Supplementary Material for: Small RNA sequencing reveals exosomal miRNAs as unique feature markers in unprovoked venous thromboembolism

Introduction: Venous thromboembolism (VTE) is a common cardiovascular disease. miRNAs play a key role in VTE; however, the role of exosomal miRNAs in VTE remains unknown. Therefore, we aimed to identify key exosomal miRNAs and their potential mechanisms in VTE. Methods: We collected 31 samples from unprovoked VTE patients and 25 samples from healthy individuals. Exosomal miRNA sequencing was performed on 11 unprovoked VTE samples and 9 normal samples, and remaining samples to verify the expression level of candidate 9 miRNAs in VTE and normal samples. The sequencing data were used to analyze exosomal miRNA expression. Meanwhile, GO and KEGG analyses were performed to determine the potential biological functions of differentially expressed miRNA target genes. Results: A total of 32 differentially expressed miRNAs were identified by sequencing. Among the 32 miRNAs, 23 miRNAs were upregulated (72%), and 9 miRNAs were downregulated (28%). In addition, we found that the biological functions and metabolic pathways of the target genes were related to hemostatic factors involved in VTE, indicating the regulation of differentially expressed miRNAs. We identified key miRNAs by constructing a miRNA-mRNA regulatory network and found that the target genes were related to VTE. We finally determined that the abnormal expression of 9 miRNAs is closely related to VTE, and the expression level between VTE and normal was verified through other samples.