Sandhoff disease without hepatosplenomegaly due to hexosaminidase B gene mutation
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چکیده
منابع مشابه
Sandhoff Disease without Hepatosplenomegaly Due to Hexosaminidase B Gene Mutation
Sandhoff disease is a neurodegenerative disease caused due to deficiency of hexosaminidase (HEX) A and B. A 1-year-old male child presented with regression of milestones, exaggerated startle response, decreased vision, and seizures from 6 months of age. The child had coarse facies without hepatosplenomegaly. Serum levels of β hexosaminidase total (A + B) were low. Genetic testing for Sandhoff d...
متن کاملThe X-ray crystal structure of human beta-hexosaminidase B provides new insights into Sandhoff disease.
Human lysosomal beta-hexosaminidases are dimeric enzymes composed of alpha and beta-chains, encoded by the genes HEXA and HEXB. They occur in three isoforms, the homodimeric hexosaminidases B (betabeta) and S (alphaalpha), and the heterodimeric hexosaminidase A (alphabeta), where dimerization is required for catalytic activity. Allelic variations in the HEXA and HEXB genes cause the fatal inbor...
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Three siblings in their sixth and seventh decade with hexosaminidase A and B deficiency (adult form of GM2-gangliosidosis, variant O) developed early and severe sensory loss in addition to chronic motor neuron disease and cerebellar ataxia. Prominent mechanoallodynia was a manifesting symptom in two siblings. It is suggested that sensory deficits are due to a central-peripheral dying back axono...
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ژورنال
عنوان ژورنال: Journal of Pediatric Neurosciences
سال: 2017
ISSN: 1817-1745
DOI: 10.4103/1817-1745.205623