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Related Experiment Video

Updated: Nov 18, 2025

A Fluorescence Fluctuation Spectroscopy Assay of Protein-Protein Interactions at Cell-Cell Contacts

A Fluorescence Fluctuation Spectroscopy Assay of Protein-Protein Interactions at Cell-Cell Contacts

Published on: December 1, 2018

Confocal-based fluorescence fluctuation spectroscopy with a SPAD array detector.

Eli Slenders¹, Marco Castello¹, Mauro Buttafava²

¹Molecular Microscopy and Spectroscopy, Istituto Italiano di Tecnologia, Genoa, Italy.

Light, Science & Applications

|February 5, 2021

Summary

This summary is machine-generated.

This study introduces a new detector array for confocal laser-scanning microscopy (CLSM) combined with fluorescence fluctuation spectroscopy (FFS). This innovation simplifies data analysis and enables advanced imaging techniques for studying biomolecular processes.

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Area of Science:

Biophysics
Cell Biology
Microscopy

Background:

Confocal laser-scanning microscopy (CLSM) coupled with fluorescence fluctuation spectroscopy (FFS) is vital for analyzing rapid, sub-resolution biomolecular dynamics in live cells.
Existing detector arrays for CLSM-based FFS require complex data corrections and limit integration with single-photon methods like fluorescence lifetime imaging.

Purpose of the Study:

To overcome limitations of current detector arrays in CLSM-FFS systems.
To introduce a novel single-photon-avalanche-diode (SPAD) array detector for enhanced CLSM-FFS analysis.
To enable simultaneous spatial and temporal data acquisition for biomolecular studies.

Main Methods:

Integration of a novel single-photon-avalanche-diode (SPAD) array detector into a CLSM system.
Validation using multiple FFS techniques: spot-variation fluorescence correlation spectroscopy, pair-correlation function analysis, and image-derived mean squared displacement analysis.
Demonstration of simultaneous acquisition of multiple samples within the CLSM detection volume.

Main Results:

The novel SPAD array detector successfully overcomes previous limitations in CLSM-FFS.
The system allows for simplified data correction and seamless integration with single-photon techniques.
Validated FFS analyses confirm the detector's capability for precise biomolecular process studies.

Conclusions:

The developed CLSM system with a SPAD array detector offers a powerful and versatile tool for studying fast, sub-resolution biomolecular processes.
This architecture provides a unique combination of spatial and temporal information, making it ideal for advanced live-cell imaging.
The proposed method is poised to become a preferred technique for CLSM-based FFS applications.