Difference between revisions of "Part:BBa K1825006"

Revision as of 15:59, 14 September 2015

35s CaMV + nptII

This is the neomycin phosphotransferase gene driven by the 35s cauliflower mosaic virus promoter. This promoter and gene was a part of a larger construct used for transforming Physcomitrella patens. We transformed this gene into Physcomitrella patens as a part of a larger DNA construct (fig. 1). This DNA construct contained in the following order. A homologous region to the 108 locus on the moss genome (to ensure stable integration into P. patens genome), the nptII-resistance gene driven by the 35s cauliflower mosaic virus, the Zea mays ubiquitin promoter driving the antifreeze protein (AFP) linked to yellow fluorescent protein (YFP) with the LP4 linker sequence, terminator and lastly another 108 region.

Figure 1) Gene construct with a gene encoding for an antifreeze protein. The nptII-gene is expressed with the 35s Cauliflower Mosaic virus promoter

Our moss was able to grow from single transformed protoplasts to full clumps on media containing kanamycin, which suggests that the nptII-resistance cassette provides P.Patens with resistance to kanamycin.

To further validate this, we outlined an additional experiment where we grew wild type (WT) moss on either nonselective PhyB-media (3 plates) or PhyB-media containing kanamycin 50 mg/ml (3 plates). After 7 days, there was a visible difference in growth between WT on nonselective media and WT on kanamycin plates (fig. 3). The WT moss planted on kanamycin containing plates grew very little or not at all and is seen under the microscope as withering (fig. 3 B2). This is a stark contrast to our transformed moss that was able to grow from protoplasts to full clumps. This experiment validates the function of the nptII-cassette consisting of the neomycin phosphotransferase II gene driven by the 35s Cauliflower Mosaic virus promoter.

Figure 3) Wild type P.patens grown on PhyB-edia with or without kanamycin (50 mg/ml). A) Wild type moss on media without kanamycin. B) Wild type moss grown on kanamycin containing plates (50 mg/ml). C) Wild type moss without kanamycin on top and with kanamycin on bottem. Photo taken 8 days after the moss was planted.

Sequence and Features