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Pyridoxine-dependent epilepsy: an under-recognised cause of intractable seizures

Nune S Yeghiazaryan1, Federico Zara, Giuseppe Capovilla

  • 1Armenian Republican Epilepsy Centre Erebouni, Yerevan State Medical University, Yerevan, Armenia. ynune@yahoo.com

Journal of Paediatrics and Child Health
|April 19, 2011
PubMed

Insights

Pyridoxine-dependent epilepsy (PDE) is a rare genetic disorder causing severe infant seizures. Early pyridoxine treatment is crucial for managing this condition, even when other therapies fail.

Area of Science:

  • Biochemistry
  • Genetics
  • Neurology

Background:

  • Pyridoxine-dependent epilepsy (PDE) is a rare autosomal recessive disorder.
  • It causes intractable seizures in neonates and infants, often resistant to standard anti-epileptic drugs.

Observation:

  • Patients with PDE typically respond well to pyridoxine administration.
  • Seizure types vary, with status epilepticus being common.
  • Electroencephalographic and neuroimaging findings are not specific for PDE.

Findings:

  • Elevated urinary α-aminoadipic semialdehyde is a reliable biomarker for PDE.
  • Mutations in the ALDH7A1 gene are found in most PDE patients.
  • ALDH7A1 encodes α-aminoadipic semialdehyde dehydrogenase.

Implications:

  • Early consideration of a pyridoxine trial is paramount for infants with intractable early-onset seizures.
  • Identifying PDE is critical for appropriate and timely treatment.
  • Intellectual disability is a frequent long-term outcome if not treated promptly.

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