Abstract
Purpose
The present study aims to evaluate the utility of high-resolution single-nucleotide polymorphism (SNP) arrays in fetuses with ventricular septal defects (VSDs) with or without other structural anomalies but with normal karyotypes and to investigate the outcomes of cases of prenatal VSDs via clinical follow-up.
Methods
We analyzed 144 fetuses with VSDs and normal karyotypes using Affymetrix CytoScan HD arrays and the analyses were carried out a year after birth.
Results
Clinically significant CNVs were detected in 12 fetuses (8.3%). The most common pathogenic CNV was a 22q11.2 deletion with a detection rate of 2.8% (4/144). Well-known microdeletion or microduplication syndromes, including Smith–Magenis, Miller–Dieker, 9q subtelomeric deletion, 1p36 microdeletion, 1q21.1 microduplication, and terminal 4q deletion syndrome, were identified in six cases. Three regions of chromosomal imbalance were also identified: microduplication at 12q24.32q24.33, microdeletion at 16p13.13p13.12 and microdeletion at Xp21.1. The genes TBX1, SKI, GJA5, EHMT1, NOTCH1 were identified as established genes and LZTR1, PRDM26, YWHAE, FAT1, AKAP10, ERCC4, and ULK1 were identified as potential candidate genes of fetal VSDs. There was no significant difference in pathogenic CNVs between isolated VSDs and VSDs with additional structural abnormalities. Ninety-five (74.8%) pregnant women with fetuses with benign CNVs chose to continue the pregnancy and had a favorable prognosis, while nine (75%) pregnant women with fetuses with pathogenic CNVs chose to terminate the pregnancy.
Conclusions
High-resolution SNP arrays are valuable tools for identifying submicroscopic chromosomal abnormalities in the prenatal diagnosis of VSDs. An excellent outcome can be expected for VSD fetuses that are negative for chromosomal anomalies and other severe anatomic abnormalities.
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We thank the patients for participating in this study.
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FF: project development, data collection, manuscript writing. QD: project development, data collection, manuscript writing. TL: data collection, manuscript writing. RL: methodology, data collection. XJ: methodology, data collection. XY: data collection. CL: conceptualization, project administration, funding acquisition
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This study was supported by funding from the National Natural Science Foundation of China (81671474); the National Natural Science Foundation of China (81501267); the general program of the Science and Technology Innovation Committee in Guangzhou (201604020012); the key program of the Science and Technology Department in Guangdong province (2014B020213001); the key program of the Science and Technology Bureau in Guangzhou (201400000004-4); and the key program of the Science and Technology Department in Guangdong Province (2013B022000005).
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The authors declare that they have no conflict or interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Fu, F., Deng, Q., Lei, Ty. et al. Clinical application of SNP array analysis in fetuses with ventricular septal defects and normal karyotypes. Arch Gynecol Obstet 296, 929–940 (2017). https://doi.org/10.1007/s00404-017-4518-2
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DOI: https://doi.org/10.1007/s00404-017-4518-2