title: Practice guidelines for the molecular analysis of Prader-Willi and Angelman syndromes.
abstract: BACKGROUND
  Prader-Willi syndrome (PWS) and Angelman syndrome (AS) are clinically distinct neurodevelopmental genetic disorders that map to 15q11-q13. The primary phenotypes are attributable to loss of expression of imprinted genes within this region which can arise by means of a number of mechanisms. The most sensitive single approach to diagnosing both PWS and AS is to study methylation patterns within 15q11-q13; however many techniques exist for this purpose. Given the diversity of techniques available, there is a need for consensus testing and reporting guidelines.
  
  
  METHODS
  Testing and reporting guidelines have been drawn up and agreed in accordance with the procedures of the UK Clinical Molecular Genetics Society and the European Molecular Genetics Quality Network.
  
  
  RESULTS
  A practical set of molecular genetic testing and reporting guidelines has been developed for these two disorders. In addition, advice is given on appropriate reporting policies, including advice on test sensitivity and recurrence risks. In considering test sensitivity, the possibility of differential diagnoses is discussed.
  
  
  CONCLUSIONS
  An agreed set of practice guidelines has been developed for the diagnostic molecular genetic testing of PWS and AS.
authors.affiliation: National Genetics Reference Laboratory (Manchester), Saint Mary's Hospital, Hathersage Road, Manchester M13OJH, UK. simon.ramsden@cmft.nhs.uk
authors.forename: Simon C
authors.initials: SC
authors.lastname: Ramsden
authors.forename: Jill
authors.initials: J
authors.lastname: Clayton-Smith
authors.forename: Rachael
authors.initials: R
authors.lastname: Birch
authors.forename: Karin
authors.initials: K
authors.lastname: Buiting
mesh_terms: D017204:Angelman Syndrome / Q000175:diagnosis* / Q000235:genetics; D015139:Blotting, Southern; D002884:Chromosomes, Human, Pair 15; D019175:DNA Methylation; D006801:Humans; D018895:Microsatellite Repeats; D025202:Molecular Diagnostic Techniques; D016133:Polymerase Chain Reaction; D017410:Practice Guidelines as Topic; D011218:Prader-Willi Syndrome / Q000175:diagnosis* / Q000235:genetics; D055517:snRNP Core Proteins / Q000235:genetics
chemical_list: D055517:snRNP Core Proteins
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