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Homozygous GRID2 missense mutation predicts a shift in the D-serine binding domain of GluD2 in a case with generalized brain atrophy and unusual clinical features
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- Ali, Zafar (author)
- Uppsala universitet,Medicinsk genetik och genomik,Science for Life Laboratory, SciLifeLab,Human Molecular Genetics Laboratory, National Institute for Biotechnology and Genetic Engineering (NIBGE), PIEAS, Faisalabad, Pakistan
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- Zulfiqar, Shumaila (author)
- Uppsala universitet,Medicinsk genetik och genomik,Science for Life Laboratory, SciLifeLab
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- Klar, Joakim, 1974- (author)
- Uppsala universitet,Science for Life Laboratory, SciLifeLab,Medicinsk genetik och genomik
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- (creator_code:org_t)
- 2017-12-06
- 2017
- English.
- In: BMC Medical Genetics. - : Springer Science and Business Media LLC. - 1471-2350. ; 18:1
- Journal article (peer-reviewed)
Abstract
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- BACKGROUND: Spinocerebellar ataxias comprise a large and heterogeneous group of disorders that may present with isolated ataxia, or ataxia in combination with other neurologic or non-neurologic symptoms. Monoallelic or biallelic GRID2 mutations were recently reported in rare cases with cerebellar syndrome and variable degree of ataxia, ocular symptoms, hypotonia and developmental delay.CASE PRESENTATION: We report on a consanguineous family with autosomal recessive childhood onset of slowly progressive cerebellar ataxia and delayed psychomotor development in three siblings. MRI of an adult and affected family member revealed slightly widened cerebral and cerebellar sulci, suggesting generalized brain atrophy, and mild cerebellar atrophy. Using whole exome sequencing we identified a novel homozygous missense variant [c.2128C > T, p.(Arg710Trp)] in GRID2 that segregates with the disease. The missense variant is located in a conserved region encoding the extracellular serine-binding domain of the GluD2 protein and predicts a change in conformation of the protein.CONCLUSION: The widespread supratentorial brain abnormalities, absence of oculomotor symptoms, increased peripheral muscle tone and the novel missense mutation add to the clinical and genetic variability in GRID2 associated cerebellar syndrome. The neuroradiological findings in our family indicate a generalized neurodegenerative process to be taken into account in other families segregating complex clinical features and GRID2 mutations.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Medicinsk genetik (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Medical Genetics (hsv//eng)
Keyword
- 3D protein modeling
- Cerebellar syndrome
- Cerebral atrophy
- Developmental delay
- GRID2 gene
- GluD2
- Mutation
- Whole exome sequencing
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- ref (subject category)
- art (subject category)
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- Abdullah, Uzma
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