Y-190, a DNA probe for the sensitive detection of Y-derived marker chromosomes and mosaicism.

A DNA probe (Y-190) is described that specifically hybridizes with repeated DNA sequences in the short arm of the human Y chromosome. The suitability of Y-190 to detect Y-derived DNA is shown in two patients with a 45,X/46,X+ marker karyotype and in a third patient previously described as having a 45,X karyotype.