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Cortical Oscillations as an Endophenotype Mediating ApoE-ε2 Effects on Poststroke Functional Status.

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The apolipoprotein E (ApoE)-ε2 gene variant is linked to better stroke recovery. Cortical oscillations, specifically beta and theta power, mediate this effect, suggesting potential biomarkers for personalized stroke rehabilitation.

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Area of Science:

  • Neuroscience
  • Genetics
  • Stroke Recovery Research

Background:

  • Apolipoprotein E (ApoE)-ε2 is associated with favorable neurological outcomes.
  • Limited research exists on ApoE-ε2's role in stroke recovery.
  • ApoE-ε2 influences post-stroke cortical oscillations, which correlate with functional outcomes.

Purpose of the Study:

  • To investigate if cortical oscillations mediate the effect of ApoE-ε2 on post-stroke functional outcomes.
  • To explore ApoE-ε2 as a potential predictor of stroke recovery through brain activity.

Main Methods:

  • A cohort study involving 33 recent stroke patients.
  • Measured resting EEG activity, APOE genotype, and functional outcomes (GG scores).
  • Utilized ANCOVAs and partial Pearson correlations for mediation analysis of EEG cortical power.

Main Results:

  • ApoE-ε2 carriers exhibited higher ipsilesional beta power and lower ipsilesional theta power, both linked to better outcomes.
  • Mediation analysis showed ApoE-ε2 indirectly influenced functional outcome via ipsilesional M1 beta power (explaining 14%) and theta power (explaining 43%).
  • No significant mediation effects were found for other frequency bands or contralesional M1 power.

Conclusions:

  • ApoE-ε2 may promote a pro-repair environment, leading to favorable cortical dynamics post-stroke.
  • Cortical oscillatory activity serves as an endophenotype mediating ApoE-ε2's impact on functional recovery.
  • Cortical oscillations could be a biomarker for personalized stroke recovery interventions.