PCR variability with DNA extraction method

benedicte Shevchenko b-bertra at nimr.mrc.ac.uk
Wed Aug 7 04:56:39 EST 1996


I had the same problem of PCR band disappearance after extraction of DNA 
from blood using Quiagen extration kit. In fact latter I read that 
Hemoglobine which some time contaminates samples is an inhibitor of DNA 
polymerase. And it's necessary to heat PCR mixture-samples at 94 C for 
10 to 15 min prior addition of nucleotides and enzyme. When I did this, 
suddenly the bands appeared. So when you boiled your samples I suppose 
you distroy the hemoglobine and then your PCR reaction is good.
In fact recently I shift from quiagen and I use a kit from DYNAL : 
Dynabeads DNA direct kit. It's very easy to use and I never had problem 
of PCR inhibition after DNA preparation. I even never need to boild my 
samples anymore.
Hope this can help you.


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