A mutation in the low voltage-gated calcium channel CACNA1G alters the physiological properties of the channel, causing spinocerebellar ataxia

Mol Brain. 2015 Dec 29;8:89. doi: 10.1186/s13041-015-0180-4.

Abstract

Background: Spinocerebellar ataxia (SCA) is a genetically heterogeneous disease. To date, 36 dominantly inherited loci have been reported, and 31 causative genes have been identified.

Results: In this study, we analyzed a Japanese family with autosomal dominant SCA using linkage analysis and exome sequencing, and identified CACNA1G, which encodes the calcium channel CaV3.1, as a new causative gene. The same mutation was also found in another family with SCA. Although most patients exhibited the pure form of cerebellar ataxia, two patients showed prominent resting tremor in addition to ataxia. CaV3.1 is classified as a low-threshold voltage-dependent calcium channel (T-type) and is expressed abundantly in the central nervous system, including the cerebellum. The mutation p.Arg1715His, identified in this study, was found to be located at S4 of repeat IV, the voltage sensor of the CaV3.1. Electrophysiological analyses revealed that the membrane potential dependency of the mutant CaV3.1 transfected into HEK293T cells shifted toward a positive potential. We established induced pluripotent stem cells (iPSCs) from fibroblasts of the patient, and to our knowledge, this is the first report of successful differentiation from the patient-derived iPSCs into Purkinje cells. There was no significant difference in the differentiation status between control- and patient-derived iPSCs.

Conclusions: To date, several channel genes have been reported as causative genes for SCA. Our findings provide important insights into the pathogenesis of SCA as a channelopathy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Age of Onset
  • Aged
  • Asian Continental Ancestry Group / genetics
  • Calcium Channels, T-Type / genetics*
  • Calcium Channels, T-Type / physiology
  • Exome
  • Female
  • Fibroblasts / pathology
  • Genes, Dominant
  • Genetic Linkage
  • Genotype
  • HEK293 Cells
  • HeLa Cells
  • Humans
  • Induced Pluripotent Stem Cells / cytology
  • Japan
  • Male
  • Membrane Potentials
  • Middle Aged
  • Neurogenesis
  • Patch-Clamp Techniques
  • Pedigree
  • Purkinje Cells / cytology
  • Recombinant Fusion Proteins / metabolism
  • Spinocerebellar Ataxias / genetics*
  • Spinocerebellar Ataxias / physiopathology
  • Young Adult

Substances

  • CACNA1G protein, human
  • Calcium Channels, T-Type
  • Recombinant Fusion Proteins