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Diagnostic approach to a paediatric patient with Wiedemann-Steiner syndrome with de novo missense variant in the KMT2A gene - a case report.
Annals of Agricultural and Environmental Medicine : AAEM 2023 September 29
INTRODUCTION: Wiedemann-Steiner syndrome is caused by mutations in the KMT2A gene (11q23.3). It might be inherited autosomal dominant or appear de novo. Features described in the syndrome include developmental delay, short stature, hypotonia, hypertrichosis, facial dysmorphic features, and intellectual disability.
CASE REPORT: A boy aged 5.5 months was admitted to the Genetics Outpatient Clinic due to delayed psychomotor development. Microsomia, hypotonia, joint laxity, and facial dysmorphic features were noticed. No genomic imbalance was found in microarray, based on comparative genomic hybridization. The c.3528G>T variant of the KMT2A gene was identified on chromosome 11 of the missense type in next-generation sequencing. The reasons for phenotypic features were confirmed in genetic research.
CONCLUSIONS: Wiedemann-Steiner syndrome has a variable clinical phenotype. There is a strong need to pay attention to phenotypic features that may suggest the syndrome and refer patients for appropriate genetic diagnostics.
CASE REPORT: A boy aged 5.5 months was admitted to the Genetics Outpatient Clinic due to delayed psychomotor development. Microsomia, hypotonia, joint laxity, and facial dysmorphic features were noticed. No genomic imbalance was found in microarray, based on comparative genomic hybridization. The c.3528G>T variant of the KMT2A gene was identified on chromosome 11 of the missense type in next-generation sequencing. The reasons for phenotypic features were confirmed in genetic research.
CONCLUSIONS: Wiedemann-Steiner syndrome has a variable clinical phenotype. There is a strong need to pay attention to phenotypic features that may suggest the syndrome and refer patients for appropriate genetic diagnostics.
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