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Updated: Jun 27, 2026

Rapid Optimization of a Light-Inducible System to Control Mammalian Gene Expression

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

This summary is machine-generated.

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.

Keywords:

T7 RNA polymerase benzoic acid optogenetics synthetic biology

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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.