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. 2015 Mar 14;16(1):183. doi: 10.1186/s12864-015-1406-7

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© Plaza Onate et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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4-mer distribution analysis for complex microbiota metagenomes compared to individual bacterial genomes. A, Bar diagram of quantitative metagenomics of gut microbiota from two healthy volunteers, donor #1 (blue) and #2 (red), aggregated to express the frequency of a selected number of taxonomic classes from the Bacteroidetes and Firmicutes phylums. B, Line graph showing the 4-mer distribution of metagenomic sequences from gut microbiota of donor #1 and #2. A histogram depicting the 4-mer abundance distribution is plotted to the right of the line graph. Distribution entropy is indicated (normalized Shannon Entropy). C, Scatter plot visualizes the 4-mer distribution entropy for 28 bacterial genomes and two gut microbiota metagenomes. D, The 28 bacterial genomes are divided into 6 objective clusters by non-supervised agglomerative hierarchical cluster analysis of metagenomic 4-mer distributions based on Ward’s minimum variance method.