Light-inducible Expression
Light-inducible Expression - Related Videos
09:08
Rapid Optimization of a Light-Inducible System to Control Mammalian Gene Expression
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Cited by 1 •
2025
This study describes a method for high-throughput experiments using a 3D-printed LED array to optimize light-inducible gene expression in HEK293T cells.
05:28
Light-Induced GFP Expression in Zebrafish Embryos using the Optogenetic TAEL/C120 System
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2021
Optogenetics is a powerful tool with wide-ranging applications. This protocol demonstrates how to achieve light-inducible gene expression in zebrafish embryos using the blue light-responsive TAEL/C120 system.
02:43
Transfection of an Inducible Gene Expression System into Cells Expressing a Bacterial Effector Protein
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2025
Source: Berens, C. et al. Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling. J. Vis. Exp. (2015)This video demonstrates the use of an inducible expression system to identify where the bacterial effector protein CaeB disrupts the host apoptotic cascade. It outlines the steps for transfecting CaeB-expressing cells with a tetracycline-responsive system to induce pro-apoptotic gene expression in order to identify the point of...
07:24
Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
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Cited by 2 •
2015
A simple protocol for the preparation of reduced graphene oxide using visible light and plasmonic nanoparticle is described.
02:23
Quantification of Light-Induced Bacterial Inactivation Through Reactive Oxygen Species Generation
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2025
Source: Cheng, C., et al. Inactivation of Pathogens via Visible-Light Photolysis of Riboflavin-5′-Phosphate. J. Vis. Exp. (2022).In this video, a buffered reaction mixture containing L-methionine, nitro blue tetrazolium (NBT), and flavin mononucleotide (FMN) is irradiated with violet light to induce reactive oxygen species (ROS) production. This leads to bacterial inactivation and the formation of spectrometrically detectable formazan.
FAQs
The key molecular event is a light-triggered change in a photosensitive protein. After detecting its specified wavelength, the protein can alter its conformation or interactions with other components, connecting illumination to transcriptional activation or repression. This coupling may use a linked promoter, transcription factor, or signaling pathway, allowing the same external cue to produce different regulatory outcomes.
Illumination parameters determine the resolution of control. Timing sets when regulation begins or changes, intensity provides an adjustable feature of the light input, and location restricts the response to selected regions. Together, these variables let researchers coordinate gene control with changing cellular conditions rather than relying on a single uniform intervention across all cells.
Compared with chemical induction, light provides an externally applied cue that can be controlled in timing and location. This reduces reliance on added chemical inducers and supports dynamic regulation in living systems. The distinction matters in bioengineering experiments where researchers need expression to follow a spatial pattern or a time-dependent program rather than a single bulk treatment.
The regulatory output depends on how the light-sensitive component is connected to gene-control machinery. A promoter linkage can route the signal directly toward transcription, whereas a transcription factor or signaling pathway can provide an intermediate regulatory step. Choosing among these architectures affects whether illumination activates or represses the selected gene product.
Researchers first link a light-responsive component to a promoter, transcription factor, or signaling pathway controlling the chosen gene. They then define the wavelength and illumination schedule, including when and where light is delivered and how its intensity is adjusted. Examining the resulting expression pattern under these conditions reveals how the engineered control behaves.
Light-inducible expression supports several bioengineering goals. In gene-function studies, it provides controlled changes in protein production; in cell-signaling and metabolic-pathway research, it helps relate expression changes to system behavior. The same approach can be applied to tissue development and therapeutic protein production, where control over timing or location is particularly relevant.
By shifting control from a chemical input to illumination, this approach enables dynamic regulation in living systems. Researchers can use that capability to coordinate expression with developmental or signaling events, or to shape production of a desired protein during an experiment. Its main value is controlling the pattern of production across time and space, not simply turning a gene on.