FoCuS-point: software for STED fluorescence correlation and time-gated single photon counting

Area of Science:

• Biophysics
• Cellular dynamics
• Microscopy techniques

Background:

• Fluorescence Correlation Spectroscopy (FCS) is vital for studying molecular mobility and interactions in living cells.
• Combining FCS with STED microscopy (STED-FCS) enhances resolution.
• Gated detection in STED-FCS shows promise but requires specialized software for efficient data analysis.

Purpose of the Study:

• To develop and provide open-source software for practical time-gating and correlation of point data from STED-FCS experiments.
• To address the demand for efficient software implementing advanced algorithms for STED-FCS analysis.

Main Methods:

• Development of a stand-alone software package named FoCuS-point.
• Implementation of time-correlated single-photon counting (TCSPC) correlation algorithms.
• Inclusion of time-gated filtering, innovative data visualization, and advanced fitting algorithms.

Main Results:

• FoCuS-point offers a user-friendly interface for handling large datasets.
• The software efficiently processes files in bulk and provides rapid analysis of diffusion kinetics.
• Advanced fitting algorithms allow quick determination of correlation curve parameters.

Conclusions:

• FoCuS-point provides a crucial open-source solution for advanced STED-FCS data analysis.
• The software enhances the efficiency and accessibility of studying molecular dynamics in cellular environments.
• FoCuS-point facilitates quicker and more accurate insights into diffusion kinetics and molecular interactions.