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Evaluation of Commercially Available Kits for Parallel DNA and microRNA Isolation Suitable for Epigenetic Analyses from Cell-Free Saliva and Salivary Extracellular Vesicles
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Evaluation of Commercially Available Kits for Parallel DNA and microRNA Isolation Suitable for Epigenetic Analyses from Cell-Free Saliva and Salivary Extracellular Vesicles
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Evaluation of Commercially Available Kits for Parallel DNA and microRNA Isolation Suitable for Epigenetic Analyses from Cell-Free Saliva and Salivary Extracellular Vesicles
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Journal Article
Evaluation of Commercially Available Kits for Parallel DNA and microRNA Isolation Suitable for Epigenetic Analyses from Cell-Free Saliva and Salivary Extracellular Vesicles
2025
Overview
Circulating cell-free nucleic acids (NAs), in particular plasma-derived cell-free DNA, have evolved into promising clinical analytes for prenatal diagnostics, cancer analysis, and cancer surveillance and therapy monitoring. Nevertheless, salivary extracellular and extracellular vesicle (EV)-derived DNA and microRNA have recently gained attention as potential non-invasive biomarkers for a variety of diseases, including cancer, cardiovascular, autoimmune, and infectious diseases. Our goal in this study was therefore to evaluate and optimize commercially available approaches for cell-free nucleic acid isolation, focusing specifically on DNA and miRNA present in cell-free saliva or saliva-derived EVs. Along these lines, we investigated various commercially available kits, which enable parallel isolation of cell-free DNA and RNA in separate fractions from cell-free saliva and salivary EVs, respectively, and compared them to single analyte extraction kits. The efficiency of all tested nucleic acid extraction methods was determined by comparing DNA and RNA fluorescence spectroscopy measurements and quantitative PCR values obtained from a selection of different DNA- and microRNA targets. We found the Norgen Plasma/Serum RNA/DNA Purification Mini kit in combination with the miRCURY exosome isolation kit to work best in our hands and to provide the highest yields of EV-derived nucleic acids. Having tested and identified effective protocols for isolating salivary extracellular nucleic acids, we present with this comparison study, among others, a sound basis for future circulating small nucleic acid and epigenetic biomarker research aiming for early disease diagnosis, prognosis, and prediction from cell-free saliva, representing an easy-to-collect and readily available diagnostic fluid.
Publisher
MDPI AG
