PuzzleCluster: A Novel Unsupervised Clustering Algorithm for Binning DNA Fragments in Metagenomics

Kyler Siegel, Kristen Altenburger, Yu-Sing Hon, Jessey Lin, Chenglong Yu

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Metagenomic datasets are composed of DNA fragments from large numbers of different and potentially novel organisms. These datasets can contain up to several million sequences taken from heterogeneous populations of extremely varied abundance. Unlike traditional genomic studies, metagenomic analysis requires an additional binning step. This process groups DNA fragments from the same or similar species of origin. However, existing unsupervised metagenomic binning programs cannot accurately analyze datasets containing a large number of species or with significantly unbalanced abundance ratios. To improve upon these current limitations, we present PuzzleCluster, a novel unsupervised binning algorithm. PuzzleCluster incorporates a unique cluster refinement step by automatically grouping reads which share a nucleotide word (i.e. reverse complement pairs) of a predetermined length. Additionally, the clustering parameters are estimated by fitting the Jensen-Shannon distance among sequences using the expectation maximization algorithm. Since clustering parameters are computed based on each dataset, our approach can adapt to the peculiarities of each dataset and is not confined by universal parameters. Furthermore, PuzzleCluster utilizes no prior assumptions about the genetic makeup or number of organisms present in the sample, making it well-suited for applications with a large amount of biodiversity and completely unknown organisms. As a comparison, PuzzleCluster has an accuracy 9%, 19.8%, 15.7%, and 19.5% higher than MetaCluster 3.0 for taxonomic levels phylum, class, order, and family, respectively. PuzzleCluster source code is freely available at http://math.stanford.edu/~ksiegel/PuzzleCluster.html.

    Original languageEnglish
    Pages (from-to)225-231
    Number of pages7
    JournalCurrent Bioinformatics
    Volume10
    Issue number2
    DOIs
    Publication statusPublished - 1 Jun 2015

    Keywords

    • Clustering
    • Expectation maximization
    • Jensen-Shannon distance
    • Metagenome
    • Quality threshold algorithm
    • Word agreement

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