Characterization of Plasma Extrachromosomal Circular DNA in Gouty Arthritis

Area of Science:

• Genomics
• Molecular Biology
• Immunology

Background:

• Extrachromosomal circular DNA elements (eccDNAs) are prevalent in cells and plasma.
• Their potential roles in biological processes, including disease, are largely unexplored.
• Gouty arthritis is a metabolic inflammatory disease with complex pathogenesis.

Purpose of the Study:

• To identify potentially functional or marked eccDNAs in plasma from gout patients.
• To investigate the genomic distribution and gene annotations of eccDNAs in gout.
• To explore the association of eccDNAs with gout pathogenesis.

Main Methods:

• Plasma samples from acute gout patients and healthy controls were analyzed using the Circle-Seq approach for eccDNA detection.
• Detected eccDNAs were mapped to the reference genome to analyze genomic element distribution and gene annotations.
• Functional enrichment analysis was performed on gout-unique eccDNA-associated genes.

Main Results:

• A significant number of eccDNAs were detected in both gout patients and healthy controls.
• No significant difference in eccDNA genomic element annotation was observed between groups.
• 256 gout-unique eccDNA-associated genes were identified, including COL1A1 and EPB42, implicated in hyperuricemia, inflammation, and immune responses.
• Enrichment analysis revealed correlations with defense, stress, immune, and inflammatory responses, including specific signaling pathways.

Conclusions:

• Plasma eccDNAs represent a novel source for understanding gout pathogenesis.
• Specific eccDNA-associated genes in gout patients are linked to key inflammatory and immune pathways.
• These findings highlight the potential biological roles of plasma eccDNAs in gouty arthritis.