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Meiotic pairing and gametogenic failure.

P S Burgoyne, T G Baker

    Symposia of the Society for Experimental Biology
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Chromosomal anomalies in males disrupt spermatogenesis by causing unpaired chromosome segments during pachytene, leading to cell loss. A common mechanism likely removes these gametogenic cells, affecting both male and female fertility.

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    Area of Science:

    • Reproductive biology
    • Genetics
    • Cell biology

    Background:

    • Spermatogenic impairment in males is linked to various chromosomal anomalies like XYY trisomy and XO monosomy with sex reversal.
    • A common feature of these anomalies is the presence of unpaired chromosome segments during pachytene, a critical stage in meiosis.

    Purpose of the Study:

    • To investigate a potential common mechanism underlying spermatogenic failure in males with chromosomal anomalies.
    • To analyze meiotic data and reconcile observations in XYY and XO mice regarding gametogenic cell loss.

    Main Methods:

    • Analysis of meiotic data from male mice with chromosomal anomalies (e.g., XYY, XO Sxr).
    • Examination of oogenic failure in female XO mice.
    • Comparison of meiotic progression and cell survival rates across different anomalies.

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    Main Results:

    • Unpaired chromosome segments at pachytene correlate with failure to reach metaphase II in XYY mice.
    • XO Sxr mice produce diploid round spermatids due to omitted second meiotic division, with subsequent degeneration.
    • Female XO mice exhibit significant oogenic failure (60% reduction) during late pachytene, despite adult fertility.

    Conclusions:

    • A conserved mechanism likely eliminates gametogenic cells with meiotic pairing failures in both sexes.
    • In males, the severity of spermatogenic loss is related to the extent of pachytene pairing failure.
    • In females, this mechanism is less efficient, allowing sufficient oocyte survival for fertility.