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Related Experiment Videos

Sperm-oocyte interaction in the sea-urchin.

B Dale, L Santella

    Journal of Cell Science
    |March 1, 1985
    PubMed
    Summary

    Sea urchin fertilization involves two key electrical events. Sperm-egg fusion causes initial depolarization, followed by a second event triggering sperm entry and egg activation.

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    Zygote (Cambridge, England)·2013

    Area of Science:

    • Reproductive Biology
    • Cellular Electrophysiology

    Background:

    • Understanding the early events of fertilization is crucial for reproductive biology.
    • Sea urchin oocytes provide a model system for studying gamete interaction.

    Purpose of the Study:

    • To investigate the electrical and morphological changes in sea urchin oocytes during sperm interaction.
    • To elucidate the mechanisms underlying sperm fusion, entry, and egg activation.

    Main Methods:

    • Electrophysiological recordings of oocyte membrane potential and resistance.
    • Time-lapse microscopy to observe morphological changes and sperm incorporation.

    Main Results:

    • A rapid, small depolarization and decreased input resistance occur upon sperm attachment, attributed to sperm-oocyte fusion.
    • A secondary event at approximately 50 seconds, likely involving soluble factors from sperm, leads to sperm incorporation and protrusion formation.
    • These electrical and morphological changes are compared to known events of egg activation.

    Conclusions:

    • Fertilization in sea urchins involves distinct electrical events initiating and completing sperm incorporation.
    • The sperm plasma membrane plays a role in the initial electrical changes during fusion.
    • A soluble sperm component is implicated in the determinative event of sperm entry and subsequent egg activation.

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