Coexistence of inverted Y, chromosome 15p+ and abnormal phenotype.
In this study, we report conventional and molecular cytogenetic studies in a patient with multiple anomalies who is a carrier of a pericentric inversion on chromosome Y and a chromosome 15p+. His parents were phenotypically normal. The father is a carrier of a pericentric inversion of chromosome Y, and the mother carries a large chromosome 15p+ variant. The inverted Y chromosome was demonstrated by GTG- and CBG-banding, and DAPI-staining. The presence of extra chromosomal material on the chromosome 15p, that was C-band and DAPI positive, was demonstrated by trypsin G-banding. This suggests that the extra chromosomal material contained repetitive DNA sequences. NOR-staining indicated the presence a nuclear organizer region at the junction of the chromosome 15p+ material. Fluorescence in situ hybridization (FISH), with chromosome X and Y painting probes, alpha- and classic-satellite probes specific for chromosome Y, alpha- and beta-satellite III probes for chromosome 15 were used to elucidate the nature of both the inverted Y chromosome and chromosome 15p+. The result with chromosome X and Y painting probes, alpha-satellite, classic-satellite, and DYS59 probes specific for chromosome Y revealed the rearrangement of the Y chromosome was an inv(Y)(p11.2q11.22 or q11.23). FISH with alpha-satellite and beta-satellite III probes for chromosome 15 demonstrated that the extra chromosomal material on the chromosome 15 probably represents beta-satellite III sequences. The possible roles of the simultaneous occurrence of an inverted Y and the amplified DNA sequence on chromosome 15p in the abnormal phenotype of the proband are discussed.
Department of Medical Genetics, Selçuk University, Medical Faculty, Konya-Türkiye.
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D002869:Chromosome Aberrations / Q000235:genetics; D025063:Chromosome Disorders; D007446:Chromosome Inversion; D002884:Chromosomes, Human, Pair 15 / Q000235:genetics*; D003582:Cytogenetics / Q000379:methods; D015342:DNA Probes / Q000235:genetics; D004276:DNA, Satellite / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D008297:Male; D010641:Phenotype; D014998:Y Chromosome / Q000235:genetics*
D015342:DNA Probes; D004276:DNA, Satellite