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A many probes-one spot hybridization oligonucleotide microarray.
Analytical and Bioanalytical Chemistry 2018 September
A variant of the hybridization oligonucleotide microarray, utilizing the principle of many probes-one spot (MPOS-microarrays), is proposed. A case study based on Orthopoxviruses (Variola, Monkeypox, and Ectromelia viruses) demonstrates a considerable increase in the fluorescence signal (up to 100-fold) when several oligonucleotide probes are printed to one spot. Moreover, the specificity of detection also increases (almost 1000-fold), allowing the use of probes that individually lack such high specificity. The optimal probes have a Tm of 32-37 °C and length of 13-15 bases. We suggest that the high specificity and sensitivity of the MPOS-microarray is a result of cooperativity of DNA binding with all probes immobilized in the spot. This variant of DNA detection can be useful for designing biosensors, tools for point-of-care (POC) diagnostics, microbial ecology, analysis of clustered regularly interspaced short palindromic repeats (CRISPR), and others. Graphical abstract ᅟ.
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