Abstract
Mitochondria have two sets of RNAs. One is encoded in mitochondrial genome, and the other that consists of imported RNAs within mitochondria and cytosolic RNAs associated with mitochondrial outer membrane is encoded in the nucleus. These mitochondrial RNAs play important roles in mitochondrion biosynthesis and signaling in and out of mitochondria. Isolation and analysis of mitochondrial RNAs can provide useful information on understanding the mitochondrial regulation of cellular processes. However, several ribonuclease activities have been found in mitochondria, which will degrade mitochondrial RNAs during the isolation process if they are not properly inactivated. Here, we describe an improved method to inactivate the ribonuclease activities prior to RNA extraction, and thus provide a reliable protocol to isolate mammalian mitochondrial RNAs for quantitative RT-PCR and other assays.
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