Tips From the Bench: High Throughput miRNA Isolation
- Purify high yields of quality RNA including miRNAs from frozen tissues, tissues stored in RNAlater® Solution, and cells
- Recover RNA samples in 20–50 µL
- Suitable for real-time RT-PCR or array analysis
How to Recover Total RNA Containing Small RNAs
Figure 1. Obtain High Quality RNA Using the MagMAX™-96 for Microarrays Total RNA Isolation Kit. Electropherograms were generated with the Agilent® 2100 bioanalyzer. The strong peak at 85 nucleotides likely represents small RNAs such 5S rRNA and tRNA. The peaks at 1800 nucleotides and 3600 nucleotides represent 18S rRNA and 28S rRNA, respectively. The A260/A280 absorbance data was obtained using a NanoDrop® spectrophotometer.
The presence of miRNAs was further verified using Applied Biosystems TaqMan® MicroRNA Assays (Figure 2). Recovery of miRNAs using the modified MagMAX for Microarrays protocol was compared to traditional mirVana™ miRNA isolation methods using assays for 3 mature miRNAs. As no significant differences were detected between these methodologies, we conclude that this protocol modification supports efficient miRNA isolation for high throughput experiments.
High yields of pure, intact total RNA containing miRNAs can be used in standard real-time RT-PCR assays (TaqMan® Gene Expression Assays) and real-time RT-PCR assays targeting mature microRNAs (TaqMan MicroRNA Assays). The RNA samples can also be used for analysis on mirVana miRNA Bioarrays.
Nathan Harris, Adam Toguchi • Applied Biosystems, Austin, TX
For Research Use Only. Not for use in diagnostic procedures.