Six Children With Rare Gene-Linked Epilepsy Described

What was studied

Researchers reviewed trio-WES/WES results from 886 individuals with unexplained epilepsy evaluated from 2018 to 2023. They focused on 6 unrelated patients in China who had pathogenic or likely pathogenic variants in GABAA receptor subunit genes, specifically GABRA1 or GABRG2.

They analyzed each patient’s clinical phenotype, treatment, and genotype. The study also used computational predictions to assess how the variants might affect the receptor protein.

What they found

The study identified 6 variants in total: 4 in GABRA1 and 2 in GABRG2. Three of these variants were novel. Four patients had developmental and epileptic encephalopathy, and two had genetic epilepsy with febrile seizures plus. One patient had drug-resistant epilepsy, while the other 5 achieved stable seizure control with treatment, most commonly valproate and levetiracetam. The authors reported marked clinical heterogeneity and suggested that phenotype may relate to variant type and location.

Limits of the evidence

This was a very small study with only 6 patients, so genotype-phenotype correlations remain unclear. All patients were identified from a larger group with unexplained epilepsy in one country, so the findings may not apply broadly to all people with epilepsy. The reported protein effects were based on computational predictions rather than direct functional testing. Because this was a descriptive case series, it cannot determine which medicines work best for these gene-related epilepsies.

For families and caregivers

For families, this study adds to the reported spectrum of pathogenic variants in GABRA1 and GABRG2 and describes epilepsy presentations ranging from genetic epilepsy with febrile seizures plus to developmental and epileptic encephalopathy. It also reports that several patients achieved stable seizure control with treatment, although one had drug-resistant epilepsy. These findings may help inform clinical diagnosis and genetic counseling, but the study is too small to predict an individual child’s course or best treatment.

What to watch next

Larger collaborative studies are needed to better clarify genotype-phenotype correlations, and functional studies could help test how specific variants affect receptor function.

Terms in this summary

GABAA receptor

A protein in the brain that helps nerve cells slow down their activity.

gene variant

A change in DNA; some variants are harmless, while others can cause disease.

GABRA1

A gene that helps make one part of the GABAA receptor.

GABRG2

Another gene that helps make one part of the GABAA receptor.

developmental and epileptic encephalopathy

A group of severe epilepsies in which seizures and brain dysfunction can affect development.

genetic epilepsy with febrile seizures plus

An inherited epilepsy syndrome in which febrile seizures may continue beyond the usual age or occur along with other seizure types.

drug-resistant epilepsy

Epilepsy that does not come under control after trying appropriate seizure medicines.

genetic counseling

Guidance from a health professional about what genetic test results may mean for a person and family.