1. Genotype-phenotype correlation in adult-onset acid maltase deficiency
- Author
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Marian A. Kroos, Frans G. I. Jennekens, Margreet G. E. M. Ausems, Marie-José H. van den Boogaard, Hans Kristian Ploos van Amstel, Otto P. van Diggelen, Elly F. Ippel, John H. J. Wokke, Marijke Boer, and Arnold J. J. Reuser
- Subjects
Adult ,Male ,Proband ,medicine.medical_specialty ,Adolescent ,Genotype ,Molecular Sequence Data ,Biology ,Compound heterozygosity ,Exon ,Internal medicine ,medicine ,Humans ,Age of Onset ,Allele ,Transversion ,Alleles ,Genetics ,Base Sequence ,Glycogen Storage Disease Type II ,Muscle weakness ,alpha-Glucosidases ,DNA ,Middle Aged ,Phenotype ,Endocrinology ,Neurology ,Mutation ,Female ,Neurology (clinical) ,Glucan 1,4-alpha-Glucosidase ,Age of onset ,medicine.symptom - Abstract
We performed a clinical, biochemical, and genetic study in 16 patients from 11 families with adult-onset acid maltase deficiency. All patients were compound heterozygotes and carried the IVS1(-13T --G) transversion on one allele; the second allele harbored either a deletion of a T at position 525 in exon 2 (7 probands, 64%) or a deletion of exon 18 (1 proband, 9%). Deterioration of handicap was related to age, and decrease in vital capacity to duration of the symptomatic stage. Respiratory insufficiency was never the first manifestation. The levels of activity of serum creatine kinase and of alpha-glucosidase in peripheral blood cells or muscle were helpful for the diagnosis, but did not have prognostic value. The adult form of acid maltase deficiency appears to be both clinically and genetically rather homogeneous; decrease of alpha-glucosidase activity is the final common pathway leading to destruction of muscle fibers and progression of muscle weakness over a period of years.
- Published
- 1995
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