Dual Marker Selection
Dual Marker Selection - Related Videos
08:45
Duplex Digital PCR for Simultaneous Quantification of Dual Genetic Markers
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2025
In this video, we demonstrate the duplex digital PCR (ddPCR) technique — a modification of the traditional PCR technique that is useful in detecting two different genetic markers simultaneously. A single PCR reaction is partitioned into nanoliter-sized emulsified droplets that are independently amplified, and the detection of differently colored fluorescence amplification signals from the fraction of droplets is used to compute the initial concentration of the target sequences.
06:05
Development of a Negative Selectable Marker for Entamoeba histolytica
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Cited by 3 •
2010
We report development of a negative selection system in E. histolytica based upon transgenic expression of a chimeric protein (FCU1) and selection with the prodrug 5-fluorocytosine. The FCU1 protein is a fusion of yeast cytosine deaminase and uracil phosphoribosyltransferase. Expression of FCU1 resulted in increased E. histolytica sensitivity towards 5-fluorocytosine.
12:03
The Production of C. elegans Transgenes via Recombineering with the galK Selectable Marker
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Cited by 4 •
2011
The ability to produce transgenes for Caenorhabditis elegans using genomic DNA carried by fosmids is particularly attractive as all of the native regulatory elements are retained. Described is a simple and robust procedure for the production of transgenes via recombineering with the galK selectable marker.
02:30
F Plasmid Transfer and Dual Antibiotic Selection in E. coli
0 Views •
2025
Source: Erdogan, F.,et al., Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation. J. Vis. Exp. (2017)This video demonstrates the procedure for transferring an F plasmid from donor to recipient E. coli cells using a rescue plasmid and selecting transconjugants through dual antibiotic resistance. The process includes mixing bacterial cultures, incubation without shaking, disrupting mating pairs, and plating on selective media to confirm...
07:33
In vivo Dual Substrate Bioluminescent Imaging
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Cited by 20 •
2011
Herein we describe the methods to construct, visualize, and quantify the bioluminescent reactions of both firefly and renilla luciferase enzymes expressed in metastatic breast cancer cells during their growth and metastasis in vivo.
FAQs
Dual Marker Selection may apply both selection conditions at the same time or introduce them in sequence. Simultaneous selection enriches cells that tolerate or display both marker-associated traits under combined conditions, whereas sequential selection applies one condition before the other. The choice affects how researchers identify populations carrying both genetic features and can be adapted to the experimental design.
Selectable markers allow researchers to enrich cells according to their response to specific selection agents, while detectable markers produce distinguishable signals that reveal marker expression. Using either type, or combining their functions, helps separate cells with the intended genetic features from those lacking them. The appropriate format depends on whether enrichment, visual identification, or both are required.
A single marker can show that a cell carries one desired genetic element, but it cannot reliably establish that a second element is present. Requiring evidence of both markers provides a way to distinguish co-transformed cells from cells containing only one construct. This improves identification of populations in which multiple genetic features were introduced together.
Cells expressing or satisfying both marker conditions are consistent with retention of both targeted genetic features, while cells showing only one marker may carry only part of the intended modification. Comparing these patterns helps researchers characterize the selected population rather than treating every surviving or detectable cell as equivalent. The result is more informative assessment of transformation success.
Researchers first introduce genetic elements associated with two distinct markers into the target cells, tissue, or organism. They then apply the relevant selection conditions sequentially or simultaneously, depending on the experimental design. The resulting population is examined for both marker traits, allowing enrichment or identification of cells that retain the desired combination of genetic features.
The approach is particularly useful when an experiment requires cells to carry multiple constructs or genetic elements rather than a single modification. By selecting or detecting two independent traits, researchers can enrich for co-transformed populations and improve confidence that the desired combination was retained. This makes the method relevant to genetic engineering and studies of genetically modified cells.
In transfection studies, two markers help distinguish cells that received both intended genetic elements from those receiving only one. During stable cell-line development, the same logic supports enrichment of populations that retain the required combination of features. The resulting identification step can make it easier to focus subsequent analysis on cells with the intended genetic profile.
Stem cell experiments may require identification of cells carrying more than one introduced genetic feature, making dual-marker enrichment useful for focusing analysis on the intended population. Researchers can apply the markers during studies involving genetic modification or cell-line development, then evaluate cells that show both traits. This supports more precise tracking of engineered stem-cell populations.