Data Type


Category

+ Show All

Research Area

+ Show All
694 results sorted by

Following Nucleofection, I cannot obtain stable clones from single cells, what could be the reason?

Some cell lines need certain cell densities to proliferate. For those cells you can try using conditioned medium for setting up limiting dilution or culturing single cells together with feeder cells.

Do you have data about the in vivo implantation of hepatocytes transfected by Nucleofection? For how long could protein expression be detected?

There is a publication reporting on the successful reinjection of modified hepatocytes into mice.Chen et al. were able to monitor the expression over several days. This group worked with a preliminary test solution for mouse hepatocyte as the...


Are rat and mouse hepatocytes transfected by Nucleofection still functional?

Yes, transfected mouse hepatocytes show albumin synthesis rates comparable to those of untransfected cells. Moreover the morphology and polarization of rat hepatocytes is not affected by Nucleofection™.

How much DNA should I use in my Nucleofection Reaction to obtain stable clones?

You should use the amount of DNA recommended in the optimized protocol for transient transfection. If obtaining a very high number of clones is important for your experiments, you can try increasing the amount of DNA. For further tips see our...

Generation of a stable cell line: A positive control plasmid works, but I cannot obtain stable clones with my construct of interest. What could be the reason?

One reason could be that your gene product is toxic to the cells. We recommend testing the construct for expression of the gene of interest by transient Nucleofection™ of your cells. If the proportion of expressing cells drops between 4 and 48 hours...

Is there a reason why in our Nucleofector Protocols for Primary Human Chondrocytes we include FCS in the pronase and collagenase solutions for preparation of chondrocytes?

Yes, even though this may sound odd since serum is generally known to inactivte proteases. We recommend it in this case, however, because the incubation times are quite long and the cells are stressed by the procedure. The amounts of enzymes should...

How long does it take to obtain stable transfectants?

Depending on individual cell type and doubling rate, selection of stable transfectants will take between 7 and 28 days. Expansion and characterization of single cell clones will take several weeks in addition.

Does the GFP sequence in your pmaxGFP control plasmid have a stop codon?

Yes. The coding sequence ends with a stop codon (TGA/UGA).

I have a very high transfection efficiency but most of my cells die during selection, is this to be expected?

This is the normal pattern you should expect to see. Only a small proportion (1/10,000 to 1/100) of all transfected cells will integrate the transfected DNA into their genome and become stable transfectants. The remaining cells lose the transfected...
PAGE 5