel toolkit of synthetic gene expression regulators for precise and tunable transgene control.
• To achieve dosage-invariant protein expression across varying genetic contexts.
• To enable independent control of multiple genes within the same cell.

Main Methods:

• Design and implementation of compact, synthetic microRNA (miRNA)-based circuit modules (DIMMERs).
• Utilizing multivalent miRNA regulatory interactions within an incoherent feed-forward loop architecture.
• Development of a heuristic miRNA design algorithm for orthogonal circuit variants.

Main Results:

• DIMMERs achieve nearly uniform protein expression over a wide range of gene dosages and transcription rates.
• Demonstrated precise, tunable, and dosage-invariant control of transgenes in diverse cell types.
• Successfully applied DIMMERs to enhance CRISPR imaging and super-resolution EGFR receptor imaging.

Conclusions:

• The DIMMERs toolkit provides a powerful solution for precise and tunable gene expression control.
• These regulators are portable across different cell types and applicable to various biotechnology fields.
• The developed system advances gene therapy and fundamental biological research through improved transgene expression management.