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Related Experiment Video

Updated: Jun 25, 2026

Visualization of Recombinant DNA and Protein Complexes Using Atomic Force Microscopy
08:30

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Published on: July 18, 2011

Visualization of cellular DNA crosslinks by atomic force microscopy.

Kun Zhang1, Hao Qi, Hao Li

  • 1Institute of Photonics and Photon-Technology, Northwest University, Xi'an, People's Republic of China.

Scanning
|February 26, 2009
PubMed
Summary

Atomic force microscopy (AFM) effectively visualizes cellular DNA crosslinks, a critical DNA damage type. This direct imaging method differentiates DNA damage, offering a valuable alternative to indirect assays for toxic chemical and radiation exposure studies.

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Area of Science:

  • Cellular Biology
  • Biophysics
  • Toxicology

Background:

  • Cellular DNA crosslinks are a significant form of DNA damage.
  • Failure to repair DNA damage can lead to cell death or mutations.
  • Accurate detection of DNA crosslinks is crucial for understanding cellular responses to toxic agents.

Purpose of the Study:

  • To evaluate DNA damage types and their impact on cellular functions.
  • To explore the utility of direct morphological observation for DNA damage detection.
  • To demonstrate atomic force microscopy (AFM) as a method for visualizing DNA crosslinking.

Main Methods:

  • Utilized atomic force microscopy (AFM) to visualize DNA strand breakage and crosslinking.
  • Treated cells with varying concentrations of formaldehyde and hydrogen peroxide.
  • Compared AFM observations with results from comet assays.

Main Results:

  • AFM successfully visualized DNA crosslinking induced by toxic chemicals.
  • Chemical-induced DNA crosslinking demonstrated a dose-dependent relationship.
  • Observed DNA conglomerates at high formaldehyde concentrations, consistent with comet assay findings.

Conclusions:

  • Atomic force microscopy (AFM) is an efficient tool for direct visualization of cellular DNA damage.
  • AFM can effectively differentiate between types of DNA damage, including crosslinking.
  • This technique offers a valuable approach for studying the effects of toxic chemicals and radiation on DNA integrity.