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It is considered heterogeneous with respect to prevalence, clinical presentation, biochemistry (four biochemical forms of the disease referred to as MPSIIIA, B, C, and D are known), and causative mutations. The perspective of therapeutic options emphasizes the need for better knowledge of MPSIII incidence and natural history. We performed parallel retrospective epidemiological studies of patients diagnosed with MSPIII in France (n\u2009=\u2009128), UK (n\u2009=\u2009126), and Greece (n\u2009=\u200920) from 1990 to 2006. Incidences ranged from 0.68 per 100,000 live\u2010births in France to 1.21 per 100,000 live\u2010births in UK. MPSIIIA, which predominates in France and UK, was absent in Greece, where most patients have MPSIIIB. The study confirmed the large allelic heterogeneity of MPSIIIA and MPSIIIB and detected several yet undescribed mutations. Analysis of clinical manifestations at diagnosis and over a 6\u20137 years follow\u2010up indicated that almost all patients, whatever the disease subtype, expressed neurological manifestations before the age of 5 years, including language acquisition delay, cognitive delay, and\/or abnormal behavior. In contrast to relatively homogeneous early onset manifestations, disease progression showed significant variation depending on subtype and age at diagnosis. Different severities of disease progressions and different allele distribution between France and UK suggested that mutations are not equally deleterious, although genotype\u2013phenotype correlation could not be established. Notwithstanding the rapidity of further clinical deterioration, all MPSIII patients suffer early onset devastating neurological manifestations that deserve early treatment when available. \u00a9 2010 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.a.33779","type":"journal-article","created":{"date-parts":[[2010,12,28]],"date-time":"2010-12-28T21:31:48Z","timestamp":1293571908000},"page":"58-68","source":"Crossref","is-referenced-by-count":150,"title":["Incidence and natural history of mucopolysaccharidosis type III in France and comparison with United Kingdom and 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