Abstract
The ability to determine spatial and temporal microRNA (miRNA) accumulation at the tissue, cell and subcellular levels is essential for understanding the biological roles of miRNAs and miRNA-associated gene regulatory networks. This protocol describes a method for fast and effective detection of miRNAs in frozen tissue sections using fluorescence in situ hybridization (FISH). The method combines the unique miRNA recognition properties of locked nucleic acid (LNA)-modified oligonucleotide probes with FISH using the tyramide signal amplification (TSA) technology. Although both approaches have previously been shown to increase detection sensitivity in FISH, combining these techniques into one protocol significantly decreases the time needed for miRNA detection in cryosections, while simultaneously retaining high detection sensitivity. Starting with fixation of the tissue sections, this miRNA FISH protocol can be completed within approximately 6 h and allows miRNA detection in a wide variety of animal tissue cryosections as well as in human tumor biopsies at high cellular resolution.
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Acknowledgements
The authors wish to thank Anna Catharina Lassen, Ha Nguyen, Ursula Rentzmann, Lene Løgstrup and Eniser Zekirovska for their excellent technical assistance. This study was supported by grants from the Danish National Advanced Technology Foundation, Danish Medical Research Council to S.K., Danish Research Agency to A.N.S. and the Lundbeck Foundation to S.K. and A.N.S. Wilhelm Johannsen Centre for Functional Genome Research is established by the Danish National Research Foundation.
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Silahtaroglu, A., Nolting, D., Dyrskjøt, L. et al. Detection of microRNAs in frozen tissue sections by fluorescence in situ hybridization using locked nucleic acid probes and tyramide signal amplification. Nat Protoc 2, 2520–2528 (2007). https://doi.org/10.1038/nprot.2007.313
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DOI: https://doi.org/10.1038/nprot.2007.313
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