Imprinting center analysis in Prader-Willi and Angelman syndrome patients with typical and atypical phenotypes

Cristina Camprubí, Maria Dolors Coll, Sergi Villatoro, Elisabeth Gabau, Amine Kamli, Maria Jesus Martínez, David Poyatos, Miriam Guitart

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    Abstract

    Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are genetic disorders caused by a deficiency of imprinted gene expression from the paternal or maternal chromosome 15, respectively. This deficiency is due to the deletion of the 15q11-q13 region, parental uniparental disomy of the chromosome 15, or imprinting defect (ID). Mutation of the UBE3A gene causes approximately 10% of AS cases. In this present study, we describe the molecular analysis and phenotypes of two PWS patients and four AS patients with ID. One of the PWS patients has a non-familial imprinting center (IC) deletion and displayed a severe phenotype with an atypical PWS appearance, hyperactivity and psychiatric vulnerability. The other PWS and AS patients did not present genetic abnormalities in the IC, suggesting an epimutation as the genetic cause. The methylation pattern of two AS patients showed a faint maternal band corresponding to a mosaic ID. One of these mosaic patients displayed a mild AS phenotype while the other displayed a PWS-like phenotype. © 2006 Elsevier Masson SAS. All rights reserved.
    Original languageEnglish
    Pages (from-to)11-20
    JournalEuropean Journal of Medical Genetics
    Volume50
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2007

    Keywords

    • Imprinting defect
    • Methylation pattern
    • Mosaicism
    • Real-time PCR
    • Southern blot

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    Camprubí, C., Coll, M. D., Villatoro, S., Gabau, E., Kamli, A., Martínez, M. J., Poyatos, D., & Guitart, M. (2007). Imprinting center analysis in Prader-Willi and Angelman syndrome patients with typical and atypical phenotypes. European Journal of Medical Genetics, 50(1), 11-20. https://doi.org/10.1016/j.ejmg.2006.10.001