Spinocerebellar ataxia type 19/22 mutations alter heterocomplex Kv4.3 channel function and gating in a dominant manner

Anna Duarri Pique, Meng-Chin A. Lin, Michiel R. Fokkens, Michel Meijer, Cleo J. L. M. Smeets, Esther A. R. Nibbeling, Erik Boddeke, Richard J. Sinke, Harm H. Kampinga, Diane M. Papazian, Dineke S. Verbeek*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

18 Citaten (Scopus)
197 Downloads (Pure)

Samenvatting

The dominantly inherited cerebellar ataxias are a heterogeneous group of neurodegenerative disorders caused by Purkinje cell loss in the cerebellum. Recently, we identified loss-of-function mutations in the KCND3 gene as the cause of spinocerebellar ataxia type 19/22 (SCA19/22), revealing a previously unknown role for the voltage-gated potassium channel, Kv4.3, in Purkinje cell survival. However, how mutant Kv4.3 affects wild-type Kv4.3 channel functioning remains unknown. We provide evidence that SCA19/22-mutant Kv4.3 exerts a dominant negative effect on the trafficking and surface expression of wild-type Kv4.3 in the absence of its regulatory subunit, KChIP2. Notably, this dominant negative effect can be rescued by the presence of KChIP2. We also found that all SCA19/22-mutant subunits either suppress wild-type Kv4.3 current amplitude or alter channel gating in a dominant manner. Our findings suggest that altered Kv4.3 channel localization and/or functioning resulting from SCA19/22 mutations may lead to Purkinje cell loss, neurodegeneration and ataxia.

Originele taal-2English
Pagina's (van-tot)3387-3399
Aantal pagina's13
TijdschriftCellular and molecular life sciences
Volume72
Nummer van het tijdschrift17
DOI's
StatusPublished - sep-2015

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