I want to sequence pro-viral DNA from precious small sample (about 9 kb), The copy number of this pro-virus is very tiny. I am going to amplify several PCR products that cover all pro-virus and then directly sequence them without cloning.

I tried with Takara ExTaq and LATaq (Hot start versions) to amplify products between 3-6 kb each, but I get either extra nonspecific bands or wrong size bands. These enzymes are working great in our lab for the same purpose, but I think the main problem in my case that the copy number of pro-virus is tiny. I tried different primers, different conditions with no success just wasting my sample! I choose larger fragments to make maximum usage of my sample with minimum PCR reactions.So Any one has any suggestion regarding approach for this experiment? or suggestion for alternative polymerase enzymes with minimum optimization?

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