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A case of prenatal detection of a de novo unbalanced complex chromosomal rearrangement involving four chromosomes

Author:
Pylyp, L. Y., Mykytenko, D. O., Spinenko, L. O., Lavrova, K. V., Verhoglyad, N. V., Zukin, V. D.
Source:
Cytology and genetics 2016 v.50 no.5 pp. 339-342
ISSN:
0095-4527
Subject:
amniotic fluid, chromosome elimination, chromosomes, comparative genomic hybridization, cytogenetic analysis, heterozygosity, pregnancy
Abstract:
Complex chromosomal rearrangements are rarely observed prenatally. Genetic counceling of CCR carriers is complicated, especially in cases of de novo origin of the rearrangement. Here we present a new case of a de novo CCR involving four chromosomes observed in amniotic fluid cells of the fetus at 17 weeks of gestation. The rearrangement was characterized as an apparently balanced four-way trans-location t(1;11;7;13)(~p21;~q13.5;~q32;~q22)dn by conventional cytogenetic studies. However, array-based comparative genomic hybridization revealed 5 submicroscopic heterozygous interstitial deletions on chromosome 1, 11, 7, 13 with a total loss of 21.1 Mb of genetic material in regions close to those, designated as breakpoints by conventional cytogenetic analysis. The described case clearly illustrates that high-resolution molecular genetic analysis should be combined with conventional cytogenetic techniques to exclude subtle chromosomal abnormalities in CCR cases detected prenatally.
Agid:
5559621