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Delayed ovulation and monozygotic twinning.

O Bomsel-Helmreich, E Papiernik-Berkhauer

    Acta Geneticae Medicae Et Gemellologiae
    |January 1, 1976
    PubMed
    Summary
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    Delayed ovulation in rabbits induced monozygotic (MZ) twinning. This hormonal treatment also led to increased embryonic mortality and chromosomal anomalies, potentially mirroring issues seen in human MZ twins.

    Area of Science:

    • Reproductive biology
    • Developmental biology
    • Genetics

    Background:

    • Monozygotic (MZ) twinning is rare in rabbits.
    • Delayed ovulation is hypothesized to influence twinning.
    • Egg quality may be affected by ovulation timing.

    Purpose of the Study:

    • To investigate if delayed ovulation can induce MZ twinning in rabbits.
    • To assess the impact of this induction method on embryonic development and chromosomal integrity.

    Main Methods:

    • Follicular maturation was induced using Pregnant Mare Serum Gonadotropin.
    • Ovulation was artificially delayed by 60 hours post-hormone injection.
    • Blastocysts were analyzed for twinning, mortality, and chromosomal abnormalities.

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    Main Results:

    • A low incidence (1.5%) of MZ twins was observed following delayed ovulation.
    • Embryonic mortality rate was significantly higher (62%) compared to controls (27%).
    • Chromosomal anomalies, including trisomies and triploidies, were present in 20% of embryos.

    Conclusions:

    • Delayed ovulation can induce monozygotic twinning in rabbits.
    • The method also resulted in adverse effects on embryo quality, including increased mortality and chromosomal aberrations.
    • These findings may offer insights into the developmental challenges faced by human MZ twins.