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Glut1 deficiency: when to suspect and how to diagnose?
A Verrotti1, C D'Egidio, S Agostinelli
1Department of Paediatrics, University of Chieti, Ospedale policlinico SS. Annunziata, Via dei Vestini 5, 66100 Chieti, Italy. averrott@unich.it
Summary
Glucose transporter type 1 deficiency syndrome (GLUT1-DS) impairs brain glucose transport, causing developmental issues and seizures. A ketogenic diet can significantly improve symptoms in affected individuals.
Area of Science:
- Neurology
- Metabolic Disorders
- Genetics
Background:
- Glucose transporter type 1 deficiency syndrome (GLUT1-DS) is caused by impaired glucose transport across the blood-brain barrier.
- Classic GLUT1-DS presents with infantile seizures, developmental delay, microcephaly, and hypoglycorrhachia.
- Atypical variants include movement disorders and paroxysmal exertion-induced dyskinesia.
Purpose of the Study:
- To review recent advances in understanding GLUT1-DS.
- To highlight diagnostic approaches for GLUT1-DS.
- To outline therapeutic strategies for GLUT1-DS.
Main Methods:
- Diagnosis relies on low cerebrospinal fluid glucose (without hypoglycemia).
- Confirmation involves molecular analysis of the GLUT1 gene.
- Further confirmation includes erythrocyte glucose uptake and immunoreactivity studies.
Main Results:
- GLUT1-DS exhibits a variable phenotype, including atypical presentations.
- Genetic basis includes de novo mutations and autosomal dominant/recessive transmission.
- Ketogenic diet therapy shows significant efficacy.
Conclusions:
- Early diagnosis and intervention are crucial for managing GLUT1-DS.
- Molecular and functional studies aid in diagnosis.
- Dietary management, particularly the ketogenic diet, is effective.
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