ArticleMethods in molecular biology (Clifton, N.J.)2025
Isolation and Analysis of Mitochondrial Small RNAs from Rat Liver Tissue and HepG2 Cells.
Article in Methods in molecular biology (Clifton, N.J.), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The presence of non-coding RNAs, such as microRNAs (miRNAs), in mitochondria has been reported by several studies. The biological roles and functions of these mitochondrial miRNAs ("mitomiRs") have not been sufficiently characterized, but the mitochondrial localization of miRNAs has recently gained significance due to modified mitomiR-populations in certain states of diseases. Here, we describe the isolation and analysis of mitochondrial RNAs from rat liver tissue and HepG2 cells. The principle of the analysis is to prepare mitochondria by differential centrifugation. Cytosolic RNA contamination is eliminated by RNase A treatment followed by percoll gradient-purification and RNA-extraction. Small RNA content is verified by capillary electrophoresis. Mitochondrial miRNAs are detected by Q-PCR following synthesis of cDNA. After Q-PCR based mitomiR-profiling, the Normfinder algorithm is applied to identify suitable reference miRNAs to use as normalizers for mitochondrial input and data analysis. The described procedure depicts a simple way of isolating and quantifying mitomiRs in tissue and cell culture samples.
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