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Three-dimensional biplane spectroscopic single-molecule localization microscopy.

Ki-Hee Song1, Yang Zhang1, Gaoxiang Wang1,2

  • 1Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60201, USA.

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|January 23, 2023
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Summary
This summary is machine-generated.

This study introduces 3D biplane spectroscopic single-molecule localization microscopy (sSMLM) for enhanced cellular imaging. This new method offers homogeneous resolution and efficient photon use, overcoming limitations of previous 3D sSMLM techniques.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Cell Biology

Background:

  • Spectroscopic single-molecule localization microscopy (sSMLM) achieves super-resolution imaging by capturing both spatial and spectral information from single molecules.
  • Current 3D sSMLM methods using astigmatism introduce challenges in spectral calibration and result in depth-dependent lateral resolution.
  • There is a need for improved 3D sSMLM techniques that offer better resolution uniformity and photon efficiency.

Purpose of the Study:

  • To develop and validate a 3D biplane spectroscopic single-molecule localization microscopy (sSMLM) method.
  • To overcome the limitations of astigmatism-based 3D sSMLM, specifically regarding spectral calibration and lateral resolution uniformity.
  • To demonstrate the multi-color 3D imaging capabilities of the proposed 3D biplane sSMLM in biological samples.

Main Methods:

  • Implementation of the biplane imaging method within the existing spatial and spectral channels of sSMLM.
  • Utilizing established sSMLM optical setup with a dispersive element for simultaneous spatial and spectral data acquisition.
  • Imaging fixed COS-7 cells labeled with Alexa Fluor 647 (microtubules) and CF 660C (mitochondria) for multi-color demonstration.

Main Results:

  • Achieved a lateral localization precision of 20 nm with an average of 550 photons.
  • Demonstrated a spectral precision of 4 nm with an average of 1250 photons.
  • Obtained an axial localization resolution of 50 nm, showcasing improved 3D imaging capabilities.

Conclusions:

  • 3D biplane sSMLM provides a superior alternative to astigmatism-based methods for 3D super-resolution imaging.
  • The biplane approach enhances photon efficiency and ensures homogeneous lateral resolution across different depths.
  • This technique enables robust multi-color 3D imaging of cellular structures with high precision.