Please help with stable transfection

[Ian A. York]

In article <c09b237b.0210091339.2867d9fa at posting.google.com>,
John Ladasky <ladasky at my-deja.com> wrote:
>> 
>> > unfortunately a common one.  Like you, I have had the percentage of
>> > fluorescence-positive cells decline as I continue to grow cells.
>> > Other researchers in the laboratories where I have worked have also
>> > had trouble.  It doesn't always happen, but when it does it is
>> > extremely frustrating.

For what it's worth, in at least one case this sort of problem was 
eventually overcome by repeatedly subcloning the original (unstable) 
population.  We eventually pulled out a clone that has proved stable over 
a reasonably long period.  Whether this clone has further mutations that, 
for example, reduces its ability to recombine or something like that, we 
don't know.  

Ian 
-- 
    Ian York   (iayork at panix.com)  <http://www.panix.com/~iayork/>
    "-but as he was a York, I am rather inclined to suppose him a
     very respectable Man." -Jane Austen, The History of England