Glucose transporter type I deficiency causing mitochondrial dysfunction.

Area of Science:

• Neurology
• Genetics
• Metabolic Disorders

Background:

• Mitochondrial disorders present diverse clinical symptoms and pathogenesis.
• Diagnosis often relies on clinical presentation, with genetic causes frequently unidentified.
• Complex I deficiency is a known cause of mitochondrial disease, leading to seizures and developmental delay.

Observation:

• A 6-year-old female experienced seizures and developmental delay, diagnosed with mitochondrial disorder.
• Hypoglycorrhachia (low cerebrospinal fluid glucose) suggested glucose transporter deficiency.
• Genetic analysis revealed a mutation in the solute carrier family 2, facilitated glucose transporter member 1 (SLCA2) gene.

Findings:

• The patient's mitochondrial disorder was genetically confirmed to be caused by an SLCA2 gene mutation.
• This specific genetic defect impairs glucose transport to the brain.
• Delayed diagnosis and treatment were noted in this case.

Implications:

• Early identification of SLCA2 gene mutations is vital for prompt intervention in mitochondrial disorders.
• Timely treatment could potentially prevent or mitigate neurological sequelae.
• This case highlights the importance of considering genetic glucose transporter defects in unexplained neurological conditions.