Ta. Wilkinson et al., A CASE OF MATERNAL UNIPARENTAL DISOMY OF CHROMOSOME-9 IN ASSOCIATION WITH CONFINED PLACENTAL MOSAICISM FOR TRISOMY-9, Prenatal diagnosis, 16(4), 1996, pp. 371-374
We describe the first case of maternal uniparental disomy (UPD) of chr
omosome 9 in a fetus who was shown to have mosaic trisomy 9 in a chori
onic villus sample. Karyotyping and molecular studies following termin
ation of the pregnancy confirmed mosaicism in the placenta and materna
l UPD(9) in the fetal tissues. This case demonstrates that the mechani
sm of trisomy correction may result in a fetus with UPD(9).