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Elevated delta power in EEG is a key biomarker for SLC6A1-related neurodevelopmental disorder (SLC6A1-NDD). This finding aids in diagnosing this rare epilepsy condition and understanding its progression.

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Area of Science:

  • Neuroscience
  • Genetics
  • Biomarker Discovery

Background:

  • SLC6A1-related neurodevelopmental disorder (SLC6A1-NDD) is an epileptic encephalopathy linked to mutations in the SLC6A1 gene.
  • Characterized by early-onset seizures and developmental delays, SLC6A1-NDD's electrophysiological changes are not fully understood.

Purpose of the Study:

  • Identify electrophysiological biomarkers for SLC6A1-NDD.
  • Characterize EEG delta power using automated tools (EEGLAB, Persyst).
  • Explore age- and state-related effects on delta power.

Main Methods:

  • Analyzed EEG recordings from 20 SLC6A1-NDD patients and 20 controls.
  • Quantified delta power using EEGLAB and Persyst.
  • Utilized Wilcoxon signed-rank test, AUC, and Pearson's correlation for analysis.

Main Results:

  • SLC6A1-NDD patients showed significantly elevated delta power (19.4 ± 4.1) versus controls (14.2 ± 3.0).
  • Delta power increased with age in patients (b=0.5) but decreased in controls (b=-1.0).
  • Delta activity frequency differentiated patients from controls in wake epochs (AUC=0.93).

Conclusions:

  • Elevated delta power is a significant feature of SLC6A1-NDD.
  • Quantitative EEG analysis is feasible across platforms, but standardization is needed.
  • Future research should validate findings in larger cohorts and compare with other encephalopathies.