Dystonia-deafness syndrome caused by a β-actin gene mutation and response to deep brain stimulation.
Mov Disord 2016;
32:162-165. [PMID:
27862284 DOI:
10.1002/mds.26842]
[Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 09/14/2016] [Accepted: 09/16/2016] [Indexed: 11/08/2022] Open
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.
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