Public Health Genomics
Original Paper
Glycogen Storage Disease Type II: Birth Prevalence Agrees with Predicted Genotype FrequencyAusems M.G.E.M.a · ten Berg K.a · Kroos M.A.b · van Diggelen O.P.b · Wevers R.A.c · Poorthuis B.J.H.M.d · Niezen-Koning K.E.e · van der Ploeg A.T.f · Beemer F.A.a · Reuser A.J.J.b · Sandkuijl L.A.a,b · Wokke J.H.J.gaDepartment of Medical Genetics, University Medical Center Utrecht, Utrecht, bDepartment of Clinical Genetics, Erasmus University, Academic Hospital Rotterdam, Rotterdam, cDepartment of Neurology, Academic Hospital Nijmegen, Nijmegen, dDepartments of Pediatrics and Clinical Genetics, Leiden University Medical Center, Leiden, eDepartment of Pediatrics, Research Laboratory, Academic Hospital Groningen, Groningen, fDepartment of Pediatrics, Sophia Children’s Hospital Rotterdam, Rotterdam, gDepartment of Neurology, University Medical Center Utrecht, Utrecht, The Netherlands
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Article / Publication Details
Published online: March 17, 2000
Issue release date: March 2000
Number of Print Pages: 6
Number of Figures: 1
Number of Tables: 3
ISSN: 1662-4246 (Print)
eISSN: 1662-8063 (Online)
For additional information: https://www.karger.com/PHG
Abstract
Objectives: To compare the overall birth prevalence of diagnosed glycogen storage disease type II (GSD II) with the predicted frequency based on mutation screening, in order to determine whether GSD II is an underdiagnosed condition, and to analyze which medical disciplines recognize GSD II. Methods: Retrospective data on all enzymatic diagnoses of GSD II were collected from diagnostic labs throughout the Netherlands, covering the period from January 1, 1972 to December 31, 1996. Age-specific diagnostic incidence rates were calculated for the entire study period. By adding together the diagnostic incidences for all age groups, we calculated the birth prevalence of diagnosed GSD II and compared these figures with the predicted frequency based on mutation screening in a random sample from the general population. The medical specialization of the referring clinicians was also recorded. Results: GSD II was diagnosed in 154 individuals, including 11 prenatal diagnoses. The birth prevalences of the various phenotypes were 1/101,000 (infantile form), 1/720,000 (juvenile form) and 1/53,000 (adult form). The birth prevalence of the adult and infantile phenotype together was 1/35,000. Eighty-two percent of the patients were diagnosed in university hospitals. Of the patients with infantile GSD II, 71% were diagnosed by a pediatrician, whereas most patients with adult GSD II were diagnosed by a neurologist (80%). Conclusions: There is no evidence for the underdiagnosis of GSD II in the Netherlands, as the calculated birth prevalences of the disease are consistent with previous predictions based on mutation screening in a random sample of newborns. The worldwide birth prevalence of the disease may well be higher than 1 in 100,000. GSD II is mainly diagnosed in university hospitals.
© 2000 S. Karger AG, Basel
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Article / Publication Details
Published online: March 17, 2000
Issue release date: March 2000
Number of Print Pages: 6
Number of Figures: 1
Number of Tables: 3
ISSN: 1662-4246 (Print)
eISSN: 1662-8063 (Online)
For additional information: https://www.karger.com/PHG
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