Part:BBa_K2100008:Experience

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Applications of BBa_K2100008

We used our promoter to build the pPRE3:eYFP construct to characterize the functionality of our promoter.

We characterized the synthetic PRE3 promoter in two cell lines: MCF7 and tHESC. All cell lines have endogeneous progesterone receptor A. We analyzed data from cells induced with 1 uM of MPA compared to those uninduced with hormones. This concentration of MPA was recommended to us as an appropriate "on" or saturating concentration by the Griffith Lab which provided us with these cells.

Experiment in tHESC:

We transfected tHESC cells with 250ng of hEF1a:mKate as a transfection marker and 250 ng pPRE3:eYFP to examine the promoter's transcriptional activity by observing increases in yellow fluorescence upon cells being induced with 1 uM MPA. This ratio was chosen to be 1:1 based on the small amount of plasmids being transfected. We were looking to deterimne the on-off functionality of our promoter pPRE3 in the tHESC cell line.

The panel above represents results for pPRE3:eYFP transfected into the tHESC cell line, comparing the uninduced population to a population induced with 1 uM MPA. The y-axis represents the measured yellow fluorescence intensity from the eYFP on our reporter plasmid, whereas the x-axis represents the measured red fluorescence intensity from the mKate on our constitutively active transfection marker.

The results showed little to no increase in fold difference of yellow fluorescence when comparing induced vs. uninduced cells. Unfortunately, we could not prove with this experiment that the PRE3 promoter increases activity in response to progesterone induction.

Experiment in MCF7:

We additionally transfected MCF7 cells with 250ng of hEF1a:mKate as a transfection marker and 250 ng pPRE3:eYFP (the same 1:1 ratio as the experiments ran in tHESC) to examine the promoter's transcriptional activity increase when induced with estrogen. However, the transfection efficiency was not high enough to determine conclusive results about the functionality of pPRE3:eYFP in ISH cells.

Overall, our promoter pPRE3 cascade with eYFP demonstrates no fold difference when induced with progesterone in multiple cell lines.

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