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Related Experiment Videos

Localization of the synaptonemal complex under the light microscope

P Esponda, J C Stockert

    Chromosoma
    |August 21, 1978
    PubMed
    Summary
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    Researchers developed a new method to visualize the synaptonemal complex (SC) in cells. This technique uses osmium tetroxide and p-phenylenediamine, enabling clear observation of SC structures under light and electron microscopes.

    Area of Science:

    • Cell Biology
    • Microscopy Techniques
    • Genetics

    Background:

    • The synaptonemal complex (SC) is crucial for genetic recombination during meiosis.
    • Visualizing the SC under light microscopy has been challenging due to its fine structure.

    Purpose of the Study:

    • To develop a reliable method for visualizing the synaptonemal complex (SC) using light microscopy.
    • To characterize the staining properties of the SC with a novel fixation and post-treatment technique.

    Main Methods:

    • Osmium tetroxide fixation followed by p-phenylenediamine post-treatment of mouse testes and Allium cepa anthers.
    • Observation of semi-thin sections using phase contrast and dark field microscopy.
    • Post-staining with ammoniacal silver for bright field microscopy and examination of ultrathin sections with electron microscopy.

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    Main Results:

    • Fine threads, identified as the SC, were clearly visible in pachytene nuclei under light microscopy.
    • Ammoniacal silver staining enhanced SC contrast for bright field observation.
    • Electron microscopy confirmed preferential staining of SC elements, leaving surrounding chromatin unstained.

    Conclusions:

    • The combined osmium tetroxide and p-phenylenediamine technique effectively visualizes the synaptonemal complex (SC) under light microscopy.
    • This method provides enhanced contrast and clear visualization of SC structures, aiding in cytogenetic studies.
    • The technique's specificity for SC elements makes it valuable for electron microscopy as well.