Mosaic tetrasomy 9p detected by CNV-seq but missed by traditional karyotyping in a prenatal case without dysmorphic features
Abstract Introduction A unique case of mosaic tetrasomy 9p was found using CNV-seq analysis of uncultured amniocytes, which was missed by karyotype analysis of cultured amniocytes. Case report The karyotype was determined to be 46, XY, with mosaic duplication of chromosome 9 from p24.3 to p13.1 indi...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2025-07-01
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| Series: | Molecular Cytogenetics |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13039-025-00720-9 |
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| Summary: | Abstract Introduction A unique case of mosaic tetrasomy 9p was found using CNV-seq analysis of uncultured amniocytes, which was missed by karyotype analysis of cultured amniocytes. Case report The karyotype was determined to be 46, XY, with mosaic duplication of chromosome 9 from p24.3 to p13.1 indicated by CNV sequencing in the initial amniocentesis. Subsequent prenatal testing revealed a normal karyotype, with FISH analysis of cultured amniocytes identifying 2% tetrasomy of chromosome 9p. The karyotype of cord blood revealed mosaic tetrasomy 9p, while CNV-seq on uncultured cord blood indicated nearly complete tetrasomy 9p. Conclusions It is recommended to conduct CNV-seq or CMA on uncultured amniocytes in conjunction with karyotype analysis on cultured amniocytes. The presence of mosaic tetrasomy 9p during amniocentesis may result in either a benign condition or an adverse outcome, necessitating informed decision-making for pregnant women facing such circumstances. |
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| ISSN: | 1755-8166 |