Host-microbe coevolution: applying evidence from model systems to complex marine invertebrate holobionts

O'Brien, Paul, Webster, Nicole S., Miller, David J., and Bourne, David G. (2019) Host-microbe coevolution: applying evidence from model systems to complex marine invertebrate holobionts. mBio, 10 (1). e02241-18.

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Abstract

Marine invertebrates often host diverse microbial communities, making it difficult to identify important symbionts and to understand how these communities are structured. This complexity has also made it challenging to assign microbial functions and to unravel the myriad of interactions among the microbiota. Here we propose to address these issues by applying evidence from model systems of host-microbe coevolution to complex marine invertebrate microbiomes. Coevolution is the reciprocal adaptation of one lineage in response to another and can occur through the interaction of a host and its beneficial symbiont. A classic indicator of coevolution is codivergence of host and microbe, and evidence of this is found in both corals and sponges. Metabolic collaboration between host and microbe is often linked to codivergence and appears likely in complex holobionts, where microbial symbionts can interact with host cells through production and degradation of metabolic compounds. Neutral models are also useful to distinguish selected microbes against a background population consisting predominately of random associates. Enhanced understanding of the interactions between marine invertebrates and their microbial communities is urgently required as coral reefs face unprecedented local and global pressures and as active restoration approaches, including manipulation of the microbiome, are proposed to improve the health and tolerance of reef species. On the basis of a detailed review of the literature, we propose three research criteria for examining coevolution in marine invertebrates: (i) identifying stochastic and deterministic components of the microbiome, (ii) assessing codivergence of host and microbe, and (iii) confirming the intimate association based on shared metabolic function.

Item ID: 57484
Item Type: Article (Research - C1)
ISSN: 2150-7511
Keywords: codivergence; coevolution; marine invertebrates; microbiome; phylosymbiosis
Copyright Information: Copyright © 2019 O'Brien et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.
Date Deposited: 19 Mar 2019 02:07
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060309 Phylogeny and Comparative Analysis @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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