Epigenome-wide DNA methylation patterns associated with disease activity in systemic lupus erythematosus

Area of Science:

• Immunology and Genetics
• Epigenetics

Background:

• Systemic lupus erythematosus (SLE) is a complex autoimmune disease with varied clinical presentations.
• DNA methylation alterations are implicated in SLE pathogenesis, but their link to disease activity is not fully understood.

Purpose of the Study:

• To identify genome-wide DNA methylation patterns associated with disease activity in women with SLE.
• To explore potential epigenetic biomarkers for monitoring SLE activity.

Main Methods:

• Whole blood DNA from 48 women with SLE was analyzed using Illumina EPIC arrays.
• Disease activity was assessed using the Systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI-2K).
• Differentially methylated positions (DMPs) and regions (DMRs) were identified using linear modeling and region-level analyses, with adjustments for covariates.

Main Results:

• No individual CpGs reached FDR-corrected significance; a hypothesis-generating approach identified over 4,500 suggestive DMPs (p < 0.01).
• Thirty-six significant DMRs (1% FDR) were detected, mapping to genes involved in immune and neuroimmune regulation.
• Motif analysis revealed enrichment of the REST binding motif in several DMRs, suggesting a role for this transcriptional repressor.

Conclusions:

• Exploratory analysis suggests potential epigenome-wide methylation changes linked to SLE disease activity in women.
• Region-level analysis highlights DMRs in immune and neuroimmune pathways, enriched for REST binding sites.
• These preliminary findings require validation but point to candidate epigenetic alterations and pathways for further SLE research.