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Title: Light-sheet Bayesian microscopy enables deep-cell super-resolution imaging of heterochromatin in live human embryonic stem cells

Journal Article · · Optical Nanoscopy
 [1];  [2];  [2];  [3];  [1];  [1];  [2];  [1]
  1. Salk Institute for Biological Studies, La Jolla, CA (United States). Waitt Advanced Biophotonics Center
  2. Salk Institute for Biological Studies, La Jolla, CA (United States). Lab. of Genetics
  3. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Bioengineering

Heterochromatin in the nucleus of human embryonic cells plays an important role in the epigenetic regulation of gene expression. The architecture of heterochromatin and its dynamic organization remain elusive because of the lack of fast and high-resolution deep-cell imaging tools. We enable this task by advancing instrumental and algorithmic implementation of the localization-based super-resolution technique. We present light-sheet Bayesian super-resolution microscopy (LSBM). We adapt lightsheet illumination for super-resolution imaging by using a novel prism-coupled condenser design to illuminate a thin slice of the nucleus with high signal-to-noise ratio. Coupled with a Bayesian algorithm that resolves overlapping fluorophores from high-density areas, we show, for the first time, nanoscopic features of the heterochromatin structure in both fixed and live human embryonic stem cells. The enhanced temporal resolution allows capturing the dynamic change of heterochromatin with a lateral resolution of 50–60 nm on a time scale of 2.3 s. Light-sheet Bayesian microscopy opens up broad new possibilities of probing nanometer-scale nuclear structures and real-time sub-cellular processes and other previously difficult-to-access intracellular regions of living cells at the single-molecule, and single cell level.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1629936
Journal Information:
Optical Nanoscopy, Vol. 2, Issue 1; ISSN 2192-2853
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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Light sheet approaches for improved precision in 3D localization-based super-resolution imaging in mammalian cells [Invited] journal January 2018
The light-sheet microscopy revolution journal April 2018
Infrared nanospectroscopic mapping of a single metaphase chromosome journal July 2019
Superresolution imaging reveals nanometer- and micrometer-scale spatial distributions of T-cell receptors in lymph nodes journal June 2016
Tilted light sheet microscopy with 3D point spread functions for single-molecule super-resolution imaging in mammalian cells conference March 2018
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A simple microfluidic device for live-imaging of the vertical section of epithelial cells journal January 2020
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