Premium
Two new mutations in the 3′ coding region of the glycogen debranching enzyme in a glycogen storage disease type IIIa Ashkenazi Jewish patient
Author(s) -
Parvari R.,
Shen J.,
Hershkovitz E.,
Chen Y. T.,
Moses S. W.
Publication year - 1998
Publication title -
journal of inherited metabolic disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 102
eISSN - 1573-2665
pISSN - 0141-8955
DOI - 10.1023/a:1005343625756
Subject(s) - glycogen debranching enzyme , glycogen storage disease , glycogen , enzyme , genetics , medicine , endocrinology , glycogen synthase , biology , biochemistry
Glycogen storage disease type III (GSD III) is an autosomal recessive disease caused by the deficiency of glycogen debranching enzyme (AGL). We report the finding of two new mutations in a GSD IIIa Ashkenazi Jewish patient. Both mutations are insertion of an adenine into a stretch of 8 adenines towards the 3′ end of the coding region: one at position 3904 (3904insA) in exon 30, the second at position 4214 (4214insA) in exon 32. The mutations cause frameshifts and premature terminations of the glycogen debranching enzyme, the first causing a frameshift at amino acid 1304, the second causing a frameshift at amino acid 1408 of the total of 1532. These mutations demonstrate the importance of the 125 amino acids at the carboxy‐terminus of the debrancher enzyme for its activity and support the suggestion that the putative glycogen binding domain is located in the carboxy‐terminus of the AGL. The mutations cause distinctive single‐strand conformation polymorphism (SSCP) patterns enabling easy detection.