Problem on transformation

Rich Dudley rdudley+ at
Fri Nov 20 15:45:28 EST 1998

Long-Cheng li wrote:

> Hi, Everybody:
> Recently I got a strange problem trying to clone a promoter sequence
> into pGL3 enhancer. After transformation, we could get positive  clone
> as tested by PCR of the minipreps. The problem was the positive clone
> became negative after maxiprep either tested by PCR or digestion. This
> phenomona repeated itself several times. If anybody has any suggestion,
> please give me a reply. Thanks.
> Long
> longli at

Check your PCR reagents.  Sounds like they may be contaminated.


--- --- --- -- -- -- --- --- ---
Richard J. Dudley (rdudley+ at
Research Specialist V
Dept. of Cell Biology and Physiology
University of Pittsburgh
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