Add time:09/06/2019         Source:sciencedirect.com

Recently, altered expression levels of microRNAs (miRNAs) – short noncoding RNA molecules which bind to mRNAs and thus regulate gene expression – were observed in many cancer cells. miRNA expression profiling is therefore of great interest, but current standard methods are still considered relatively laborious and expensive. Electrochemistry has a potential to become quick and inexpensive alternative. Here, we describe modification of miRNA with an electroactive complex composed of six-valent osmium and 2,2′-bipyridine, Os(VI)bipy, specifically binding to the 3′-end of the ribose, which is detectable at hanging mercury drop electrode at femtomole level due to an electrocatalytic nature of a resulting signal. By combining miRNA labeling step with magnetic beads-based hybridization assay, detection of specific miRNA sequence from a mixture of other noncomplementary miRNAs was possible.

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