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| | ===Applications of BBa_K2520023=== | | ===Applications of BBa_K2520023=== |
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| − | ==Characterization==
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| − | While the majority of our project was focused on engineering leader cells, we were also interested in manipulating the follower cells by genetically engineering HL-60 cells. We noticed that while there were several methods of transfection described for HL-60 cells ( including a project by the <a href=”http://2009.igem.org/Team:UCSF”>2009 UCSF iGEM team</a>, a paper by <a href=”http://limlab.ucsf.edu/papers/pdfs/park_2014.pdf”>Park et. al.</a>), we did not find any systematic data on the function of commonly used promoters in this cell type. Considering that HL-60 cells are relatively difficult to transfect and require harsh transfection conditions (electroporation) that can result in cell death and low transfection efficiency, we wanted to find a promoter that would lead to reliable and strong expression of transfected genes in order to facilitate our future experiments with the SynNotch system and engineering of leader cells to become followers.
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| − | In particular, we characterized the expression of the fluorescent proteins EYFP and TagBFP encoded on plasmids under the CMV and hEF1a promoters and transfected by electroporation into undifferentiated HL-60 cells.
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| − | Figure 1:
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| − | https://parts.igem.org/File:T--MIT--PartsFigure1.png
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| − | Figure 2a:
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| − | https://parts.igem.org/File:T--MIT----PartsFigure2a.png
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| − | Figure 2b:
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| − | https://parts.igem.org/File:T--MIT----PartsFigure2b.png
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| − | We observed a lot of cell death due to electroporation. Events from the flow cytometry analysis were first plotted on an FSC/SSC dot-plot graph to set an analysis gate, as shown in Figure 1. For the cells within the analyzed gate we looked at fluorescence in the FITC channel (excitation 488 nm, detection window 530/30 nm) for detection of EYFP and Pacific Blue channel (excitation 405 nm, detection window 450/50 nm) for detection of TagBFP. We found that 52% of cells transfected with CMV-EYFP were fluorescent in the yellow channel, and 35% of cells transfected with CMV-TagBFP were fluorescent in the blue channel. On the other hand, only 1.5% of cells transfected with hEF1a-EYFP and 8% of cells transfected with hEF1A-TagBFP were weakly fluorescent.
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| − | Figure 2 shows the overlay of histograms for untransfected cells (control, shown in green) and cells transfected with the fluorescent protein encoded under a CMV promoter (shown in blue) or hEF1a promoter (shown in red) for a) TagBFP and b) EYFP.
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Latest revision as of 03:35, 22 October 2019
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