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Increased nuchal translucency with normal karyotype: a follow‐up study of 100 cases supplemented with CGH and MLPA analyses
Author(s) -
Schou K. V.,
Kirchhoff M.,
Nygaard U.,
Jørgensen C.,
Sundberg K.
Publication year - 2009
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1002/uog.7468
Subject(s) - multiplex ligation dependent probe amplification , medicine , karyotype , obstetrics , turner syndrome , pregnancy , subtelomere , prenatal diagnosis , aneuploidy , fetus , gynecology , pediatrics , chromosome , genetics , biology , exon , gene
Objective To evaluate whether high‐resolution comparative genomic hybridization (HR‐CGH) and subtelomeric and syndrome‐specific multiplex ligation‐dependent probe amplification (MLPA) would detect minor chromosomal aberrations in fetuses with increased nuchal translucency thickness (NT) and normal karyotype on conventional karyotyping. Methods Chorionic villus samples from 100 fetuses with NT ≥ 99 th percentile and normal G‐banding analysis and MLPA for detection of aneuploidies for chromosomes 13, 18, 21, X and Y were included. Examinations were supplemented by HR‐CGH and MLPA for syndromes and subtelomeric regions. Pregnancy outcome was followed up. Results Among 80 liveborn children who were followed up, three (4%) had syndromes involving mental retardation, including a case of Sotos syndrome caused by a de novo mutation. 15% of fetuses were lost during pregnancy due to abnormalities and termination. The rate of adverse outcome overall was 18%. HR‐CGH and MLPA did not detect any chromosomal aberrations associated with the syndromes. Conclusion The rate of adverse outcome was similar to levels recorded in the literature. Using CGH and MLPA did not increase the detection rate of genetic disease, which supports the current approach of repeated ultrasound examinations in these high‐risk pregnancies. Copyright © 2009 ISUOG. Published by John Wiley & Sons, Ltd.