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Using pseudoalignment and base quality to accurately quantify microbial community composition

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  • Mark Reppell
  • John Novembre

Abstract

Pooled DNA from multiple unknown organisms arises in a variety of contexts, for example microbial samples from ecological or human health research. Determining the composition of pooled samples can be difficult, especially at the scale of modern sequencing data and reference databases. Here we propose a novel method for taxonomic profiling in pooled DNA that combines the speed and low-memory requirements of k-mer based pseudoalignment with a likelihood framework that uses base quality information to better resolve multiply mapped reads. We apply the method to the problem of classifying 16S rRNA reads using a reference database of known organisms, a common challenge in microbiome research. Using simulations, we show the method is accurate across a variety of read lengths, with different length reference sequences, at different sample depths, and when samples contain reads originating from organisms absent from the reference. We also assess performance in real 16S data, where we reanalyze previous genetic association data to show our method discovers a larger number of quantitative trait associations than other widely used methods. We implement our method in the software Karp, for k-mer based analysis of read pools, to provide a novel combination of speed and accuracy that is uniquely suited for enhancing discoveries in microbial studies.Author summary: Pooled DNA from multiple unknown organisms arises in a variety of contexts. Determining the composition of pooled samples can be difficult, especially at the scale of modern data. Here we propose the novel method Karp, designed to perform taxonomic profiling in pooled DNA. Karp combines the speed and low-memory requirements of k-mer based pseudoalignment with a likelihood framework that uses base quality information to better resolve multiply mapped reads. We apply Karp to the problem of classifying 16S rRNA reads using a reference database of known organisms. Using simulations, we show Karp is accurate across a variety of read lengths, reference sequence lengths, sample depths, and when samples contain reads originating from organisms absent from the reference. We also assess performance in real 16S data, where we reanalyze previous genetic association data to show that relative to other widely used quantification methods Karp reveals a larger number of microbiome quantitative trait association signals. Modern sequencing technology gives us unprecedented access to microbial communities, but uncovering significant findings requires correctly interpreting pooled microbial DNA. Karp provides a novel combination of speed and accuracy that makes it uniquely suited for enhancing discoveries in microbial studies.

Suggested Citation

  • Mark Reppell & John Novembre, 2018. "Using pseudoalignment and base quality to accurately quantify microbial community composition," PLOS Computational Biology, Public Library of Science, vol. 14(4), pages 1-23, April.
  • Handle: RePEc:plo:pcbi00:1006096
    DOI: 10.1371/journal.pcbi.1006096
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    2. Oren E Livne & Lide Han & Gorka Alkorta-Aranburu & William Wentworth-Sheilds & Mark Abney & Carole Ober & Dan L Nicolae, 2015. "PRIMAL: Fast and Accurate Pedigree-based Imputation from Sequence Data in a Founder Population," PLOS Computational Biology, Public Library of Science, vol. 11(3), pages 1-14, March.
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