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Updated: Jun 27, 2026
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Rapid Optimization of a Light-Inducible System to Control Mammalian Gene Expression
Published on: November 4, 2025
Design and Implementation of a Blue-Light-Controlled Gene-Switch System
Chen Li1, Yuan Shi1, Xinyan Jiang1
1Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling 712100, China.
Molecules (Basel, Switzerland)
|June 26, 2026
Summary
We engineered a novel synthetic biology system for precise gene control using blue light and a chemical off-switch. This programmable tool enhances biomanufacturing, antimicrobial therapy, and environmental applications.
Area of Science:
- Synthetic Biology
- Genetic Engineering
- Molecular Biology
Background:
- Synthetic biology aims to create predictable and programmable biological systems.
- Precise spatiotemporal gene control is crucial for applications like biomanufacturing, therapy, and microbial engineering.
Purpose of the Study:
- To develop a blue-light-inducible T7 RNA polymerase (T7RNAP) system with dual-input regulation for precise gene control.
- To optimize the system for enhanced expression, fidelity, and responsiveness.
Main Methods:
- Optimization involved modifying ribosome binding site (RBS) sequences and evaluating split-T7RNAP variants.
- Tandem T7 promoters were tested to balance gene expression yield and fidelity.
- Bactericidal efficacy and expression levels were measured using fluorescent output and real-time growth curves under blue light.
Main Results:
- RBS variants led to significant expression differences (up to 50-fold).
- Three tandem T7 promoters offered optimal yield and fidelity.
- A benzoate-responsive module achieved 4.5-fold repression, demonstrating effective chemical "off-switching" without hindering light induction.
Conclusions:
- The developed system integrates precise blue light control with environmental responsiveness for on-demand gene activation.
- The benzoate-triggered off-switch is valuable for biocontainment and bioremediation, enabling gene expression shutdown in response to pollutants.
- Its modular and orthogonal design facilitates context-dependent control for diverse applications including biosensors, probiotics, and antimicrobial delivery systems.
