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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1986 May;38(5):751–758.

Quantitative analysis of sex-chromosome mosaicism with X-Y DNA probes.

C M Disteche, H Saal, C Friedman, V Sybert, H Thuline
PMCID: PMC1684831  PMID: 3755007

Abstract

Sex-chromosome mosaicism was quantitatively analyzed in two patients using DNA probes specific for human X and Y chromosomes. Both patients were female with stigmata of the Turner syndrome, and both had a 45,X cell line and a 46,XY cell line. One of the patients had a morphologically abnormal, nonfluorescent Y chromosome, dic(Y)(q11). Hybridization of DNA from this patient with two repetitive DNA sequences specific for the heterochromatic region of the Y chromosome indicated that most of the Y-heterochromatic sequences were deleted. DNA from both patients was hybridized with a probe for the DXYS1 locus and found to have the X- and Y-linked loci. Densitometric measurements of the relative intensities of the X- and Y-linked bands were used to calculate the degree of mosaicism in each case. The percentages of 45,X cells obtained by DNA analysis agreed with those obtained by chromosome analysis. DNA analysis provides a way to quantitate mosaicism at the DNA level and in nondividing tissue.

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Selected References

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