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Mosaic dup (9p) diagnosed by fluorescence in situ hybridization (FISH)

✍ Scribed by Petty, Elizabeth M. ;Gibson, Lisa H. ;Breg, W. Roy ;Burns, Jacqueline P. ;Yang-Feng, Teresa L.

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 715 KB
Volume: 45
Category: Article
ISSN: 0148-7299
DOI: 10.1002/ajmg.1320450622

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✦ Synopsis

We describe a girl with some manifestations of the dup (9p) syndrome. High-resolution Giemsa-banded karyotype of her lymphocytes documented that she was mosaic with 80% of cells being 46,XX, and 20% 46,XX,-20, + der(%O;?) (p13;?). The additional material on 20p could not be defined clearly hy high-resolution Giemsa banding, as the banding pattern appeared consistent with either distal 9p or distal 13q. In order to make a definitive cytogenetic diagnosis, we used fluorescence in situ hybridization (FISH) with a chromosome 9 specific DNA lilbrary to establish that the origin of the additional chromosomal material on chromosome 20 was from 9p. FISH used in this situation enabled us to counsel the family specifically regarding the prog nosis and manifestatioins of distal 9p duplication.

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