Removing DNA Contamination from RNA Samples by Treatment with RNase-Free DNase I

RNA samples prepared using monophasic lysis reagents may contain small amounts of contaminating genomic DNA, which must be removed if the RNA will be used in subsequent analyses such as reverse transcriptase-polymerase chain reaction (RT-PCR) or quantitative real-time RT-PCR. In addition, the presence of contaminating DNA can render the quantitative determination of RNA in a sample inaccurate. The most common and effective method for removing trace to moderate amounts of DNA contamination from RNA samples is digestion with DNase I, as described here.