Odd problem with RAPD

[yasunari takami]

> Robert Rumpf wrote:
> 
> > I'm posting this for a friend...he's successfully amplified a RAPD band
> > and cloned it, then sequenced it using vector primers.  He went ahead and
> > designed primers for the RAPD based on the sequences he obtained and now
> > can't amplify using these specific primers!  Anyone have a problem similar
> > to this or perhaps have an explanation for it?
> 
> I assume your friend used the clone as a positive control template and
> recovered the expected size band.  Suggest to him to dilute the clone into
> something like salmon sperm DNA to simulate the amount and complexity of
> unique DNA in the target genome and see if that works.  This will distinguish
> between a technical flaw in the amp. vs. the target seq. just not being there.
> 
> Hope this helps.
> Steve Hardies, Dept. of Biochemistry, Univ. of Texas HSC at San Antonio
> Hardies at thorin.uthscsa.edu
>