Journal
JOURNAL OF HUMAN GENETICS
Volume 54, Issue 8, Pages 493-496Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/jhg.2009.66
Keywords
acid alpha-glucosidase; glycogen-storage disease type II; mutation; Pompe disease; splicing
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Funding
- Takeda Science Foundation
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Glycogen-storage disease type II (GSDII) is an autosomal recessive disorder caused by a deficiency of acid a-glucosidase (GAA). The residual GAA activity is largely related to the severity of the clinical course. Most patients with infantile-onset GSDII do not show any enzyme activity, whereas patients with the late-onset forms of GSDII show various degrees of GAA activity. We performed a molecular genetic study on a Japanese boy with childhood-onset GSDII. The patient was a compound heterozygote for a newly discovered splice-site c.546G>T mutation and a recurrent missense p.R600C mutation, which usually causes the fatal infantile form in a homozygous state. The c.546G>T mutation, which did not alter the amino-acid sequence, was positioned at the last base of exon 2. cDNA-sequencing analysis revealed that c.546G>T was a leaky splice mutation, leading to the production of a normally spliced transcript, which was responsible for the low-level (approximately 10%) expression of the active enzyme in the patient's fibroblasts. Journal of Human Genetics (2009) 54, 493-496; doi: 10.1038/jhg.2009.66; published online 17 July 2009
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