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Oogenesis in antenatal development in man

L F Kurilo

    Human Genetics
    |January 1, 1981
    PubMed
    Summary

    This study details early human female germ cell development, mapping oocyte stages and follicle formation chronologically from 6 to 40 weeks. It reveals key timelines for oocyte maturation and follicle genesis during prenatal development.

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    Area of Science:

    • Reproductive Biology
    • Developmental Biology
    • Human Embryology

    Background:

    • Understanding early oogenesis is crucial for reproductive health.
    • The precise timing of germ cell development and follicle formation in human embryos is not fully elucidated.

    Purpose of the Study:

    • To quantitatively analyze germ cell development, ovarian mitotic activity, and oocyte chromosome dynamics during human embryonic and fetal development (6-40 weeks).
    • To establish the chronology of oocyte stages (preleptotene, leptotene, zygotene, pachytene, diplotene, dictyotene) and follicle genesis.
    • To describe the dynamics of germ cell degeneration during intra-uterine development.

    Main Methods:

    • Quantitative analysis of 97 female embryos and fetuses (6-40 weeks gestation).
    • Microscopic examination of germ cell development, oocyte meiotic prophase I stages, and follicle genesis.
    • Assessment of mitotic activity in the ovary and chromosome transformations in oocytes.

    Main Results:

    • Detailed chronology of oocyte development, including preleptotene condensation/decondensation, leptotene (10-11 weeks), zygotene (10.5-11 weeks), pachytene (11.5-13 weeks), diplotene (11.5-12 weeks), and dictyotene (after 16 weeks).
    • Follicle genesis begins after 11-12 weeks, with primary follicle transformation intensifying after 19-20 weeks.
    • Oocyte numbers peak after 26 weeks and decline by 40 weeks; germ cell degeneration is also observed.

    Conclusions:

    • The study provides the first detailed chronology of oocyte dynamics and follicle development in human embryos and fetuses.
    • By birth, most oocytes are in primary follicles, with few in primordial, secondary, or tertiary stages.
    • Germ cell degeneration is a significant process during intra-uterine development.

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