Molecular and clinical analyses of two patients with UPD(16)mat detected by screening 94 patients with Silver-Russell syndrome phenotype of unknown aetiology.
J Med Genet
; 56(6): 413-418, 2019 06.
Article
em En
| MEDLINE
| ID: mdl-30242100
ABSTRACT
BACKGROUND:
Recently, a patient with maternal uniparental disomy of chromosome 16 (UPD(16)mat) presenting with Silver-Russell syndrome (SRS) phenotype was reported. SRS is characterised by growth failure and dysmorphic features.OBJECTIVE:
To clarify the prevalence of UPD(16)mat in aetiology-unknown patients with SRS phenotype and phenotypic differences between UPD(16)mat and SRS.METHODS:
We studied 94 patients with SRS phenotype of unknown aetiology. Sixty-three satisfied the Netchine-Harbison clinical scoring system (NH-CSS) criteria, and 25 out of 63 patients showed both protruding forehead and relative macrocephaly (clinical SRS). The remaining 31 patients met only three NH-CSS criteria, but were clinically suspected as having SRS. To detect UPD(16)mat, we performed methylation analysis for the ZNF597TSS-differentially methylated region (DMR) on chromosome 16 and subsequently performed microsatellite, SNP array and exome analyses in the patients with hypomethylated ZNF597TSS-DMR.RESULTS:
We identified two patients (2.1%) with a mixture of maternal isodisomy and heterodisomy of chromosome 16 in 94 aetiology-unknown patients with SRS phenotype. Both patients exhibited preterm birth and prenatal and postnatal growth failure. The male patient had ventricular septal defect and hypospadias. Whole-exome sequencing detected no gene mutations related to their phenotypes.CONCLUSION:
We suggest considering genetic testing for UPD(16)mat in SRS phenotypic patients without known aetiology.Palavras-chave
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Assunto principal:
Fenótipo
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Cromossomos Humanos Par 16
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Metilação de DNA
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Dissomia Uniparental
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Síndrome de Silver-Russell
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article