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1 results

  • 9 - Prader-Willi and Angelman syndromes: from childhood to adult life

  • Edited by Patricia Howlin, St George's Hospital Medical School, University of London, Orlee Udwin, Mary Sheridan Centre for Child Health, London
  • Book:
    Outcomes in Neurodevelopmental and Genetic Disorders
    Published online:
    13 August 2009
    Print publication:
    25 July 2002, pp 220-240

  • Summary

    The Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are two distinct syndromes that have in common either deletion at the locus 15q11.2 or the presence of genetic abnormalities of chromosome 15. PWS is likely to be a contiguous gene syndrome in which the failure of expression of specific maternally imprinted genes is of aetiological significance. In contrast, AS has been shown to be due to the loss of expression of a single paternally imprinted gene. This may occur because of a mutation affecting UB3EA, the deletion of the maternal copy of that gene, or the presence of a paternal chromosome 15 disomy. This genetic map is illustrated in this chapter. PWS and AS have illustrated the importance of a specific genetic mechanism on human development and how the expression or not of specific imprinted gene(s) has radically different effects on development and behaviour.