Macrolide-based transgene control in mammalian cells and mice

Area of Science:

• Molecular Biology
• Gene Regulation
• Biotechnology

Background:

• Advanced gene therapy, tissue engineering, and biopharmaceutical manufacturing require precise control over multiple transgene expressions in mammalian systems.
• Existing gene regulation systems often lack the fine-tuning necessary for complex applications.

Purpose of the Study:

• To develop novel, antibiotic-dependent mammalian gene regulation systems (E.REX) for adjustable control of multiple transgenes.
• To create both repressible (E(OFF)) and inducible (E(ON)) systems responsive to clinically approved macrolide antibiotics.

Main Methods:

• Utilized the antibiotic-dependent interaction between the *Escherichia coli* repressor (E) and operator (ETR).
• Designed chimeric transactivators and synthetic promoters for the E(OFF) system.
• Engineered ETR-derived operators adjacent to constitutive promoters for the E(ON) system.
• Tested E.REX systems in primary cells, cell lines, and microencapsulated cells in vivo.

Main Results:

• Demonstrated successful, antibiotic-inducible and -repressible transgene expression using E.REX systems.
• Showcased control in diverse cellular contexts, including primary cells and transplanted microencapsulated cells.
• Confirmed functional compatibility with other regulatory systems like PIP and TET, enabling multigene applications.

Conclusions:

• The macrolide-responsive E.REX technology provides a versatile platform for precise, adjustable gene expression in mammalian systems.
• E.REX systems are suitable for advanced applications in gene therapy, drug discovery, and biomanufacturing.
• The compatibility of E.REX with other systems opens possibilities for complex, multi-regulated gene therapies.