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CaV3.3 Channelopathies

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Voltage-gated Ca2+ Channels: Pharmacology, Modulation and their Role in Human Disease

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 279))

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Abstract

CaV3.3 is the third member of the low-voltage-activated calcium channel family and the last to be recognized as disease gene. Previously, CACNA1I, the gene encoding CaV3.3, had been described as schizophrenia risk gene. More recently, de novo missense mutations in CACNA1I were identified in patients with variable degrees of neurodevelopmental disease with and without epilepsy. Their functional characterization indicated gain-of-function effects resulting in increased calcium load and hyperexcitability of neurons expressing CaV3.3. The amino acids mutated in the CaV3.3 disease variants are located in the vicinity of the channel’s activation gate and thus are classified as gate-modifying channelopathy mutations. A persistent calcium leak during rest and prolonged calcium spikes due to increased voltage sensitivity of activation and slowed kinetics of channel inactivation, respectively, may be causal for the neurodevelopmental defects. The prominent expression of CaV3.3 in thalamic reticular nucleus neurons and its essential role in generating the rhythmic thalamocortical network activity are consistent with a role of the mutated channels in the etiology of epileptic seizures and thus suggest T-type channel blockers as a viable treatment option.

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  1. Institute of Physiology, Medical University Innsbruck, Innsbruck, Austria

    Yousra El Ghaleb & Bernhard E. Flucher

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  1. Yousra El Ghaleb
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Correspondence to Bernhard E. Flucher .

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  1. Center for Chemistry and Biomedicine, UI, Pharmacology and Toxicology, Innsbruck, Austria

    Jörg Striessnig

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El Ghaleb, Y., Flucher, B.E. (2023). CaV3.3 Channelopathies. In: Striessnig, J. (eds) Voltage-gated Ca2+ Channels: Pharmacology, Modulation and their Role in Human Disease. Handbook of Experimental Pharmacology, vol 279. Springer, Cham. https://doi.org/10.1007/164_2022_631

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