Novel intragenic deletions within the UBE3A gene in two unrelated patients with Angelman syndrome: Case report and review of the literature

Cinthia Aguilera, Marina Viñas-Jornet, Neus Baena, Elisabeth Gabau, Concepción Fernández, Nuria Capdevila, Sanja Cirkovic, Adrijan Sarajlija, Marijana Miskovic, Danijela Radivojevic, Anna Ruiz, Miriam Guitart

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    3 Citations (Scopus)

    Abstract

    © 2017 The Author(s). Background: Patients with Angelman syndrome (AS) are affected by severe intellectual disability with absence of speech, distinctive dysmorphic craniofacial features, ataxia and a characteristic behavioral phenotype. AS is caused by the lack of expression in neurons of the UBE3A gene, which is located in the 15q11.2-q13 imprinted region. Functional loss of UBE3A is due to 15q11.2-q13 deletion, mutations in the UBE3A gene, paternal uniparental disomy and genomic imprinting defects. Case presentation: We report here two patients with clinical features of AS referred to our hospital for clinical follow-up and genetic diagnosis. Methylation Specific-Multiplex Ligation-Dependent Probe Amplification (MS-MLPA) of the 15q11.2-q13 region was carried out in our laboratory as the first diagnostic tool detecting two novel UBE3A intragenic deletions. Subsequently, the MLPA P336-A2 kit was used to confirm and determine the size of the UBE3A deletion in the two patients. A review of the clinical features of previously reported patients with whole UBE3A gene or partial intragenic deletions is presented here together with these two new patients. Conclusion: Although rare, UBE3A intragenic deletions may represent a small fraction of AS patients without a genetic diagnosis. Testing for UBE3A intragenic exonic deletions should be performed in those AS patients with a normal methylation pattern and no mutations in the UBE3A gene.
    Original languageEnglish
    Article number137
    JournalBMC Medical Genetics
    Volume18
    Issue number1
    DOIs
    Publication statusPublished - 21 Nov 2017

    Keywords

    • Angelman syndrome (AS)
    • Intragenic deletions
    • MLPA
    • UBE3A

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