Undiagnosed rare disease clinic identifies a novel UBE3A variant in two sisters with Angelman syndrome: The end of a diagnostic odyssey.

Abstract excerpt

Angelman syndrome (AS, MIM #105830) is a neurodevelopmental disorder characterized by severe intellectual disability, profound developmental delay, movement or balance problems, an excessively cheerful disposition, and seizures. AS results from inadequate expression of the maternal UBE3A gene (MIM #601623), which encodes an E3 ligase in the ubiquitin-proteasome pathway. Here we present the case of two sisters...

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