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Related Experiment Videos

Periventricular nodular heterotopia with overlying polymicrogyria.

Gretchen Wieck1, Richard J Leventer, Waney M Squier

  • 1Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.

Brain : a Journal of Neurology
|November 29, 2005
PubMed
Summary

Polymicrogyria (PMG) and periventricular nodular heterotopia (PNH) often co-occur in developmental brain malformations. This study identifies three subtypes of PNH-PMG, suggesting shared causes and potential X-linked inheritance.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Polymicrogyria (PMG) and periventricular nodular heterotopia (PNH) are distinct cortical malformations.
  • These conditions are independently associated with epilepsy and developmental delays.
  • Their co-occurrence suggests shared underlying pathophysiological mechanisms and genetic factors.

Purpose of the Study:

  • To describe the combined occurrence of PNH and PMG in a cohort of patients.
  • To classify subtypes of PNH-PMG based on neuroimaging findings.
  • To investigate potential genetic etiologies, including X-linked inheritance.

Main Methods:

  • Retrospective review of clinical data and brain imaging (MRI/neuropathology) for 30 patients with PNH and PMG.
  • Classification of patients into subtypes based on imaging patterns.

Related Experiment Videos

  • Mutation analysis of the FLNA gene in a subset of patients.

    • Main Results:

    • Identified three distinct PNH-PMG subtypes: frontal-perisylvian, posterior, and a third with severe microcephaly.
    • Frontal-perisylvian and posterior subtypes showed a male predominance, suggesting possible X-linked inheritance.
    • FLNA mutation analysis was performed on nine patients.

    Conclusions:

    • The co-occurrence of PNH and PMG defines specific malformation syndromes with distinct phenotypes.
    • These syndromes likely involve multiple genetic etiologies and a shared pathophysiological pathway.
    • Further delineation aids in diagnosis and prognosis for affected individuals.