Would exonic primers affect gDNA amplification?

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SUMMARY

Exonic primers may not effectively amplify genomic DNA (gDNA) due to the presence of multiple annealing sites within the gDNA sequence. In contrast, cDNA amplification using the same exonic primer is successful, indicating that the primer's design is suitable for cDNA but not for gDNA. Nested PCR is recommended as a potential solution to enhance amplification success by utilizing upstream and downstream genetic information.

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Wek
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Will a primer designed for an exonic sequence anneal and sucessfully amplify a gDNA strand? I'm having trouble amplifying gDNA using that primer. cDNA with that primer amplifies perfectly. I have no problem amplifying gDNA using another primer that anneals to intronic sequences.
 
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I can't think of a reason why any given primer should work only for cDNA. Maybe the reason why you're having trouble with the genomic DNA amplification has to do with other possible annealing sites on the genomic DNA? I had this problem before. If you have upstream/downstream genetic information, maybe you should try a nested PCR?
 

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