Myoclonus dystonia and muscular dystrophy: ɛ-sarcoglycan is part of the dystrophin-associated protein complex in brain

Waite, Adrian J., Carlisle, Francesca A. ORCID: https://orcid.org/0000-0002-9734-113X, Chan, Yiumo Michael and Blake, Derek J. ORCID: https://orcid.org/0000-0002-5005-4731 2016. Myoclonus dystonia and muscular dystrophy: ɛ-sarcoglycan is part of the dystrophin-associated protein complex in brain. Movement Disorders 31 (11) , pp. 1694-1703. 10.1002/mds.26738

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Abstract

BACKGROUND: Myoclonus-dystonia is a neurogenic movement disorder caused by mutations in the gene encoding ɛ-sarcoglycan. By contrast, mutations in the α-, β-, γ-, and δ-sarcoglycan genes cause limb girdle muscular dystrophies. The sarcoglycans are part of the dystrophin-associated protein complex in muscle that is disrupted in several types of muscular dystrophy. Intriguingly, patients with myoclonus-dystonia have no muscle pathology; conversely, limb-girdle muscular dystrophy patients have not been reported to have dystonia-associated features. To gain further insight into the molecular mechanisms underlying these differences, we searched for evidence of a sarcoglycan complex in the brain. METHODS: Immunoaffinity chromatography and mass spectrometry were used to purify ubiquitous and brain-specific ɛ-sarcoglycan directly from tissue. Cell models were used to determine the effect of mutations on the trafficking and assembly of the brain sarcoglycan complex. RESULTS: Ubiquitous and brain-specific ɛ-sarcoglycan isoforms copurify with β-, δ-, and ζ-sarcoglycan, β-dystroglycan, and dystrophin Dp71 from brain. Incorporation of a muscular dystrophy-associated β-sarcoglycan mutant into the brain sarcoglycan complex impairs the formation of the βδ-sarcoglycan core but fails to abrogate the association and membrane trafficking of ɛ- and ζ-sarcoglycan. CONCLUSIONS: ɛ-Sarcoglycan is part of the dystrophin-associated protein complex in brain. Partial preservation of ɛ- and ζ-sarcoglycan in brain may explain the absence of myoclonus dystonia-like features in muscular dystrophy patients. © 2016 International Parkinson and Movement Disorder Society.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects:	R Medicine > R Medicine (General)
Uncontrolled Keywords:	DYT11; dystonia; sarcoglycan
Publisher:	Wiley
ISSN:	0885-3185
Funders:	MRC
Date of First Compliant Deposit:	24 August 2016
Date of Acceptance:	27 June 2016
Last Modified:	08 May 2023 05:14
URI:	https://orca.cardiff.ac.uk/id/eprint/94007

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