Impermeable Dna Dye
Impermeable Dna Dye - Related Videos
07:44
Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
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Cited by 5 •
2016
Photostable cyanine dyes are attached to oligonucleotides to monitor hybridization by energy transfer.
04:18
DNA Electrophoresis Using Thiazole Orange Instead of Ethidium Bromide or Alternative Dyes
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Cited by 5 •
2019
Here, we present a protocol to use thiazole orange for the detection of DNA in gel electrophoresis experiments. The use of thiazole orange allows elimination of ethidium bromide, and fluorescence detection can be achieved with either UV or blue light.
06:58
Determining if DNA Stained with a Cyanine Dye Can Be Digested with Restriction Enzymes
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Cited by 5 •
2018
Staining DNA molecules for fluorescence microscopy allows a scientist to view them during an experiment. In the method presented here, DNA molecules are pre-stained with fluorescent dyes and digested with methylation and non-methylation sensitive restriction enzymes.
07:37
Circulating MicroRNA Quantification Using DNA-binding Dye Chemistry and Droplet Digital PCR
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Cited by 10 •
2016
A sensitive and accurate method for cell-free microRNAs quantification using a dye-based chemistry and droplet digital PCR technology is described.
08:36
FM Dyes in Vesicle Recycling
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2023
FM dyes are a class of fluorescent molecules that has found important use in studying the vesicle recycling process. By virtue of a chemical structure, these molecules can insert themselves into the outer leaflet of phospholipid bilayer membranes. After membrane insertion, they are internalized into the cell via endocytosed vesicles, and released when these vesicles recycle back to the membrane. Since, these dyes fluoresce strongly in the hydrophobic environment within membranes and weakly in...
FAQs
The key determinant is plasma-membrane integrity. Cells with intact membranes exclude the dye and contribute little or no nuclear fluorescence, whereas membrane disruption permits entry and access to DNA. Signal intensity therefore reflects the presence of membrane-compromised cells in the sample, allowing researchers to distinguish damaged or dead populations from viable cells.
DNA binding concentrates the fluorescent stain within the cell nucleus, creating a measurable signal rather than relying only on dye distribution throughout the sample. This localization helps microscopy and flow cytometry identify individual cells with disrupted membranes. The resulting fluorescence provides a practical readout for comparing the relative extent of cell damage across biological samples.
Samples can be interpreted by separating cells with detectable nuclear fluorescence from those lacking a signal. Fluorescent cells indicate membrane damage sufficient for dye entry, while nonfluorescent cells are consistent with intact membranes. Comparing these populations supports quantitative assessment of viability and helps reveal changes in cell injury between experimental conditions.
In a microscopy assay, the dye is applied to the biological sample and fluorescence is examined at the cellular level. Researchers identify nuclei that become fluorescent and determine where membrane-compromised cells occur. This approach can show the distribution of cell injury while also supporting comparisons among samples exposed to different infection or treatment conditions.
Flow cytometry measures fluorescence from individual cells as they pass through the instrument, enabling researchers to quantify fluorescent and nonfluorescent populations. With an impermeable DNA dye, this separates cells showing membrane disruption from those retaining membrane integrity. The resulting population measurements are useful for comparing infection severity, immune-mediated injury, or treatment responses.
The assay is particularly informative when researchers need to measure host-cell death or pathogen-associated cytotoxicity. In infection studies, fluorescence-based population comparisons can indicate differences in cellular injury between conditions. In immunology, the same readout supports evaluation of immune-mediated damage and helps assess whether treatments alter the extent of host-cell loss.