Dual-color fluorescence cross-correlation spectroscopy on a single plane illumination microscope (SPIM-FCCS)

Area of Science:

• Biophysics
• Microscopy
• Spectroscopy

Background:

• Single plane illumination microscopy based fluorescence correlation spectroscopy (SPIM-FCS) enables 3D imaging of molecular dynamics.
• Existing methods lack the capability to image molecular interactions in real-time within complex biological systems.

Purpose of the Study:

• To extend SPIM-FCS to two-color fluorescence cross-correlation spectroscopy (SPIM-FCCS) for imaging molecular interactions.
• To establish a theoretical framework and validation for SPIM-FCCS in diverse biological samples.

Main Methods:

• Development and theoretical modeling of two-color fluorescence cross-correlation spectroscopy (SPIM-FCCS).
• Application of SPIM-FCCS to in-vitro samples including microspheres, DNA, and vesicles.
• In-vivo validation using fluorescent proteins and membrane proteins in live biological systems.

Main Results:

• SPIM-FCCS successfully images molecular interactions in 3D with high resolution.
• Quantitative measurements of molecular interactions were achieved, comparable to confocal FCCS.
• The method demonstrated superior statistical accuracy and true imaging capabilities.

Conclusions:

• SPIM-FCCS is a powerful new tool for studying molecular interactions in biological samples.
• This technique offers significant advantages over existing methods, including enhanced imaging and statistical power.
• SPIM-FCCS opens new avenues for understanding complex biological processes at the molecular level.