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Relationship between environmental factors and gray matter atrophy in refractory MTLE

C L Yasuda1, M E Morita, A Alessio

  • 1Department of Neurology, University of Campinas, Cidade Universitaria, Campinas, SP, Brazil 13083-970.

Neurology
|March 31, 2010
PubMed
Abstract

Insights

Patients with mesial temporal lobe epilepsy (MTLE) and no family history of epilepsy showed more widespread brain atrophy and lower IQ. This suggests a greater environmental influence in these cases compared to those with a positive family history.

Area of Science:

  • Neurology
  • Neuroimaging
  • Epilepsy Research

Background:

  • Mesial temporal lobe epilepsy (MTLE) is a common form of epilepsy.
  • Understanding the interplay of genetic and environmental factors in MTLE is crucial for treatment.
  • Familial history (FH) may indicate differing underlying etiologies in MTLE.

Purpose of the Study:

  • To compare clinical, neuropsychological, and MRI (gray matter atrophy [GMA] and white matter atrophy [WMA]) findings in surgical MTLE patients with and without a familial history of epilepsy.
  • To investigate the influence of genetic versus environmental factors in MTLE pathogenesis.

Main Methods:

  • A cohort study of 69 operated unilateral MTLE patients (29 negative FH, 40 positive FH).
  • Voxel-based morphometry (VBM) analysis of preoperative MRIs to assess GMA and WMA.
  • Clinical and neuropsychological assessments, including IQ and Boston Naming Test, were performed.

Main Results:

  • The negative-FH group exhibited lower IQ scores, poorer performance on naming and delayed recall tasks, and a more asymmetric hippocampal volume.
  • VBM revealed a more restricted GMA pattern in the positive-FH group.
  • The negative-FH group showed a more bilateral and widespread GMA pattern across multiple brain lobes, alongside frequent initial precipitating injuries.

Conclusions:

  • Widespread structural abnormalities and poorer cognitive performance in the negative-FH group suggest a stronger environmental influence, including initial injuries.
  • Positive-FH MTLE may be driven by stronger genetic predisposition with less environmental impact.
  • Findings support distinct pathogenic pathways in MTLE based on familial history.

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