Thank you @jennaj for the suggestions. I was able to resolve the issue by the following:
-
Split my large file containing the ORFs of interest (~47 000 sequences) into separate files each containing 500 sequences each
-
Used one of the files produced from the above step to find putative primers and generate a bed file with the coordinates (Used Primer3).
-
Created a custom build on galaxy using the file (same one as selected for Step 2) that I used to find the primers. This same file was also used as the reference genome for the Extract Genomic DNA search.
-
Assigned the bed file and the reference genome to the custom build.
-
Success running Extract Genomic DNA.
I actually didn’t need to normalize the data following procedure, but that may have been happy coincidence.
Thanks again for the suggestions!
Andrea