The meiotic chromosomes of man View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1965-11

AUTHORS

Motomichi Sasaki, Sajiro Makino

ABSTRACT

Information was obtained on the chromosome number, and the behavior of autosomes as well as of the sex chromosomes in meiosis in human male germ cells derived from 25 Japanese patients, 4 to 79 years in age, who were hospitalized mostly due to epididymitis, prostate cancer, undescended testes or infertility. In 16 out of the 25 specimens, the chromosome numbers, 46 in 2n and 23 in n, were consistently established together with an XY sex-determining mechanism based on spermatogonial and spermatocyte divisions. No reliable counts were obtained from the remaining 9 cases, because of that they provided no cells for precise investigation. The X and Y chromosomes during the leptotene stage were observed as two separate heteropycnotic bodies lying along the inner wall of the nucleus, while at pachytene they formed a sex-vesicle after homologous pairing. At the diplotene, diakinesis and first metaphase the X and the Y appeared as an isopycnotic bivalent showing an end-to-end association, though there were some cells in which they remained as two separate entities free from contact. Evidence was presented that the X and the Y seemed to associate with each other at the distal end of the short arm of each element. One or sometimes two smallest autosomal bivalents tended to show rather precociously a chiasma-terminalization at the first metaphase. The metaphase chromosomes of the second spermatocytes were evident by the haploid number as well as by their widely diverged chromatids with a characteristic spiral configuration. The testicular materials under study contained in most cases polyploid cells with a considerable frequency in spermatogonia as well as in first and second spermatocytes. Giant sperm heads were observed not infrequently, mostly being abnormal in shape. No significant correlation was obtained between the frequency of polyploid cells and the age of patients so far studied. More... »

PAGES

637-651

References to SciGraph publications

  • 1956-05. THE CHROMOSOME NUMBER OF MAN in HEREDITAS
  • 1956-11. The Chromosomes of Man in NATURE
  • 1962-03. A further survey of the chromosomes in the Japanese in CHROMOSOMA
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00285113

    DOI

    http://dx.doi.org/10.1007/bf00285113

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1012908325

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/4379665


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