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Related Experiment Video

Updated: Nov 23, 2025

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
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Determining the optimal expression method for dual-color imaging.

Jacob F Norman1, Bahar Rahsepar1, Jad Noueihed1

  • 1Dept. of Biomedical Engineering, Center for Systems Neuroscience, Neurophotonics Center, Boston University, Boston, MA, 02215, United States.

Journal of Neuroscience Methods
|January 2, 2021
PubMed
Summary

Researchers optimized coexpression of multiple fluorescent proteins for neuronal recording. The double-virus method significantly improves coexpression compared to standard methods, enabling better population activity analysis and cell-type identification.

Keywords:
Calcium imagingCell-type specificityGCaMP

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biotechnology

Background:

  • Fluorescence imaging enables simultaneous, cell-type-specific neuronal recording.
  • Multiple fluorescent proteins are used to mark additional neuronal subpopulations.
  • Optimal methods for coexpressing multiple fluorescent proteins are currently undefined.

Purpose of the Study:

  • To optimize the coexpression of two fluorescent proteins.
  • To compare different expression methods for fluorescent proteins.

Main Methods:

  • Coexpression of two fluorescent proteins was optimized across various brain regions and mouse lines.
  • The double-virus method (mixture of two viruses in a Cre driver mouse) was investigated.
  • The single-virus method (viral injection in a double transgenic reporter mouse) was used as a comparison.

Main Results:

  • The double-virus method achieved up to 70% coexpression of fluorescent markers in vitro, significantly higher than the single-virus method.
  • This improved coexpression was validated across multiple brain regions and mouse lines, both in vitro and in vivo.
  • The double-virus method facilitates population activity recording and neuronal subpopulation determination.

Conclusions:

  • Efficient coexpression of multiple fluorescent proteins is crucial for simultaneous population activity recording and neuronal subpopulation identification.
  • The optimized double-virus method offers a significant improvement over standard techniques.
  • This enhanced coexpression technique has broad applications, including engram research and voltage imaging.