Three cases of 45,X/46,XYnf mosaicism. Molecular analysis revealed heterogeneity of the nonfluorescent Y chromosome.

Abstract:

:Three patients with 45,X/46,XYnf mosaicism were investigated by Southern hybridization using both X- and Y-specific DNA probes. Our patients seem to be hemizygous for the X chromosomal loci tested. Single-copy and low-copy repeated Y chromosomal sequences assigned to the short arm, centromere, and euchromatin of the long arm have been detected in our patients, suggesting the Y chromosomal origin of the marker chromosome both in male and female cases studied. Densitometry of autoradiographs revealed a double dose of Yp-specific fragments of the DXYS1 locus. None of the patients tested showed either the 3.4- or the 2.1-kb Hae III male-specific repeated DNA sequences. It seems likely that the Ynf is a pseudodicentric chromosome with duplication of Yp and euchromatic Yq sequences, the Yq heterochromatin being lost. Our findings indicate structural heterogeneity of the marker chromosome and in addition provide further information on the relative position of DNA sequences detected by DNA probes 50f2, M1A, and pDP105.

journal_name

Hum Genet

journal_title

Human genetics

authors

Gänshirt-Ahlert D,Pawlowitzki IH,Gal A

doi

10.1007/BF00284913

subject

Has Abstract

pub_date

1987-06-01 00:00:00

pages

153-6

issue

2

eissn

0340-6717

issn

1432-1203

journal_volume

76

pub_type

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