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Related Concept Videos

Chromatin Packaging02:21

Chromatin Packaging

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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Chromatin Packaging01:32

Chromatin Packaging

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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Related Experiment Video

Updated: Mar 8, 2026

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Imaging chromatin nanostructure with binding-activated localization microscopy based on DNA structure fluctuations.

Aleksander Szczurek1, Ludger Klewes2, Jun Xing1

  • 1Institute of Molecular Biology, 55128 Mainz, Germany.

Nucleic Acids Research
|January 14, 2017
PubMed
Summary

This study introduces a new Single Molecule Localization Microscopy (SMLM) method called fluctuation-assisted BALM (fBALM) for precise chromatin nanostructure analysis. This technique enables high-resolution imaging of nuclear architecture, aiding in understanding disease-related aberrations.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Microscopy

Background:

  • Advanced light microscopy is crucial for analyzing chromatin nanostructures.
  • Current methods face limitations in resolving nanoscale details of nuclear architecture.

Purpose of the Study:

  • To present a novel Single Molecule Localization Microscopy (SMLM) concept for super-resolved imaging of DNA-binding dyes.
  • To develop a method for analyzing nanoscale differences in nuclear architecture, particularly in pathological conditions.

Main Methods:

  • Developed a variation of binding-activated localization microscopy (BALM), termed DNA structure fluctuation-assisted BALM (fBALM).
  • Modified DNA properties and DNA-binding dyes, controlling fluorescence signals via reversible DNA melting and hybridization.
  • Utilized intercalating and minor-groove binding DNA dyes for transient binding and signal isolation.

Main Results:

  • Demonstrated the ability to optically isolate and image a few DNA-binding dye signals at a time.
  • Achieved nanoscale resolution (approx. 50 nm) in imaging nuclear architecture.
  • Successfully applied fBALM to measure nanoscale differences in nuclear architecture in a model of ischemia.

Conclusions:

  • fBALM offers a promising approach for enhanced microscopic analysis of chromatin nano-architecture.
  • This technique may facilitate the study of nuclear structure aberrations in various pathological conditions.
  • Potential applications include analyzing nanostructural differences across cell types, developmental stages, or under environmental stress.