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Preserved expressive language as a phenotypic determinant of Mosaic Angelman Syndrome.

Authors :
Carson RP
Bird L
Childers AK
Wheeler F
Duis J
Source :
Molecular genetics & genomic medicine [Mol Genet Genomic Med] 2019 Sep; Vol. 7 (9), pp. e837. Date of Electronic Publication: 2019 Aug 10.
Publication Year :
2019

Abstract

Background: Angelman Syndrome (AS) is a neurodevelopmental disorder with core features of intellectual disability, speech impairment, movement disorders, and a unique behavioral profile. Typically, AS results from absent maternal expression of UBE3A, but some individuals have imprinting defects in a portion of their cells. These individuals are mosaic for normal and defective UBE3A expression, resulting in mosaic AS (mAS) with a partial loss of gene expression.<br />Methods: This study aims to contrast the mAS phenotype to that of AS. Clinical characteristics of mAS were obtained from a parental survey of 22 mAS patients and from the Angelman Natural History study. These were contrasted with those of AS using historical data.<br />Results: Developmental delay was present in nearly all mAS patients, whereas the core features of AS were reported in less than 40%. While language and ability to manage activities of daily living were markedly improved over that expected in AS, mAS patients demonstrated a high incidence of behavioral challenges.<br />Conclusion: Clinical work-up of an individual with developmental delay, hyperactivity, anxiety, and an uncharacteristically happy demeanor should prompt methylation studies to rule out mAS. We expand the phenotypic spectrum of AS to include features that overlap with Prader-Willi such as hyperphagia.<br /> (© 2019 The Authors. Molecular Genetics & Genomic Medicine published by Wiley Periodicals, Inc.)

Details

Language :
English
ISSN :
2324-9269
Volume :
7
Issue :
9
Database :
MEDLINE
Journal :
Molecular genetics & genomic medicine
Publication Type :
Academic Journal
Accession number :
31400086
Full Text :
https://doi.org/10.1002/mgg3.837