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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 />

22

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