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Related Experiment Videos

Autonomous cortical activity in mouse eggs controlled by a cytoplasmic clock.

M Waksmundzka, E Krysiak, J Karasiewicz

    Journal of Embryology and Experimental Morphology
    |February 1, 1984
    PubMed
    Summary

    Mouse egg halves show autonomous cortical activity, independent of the nucleus, suggesting a cytoplasmic clock regulates these events. The presence of a nucleus moderates this activity.

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    Area of Science:

    • Cell Biology
    • Developmental Biology
    • Reproductive Biology

    Background:

    • Cortical activity in oocytes is crucial for early embryonic development.
    • The role of the nucleus in regulating cortical activity is not fully understood.

    Purpose of the Study:

    • To investigate the autonomous nature of cortical activity in mouse eggs.
    • To determine the influence of the nucleus on cortical activity and egg fragmentation.

    Main Methods:

    • Bisecting mouse eggs (parthenogenetic and fertilized) into nucleate and anucleate halves.
    • Observing egg halves in vitro for cortical activity manifestations.
    • Utilizing heat shock and ethyl alcohol for egg activation.

    Main Results:

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    • Anucleate egg halves exhibited autonomous cortical activity, including surface undulations and fragmentation.
    • Fragmentation in anucleate halves was partially or completely reversible in 20% of cases.
    • The presence of a nucleus (pronucleus or second polar body) moderated cortical activity, reducing fragmentation intensity.

    Conclusions:

    • Cortical activity initiation is nucleus-independent, indicating autonomous regulation by a cytoplasmic clock.
    • The nucleus exerts a moderating influence on the intensity and reversibility of cortical activity.
    • These findings shed light on the fundamental mechanisms governing early oocyte development.