Defining and quantifying the core microbiome: Challenges and prospects

Alexander T. Neu et al.; PNAS December 21, 2021 118 (51) e2104429118

The term “core microbiome” has become widely used in microbial ecology over the last decade. Broadly, the core microbiome refers to any set of microbial taxa, or the genomic and functional attributes associated with those taxa, that are characteristic of a host or environment of interest. Most commonly, core microbiomes are measured as the microbial taxa shared among two or more samples from a particular host or environment. Despite the popularity of this term and its growing use, there is little consensus about how a core microbiome should be quantified in practice. Here, we present a brief history of the core microbiome concept and use a representative sample of the literature to review the different metrics commonly used for quantifying the core. Empirical analyses have used a wide range of metrics for quantifying the core microbiome, including arbitrary occurrence and abundance cutoff values, with the focal taxonomic level of the core ranging from phyla to amplicon sequence variants. However, many of these metrics are susceptible to sampling and other biases. Developing a standardized set of metrics for quantifying the core that accounts for such biases is necessary for testing specific hypotheses about the functional and ecological roles of core microbiomes.

See: https://www.pnas.org/content/118/51/e2104429118

Figure: Number of publications per year (A) and cumulative publications (B) in Google Scholar including the terms “core microbiome” or “core microbiota” from the introduction of the term in 2007 to 2019 (search conducted on December 22, 2020).