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• W2140646670 abstract "The quantitative determination of specific cellular messenger-RNA is extremely important both in basic and applied research, especially in diagnostic and pharmacological fields. In order to perform a direct and easy quantification of transcripts on cell extracts, the feasibility of an analytical device able to selectively detect a defined target RNA in a complex mixture while avoiding labelling, retrotranscription and amplification steps, has been explored. In particular, several aspects necessary to obtain good selectivity in target recognition, stability, reusability and sensitivity of a gene specific biosensor were considered. For the development of suitable probe-receptors, analysis of the nucleotide sequence of the target mRNA was carried out to localise the preferred binding regions. As criteria for optimisation, we selected accessibility and uniqueness. Oligonucleotide probes, designed to specifically bind these sequences, were synthesised by using particular monomers producing nuclease-resistant RNA strands with high affinity towards the target. Quartz crystal microbalance (QCM) technology was selected to realise a microgravimetric sensor able to bind the RNA under investigation through a complementary oligonucleotide probe. Covalent immobilisation of bioreceptor molecules to the transducer sensitive surface ensured a stable integration between the two. The binding ability of immobilised probes was tested evaluating their annealing behaviour with both complementary oligonucleotides and full-length target mRNA. The conditions necessary for the regeneration of biosensor were also assessed. Measurements of shift in QCM resonant frequency, performed by hybridisation experiments in liquido, demonstrate that a label-free RNA-biosensor with high specificity, reusability and the ability to give quantitative information, can be realised." @default.
• W2140646670 created "2016-06-24" @default.
• W2140646670 creator A5051287193 @default.
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• W2140646670 date "2005-05-15" @default.
• W2140646670 modified "2023-09-24" @default.
• W2140646670 title "An integrated approach for the design and synthesis of oligonucleotide probes and their interfacing to a QCM-based RNA biosensor" @default.
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• W2140646670 doi "https://doi.org/10.1016/j.bios.2004.12.013" @default.
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