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Biol Psychiatry. 2015 May 1;77(9):816-22. doi: 10.1016/j.biopsych.2014.11.020. Epub 2014 Dec 8.

CACNA1D de novo mutations in autism spectrum disorders activate Cav1.3 L-type calcium channels.

Author information

1
Department of Pharmacology and Toxicology, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria.
2
Institute of General, Inorganic and Theoretical Chemistry, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria.
3
Department of Pharmacology and Toxicology, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria.. Electronic address: joerg.striessnig@uibk.ac.at.

Abstract

BACKGROUND:

Cav1.3 voltage-gated L-type calcium channels (LTCCs) are part of postsynaptic neuronal signaling networks. They play a key role in brain function, including fear memory and emotional and drug-taking behaviors. A whole-exome sequencing study identified a de novo mutation, p.A749G, in Cav1.3 α1-subunits (CACNA1D), the second main LTCC in the brain, as 1 of 62 high risk-conferring mutations in a cohort of patients with autism and intellectual disability. We screened all published genetic information available from whole-exome sequencing studies and identified a second de novo CACNA1D mutation, p.G407R. Both mutations are present only in the probands and not in their unaffected parents or siblings.

METHODS:

We functionally expressed both mutations in tsA-201 cells to study their functional consequences using whole-cell patch-clamp.

RESULTS:

The mutations p.A749G and p.G407R caused dramatic changes in channel gating by shifting (~15 mV) the voltage dependence for steady-state activation and inactivation to more negative voltages (p.A749G) or by pronounced slowing of current inactivation during depolarizing stimuli (p.G407R). In both cases, these changes are compatible with a gain-of-function phenotype.

CONCLUSIONS:

Our data, together with the discovery that Cav1.3 gain-of-function causes primary aldosteronism with seizures, neurologic abnormalities, and intellectual disability, suggest that Cav1.3 gain-of-function mutations confer a major part of the risk for autism in the two probands and may even cause the disease. Our findings have immediate clinical relevance because blockers of LTCCs are available for therapeutic attempts in affected individuals. Patients should also be explored for other symptoms likely resulting from Cav1.3 hyperactivity, in particular, primary aldosteronism.

KEYWORDS:

Autism spectrum disorders; Calcium channel blockers; Human genetics; L-type calcium channels; Neuropsychiatric disorders; Whole-exome sequencing

PMID:
25620733
PMCID:
PMC4401440
DOI:
10.1016/j.biopsych.2014.11.020
[Indexed for MEDLINE]
Free PMC Article

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