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The University of Southampton
Wessex Imprinting GroupInformation for clinicians

Prader Willi Syndrome

The main features of Prader-Willi syndrome are:

Genetic causes

80% of people with PWS have a deletion of chromosome 15 (a spontaneous deletion on the chromosome from the father). The other main cause is maternal UPD of chromosome 15. Rarer causes include imprinting problems on chromosome 15.


We would strongly recommend taking blood or DNA from both parents as well as the child, as this will allow us to rapidly establish the inheritance pattern which is particularly important in imprinting disorders. Furthermore it will provide evidence of whether a genetic finding has risen de novo.

When you send us a sample for genetic testing please send us all details on our Testing Criteria form.

These include:


When taking samples you should get written consent for the testing - as with any genetic test.

Send the sample to:-
Dr Deborah Mackay
Lecturer in Human Genetics
Wessex Imprinting Group
Division of Human Genetics
Wessex Genetics Laboratory
Salisbury Health Care Trust
SP2 8BJ ( email Deborah to tell her the sample is on route)
tel 01722 425048

And clinical details can be discussed with
Dr Karen Temple
Prof of Medical Genetics
and Honorary Consultant in Clinical Genetics
Academic Unit of Genetic Medicine
Princess Anne Hospital
Coxford Road
SO16 5YA
tel 02380 796625

For more information on genetic testing please look at the genetic testing section on this website.

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