The Tet-On 3G Tetracycline-Inducible Gene Expression Systems are the 3rd generation of the most powerful, versatile, and widely cited inducible mammalian expression systems available. The Tet-On 3G system offers a significant improvement over Tet-On and Tet-On Advanced with significantly reduced basal expression and increased sensitivity to doxycycline, a tetracycline analogue.
For more details, download our Tet-On 3G technical note.
Lowest Background Ever
Mutations within the PTRE3G promoter have reduced background expression from this tetracycline inducible promoter by 5–20-fold compared to our previous tightest promoter, PTight.
Mutations to create the Tet-On 3G transactivator have significantly increased its sensitivity to the inducer doxycycline (Dox).
Highest Fold Induction
Fold induction refers to the difference between the induced and uninduced states. Since Tet-On 3G retains the high maximal expression demonstrated by all Tet-On and Tet-Off systems but has significantly reduced basal expression compared to its predecessors, the fold induction levels are far higher.
Choice of Tet-On 3G Vector Formats
There are a range of available Tet-On 3G vector formats:
- The Tet-On 3G Inducible Expression System (EF1α Version), our EF-1 alpha promoter versions of the Tet-On 3G system, provide for consistent long-term expression of the Tet-On 3G transactivator, even in cell types known for their tendency to silence a CMV promoter over time, such as hematopoietic cells and stem cells.
- Bidirectional promoter versions of the system allow to induce expression of two genes from the same promoter, either two transgenes of your choosing or a single transgene and a fluorescent protein. If your cells turn red or green after adding Dox, this confirms thatyour gene has been turned on and that you have selected ahigh-performing inducible clone.
- Using IRES technology, we’ve married very tight gene expression control to a bright red fluorescent protein (mCherry) in the Tet-On 3G Inducible Expression System (with mCherry) and a bright green fluorescent protein (ZsGreen1) in the Tet-On 3G Inducible Expression System (with ZsGreen1).
- Retroviral and lentiviral formats include the PTRE3GV promoter, which is optimized for use in retroviral and lentiviral vectors. They are supplied with complete viral packaging systems.
Use Tetracycline-Approved Serum for Optimal Results
With the greatly increased sensitivity of the Tet-On 3G System, it is more important than ever that the serum you use for your studies is guaranteed to be tetracycline-free. Only Clontech performs actual inducibility tests on a sensitive Tet inducible cell line in order to provide an absolute guarantee that your serum will not affect basal expression in your Tet-On 3G experiments. Each Tet-On 3G System is supplied with 50 ml of our premium Tet-Approved FBS.