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Reproductive failure and pericentric inversion in man.

O Gabriel-Robez1, C Ratomponirina, M Croquette

  • 1Institut d'Embryologie, Faculté de Médecine, Strasbourg, France.

Andrologia
|November 1, 1987
PubMed
Summary

This study examined a pericentric inversion of chromosome 6 in an infertile man. Electron microscopy revealed synaptic issues in spermatocytes, suggesting a link between autosomal inversions and infertility.

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Area of Science:

  • Human genetics
  • Reproductive biology
  • Cytogenetics

Background:

  • Infertility affects a significant portion of the population, with chromosomal abnormalities being a contributing factor.
  • Pericentric inversions, rearrangements involving the centromere, can lead to reproductive issues due to abnormal segregation during meiosis.
  • Understanding the meiotic behavior of inverted chromosomes is crucial for diagnosing and managing infertility.

Observation:

  • Pachytene stage analysis was performed on an infertile male with a heterozygous pericentric inversion of chromosome 6.
  • Synaptic behavior of the chromosome 6 inversion bivalent was visualized using electron microscopy on silver-stained surface microspreads.
  • Spermatocytes from the inversion-bearing individual were examined to assess meiotic pairing and potential structural abnormalities.

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Findings:

  • The study detailed the synaptic behavior of the chromosome 6 pericentric inversion during pachytene.
  • Electron microscopy provided high-resolution insights into the structure and pairing of the inverted bivalent.
  • Specific synaptic configurations and potential disturbances were observed in the inversion-heterozygous spermatocytes.

Implications:

  • The findings contribute to understanding the mechanisms by which autosomal inversions, specifically chromosome 6 pericentric inversion, can cause male infertility.
  • This research may aid in genetic counseling for individuals with similar chromosomal rearrangements.
  • Further investigation into the sterilizing effects of autosomal inversions can improve reproductive health strategies.