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Related Experiment Video

Updated: Jun 13, 2026

FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

Published on: August 20, 2012

FRET-enabled optical modulation for high sensitivity fluorescence imaging.

Chris I Richards¹, Jung-Cheng Hsiang, Andrew M Khalil

¹School of Chemistry and Biochemistry and Petit Institute for Biosciences and Bioengineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

Journal of the American Chemical Society

|April 20, 2010

Summary

This summary is machine-generated.

This study introduces Synchronously Amplified Fluorescence Image Recovery (SAFIRe) to boost imaging sensitivity. SAFIRe uses fluorescence resonance energy transfer to recover faint signals from high backgrounds, improving detection by over 10-fold.

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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors

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Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer

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Published on: October 1, 2016

Area of Science:

Biophysics
Optical Imaging
Spectroscopy

Background:

High background noise significantly limits fluorescence imaging sensitivity.
Current methods struggle to recover weak fluorescence signals from complex biological environments.
Developing novel techniques for signal amplification is crucial for advancing bioimaging.

Purpose of the Study:

To develop a generalized method for signal amplification in fluorescence imaging using fluorescence resonance energy transfer (FRET).
To improve fluorescence imaging sensitivity by enabling selective signal recovery from high background noise.
To establish a technique for determining fluorophore dark-state lifetimes through modulation frequency analysis.

Main Methods:

Utilized FRET to engineer donor photophysics for signal amplification.
Employed dynamic, simultaneous, and direct excitation of an acceptor to modulate donor emission.
Developed a demodulation technique for selective donor fluorescence extraction.
Incorporated an acceptor with a spectrally shifted, dark-state population for low excitation intensity requirements.
Used Cy5 acceptors and Cy3 donors to demonstrate the SAFIRe technique.

Main Results:

Achieved facile signal amplification and selective fluorescence recovery from high background.
Demonstrated a >>10-fold improvement in imaging sensitivity using SAFIRe.
Showed that modulation frequency directly yields dark-state lifetimes in ensemble measurements.
Validated low excitation intensity requirements through simulations and experiments.
Successfully extracted images from large background noise.

Conclusions:

SAFIRe offers a powerful approach to drastically improve fluorescence imaging sensitivity.
The technique is generalizable to various fluorophore combinations.
SAFIRe provides a direct method for measuring dark-state lifetimes.
This method significantly enhances the ability to visualize biological processes in challenging environments.