Abstract
The protocol reported in this chapter describes a method for the detection and spatial localisation of microRNAs (miRNAs) in cryopreserved primary leukaemic suspension cells using digoxigenin (DIG)-labelled, Locked Nucleic Acid (LNA)-modified probes, and fluorescence in situ hybridisation (FISH). The LNA probe hybridisation yields highly accurate signals able to discrimin.ate between single nucleotide differences and hence between closely related miRNA family members. DIG-labelled LNA probes for mature miRNAs are detected using an anti-DIG fluorescein isothiocyanate (FITC) conjugated antibody and the fluorescent signals visualised with a confocal microscope, which permits the spatial localisation of the miRNAs.
Using LNA-FISH, we visualised the spatial localisation of two mature miRNAs, miR-127 and miR-154, in primary acute myeloid leukaemia (AML) suspension cells, and thus, we confirmed their expression in a specific leukaemic subtype as measured by real-time PCR.
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Acknowledgments
This work was supported by funds from Barts & The London, Research Advisory Board Studentship (ONA100P).
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Debernardi, S., Dixon-McIver, A. (2010). MicroRNA Detection in Bone Marrow Cells by LNA-FISH. In: Monticelli, S. (eds) MicroRNAs and the Immune System. Methods in Molecular Biology, vol 667. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-811-9_3
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DOI: https://doi.org/10.1007/978-1-60761-811-9_3
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