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Louis G Jensen1, Tjun Yee Hoh2, David J Williamson3

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This study introduces a model-based correction (MBC) workflow to address artificial clustering in photoactivated localization microscopy (PALM) data caused by fluorophore blinking. The new method accurately identifies true fluorophore locations, enhancing precision and enabling quantitative analysis of protein clustering.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Microscopy

Background:

  • Photoactivated localization microscopy (PALM) is a super-resolution technique crucial for visualizing cellular structures.
  • Fluorophore blinking and localization errors in PALM data lead to artificial clustering, obscuring true biological organization.
  • Accurate quantification of protein distribution is essential for understanding cellular function.

Purpose of the Study:

  • To develop and validate a novel workflow for correcting artificial clustering in PALM data.
  • To improve the accuracy of fluorophore localization and enable precise quantification of protein clusters.
  • To confirm the clustered distribution of the linker for activation of T cells (LAT) protein at the T cell immunological synapse.

Main Methods:

  • Development of a 'model-based correction' (MBC) workflow.
  • Calibration-free estimation of fluorophore blinking dynamics.
  • Model-based clustering for identifying true fluorophore locations.
  • Validation using simulated and experimental data with known ground truth.

Main Results:

  • The MBC workflow significantly reduces artificial clustering in PALM data.
  • Enhanced localization precision and accuracy in corrected datasets.
  • Quantifiable analysis of cluster descriptors, including the absolute number of fluorophores per cluster.
  • Confirmation of linker for activation of T cells (LAT) protein clustering at the T cell immunological synapse.

Conclusions:

  • The MBC workflow provides a robust solution for artifact correction in PALM super-resolution microscopy.
  • Accurate localization and quantitative analysis of protein distribution are now achievable.
  • The findings validate the clustered nature of LAT at the T cell immunological synapse, advancing our understanding of immune cell interactions.