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  • Title: Maternal uniparental disomy for chromosome 22 in a child with generalized mosaicism for trisomy 22.
    Author: de Pater JM, Schuring-Blom GH, van den Bogaard R, van der Sijs-Bos CJ, Christiaens GC, Stoutenbeek P, Leschot NJ.
    Journal: Prenat Diagn; 1997 Jan; 17(1):81-6. PubMed ID: 9021833.
    Abstract:
    We report on a case of generalized mosaicism for trisomy 22. At chorionic villus sampling (CVS) in the 37th week of pregnancy, a 47,XX,+22 karyotype was detected in all cells. The indication for CVS was severe unexplained symmetrical intrauterine growth retardation (IUGR) and a ventricular septal defect (VSD) was noted. In cultured cells from amniotic fluid taken simultaneously, only two out of ten clones were trisomic. At term, a growth-retarded girl with mild dysmorphic features was born. Lymphocytes showed a normal 46,XX[50] karyotype; both chromosomes 22 were maternal in origin (maternal uniparental disomy). Investigation of the placenta post-delivery using fluorescence in situ hybridization showed a low presence of trisomy 22 cells in only one out of 14 biopsies. In cultured fibroblasts of skin tissue, a mosaic 47,XX,+22[7]/46,XX[25] was observed. Clinical follow-up is given up to 19 months.
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