Severe Neurodevelopmental Disorder in Autosomal Recessive Spinocerebellar Ataxia 13 (SCAR13) Caused by Two Novel Frameshift Variants in GRM1.
Ataxia
GRM1
Neurodevelopmental disorder
SCAR13
Journal
Cerebellum (London, England)
ISSN: 1473-4230
Titre abrégé: Cerebellum
Pays: United States
ID NLM: 101089443
Informations de publication
Date de publication:
13 Oct 2023
13 Oct 2023
Historique:
accepted:
05
10
2023
medline:
13
10
2023
pubmed:
13
10
2023
entrez:
13
10
2023
Statut:
aheadofprint
Résumé
Autosomal recessive spinocerebellar ataxia 13 (SCAR13) is a neurological disease characterized by psychomotor delay, mild to profound intellectual disability with poor or absent language, nystagmus, stance ataxia, and, if walking is acquired, gait ataxia. Epilepsy and polyneuropathy have also been documented in some patients. Cerebellar atrophy and/or ventriculomegaly may be present on brain MRI. SCAR13 is caused by pathogenic variants in the GRM1 gene encoding the metabotropic receptor of glutamate type 1 (mGlur1), which is highly expressed in Purkinje cerebellar cells, where it plays a fundamental role in cerebellar development. Here we discuss the case of an 8-year-old patient who presented with a severe neurodevelopmental disorder with balance disturbance, absence of independent walking, absence of language, diffuse hypotonia, mild nystagmus, and mild dysphagia. Whole-exome sequencing revealed a compound heterozygosity for two likely pathogenic variants in the GRM1 gene, responsible for the patient's phenotype, and made it possible to diagnose autosomal recessive spinocerebellar ataxia SCAR13. The detected (novel) variants appear to be causative of a particularly severe picture with regard to neurodevelopment, in the context of the typical neurological signs of spinocerebellar ataxia.
Identifiants
pubmed: 37831383
doi: 10.1007/s12311-023-01617-2
pii: 10.1007/s12311-023-01617-2
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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