alexa Silent exonic mutation in the acid-alpha-glycosidase gene that causes glycogen storage disease type II by affecting mRNA splicing.


Pediatrics & Therapeutics

Author(s): Maimaiti M, Takahashi S, Okajima K, Suzuki N, Ohinata J,

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Abstract Glycogen-storage disease type II (GSDII) is an autosomal recessive disorder caused by a deficiency of acid alpha-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. This article was published in J Hum Genet and referenced in Pediatrics & Therapeutics

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