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Tetraploid conceptus with three paternal contributions

D M Sheppard, R A Fisher, S D Lawler

    Human Genetics
    |January 1, 1982
    PubMed
    Summary
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    This study used genetic polymorphisms to investigate a tetraploid conceptus. Findings suggest a trispermic origin, with one maternal and three paternal genetic contributions.

    Area of Science:

    • Reproductive Biology
    • Genetics
    • Developmental Biology

    Background:

    • Determining the origin of polyploid conceptuses is crucial for understanding early human development.
    • Cytogenetic and biochemical polymorphisms offer valuable tools for genetic lineage tracing.

    Purpose of the Study:

    • To elucidate the origin of a specific tetraploid conceptus.
    • To differentiate between abnormal zygote cleavage and alternative fertilization events.

    Main Methods:

    • Analysis of cytogenetic polymorphisms across multiple chromosomes (1, 6, 9, 15, 16, 22, and sex chromosomes).
    • Assessment of biochemical polymorphisms to identify genetic contributions.
    • Comparison of observed genetic makeup with expected patterns from different developmental anomalies.

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    Main Results:

    • Genetic polymorphisms were identified in several chromosomes, including sex chromosomes.
    • The conceptus exhibited one maternal and three paternal genetic contributions.
    • The observed pattern is inconsistent with a failure of cytokinesis during the first zygotic division.

    Conclusions:

    • The tetraploid conceptus likely resulted from trispermic fertilization (fertilization by three sperm).
    • This finding provides critical insight into non-standard fertilization events leading to polyploidy.
    • Understanding such origins is essential for reproductive medicine and genetic counseling.