2017
DOI: 10.1073/pnas.1703070114
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Genomic diversification of giant enteric symbionts reflects host dietary lifestyles

Abstract: Herbivorous surgeonfishes are an ecologically successful group of reef fish that rely on marine algae as their principal food source. Here, we elucidated the significance of giant enteric symbionts colonizing these fishes regarding their roles in the digestive processes of hosts feeding predominantly on polysiphonous red algae and brown Turbinaria algae, which contain different polysaccharide constituents. Using metagenomics, single-cell genomics, and metatranscriptomic analyses, we provide evidence of metabol… Show more

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Cited by 75 publications
(50 citation statements)
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“…However, their putative functions in the intestine are unclear. Metagenomic analyses and studies that experimentally elucidate the functions of intestinal microbes [41] are particularly needed to disentangle which microbiome members are drivers versus passengers of herbivorous fish feeding behaviour.…”
Section: Discussionmentioning
confidence: 99%
“…However, their putative functions in the intestine are unclear. Metagenomic analyses and studies that experimentally elucidate the functions of intestinal microbes [41] are particularly needed to disentangle which microbiome members are drivers versus passengers of herbivorous fish feeding behaviour.…”
Section: Discussionmentioning
confidence: 99%
“…( Fig. 5C , Extended Data 9, Supplemental Tables 11, 12, 13 ), the latter being abundant colonizers of marine surgeonfish 27 . Sequence-based surveys of surgeonfish gut microbiomes have previously detected enzymes in these same families in metagenome- and single cell isolation-based genome sequences belonging to Epulopiscium spp.…”
Section: Human Gut Firmicutes With Genetic Upgrades To Degrade Seaweementioning
confidence: 99%
“…Other surgeonfishes with different diets such as Ctenochaetus striatus (bristle-like teeth) and A. nigrofuscus (incisiform teeth) display very different dental morphology (Tebbett et al, 2017a). It is quite possible that the two species in our study are partitioning the turf community along axes that we did not resolve here, and thus, further studies such as analysis of composition of the their gastrointestinal symbionts (Ngugi et al, 2017) may help to elucidate differences in their feeding niches.…”
Section: Discussionmentioning
confidence: 93%
“…By contrast, as a result of less efficient methods of processing its food, higher gut turnover rates could be required by A. tractus , akin to terrestrial hindgut fermenters. Other factors such as the enzymatic activity carried out by endosymbiotic bacteria (Ngugi et al, ) might also influence the digestive capabilities of Caribbean Acanthurus species but further work is needed to test this hypothesis.…”
Section: Discussionmentioning
confidence: 99%