Abstract
Sperm nuclei from eight normal, healthy donors were hybridized in situ with the biotin-labeled Y-specific pHY2.1 DNA probe to evaluate the X:Y ratio, the location of the Y chromosome, and the frequency of Y aneuploidy in human sperm. The streptavidine-horseradish-peroxidase and DAB detection system used permitted the unequivocal identification of sperm heads with zero, one, or two hybridization signals and proved superior to either quinacrine staining or radioactive in situ hybridization. The low incidence of 0.27% of sperm nuclei with two Y chromosomes that was found is similar to the frequency of XYY males among newborns. The average proportions of X- and Y-bearing sperm nuclei were 50.3% and 49.4%, respectively, corresponding to the expected 1:1 ratio. The Y heterochromatin was located in the central part of the nucleus in 58% of the Y-carrying sperm cells.
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