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Microarray-based, high-throughput gene expression profiling of microRNAs
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DOI：10.1038/NMETH717.png)
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MicroRNAs (miRNAs) are small regulatory RNAs that serve fundamental biological roles across eukaryotic species. We describe a new method for high-throughput miRNA detection. The technique is termed the RNA-primed, array-based Klenow enzyme (RAKE) assay, because it involves on-slide application of the Klenow fragment of DNA polymerase I to extend unmodified miRNAs hybridized to immobilized DNA probes. We used RAKE to study human cell lines and brain tumors. We show that the RAKE assay is sensitive and specific for miRNAs and is ideally suited for rapid expression profiting of all known miRNAs. RAKE offers unique advantages for specificity over northern blots or other microarray-based expression profiting platforms. Furthermore, we demonstrate that miRNAs can be isolated and profiled from formalin-fixed paraffin-embedded tissue, which opens up new opportunities for analyses of small RNAs from archival human tissue. The RAKE assay is theoretically versatile and may be used for other applications, such as viral gene profiting.
Keyword:
OLIGONUCLEOTIDE MICROCHIP
BIT ANALYSIS
RNA
BRAIN
IDENTIFICATION
HYBRIDIZATION
OPTIMIZATION
BIOGENESIS
KINETICS
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