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The University of Southampton
Wessex Imprinting GroupInformation for patients

Angelman Syndrome

The main characteristics of Angelman Syndrome are:

Genetic Causes

75% have a deletion of chromosome 15 (a spontaneous deletion on the chromosome from the mother). 7% have paternal UPD 15. A small proportion have mutations in the gene UBE3A and a small number are due to abnormal imprinting problems on chromosome 15.


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