Usefulness of diagnostic tools in a GLUT1 deficiency syndrome patient with 2 inherited mutations.

Unlabelled: In some patients with GLUT1 deficiency syndrome (GLUT1-DS), the diagnosis can be difficult to reach. We report a child with 2 inherited mutations suggesting an autosomal recessive transmission of SLC2A1 mutations.

Methods: The child and her parents were explored with erythrocyte 3-O-methyl-d-Glucose uptake, glucose uptake in oocytes expressing GLUT1 with the gene mutations and measure of the expression of GLUT1 at the surface of the circulating red blood cells by flow cytometry (METAglut1™ test).

Development of a rapid functional assay that predicts GLUT1 disease severity.

Objective: To examine the genotype to phenotype connection in glucose transporter type 1 (GLUT1) deficiency and whether a simple functional assay can predict disease outcome from genetic sequence alone.

Methods: GLUT1 deficiency, due to mutations in , causes a wide range of epilepsies. One possible mechanism for this is variable impact of mutations on GLUT1 function.