Prenatal diagnosis of a double bisatellited marker with an unusual copy number ratio
- 1 October 1990
- journal article
- case report
- Published by Wiley in Prenatal Diagnosis
- Vol. 10 (10), 677-681
- https://doi.org/10.1002/pd.1970101008
Abstract
Prenatal diagnosis, by amniocentesis, revealed mosaicism with respect to a bisatellited, apparently dicentric, DA/DAPI positive, de novo marker. The following cell lines were observed in decreasing order of frequency: 46,XX > 48.XX, + mar, + mar » 47,XX, + mar. The pregnancy was terminated and post‐mortem examination revealed an apparently normal fetus. Cytogenetic studies of fetal and placental tissues revealed approximately the same level of mosaicism together with the unusual copy number ratio seen in the amniotic fluid cultures. Non‐disjunction at the first post‐zygotic mitotic division giving rise to a mosaic: 46,XX/ 48,XX, + mar, + mar followed by subsequent mitotic instability of the marker could account for the unusual copy number ratio.Keywords
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