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Author(s): Heiner, C. and Oh, S. and Hall, R. and Staley, C. and Hamilton, M. and Khoruts, A. and Kelly, C. and Brandt, L. and Sadowsky, M.

Fecal samples were obtained from human subjects in the first blinded, placebo-controlled trial to evaluate the efficacy and safety of fecal microbiota transplant (FMT) for treatment of recurrent C. difficile infection. Samples included pre-and post-FMT transplant, post-placebo transplant, and the donor control; samples were taken at 2 and 8 week post-FMT. Sequencing was done on the PacBio Sequel System, with the goal of obtaining high quality sequences covering whole genes or gene clusters, which will be used to better understand the relationship between the composition and functional capabilities of intestinal microbiomes and patient health. Methods: Samples were randomly sheared to 2-3 kb fragments, a sufficient length to cover most genes, and SMRTbell libraries were prepared using standard protocols. Libraries were run on the Sequel System, which has a throughput of hundreds of thousands of reads per SMRT Cell, adequate yield to sample the complex microbiomes of post-transplant and donor samples.Results: Here we characterize samples, describe library prep methods and detail Sequel System operation, including run conditions. Descriptive statistics of data output (primary analysis) are presented, along with SMRT Analysis reports on circular consensus sequence (CCS) reads generated using an updated algorithm (CCS2). Final sequencing yields are filtered at various levels of predicted accuracy from 90% to 99.9%. Previous studies done using the PacBio RS II System demonstrated the ability to profile at the species level, and in some cases the strain level, and provided functional insight. Conclusions: These results demonstrate that the Sequel System is well-suited for characterization of complex microbial communities, with the ability for high-throughput generation of extremely accurate single-molecule sequences, each several kilobases in length. The entire process from shearing and library prep through sequencing and CCS analysis can be completed in less than 48 hours.

Organization: PacBio
Year: 2016

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