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Updated: Feb 4, 2026

Assessing Protein Interactions in Live-Cells with FRET-Sensitized Emission

Assessing Protein Interactions in Live-Cells with FRET-Sensitized Emission

Published on: April 22, 2021

Homotransfer of FRET Reporters for Live Cell Imaging.

Nicole E Snell¹, Vishnu P Rao², Kendra M Seckinger³

¹Department of Physiology, University of Maryland School of Medicine, 660 W Redwood St/HH525B, Baltimore, MD 21201, USA. nicole.snell@umaryland.edu.

|October 14, 2018

Summary

This summary is machine-generated.

Förster resonance energy transfer (FRET) using identical fluorophores (homotransfer) offers advantages in biosensor design. This method, measured with polarization microscopy, enhances signal-to-noise and sensor compatibility.

Keywords:

FRET GFP anisotropy biosensor fluorescent protein homotransfer

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Area of Science:

Biophysics
Molecular Biology
Biotechnology

Background:

Förster resonance energy transfer (FRET) was initially observed between fluorophores of the same type (homotransfer).
Modern biosensors increasingly utilize genetically encoded fluorescent proteins, reviving interest in homotransfer FRET principles.

Purpose of the Study:

To discuss the theoretical underpinnings of measuring homotransfer FRET using fluorescence polarization microscopy.
To review existing genetically encoded homotransfer biosensors and their applications.

Main Methods:

Utilizing fluorescence polarization microscopy to quantify FRET between spectrally similar or identical fluorophores.
Discussing procedures for data collection and processing specific to homotransfer measurements.

Main Results:

Homotransfer FRET demonstrates enhanced signal-to-noise ratios compared to heterotransfer.
It offers greater compatibility with other optical sensing modalities and modulators.
Enables novel biosensor designs based on protein clustering or dimerization.

Conclusions:

Homotransfer FRET, particularly when measured by polarization microscopy, presents significant advantages for biosensor development.
This technique facilitates the creation of more robust and versatile genetically encoded biosensors.