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Related Experiment Videos

Human chromosomes: evaluation of processing techniques for scanning electron microscopy

O H Sanchez-Sweatman1, E P de Harven, I D Dubé

  • 1Department of Pathology, University of Toronto, Canada.

Scanning Microscopy
|March 1, 1993
PubMed
Summary

Scanning electron microscopy (SEM) offers higher resolution for human chromosome studies. A refined SEM preparation method using tannic acid-mediated osmium impregnation improves reproducibility and detects fragile sites more sensitively than light microscopy.

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Area of Science:

  • Cytogenetics
  • Microscopy
  • Cell Biology

Background:

  • Scanning electron microscopy (SEM) has potential for high-resolution chromosome analysis.
  • Technical challenges have limited routine SEM application in human cytogenetics.

Purpose of the Study:

  • To compare different SEM preparation techniques for human chromosomes.
  • To establish a reproducible SEM protocol for enhanced chromosomal imaging.
  • To evaluate the sensitivity of the developed SEM method for detecting fragile sites.

Main Methods:

  • Comparison of metal impregnation, air drying, and specimen coating methods.
  • Optimization of osmium impregnation using tannic acid.
  • Evaluation of osmium impregnation via backscattered electron imaging.

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  • Critical point drying and gold-palladium coating for secondary electron imaging.

    • Main Results:

    • Tannic acid-mediated osmium impregnation yielded more reproducible SEM results for human chromosomes.
    • Critical point drying and gold-palladium coating were crucial for optimal imaging.
    • The developed SEM technique demonstrated higher sensitivity than light microscopy for detecting aphidicolin-induced fragile sites.

    Conclusions:

    • This optimized SEM protocol enhances reproducibility and resolution for human chromosome studies.
    • The technique allows for the analysis of clinical and archival cytogenetic samples.
    • SEM provides a valuable tool for chromosomal research requiring resolution beyond light microscopy capabilities.