Evaluating metagenomic analyses for undercharacterized environments: what's needed to light up the microbial dark matter?
Nickols, W. A.; McIver, L. J.; Walsh, A.; Zhang, Y.; Nearing, J.; Asnicar, F.; Nguyen, L.; Hartmann, E. M.; Franzosa, E. A.; Huttenhower, C.; Thompson, K. N.
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Non-human-associated microbial communities play important biological roles, but they remain less understood than human-associated communities. Here, we assess the impact of key environmental sample properties on a variety of state-of-the-art metagenomic analysis methods. In simulated datasets, all methods performed similarly at high taxonomic ranks, but newer marker-based methods incorporating metagenomic assembled genomes outperformed others at lower taxonomic levels. In real environmental data, taxonomic profiles assigned to the same sample by different methods showed little agreement at lower taxonomic levels, but the methods agreed better on community diversity estimates and estimates of the relationships between environmental parameters and microbial profiles.
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