The De Novo CACNA1A Pathogenic Variant Y1384C Associated with Hemiplegic Migraine, Early Onset Cerebellar Atrophy and Developmental Delay Leads to a Loss of Cav2.1 Channel Function

Overview

Journal Mol Brain

Publisher Biomed Central

Specialties Molecular Biology
Neurology

Date 2021 Feb 9

PMID 33557884

Citations 12

Authors

Maria A Gandini

Ivana A Souza

Laurent Ferron

A Micheil Innes

Gerald W Zamponi

Affiliations

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Abstract

CACNA1A pathogenic variants have been linked to several neurological disorders including familial hemiplegic migraine and cerebellar conditions. More recently, de novo variants have been associated with severe early onset developmental encephalopathies. CACNA1A is highly expressed in the central nervous system and encodes the pore-forming Caα subunit of P/Q-type (Cav2.1) calcium channels. We have previously identified a patient with a de novo missense mutation in CACNA1A (p.Y1384C), characterized by hemiplegic migraine, cerebellar atrophy and developmental delay. The mutation is located at the transmembrane S5 segment of the third domain. Functional analysis in two predominant splice variants of the neuronal Cav2.1 channel showed a significant loss of function in current density and changes in gating properties. Moreover, Y1384 variants exhibit differential splice variant-specific effects on recovery from inactivation. Finally, structural analysis revealed structural damage caused by the tyrosine substitution and changes in electrostatic potentials.

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