Association between CACNA1A and ATP1A2 Variants are Responsible for Severe Neurodevelopmental Disorder

Area of Science:

• Genetics
• Neuroscience
• Molecular Biology

Background:

• The ATP1A2 and CACNA1A genes encode critical proteins for neuronal function: the Na+/K+-ATPase transporter and voltage-gated calcium channels, respectively.
• Pathogenic variants in these genes are linked to neurological conditions including hemiplegic migraines, movement disorders, and developmental and epileptic encephalopathies.

Purpose of the Study:

• To investigate the genetic basis of epileptic encephalopathy with cognitive and behavioral issues in a child.
• To explore the potential synergistic effect of variants in ATP1A2 and CACNA1A genes on neurodevelopmental disorders (NDDs).

Main Methods:

• Comprehensive genetic analysis including whole exome sequencing (WES).
• Array comparative genomic hybridization (aCGH) to detect copy number variations.
• Screening for Fragile X and Prader-Willi/Angelman syndromes.

Main Results:

• A likely pathogenic variant in the ATP1A2 gene was identified in the child, inherited from a mother with hemiplegic migraines.
• A variant of uncertain significance in the CACNA1A gene was found in the child, inherited from an asymptomatic father and also present in a brother with a milder NDD.
• No other significant genetic variations were detected, supporting the focus on ATP1A2 and CACNA1A.

Conclusions:

• The study suggests a potential synergistic interaction between ATP1A2 and CACNA1A gene variants in the pathogenesis of NDDs.
• This case illustrates the complex genetic underpinnings of neurodevelopmental disorders, where combined variants may lead to varied clinical presentations.