Exosomal miR-320c: A Novel Biomarker for Atrial Cardiomyopathy.

Early diagnosis and treatment of atrial cardiomyopathy(ACM) are crucial for patients with atrial fibrillation(AF), and further exploration of its biomarkers remains necessary. High-throughput sequencing of exosomal miRNAs was performed on blood samples from patients with persistent AF (PeAF) exhibiting mild and severe left atrial fibrosis, with supraventricular tachycardia (SVT) patients. Quantitative real-time reverse transcription polymerase chain reaction analysis validated differentially expressed miRNAs (DE miRNAs) from severe left atrial fibrosis PeAF, SVT and health controls. Gene Ontology and Kyoto Encyclopedia of Genes and Genomes analyses were conducted on target genes. Four exosomal DE miRNAs were identified, including miR-5106, let-7e-5p, miR-320c, and miR-382-3p. Exosomal miR-320c was down-regulated in severe left atrial fibrosis PeAF patients, while the other three miRNAs showed no significant changes. Exosomal miR-320c emerges as a potential biomarker for severe left atrial fibrosis and ACM, suggesting its suitability as a therapeutic target.