Abstract:
BACKGROUND:Pompe disease (acid maltase deficiency, glycogen storage disease type II; OMIM 232300) is an autosomal recessive lysosomal storage disorder characterized by acid alpha-glucosidase deficiency due to mutations in the GAA gene. Progressive skeletal muscle weakness affects motor and respiratory functions and is typical for all forms of Pompe disease. Cardiac hypertrophy is an additional fatal symptom in the classic infantile subtype. c.-32-13T-->G is the most common mutation in adults. OBJECTIVE:To delineate the disease variation among patients with this mutation and to define the c.-32-13T-->G haplotypes in search for genotype-phenotype correlations. METHODS:We studied 98 compound heterozygotes with a fully deleterious mutation (11 novel mutations are described) and the common c.-32-13T-->G mutation. RESULTS:All patients were Caucasian. None had the classic infantile form of Pompe disease. The clinical course varied far more than anticipated (age at diagnosis <1 to 78 years; age at onset: <1 to 52 years). The acid alpha-glucosidase activities in a subset of patients ranged from 4 to 19.9 nmol/mg/h. Twelve different c.-32-13T-->G haplotypes were identified based on 17 single-nucleotide polymorphisms located in the GAA gene. In 76% of the cases, c.-32-13T-->G was encountered in the second most common GAA core haplotype (DHRGEVVT). In only one case was c.-32-13T-->G encountered in the major GAA core haplotype (DRHGEIVT). CONCLUSION:Patients with the same c.-32-13T-->G haplotype (c.q. GAA genotype) may manifest first symptoms at different ages, indicating that secondary factors may substantially influence the clinical course of patients with this mutation.
journal_name
Neurologyjournal_title
Neurologyauthors
Kroos MA,Pomponio RJ,Hagemans ML,Keulemans JL,Phipps M,DeRiso M,Palmer RE,Ausems MG,Van der Beek NA,Van Diggelen OP,Halley DJ,Van der Ploeg AT,Reuser AJdoi
10.1212/01.wnl.0000252798.25690.76subject
Has Abstractpub_date
2007-01-09 00:00:00pages
110-5issue
2eissn
0028-3878issn
1526-632Xpii
68/2/110journal_volume
68pub_type
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