Parental somatic mosaicism for CNV deletions - A need for more sensitive and precise detection methods in clinical diagnostics settings.
Genomics
; 112(5): 2937-2941, 2020 09.
Article
em En
| MEDLINE
| ID: mdl-32387503
ABSTRACT
To further assess the scale and level of parental somatic mosaicism, we queried the CMA database at Baylor Genetics. We selected 50 unrelated families where clinically relevant apparent de novo CNV-deletions were found in the affected probands. Parental blood samples screening using deletion junction-specific PCR revealed four parents with somatic mosaicism. Droplet digital PCR (ddPCR), qPCR, and amplicon-based next-generation sequencing (NGS) were applied to validate these findings. Using ddPCR levels of mosaicism ranged from undetectable to 18.5%. Amplicon-based NGS and qPCR for the father with undetectable mosaicism was able to detect mosaicism at 0.39%. In one mother, ddPCR analysis revealed 15.6%, 10.6%, 8.2%, and undetectable levels of mosaicism in her blood, buccal cells, saliva, and urine samples, respectively. Our data suggest that more sensitive and precise methods, e.g. CNV junction-specific LR-PCR, ddPCR, or qPCR may allow for a more refined assessment of the potential disease recurrence risk for an identified variant.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Reação em Cadeia da Polimerase
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Variações do Número de Cópias de DNA
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Mosaicismo
Tipo de estudo:
Diagnostic_studies
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Prognostic_studies
Limite:
Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article