PCR inhibition from worm DNA preparation

Craig Wilding Craig.Wilding at westlakes.ac.uk
Thu Jun 17 10:23:21 EST 2004

I have extracted genomic DNA from earthworms and compost worms but am 
struggling to PCR from this. It seems to contain a PCR inhibitor as 
adjudged by spiking PCRs that definitely work with this DNA. I have 
cleaned it up with a Promega wizard column which has not completely 
cured the problem. I don't know what the inhibitor is but have read that 
DNA extracted from soil can contain PCR inhibiting humic and fulvic 
acids. Since the worms had soil in their guts this may be the source of 
the problem. Has anyone any ideas for how to clean the DNA and 
completely get rid of the inhibitors?

Craig Wilding
Genetics Department
Westlakes Research Institute
International Research and Graduate Centre
Westlakes Science & Technology Park
Moor Row
CA24 3JY

Tel 	01946 514158
Fax 	01946 514166
e-mail 	craig.wilding at westlakes.ac.uk

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