Declaration Dr. Thomas H. Pringle - Buffalo Field Campaign
Declaration Dr. Thomas H. Pringle - Buffalo Field Campaign
Declaration Dr. Thomas H. Pringle - Buffalo Field Campaign
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aligned with less than two out of three diagnostic sites, after a second PCR amplification.<br />
The remaining five samples consistently produced sequences with multiple overlapping<br />
nucleotide peaks, which precluded alignment with any haplotype. Multiple attempts<br />
involving repeated extraction, PCR amplification, and sequencing failed to resolve this<br />
issue for those samples.<br />
Ambiguous sequences that matched a haplotype at all three diagnostic sites, but<br />
had random nucleotide mis-incorporations at other sites, occurred in 4% of all samples.<br />
Haplotypes were not identified for these samples until repeated PCR and sequencing<br />
yielded a sequence that unambiguously aligned with a known haplotype without mis-<br />
incorporations at other sites within the sequence. The nucleotide errors were resolved for<br />
all of these samples on the second PCR. The per-nucleotide error rate was low for all of<br />
these samples, with the overall per-nucleotide error rate across all samples being 0.05%<br />
DISCUSSION<br />
We successfully extracted and amplified DNA from all eight matched fecal<br />
samples. However, because two samples had exceptionally high error rates, we<br />
recommend that future studies screen samples and exclude those that yield low<br />
amplification and high error rates. Thus, it is important to collect many extra fecal<br />
samples in the field to insure that there are sufficient high quality samples available for<br />
genetic study of interest. For bison, it may be necessary to collect at least 25% more fecal<br />
samples than what is needed to insure an adequate number are available for genetic<br />
analyses.<br />
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