Prenatally diagnosed de novo segmental amplification or deletion by microarray-based comparative genomic hybridization: A retrospective study

Hsiu Huei Peng, Chien Hong Lee, Sheng Yuan Su, Kuan Ju Chen, Yen Chang Lee, Shu Han You, Wen Fang Lee, Po Jen Cheng*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

4 Scopus citations

Abstract

Objective: Prenatal diagnosis of de novo segmental amplification or deletion by microarray-based comparative genomic hybridization (array CGH) is uncommon. The study aimed to know about the incidence, abnormal ultrasound findings, and pregnancy outcomes of prenatally diagnosed de novo segmental amplification or deletion by array CGH. Materials and methods: Between January 2014 and December 2017, we analyzed pregnant women who received prenatal array CGH (SurePrint G3 Human CGH Microarray Kit, 8 × 60K) at Chang Gung Memorial Hospital, Taiwan. Clinical data on maternal age, reason for fetal karyotyping, sonographic findings, gestational age at delivery, newborn birth weight, and associated anomalies, if any, were obtained by chart review. Results: A total of 836 specimens (814 amniotic fluid samples, 4 cord blood samples, 18 chorionic villi samples) were analyzed by array CGH during the study period. Of the 56 cases with abnormal array CGH results, 40 had segmental amplification or deletion, 12 had trisomy, three had monosomy, and one had sex chromosome aneuploidy. Of these 40 cases with segmental amplification or deletion, 30 were inherited and 10 were de novo occurrences. The incidence of de novo segmental amplification or deletion was 1.2% (10/836). Abnormal prenatal ultrasound findings occurred in 40% (4/10) of de novo segmental amplification or deletion cases. Among these 10 pregnancies, nine were voluntarily terminated between 22 and 26 weeks of gestation and one was delivered at term. Conclusions: Prenatal diagnosis of de novo segmental amplification or deletion by array CGH raises important genetic counseling issues. In our series, the incidence of de novo segmental amplification or deletion in prenatal samples was 1.2%. Abnormal prenatal sonographic findings occurred in 40% of these de novo segmental amplification or deletion cases. Of these de novo segmental amplification or deletion pregnancies, 90% were voluntarily terminated.

Original languageEnglish
Pages (from-to)662-666
Number of pages5
JournalTaiwanese Journal of Obstetrics and Gynecology
Volume58
Issue number5
DOIs
StatePublished - 09 2019

Bibliographical note

Publisher Copyright:
© 2019

Keywords

  • Array CGH
  • Prenatal diagnosis
  • de novo

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