GABRA1-Related Disorders: From Genetic to Functional Pathways
Elisa Musto1,2,3, Vivian W Y Liao4, Katrine M Johannesen1,5
1Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Center, Dianalund, Denmark.
Annals of Neurology
|August 22, 2023
Summary
Genetic variants in GABRA1 cause a spectrum of epilepsies. Loss-of-function variants in certain regions lead to milder epilepsy, while gain-of-function variants in transmembrane helices cause severe neurodevelopmental disorders.
Area of Science:
- Neuroscience
- Genetics
- Epilepsy Research
Background:
- GABRA1 variants are linked to diverse epilepsy types, from generalized epilepsies to developmental and epileptic encephalopathies.
- Current understanding of genotype-phenotype correlations and optimal treatments for GABRA1-related disorders is insufficient.
Purpose of the Study:
- To analyze electroclinical features and functional effects of GABRA1 variants.
- To establish genotype-phenotype correlations for GABRA1-related epilepsies.
Main Methods:
- Collected genetic and electroclinical data from 27 individuals with 20 different GABRA1 variants.
- Performed functional analysis for 19 of the identified GABRA1 variants.
Main Results:
- Phenotype severity correlated with variant location and functional effect.
- Variants in extracellular domains/transmembrane loops with loss-of-function (LoF) effects were associated with milder epilepsy and favorable outcomes.
- Variants in pore-forming transmembrane helices, including gain-of-function (GoF) and LoF, were linked to severe early-onset neurodevelopmental disorders and epileptic encephalopathies.
Conclusions:
- Delineated specific subphenotypes for LoF and GoF GABRA1 variants, expanding the known spectrum.
- Transmembrane helix variants, particularly GoF variants, generally result in more severe phenotypes.
- Findings support a precision medicine approach for GABRA1-related disorders by clarifying pathomechanisms.
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