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Related Experiment Videos

Imaging and manipulating chromosomes with the atomic force microscope

D M Jondle1, L Ambrosio, J Vesenka

  • 1Department of Zoology and Genetics, Iowa State University, Ames 50011, USA.

Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology
|June 1, 1995
PubMed
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Atomic force microscopy (AFM) offers high-resolution imaging of Drosophila melanogaster polytene chromosomes. Specialized tips enable precise dissection of chromosomal regions for genetic mapping applications.

Area of Science:

  • Cytogenetics
  • Nanotechnology
  • Biophysics

Background:

  • Polytene chromosomes in Drosophila melanogaster salivary glands are valuable models for studying chromosome structure.
  • Conventional optical microscopy has limitations in resolving fine chromosomal details.

Purpose of the Study:

  • To investigate the utility of atomic force microscopy (AFM) for high-resolution imaging and manipulation of Drosophila melanogaster polytene chromosomes.
  • To evaluate different AFM tip types for optimizing resolution and minimizing sample damage.

Main Methods:

  • Examination of Drosophila melanogaster polytene chromosomes using atomic force microscopy (AFM).
  • Comparison of pyramidal-shaped tips, electron beam deposited (EBD) tips, and oxide-sharpened tips for resolution and sample integrity.

Related Experiment Videos

  • Utilizing oxide-sharpened tips for precise dissection of chromosomal regions.

    • Main Results:

    • AFM achieved resolutions of approximately 500 A with pyramidal tips and 300 A with EBD tips, surpassing optical microscopy.
    • Oxide-sharpened tips provided high resolution without sample degradation, and enabled controlled sample dissection.
    • Demonstrated precise dissection of specific chromosomal regions using AFM.

    Conclusions:

    • AFM is a powerful tool for high-resolution characterization of polytene chromosomes.
    • Oxide-sharpened AFM tips offer a balance of resolution and sample manipulation capabilities.
    • AFM has significant potential for applications in genetic mapping and chromosome analysis.