PRINCETON IGEM 2008
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Mouse embryonic stem cells (round and unspeciallized at day 0) that have been infected with the Lentiviral plasmid pLV-TRE-Ngn1-EYFP-2A-mKate-Ubc-Bla imaged 7 days after exposure to Doxycyclin. The yellow that is observed in the nucleus of the cells indicates the expression of the fluorescent protein EYFP and its attached transcription factor Ngn1, a cell fate regulator that drives the differentiation of stem cells into neurons. The lack of yellow in some of the cells indicates that Ngn1 is no longer being transcribed. The red observed in the cell body and its extensions indicates the expression of cytosolic fluorescent protein mKate as well as its attached Ubc promoter and blastomycin selection. Together these fluorescent proteins show that the plasmid has been incorporated into the host's genetic material and is being expressed. Furthermore, the circular cell bodies with long thin extensions leading to other cell bodies, and the web-like appearance of these extensions are both part of the phenotype expected from a neural precursor as well as mature neurons. (This is really cool.)
Mouse embryonic stem cells (round and unspecialized at day 0) that have been infected with the Lentiviral plasmid pLV-TRE-Ngn1-EYFP-2A-mKate-Ubc-Bla imaged approximately 6 days after exposure to Doxycyclin and stained with anti-B-tubulinIII. The red observed in these cells indicate the presence of B-tubulinIII, which is a protein specific to neural progenitor cells, indicating that the stem cells have successfully been differentiated into neural precursors.
The following plasmids have been fully constructed, sequenced, packed into lentivirus, and used to infect mouse embryonic stem cells. (See Part registry for individual functions)
* pLV-TRE-Mash1-IRES2-mKate * pLV-TRE-Ngn1-linker-EYFP-Ubc-Bla * pLV-TRE-Ngn1-linker-EYFP-2A-mKate-Ubc-Bla * pLV-TRE-Sox17-Ubc-Bla * pLV-TRE-D5R-Ubc-Bleo * pLV-TRE-Lbx1-T2A-GLRA1-P2A-D5R-Ubc-Bla
These cultures are currently being grown and video imaged for their fluorescent markers, which will indicate the successful incorporation of the plasmids into the cell's genetic material as well as the extent to which the cells differentiate into neurons with these cell fate regulators. The last plasmid list is of particular importance to our system because it codes for the receptors expressed in one of our system's population as well as the genes that regulate the cells ability to produce GABA. This is one of the populations that we expect to act as an inhibitor population in our Toggle. We plan to determine if this neuron population can grow on the gold plating that will be used for circuit patterning. The circuit pattern of gold plating have also been successfully designed and constructed.