Circulating cell-free DNA methylation mirrors alterations in cerebral patterns in epilepsy

Area of Science:

• Epigenetics
• Neuroscience
• Biomarker Discovery

Background:

• DNA methylation profiling of circulating cell-free DNA (cfDNA) is a developing strategy for biomarker identification.
• Previous work identified significant DNA methylation alterations in brain tissue from mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) patients.
• cfDNA methylation patterns may serve as non-invasive biomarkers for local tissue alterations.

Purpose of the Study:

• To investigate cfDNA methylation patterns in serum from MTLE patients compared to healthy controls.
• To determine if cfDNA methylation alterations reflect known hippocampal alterations in MTLE-HS.
• To assess the utility of cfDNA methylation for non-invasive epilepsy biomarker development.

Main Methods:

• DNA methylation profiling of serum cfDNA using BeadChip arrays.
• Bioinformatic analysis including deconvolution and integration with DNase accessibility data.
• Comparison of cfDNA methylation patterns between MTLE patients and healthy controls.

Main Results:

• Differential cfDNA methylation analysis revealed enrichment of terms related to central nervous system function.
• Deconvolution analysis excluded changes in cortical neuron contribution as the cause of observed differences.
• MTLE-HS cfDNA methylation patterns significantly reflected previously identified hippocampal epileptic alterations.

Conclusions:

• cfDNA methylation profiling is a viable approach for identifying non-invasive epilepsy biomarkers.
• The findings support the potential for using cfDNA methylation to detect neurological alterations.
• This method offers a reproducible strategy for biomarker discovery in epilepsy.