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Still got them mutagenesis blues!

Malcolm White mfwhite at bad.dundee.ac.uk
Tue Dec 12 12:36:03 EST 1995

In article <msz-1212951147230001 at image.bmc.uu.se>, msz at bio.embnet.se
(Michael Szardenings) wrote:

> In article <Yasha-1112951213170001 at mac2wild2.tamu.edu>,
> Yasha at bioch.tamu.edu (Yasha Hartberg) wrote:
> > I've posted this problem before but have a bit of new information to add
> > to the problem.  I am using Kunkel selection site-directed mutagenesis
> > from an M13 derived template.  We have used this method for years in the
> > lab with success.  However, during the past year, I have not been able to
> > get plaques after transfecting with the extension reaction.  Controls show
> > that my cells are competent and contain the F-factor.  Direct
> > incorporation of P32-dATP in the extension shows that I am getting
> > extension.  However, I always see two bands of equal intensity in the
> > autoradiogram of the extension reaction.
> > 
> > My first thought was that the two bands were the result of partial
> > linearization of the ssDNA template.  Several template preps show the same
> > pattern, however, so I'm not sure.  

We use Kunkel mutagenesis routinely, and the only problem we ever had was
using Promega T4 polymerase, which was contaminated with a uracil
glycosylase. I don't know if they've solved that problem, but you could
try changing your polymerase source.

Good luck...


Malcolm White
University of Dundee

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