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Reporter Genes02:11

Reporter Genes

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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Light-Activated Gene Expression System Using a Caging-Group-Free Photoactivatable Dye.

Tatsuki Nonomura1,2, Masafumi Minoshima1,3, Kazuya Kikuchi1,4

  • 1Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka, 5650871, Japan.

Angewandte Chemie (International Ed. in English)
|October 24, 2024
PubMed
Summary

Researchers developed a novel light-mediated system for controlling gene expression. This method uses a photoactivatable dye (PaX560) and a transcriptional regulator (QacR) for precise, visible light-activated transcription with reduced toxicity.

Keywords:
cell-free transcriptionmultidrug-binding transcriptional regulatoroptical gene expressionphotoactivatable dyetranscriptional regulation

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Optogenetics

Background:

  • Optical regulation of gene expression offers precise spatiotemporal control.
  • Conventional methods using photoremovable protecting groups often require harsh UV light and can produce toxic byproducts.

Purpose of the Study:

  • To develop a novel, caging-group-free system for light-mediated transcriptional regulation.
  • To achieve transcriptional activation using mild visible light and a photoactivatable dye.
  • To integrate this system into a gene expression platform for in vitro and cellular applications.

Main Methods:

  • Development of a light-mediated transcriptional regulation system combining the photoactivatable dye PaX560 and the transcriptional regulator QacR.
  • Utilizing traceless photoconversion of PaX560 to generate a cationic dye that binds and modulates QacR activity.
  • Integration of the PaX560-QacR module into the T7 RNA polymerase expression system.

Main Results:

  • Demonstrated light-activated transcriptional activation via PaX560-mediated QacR modulation under mild visible light.
  • Achieved transcriptional activation with a large dynamic range.
  • Enabled simultaneous detection of the photoactivated effector's state.
  • Successfully demonstrated light-activated transcription in vitro and within living cells.

Conclusions:

  • The developed system provides an effective and less toxic alternative for optical control of transcription.
  • This novel approach allows for precise, visible light-induced gene expression manipulation.
  • The system holds potential for advanced applications in synthetic biology and molecular research.