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Related Experiment Videos

Synaptonemal complexes at premeiotic interphase in the mouse spermatocyte.

R F Grell, E F Oakberg, E E Generoso

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1980
    PubMed
    Summary

    Synaptonemal complexes, crucial for meiosis, were observed forming during the S phase in male mice spermatocytes. This finding challenges traditional views on the timing of homologous chromosome pairing during meiosis.

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    Genomics·1996

    Area of Science:

    • Cell Biology
    • Genetics
    • Reproductive Biology

    Background:

    • Meiosis is a fundamental process for sexual reproduction.
    • The precise timing of homologous chromosome synapsis during meiosis has been a subject of study.
    • Spermatogenesis involves distinct stages of germ cell development in males.

    Purpose of the Study:

    • To investigate the timing of synaptonemal complex formation during meiosis.
    • To examine the relationship between DNA replication (S phase) and homologous chromosome pairing.
    • To clarify the early events in spermatocyte development.

    Main Methods:

    • Male mice were administered [3H]thymidine to label DNA synthesis.
    • Testes were analyzed using bright-field and electron microscopic autoradiography.

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  • Primary spermatocytes at the premeiotic interphase were identified and examined.

    • Main Results:

    • Primary spermatocytes in premeiotic interphase showed significant [3H]thymidine labeling, indicating DNA synthesis.
    • Electron microscopy revealed synaptonemal complexes and DNA label within the same nuclei.
    • Homologous chromosome synapsis was observed to occur concurrently with the S phase.

    Conclusions:

    • Homologous chromosome synapsis begins during the S phase of the cell cycle in male mice.
    • This finding suggests a revised understanding of the temporal events in meiosis.
    • Early synapsis may have implications for genetic recombination and chromosomal integrity.