A Gain-of-Function Mutation in KCNMA1 Causes Dystonia Spells Controlled With Stimulant Therapy.

Journal Article (Journal Article)

BACKGROUND: The mutations of KCNMA1 BK-type K+ channel have been identified in patients with various movement disorders. The underlying pathophysiology and corresponding therapeutics are lacking. OBJECTIVES: To report our clinical and biophysical characterizations of a novel de novo KCNMA1 variant, as well as an effective therapy for the patient's dystonia-atonia spells. METHODS: Combination of phenotypic characterization, therapy, and biophysical characterization of the patient and her mutation. RESULTS: The patient had >100 dystonia-atonia spells per day with mild cerebellar atrophy. She also had autism spectrum disorder, intellectual disability, and attention deficit hyperactivity disorder. Whole-exome sequencing identified a heterozygous de novo BK N536H mutation. Our biophysical characterization demonstrates that N536H is a gain-of-function mutation with markedly enhanced voltage-dependent activation. Remarkably, administration of dextroamphetamine completely suppressed the dystonia-atonia spells. CONCLUSIONS: BK N536H is a gain-of-function that causes dystonia and other neurological symptoms. Our stimulant therapy opens a new avenue to mitigate KCNMA1-linked movement disorders. © 2020 International Parkinson and Movement Disorder Society.

Full Text

Duke Authors

Cited Authors

  • Zhang, G; Gibson, RA; McDonald, M; Liang, P; Kang, PW; Shi, J; Yang, H; Cui, J; Mikati, MA

Published Date

  • October 2020

Published In

Volume / Issue

  • 35 / 10

Start / End Page

  • 1868 - 1873

PubMed ID

  • 32633875

Pubmed Central ID

  • PMC7572833

Electronic International Standard Serial Number (EISSN)

  • 1531-8257

Digital Object Identifier (DOI)

  • 10.1002/mds.28138


  • eng

Conference Location

  • United States