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Related Experiment Video

Updated: Feb 15, 2026

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
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MEIOTIC ARREST IN OOCYTES REGULATED BY A SPISULA FACTOR.

E Sato, H N Wood, D G Lynn

    The Biological Bulletin
    |January 10, 2018
    PubMed
    Summary

    A novel substance from Spisula tissues halts meiotic arrest in mouse, Spisula, and Chaetopterus oocytes. This finding reveals a conserved mechanism maintaining oocyte meiotic arrest across species.

    Area of Science:

    • Reproductive Biology
    • Developmental Biology
    • Molecular Biology

    Background:

    • Ovarian oocytes in mice, Spisula, and Chaetopterus naturally arrest at the dictyate stage of meiotic prophase.
    • Upon isolation, mouse and Chaetopterus oocytes mature spontaneously, while Spisula oocytes remain arrested.

    Purpose of the Study:

    • To identify and characterize a substance from Spisula with meiotic arresting activity.
    • To investigate the role of this substance in maintaining meiotic arrest in oocytes from different species.

    Main Methods:

    • Purification of the meiotic arresting substance from Spisula tissues using ethanol extraction, Dowex chromatography, and reversed-phase HPLC.
    • Assay of the substance's effect on oocyte maturation (germinal vesicle breakdown - GVBD) induced by various stimuli (sperm, serotonin, KCl) in Spisula, Chaetopterus, and mouse oocytes.

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  • Comparison of the activity of the Spisula substance with known meiotic regulators like forskolin, IBMX, dbcAMP, and dbcGMP.

    • Main Results:

    • A substance isolated from Spisula tissues demonstrated meiotic arresting activity in Spisula, Chaetopterus, and mouse oocytes.
    • The Spisula extract inhibited serotonin-induced maturation in Spisula oocytes and maturation in Chaetopterus oocytes.
    • The purified Spisula factor, in combination with dibutyryl cyclic adenosine monophosphate (dbcAMP), blocked spontaneous maturation of mouse oocytes.
    • Cyclic guanosine monophosphate (cGMP) appeared to be a key factor in maintaining meiotic arrest in Chaetopterus oocytes.

    Conclusions:

    • A conserved substance present in Spisula tissues plays a crucial role in sustaining meiotic arrest across diverse oocyte species.
    • This Spisula factor, potentially acting in conjunction with cyclic nucleotides like cGMP, represents a significant mechanism for regulating oocyte meiotic progression.