Dystonia-ataxia syndrome with permanent torsional nystagmus caused by ECHS1 deficiency.

Annals of clinical and translational neurology 2020 May

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Biallelic mutations in ECHS1, encoding the mitochondrial enoyl-CoA hydratase, have been associated with mitochondrial encephalopathies with basal ganglia involvement. Here, we describe a novel clinical presentation consisting of dystonia-ataxia syndrome with hearing loss and a peculiar torsional nystagmus observed in two adult siblings. The presence of a 0.9-ppm peak at MR spectroscopy analysis suggested the accumulation of branched-chain amino acids. Exome sequencing in index probands identified two ECHS1 mutations, one of which was novel (p.V82L). ECHS1 protein levels and residual activities were reduced in patients' fibroblasts. This paper expands the phenotypic spectrum observed in patients with impaired valine catabolism. © 2020 The Authors. Annals of Clinical and Translational Neurology published by Wiley Periodicals LLC on behalf of American Neurological Association.

Citation

Dario Ronchi, Edoardo Monfrini, Sara Bonato, Veronica Mancinelli, Claudia Cinnante, Sabrina Salani, Andreina Bordoni, Patrizia Ciscato, Francesco Fortunato, Marianna Villa, Alessio Di Fonzo, Stefania Corti, Nereo Bresolin, Giacomo P Comi. Dystonia-ataxia syndrome with permanent torsional nystagmus caused by ECHS1 deficiency. Annals of clinical and translational neurology. 2020 May;7(5):839-845