Genetic Testing Found Causes In Many Children With Epilepsy

What was studied

This study looked at whole-exome sequencing in 1,109 children with epilepsy at a single medical center. Whole-exome sequencing is a genetic test that reads many of the protein-coding parts of a person's DNA to look for changes that might explain disease.

The researchers reviewed the children's medical records and genetic test results to see how often the testing found a genetic diagnosis for epilepsy, which genes were involved, and which clinical features were associated with a higher chance of getting a genetic diagnosis.

What they found

A genetic diagnostic result was found in 405 of 1,109 children, for a diagnostic yield of 36.5%. The most commonly affected gene was SCN1A, followed by PRRT2 and SCN2A. Overall, the study identified 138 different genes.

Children were more likely to have a genetic diagnosis if their seizures started at a younger age, if they had developmental delay or intellectual disability, or if they had facial dysmorphisms. More than half of the children, 570 of 1,109 (51.4%), had a negative result, meaning the test did not identify a genetic diagnosis.

Limits of the evidence

This was a single-center study, so the results may not apply the same way to all clinics or populations. The study shows how often exome sequencing found an answer in this group, but it does not show how testing affects long-term outcomes or treatment for every child.

The abstract does not give details about the children's epilepsy types, backgrounds, or how uncertain genetic findings were handled.

For families and caregivers

For families, this study suggests that genetic testing can sometimes help identify a genetic explanation for a child’s epilepsy, especially when seizures begin early or when epilepsy occurs along with developmental delays, intellectual disability, or facial dysmorphisms. Getting a genetic answer may help with diagnosis and genetic counseling.

At the same time, many children in this study did not get a genetic diagnosis from exome sequencing, so families should know that an uninformative result was common in this group.

What to watch next

Stronger evidence would come from studies at multiple centers and from research that examines how genetic test results relate to clinical care and outcomes for children.

Terms in this summary

whole-exome sequencing

A genetic test that looks at many of the DNA regions that contain instructions for making proteins.

diagnostic yield

The percentage of tests that find an answer that explains the condition.

gene

A piece of DNA that carries instructions for how the body grows and works.

developmental delay

When a child reaches skills like talking, walking, or learning later than expected.

intellectual disability

A condition that affects learning, reasoning, and everyday functioning.

genetic counseling

Guidance from a trained professional about what genetic test results may mean for a person or family.