Dystonia-deafness syndrome caused by a β-actin gene mutation and response to deep brain stimulation.

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Dystonia-deafness syndrome caused by a β-actin gene mutation and response to deep brain stimulation.

Mov Disord. 2017 Jan;32(1):162-165

Authors: Eggink H, van Egmond ME, Verschuuren-Bemelmans CC, Schönherr MC, de Koning TJ, Oterdoom DL, van Dijk JM, Tijssen MA

Abstract
INTRODUCTION: Dystonia-deafness syndrome is a distinct clinical presentation within the dystonia-spectrum. Although several genetic and acquired causes have been reported, etiology remains unknown in the majority of patients.
OBJECTIVES: To describe two patients with dystonia-deafness syndrome due to a beta-actin gene mutation.
METHODS: We report on disease course, genetic testing, and management of 2 patients, mother and daughter, presenting with dystonia-deafness syndrome.
RESULTS: After exclusion of known dystonia-deafness syndrome causes, whole-exome sequencing revealed a beta-actin gene mutation (p.Arg183Trp) in both patients. Although beta-actin gene mutations are generally associated with developmental Baraitser-Winter syndrome, dystonia-deafness syndrome has been reported once in identical twin brothers. Bilateral GPi-DBS led to a significant decrease of dystonia and regain of independency in our patients.
CONCLUSION: The p.Arg183Trp mutation in the beta-actin gene is associated with the clinical presentation of dystonia-deafness syndrome, even with only minimal or no developmental abnormalities of Baraitser-Winter syndrome. GPi-DBS should be considered to ameliorate the invalidating dystonia in these patients. © 2016 International Parkinson and Movement Disorder Society.

PMID: 27862284 [PubMed - indexed for MEDLINE]

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