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Scientific article
English

Infantile-Onset Paroxysmal Movement Disorder and Episodic Ataxia Associated with a TBC1D24 Mutation

Published inNeuropediatrics, vol. 50, no. 5, p. 308-312
Publication date2019
Abstract

Mutations that disrupt the TBC1D24 presynaptic protein have been implicated in various neurological disorders including epilepsy, chronic encephalopathy, DOORS (deafness, onychodystrophy, osteodystrophy, mental retardation, and seizures) syndrome, nonsyndromic hearing loss, and myoclonus. We present the case of a 22-month-old male with infantile-onset paroxysmal episodes of facial and limb myoclonus. The episodes were linked to biallelic variants in exon 2 of the TBC1D24 gene that lead to amino acid changes (c.304C >T/p.Pro102Ser and c.410T > C/p.Val137Ala), each variant being inherited from a parent. Follow-up imaging in adolescence revealed widened right cerebellar sulci. We discuss the evolving landscape of TBC1D24 associated phenotypes; this case adds to a growing body of evidence linking this gene to movement disorders in children.

Keywords
  • Age of Onset
  • Ataxia/complications/diagnosis/genetics
  • Brain/diagnostic imaging/pathology
  • GTPase-Activating Proteins/genetics
  • Humans
  • Infant
  • Male
  • Movement Disorders/complications/diagnosis/genetics
  • Mutation
Citation (ISO format)
ZIMMERN, Vincent et al. Infantile-Onset Paroxysmal Movement Disorder and Episodic Ataxia Associated with a TBC1D24 Mutation. In: Neuropediatrics, 2019, vol. 50, n° 5, p. 308–312. doi: 10.1055/s-0039-1688410
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ISSN of the journal0174-304X
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