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Updated: Jan 17, 2026
Isolation of Small Noncoding RNAs from Human Serum
Published on: June 19, 2014
Small-RNA sequencing identifies serum microRNAs associated with abnormal electrocardiography findings in patients
Michael Mueller1, Alice Blandino2, Dominique Scherer2
1Statistical Genetics Research Group, Institute of Medical Biometry, Heidelberg University, Heidelberg, Germany; Hopp Children's Cancer Center Heidelberg (KiTZ), Heidelberg Medical Faculty and Faculty of Biosciences, Heidelberg University, 69120 Heidelberg, Germany.
Insights
Circulating miRNAs show potential as biomarkers for Chagas cardiomyopathy. Lower serum levels of specific miRNAs correlate with disease severity, aiding in understanding Chagas disease complications.
Area of Science:
- Cardiovascular Research
- Infectious Diseases
- Molecular Biology
Background:
- Chagas disease, caused by Trypanosoma cruzi (T. cruzi), impacts millions globally, with cardiomyopathy being a major complication.
- Cardiac issues in chronic Chagas disease include arrhythmias, heart failure, and sudden cardiac death.
- Understanding the T. cruzi-cardiomyopathy link is crucial for early diagnosis and treatment.
Purpose of the Study:
- To identify circulating microRNAs (miRNAs) as potential biomarkers for Chagas cardiomyopathy.
- To investigate the association between miRNA expression and disease severity indicators like electrocardiography (ECG) abnormalities and Kuschnir scores.
- To explore the relationship between miRNA expression, genotype, and the risk of abnormal ECG findings.
Main Methods:
- Small RNA sequencing was performed on serum samples from 228 Chagas patients.
- Bioinformatic analysis quantified serum miRNA expression.
- Robust logistic regression identified differentially expressed miRNAs in patients with ECG abnormalities and high Kuschnir scores.
Main Results:
- Three miRNAs (miRNA-101-3p, miRNA-576-3p, miRNA-629-5p) showed significantly lower serum expression in patients with abnormal ECG (p < 0.0002).
- Lower expression was particularly noted in patients with high Kuschnir scores.
- miRNA-629-5p expression negatively correlated with CCL5, a chemokine implicated in Chagas disease; gene enrichment analysis suggested cytokine signaling involvement.
Conclusions:
- Circulating miRNAs hold promise as diagnostic biomarkers for Chagas cardiomyopathy.
- Identified miRNA associations with disease severity and immune response enhance understanding of Chagas disease complications.
- Further research into these miRNAs could improve diagnostic and prognostic strategies for Chagas cardiomyopathy.
Background:
Chagas disease, caused by the parasite Trypanosoma cruzi (T. cruzi), affects around 6-7 million people in Latin America and hundreds of thousands in the United States and Europe. A main complication of chronic Chagas disease is cardiomyopathy, possibly manifesting as arrhythmias, heart failure, or sudden cardiac death. Understanding the link between T. cruzi infection and cardiomyopathy is essential for early diagnosis and adequate treatment.
Methods:
We sequenced small RNAs in serum samples from 228 Chagas patients recruited in Chile, Bolivia and Italy. After bioinformatic processing of sequencing data to quantify serum miRNA expression, robust logistic regression was applied to identify miRNAs differentially expressed in Chagas patients with abnormalities in electrocardiography (ECG), bundle-branch block on ECG, and high Kuschnir scores. We also investigated the association between genotype-based miRNA expression and the risk of abnormal ECG findings.
Findings:
As reported, the risk of abnormal ECG findings was higher in male patients and increased with age. Three miRNAs showed lower serum expression levels in patients with abnormal ECG: miRNA-101-3p, miRNA-576-3p and miRNA-629-5p (p < 0.0002), especially in patients with high Kuschnir scores. The expression of miRNA-629-5p was negatively correlated with the CCL5 expression (p = 3.7×10-8), a chemokine frequently reported in Chagas disease. Gene enrichment analyses indicated involvement of cytokine signalling in Chagas cardiomyopathy.
Interpretation:
The findings demonstrate the potential of circulating miRNAs as diagnostic biomarkers for Chagas cardiomyopathy. The associations found with disease severity and immune response may help to improve our knowledge of complications' development in Chagas disease.
