Abstract
Purpose
To evaluate the performance of chromosomal microarray analysis (CMA) in fetuses with nuchal translucency (NT) > 95th percentile. Secondary objectives were to analyze these results according to NT thickness, below or above 3.5 mm, and those without associated anomalies.
Methods
This observational single-cohort study was conducted between 2015 and 2018 in fetuses with NT > 95th percentile. Following an invasive test, quantitative fluorescence-polymerase chain reaction (QF-PCR) was performed, and if normal, CMA was performed. Pathogenic copy number variants (CNVs), non-reported pathogenic CNV, pathogenic autosomal recessive variants and variants of unknown significance (VUS) were analysed.
Results
One-hundred and sixty-two fetuses with NT > 95th percentile, normal QF-PCR and CMA were included. Amongst 128 fetuses with NT between the 95th percentile and 3.5 mm, one (0.8%) had a pathogenic CNV, four (3.1%) had non-reported pathogenic CNV, one (0.8%) had pathogenic autosomal recessive variant and 13 (10.2%) had VUS. Amongst 34 fetuses with NT ≥ 3.5 mm, four (11.8%) had pathogenic CNV, one (2.9%) had non-reported pathogenic CNV, one (2.9%) had pathogenic autosomal recessive variant and four (11.8%) had VUS. Four in 162 (2.5%) fetuses had CNVs at the chromosome 16p13.11 region. Amongst 154 fetuses without structural abnormalities and normal QF-PCR, three (1.9%) had a pathogenic CNV, 5 (3.2%) had non-reported pathogenic CNV, one (0.6%) autosomal recessive pathogenic CNV and 16 (10.4%) had VUS.
Conclusion
Pathogenic CNVs were found in 1% of fetuses with an NT thickness between the 95th percentile and 3.5 mm and in 12% of fetuses with NT ≥ 3.5 mm. CNVs were found at the 16p13.11 region in 2.5% of cases.
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Abbreviations
- NT:
-
Nuchal translucency
- CGH:
-
Comparative genomic hybridization
- CNV:
-
Copy number variant
- QF-PCR:
-
Quantitative fluorescence-polymerase chain reaction
- CMA:
-
Chromosomal microarray analysis
- VUS:
-
Variant of unknown significance
- SD:
-
Standard deviation
- CI:
-
Confidence interval
- cfDNA:
-
Cell-free DNA
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ECC: Protocol development, Data collection or management, Data analysis, Manuscript writing/editing. MAS-D: Protocol development, Data collection or management, Data analysis, Manuscript writing/editing. IC: Data collection or management, Manuscript writing/editing. MTH: Data collection or management, Manuscript writing/editing. MA-G: Data collection or management, Manuscript writing/editing. CR: Data collection or management, Manuscript writing/editing. NM: Data collection or management, Data analysis, Manuscript writing/editing. APR: Data collection or management, Manuscript writing/editing. NCS: Data collection or management, Manuscript writing/editing. CMV: Data collection or management, Manuscript writing/editing. EC: Manuscript writing/editing.
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This study was performed in line with the principles of the Declaration of Helsinki. The study was approved by the institutional research ethics committee of Vall d'Hebron University Hospital (CEIC-VHIR), PR(AMI)408/2019 on November 22nd 2019.
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Coello-Cahuao, E., Sánchez-Durán, M.Á., Calero, I. et al. Array study in fetuses with nuchal translucency above the 95th percentile: a 4-year observational single-centre study. Arch Gynecol Obstet 307, 285–292 (2023). https://doi.org/10.1007/s00404-022-06564-7
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DOI: https://doi.org/10.1007/s00404-022-06564-7