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28.08.2018 | Glycogen Storage Disease

Late-onset Pompe disease in France: molecular features and epidemiology from a nationwide study

Zeitschrift:
Journal of Inherited Metabolic Disease
Autoren:
Claudio Semplicini, Pascaline Letard, Marie De Antonio, Nadjib Taouagh, Barbara Perniconi, Françoise Bouhour, Andoni Echaniz-Laguna, David Orlikowski, Sabrina Sacconi, Emmanuelle Salort-Campana, Guilhem Solé, Fabien Zagnoli, Dalil Hamroun, Roseline Froissart, Catherine Caillaud, Pascal Laforêt, French Pompe Study Group
Wichtige Hinweise
Communicating Editor: Manuel Schiff

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s10545-018-0243-7) contains supplementary material, which is available to authorized users.
Claudio Semplicini and Pascaline Letard contributed equally to this work.

Abstract

Pompe disease (PD) is caused by a deficiency of lysosomal acid α-glucosidase resulting from mutations in the GAA gene. The clinical spectrum ranges from a rapidly fatal multisystemic disorder (classic PD, onset < 1 year) to a milder adult onset myopathy. The aims of this study were to characterize the GAA mutations, to establish the disease epidemiology, and to identify potential genotype-phenotype correlations in French late-onset PD patients (onset ≥ 2 years) diagnosed since the 1970s. Data were collected from the two main laboratories involved in PD diagnosis and from the French Pompe registry. Two hundred forty-six patients (130 females and 116 males) were included, with a mean age at diagnosis of 43 years. Eighty-three different mutations were identified in the GAA gene, among which 28 were novel. These variants were spread all over the sequence and included 42 missense (one affecting start codon), 8 nonsense, 15 frameshift, 14 splice mutations, 3 small in-frame deletions, and one large deletion. The common c.-32-13T>G mutation was detected in 151/170 index cases. Other frequent mutations included the exon 18 deletion, the c.525del, and the missense mutations c.1927G>A (p.Gly643Arg) and c.655G>A (p.Gly219Arg). Patients carrying the c.-32-13T>G mutation had an older mean age at onset than patients non-exhibiting this mutation (36 versus 25 years). Patients with the same genotype had a highly variable age at onset. We estimated the frequency of late-onset PD in France around 1/69,927 newborns. In conclusion, we characterized the French cohort of late-onset PD patients through a nationwide study covering more than 40 years.

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Zusatzmaterial
High resolution image (TIF 33972 kb)
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High resolution image (TIF 692 kb)
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Table S1 (DOC 35 kb)
10545_2018_243_MOESM3_ESM.doc
Table S2 (DOC 21 kb)
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Table S3 (DOC 24 kb)
10545_2018_243_MOESM5_ESM.doc
Literatur
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