title: Prevalence of lysosomal storage diseases in Portugal.
abstract: Lysosomal storage diseases (LSDs) are a group of inherited metabolic disorders individually considered as rare, and few data on its prevalence has been reported in the literature. The overall birth prevalence of the 29 different LSDs studied in the Portuguese population was calculated to be 25/100000 live births, twice the prevalence previously described in Australia and in The Netherlands. The comparison of the prevalence profile of the LSDs presenting a prevalence higher than 0.5/100000 in the Portuguese, Dutch and Australian populations showed, in the Portuguese, the existence of a higher prevalence of GM2 gangliosidoses (B variant), mucolipidoses (II and III), Niemman-Pick type C and metachromatic leukodystrophy (MLD), and a lower prevalence of Pompe and Fabry. The highest prevalence value for a single LSD is the one of GM2 gangliosidoses (B variant), corresponding to 3/100000, a value which is significantly higher than the prevalence of the most frequent LSD in Dutch, Pompe disease (2/100000) and Australians, Gaucher's disease (GD) (1.8/100000). It is worth noting that the highest prevalence of GM2 gangliosidoses found in the Portuguese is mainly due to the existence of a unique subtype, the rare juvenile B1 variant.
authors.affiliation: Instituto de Genética Médica Jacinto de Magalhães, Porto, Portugal.
authors.forename: Rui
authors.initials: R
authors.lastname: Pinto
authors.forename: Carla
authors.initials: C
authors.lastname: Caseiro
authors.forename: Manuela
authors.initials: M
authors.lastname: Lemos
authors.forename: Lurdes
authors.initials: L
authors.lastname: Lopes
authors.forename: Augusta
authors.initials: A
authors.lastname: Fontes
authors.forename: Helena
authors.initials: H
authors.lastname: Ribeiro
authors.forename: Eugénia
authors.initials: E
authors.lastname: Pinto
authors.forename: Elisabete
authors.initials: E
authors.lastname: Silva
authors.forename: Sónia
authors.initials: S
authors.lastname: Rocha
authors.forename: Ana
authors.initials: A
authors.lastname: Marcão
authors.forename: Isaura
authors.initials: I
authors.lastname: Ribeiro
authors.forename: Lúcia
authors.initials: L
authors.lastname: Lacerda
authors.forename: Gil
authors.initials: G
authors.lastname: Ribeiro
authors.forename: Olga
authors.initials: O
authors.lastname: Amaral
authors.forename: M C
authors.initials: MC
authors.lastname: Sá Miranda
mesh_terms: D006801:Humans; D016464:Lysosomal Storage Diseases / Q000453:epidemiology*; D011174:Portugal / Q000453:epidemiology; D015995:Prevalence