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Early-onset progressive myoclonic epilepsy with dystonia mapping to 16pter-p13.3

Nadire Duru1, Sibel Aylin Ugur Iseri, Nilgün Selçuk

  • 1Department of Molecular Biology and Genetics, Boğaziçi University, Istanbul, Turkey.

Journal of Neurogenetics
|November 20, 2010
PubMed

Insights

A novel, severe form of progressive myoclonic epilepsy with dystonia (PMED) was identified in a consanguineous family. This early-onset, fatal genetic epilepsy presents unique neurological and autonomic features.

Area of Science:

  • Genetics
  • Neurology

Background:

  • Describes a novel genetic disorder, progressive myoclonic epilepsy with dystonia (PMED).
  • Highlights the consanguineous nature of the affected family, suggesting a recessive inheritance pattern.

Observation:

  • Presents three patients with very early onset (infancy) and progressive, fatal course (death within the first decade).
  • Characterizes the epilepsy by myoclonic seizures, dystonias, postictal hemipareses, autonomic dysfunction, obtundation, and lethargy.
  • Notes developmental and neurological retardation, systemic infections, and overall deterioration.

Findings:

  • A genome scan localized the disease gene to a 6.73 Mb region on the p-terminus of chromosome 16.
  • Achieved a maximum multipoint logarithm-of-odds score of 7.83, indicating significant linkage.
  • Analysis of a candidate gene revealed no mutations in the affected patients.

Implications:

  • Identifies a specific chromosomal region linked to this severe, early-onset epilepsy syndrome.
  • Suggests the causative gene may be within the identified locus but was not among the initial candidates.
  • Underscores the need for further genetic investigation to identify the causative mutation for PMED.

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