PubMed · 12491906
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Salvatore A E Marras, Fred Russell Kramer, Sanjay Tyagi. 2003. Genotyping SNPs with molecular beacons.. https://doi.org/10.1385/1-59259-327-5%3A111
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DNA labelling fluorescent dyes such as ethidium bromide have long been considered to be highly mutagenic during DNA replication. While recent studies have pushed back on this narrative, the intercalative nature of these dyes continues to raise the possibility that these dyes can induce mutations. The iconPCR instrument by n6tec uses fluorescent dyes to measure amplification in real time and to adjust cycling conditions. However, since this use of qPCR is preparative and not analytical, mutations introduced by fluorescent dyes would be propagated into the sequencing reaction. To address the impact of these dyes on downstream analyses, we have performed routine mutation calling as well as mutational signature analysis on samples amplified using the iconPCR in the presence of either SYBR or EvaGreen. Sequence analysis revealed very minimal impacts of dyes on the reactions, largely within the noise regimen with only subtle changes in mutation rates seen. Mutational signature analysis was unable to identify any key signatures assignable to the dyes in either substitutions or indel domains. The mutational impact of intercalating dyes during fluorescence-guided amplification is therefore minimal and can be disregarded in all but the most sensitive NGS applications.
We describe a strategy for the preparation and self-assembly of fluorescent nanosensors onto Saccharomyces cerevisiae cell surfaces for dynamically measuring oxygen concentration in the proximity of living cells. Amine functionalized polystyrene nanobeads were impregnated with an oxygen-sensitive ruthenium(II) complex and the beads' surface was coated with polyethylenimine. The resulting nanosensors were assembled on individual S. cerevisiae cells in a controlled manner at physiological pH for continuously monitoring oxygen consumption. This approach exemplifies a general scheme for assembling fluorescent nanosensors on cells for the non-invasive, reversible, and real-time measurement of other physiologically relevant processes, such as the efflux of protons and carbon dioxide, or the influx of glucose.
Nitric oxide, a reactive free radical, regulates a variety of biological processes. The absence of tools to detect NO directly, rapidly, specifically, and selectively motivated us to synthesize metal-based fluorescent probes to visualize the presence of NO. We prepared and investigated Co(II), Fe(II), Ru(II), Rh(II), and Cu(II) complexes as turn-on fluorescent NO sensors. Our exploration has provided insight into how the interaction of transition-metal centers with nitric oxide can be utilized for NO sensing.