Genetic Cause Found In Hard-To-Treat Childhood Absence Seizures

What was studied

This report describes one child: a 12-year-old girl who presented at age 11 with daily absence seizures that did not respond to multiple antiseizure medicines.

Because the seizures were hard to treat, doctors considered a genetic cause. Whole exome sequencing found a heterozygous mutation in the SLC2A1 gene, confirming GLUT1 deficiency syndrome type 2. After starting a ketogenic diet, she showed significant clinical improvement.

What they found

In this single patient, refractory absence epilepsy was the presenting feature of GLUT1 deficiency syndrome type 2. Genetic testing identified an SLC2A1 mutation, and the girl showed significant clinical improvement after starting the ketogenic diet. The case highlights that some children with absence seizures that do not respond to medicine may have an underlying genetic or metabolic condition such as GLUT1 deficiency.

Limits of the evidence

This is only a case report of one patient, so it cannot show how common this is or whether all similar children will have the same cause or response. The abstract gives limited detail about how much she improved, how long she was followed, and whether she had other symptoms over time. Because it is not a comparison study, it cannot determine from this case alone what led to the improvement.

For families and caregivers

For families, this report is a reminder that when absence seizures are frequent and do not respond to usual medicines, doctors may sometimes consider genetic testing for rare causes. It also shows that finding the cause can matter, because treatment may be different; in GLUT1 deficiency, the ketogenic diet is described as the only treatment. This does not mean every child with absence epilepsy has this condition, but it may be worth discussing with a neurology team when seizures are hard to control.

What to watch next

Stronger evidence would come from larger studies of children with drug-resistant absence epilepsy to see how often GLUT1 deficiency is identified and how patients do with ketogenic therapy over time.

Terms in this summary

absence seizures

Brief seizures that often look like staring spells or pauses in awareness.

refractory

Hard to treat or not responding well to standard treatment.

SLC2A1 gene

The gene linked to the GLUT1 protein, which helps transport glucose into the brain.

GLUT1 deficiency syndrome

A rare genetic condition in which glucose transport across the blood-brain barrier is impaired.

whole exome sequencing

A genetic test that looks at many genes at once by reading the parts that contain protein-building instructions.

heterozygous mutation

A change in one copy of a gene pair.

ketogenic diet

A high-fat, very low-carbohydrate medical diet used in some seizure disorders.

autosomal dominant

A pattern where a change in just one copy of a gene can be enough for the condition to occur.