A fluorescent in situ hybridization analysis of the chromosome constitution of ejaculated sperm in a 47,XYY male.

Abstract:

:Two semen samples from a 47,XXY male were examined using chromosome-specific DNA probes and fluorescent in situ hybridization (FISH) to determine the distribution of sex chromosomes and an autosome (chromosome 17) in the sperm. A motile population of sperm was also prepared from one sample using the swim-up technique to compare the motile and total sperm populations. Chromosomes were localized using single FISH and a biotinylated chromosome 17 probe (TR17), or double FISH using a biotinylated X chromosome probe (TRX) and a digoxigenin-labelled Y chromosome probe (HRY). Labelling efficiencies were 95-98%. Ploidy levels were estimated by measurement against a microscope eye-piece graticule. The overall ratio of X- to Y-bearing sperm was 47% to 48.4% in the neat samples, and 48.4% to 45.3% in the swim-up fraction. Neither of the ratios was significantly different from 1:1. The frequencies of monosomic and disomic (but otherwise haploid sperm) were not different from the frequencies we observed in normal donors. In contrast, the frequencies of both diploid and tetraploid cells were increased in the neat samples of the XYY male. In the swim-up fractions, however, none of these parameters differed from those of ten normal semen donors. These results support the hypothesis that the extra Y chromosome in XYY men is eliminated during spermatogenesis.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Han TH,Ford JH,Flaherty SP,Webb GC,Matthews CD

doi

10.1111/j.1399-0004.1994.tb03996.x

subject

Has Abstract

pub_date

1994-02-01 00:00:00

pages

67-70

issue

2

eissn

0009-9163

issn

1399-0004

journal_volume

45

pub_type

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