Early-Onset Absence Epilepsy Caused by Mutations in the Glucose Transporter GLUT1
Arvid Suls, Saul A Mullen, Yvonne G Weber, Kristien Verhaert, Berten Ceulemans, Renzo Guerrini, Thomas V Wuttke, Alberto Salvo-Vargas, Liesbet Deprez, Lieve RF Claes, Albena Jordanova, Samuel F Berkovic, Holger Lerche, Peter De Jonghe, Ingrid E Scheffer
ANNALS OF NEUROLOGY | WILEY | Published : 2009
Absence epilepsies of childhood are heterogeneous with most cases following complex inheritance. Those cases with onset before 4 years of age represent a poorly studied subset. We screened 34 patients with early-onset absence epilepsy for mutations in SLC2A1, the gene encoding the GLUT1 glucose transporter. Mutations leading to reduced protein function were found in 12% (4/34) of patients. Two mutations arose de novo, and two were familial. These findings suggest GLUT1 deficiency underlies a significant proportion of early-onset absence epilepsy, which has both genetic counseling and treatment implications because the ketogenic diet is effective in GLUT1 deficiency.