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Microbiota and host determinants of behavioural phenotype in maternally separated mice
There is growing evidence that the intestinal microbiota can affect host behaviour. Here, De Palma et al. show in mice that early-life stress (maternal separation) induces changes in host physiology that alter the gut microbiota, which then triggers anxiety-like and depression-like behaviour later in life.
- G. De Palma
- , P. Blennerhassett
- & P. Bercik
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| Open AccessGut microbiota mediate caffeine detoxification in the primary insect pest of coffee
The coffee berry borer, the main insect pest of coffee, feeds and lives on the caffeine-rich beans despite caffeine’s toxic effects. Here Ceja-Navarro et al. show that certain microbes, including Pseudomonasspecies, mediate caffeine detoxification in the insect’s gut.
- Javier A. Ceja-Navarro
- , Fernando E. Vega
- & Eoin L. Brodie
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| Open AccessDiscovery of intramolecular trans-sialidases in human gut microbiota suggests novel mechanisms of mucosal adaptation
Mucosal sialoglycans contribute to host–microbe interactions at mucosal surfaces and impact bacterial colonization of the digestive system. Here the authors identify and characterize an intramolecular trans-sialidase produced by the gut bacterium R. gnavusATCC 29149 that may contribute to adaptation to the mucosal environment.
- Louise E. Tailford
- , C. David Owen
- & Nathalie Juge
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| Open AccessMetabolic and metagenomic outcomes from early-life pulsed antibiotic treatment
The potential recovery of the human gut microbiota after an antibiotic treatment, and its effects on our health, are poorly understood. Here, the authors use a mouse model mimicking paediatric antibiotic use to shed new light into these processes.
- Yael R. Nobel
- , Laura M. Cox
- & Martin J. Blaser
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| Open AccessGlycan complexity dictates microbial resource allocation in the large intestine
The human gut microbiota helps us to degrade complex dietary carbohydrates such as xylan and, in turn, the carbohydrate breakdown products control the structure of the microbiota. Here the authors characterize the xylan-degrading apparatus of a key member of the gut microbiota, Bacteroides ovatus.
- Artur Rogowski
- , Jonathon A. Briggs
- & David N. Bolam
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Metabolite-sensing receptors GPR43 and GPR109A facilitate dietary fibre-induced gut homeostasis through regulation of the inflammasome
Dietary fibre is metabolized into short-chain fatty acids by gut bacteria. Here the authors show that these metabolites activate the NLRP3 inflammasome in gut epithelial cells and protect mice from injury-induced colitis, suggesting a mechanism for the benefits of a high-fibre diet.
- Laurence Macia
- , Jian Tan
- & Charles R. Mackay
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| Open AccessSubsistence strategies in traditional societies distinguish gut microbiomes
The gut microbiomes of urban-industrialized societies differ from those of traditional rural societies and hunter-gatherers. Here the authors perform a comparative analysis of available and new gut microbiome data to provide fresh insight into these differences.
- Alexandra J. Obregon-Tito
- , Raul Y. Tito
- & Cecil M. Lewis
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Gut microbiome development along the colorectal adenoma–carcinoma sequence
The gut microbiota is involved in the development of colorectal cancer. Here, the authors analyse the faecal microbiomes of healthy subjects and of patients with colorectal cancer or benign adenoma, revealing microbial genes, strains and functions enriched in each group.
- Qiang Feng
- , Suisha Liang
- & Jun Wang
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| Open AccessAnalysis of intestinal microbiota in hybrid house mice reveals evolutionary divergence in a vertebrate hologenome
Animal hosts and their associated microbes are largely the outcome of coevolution. Here, the authors show differences in the intestinal microbiome of hybrids compared with pure species of house mice, which suggests that host–microbiome interactions contribute to the evolution of host species.
- Jun Wang
- , Shirin Kalyan
- & John F. Baines
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Metabolic cross-feeding via intercellular nanotubes among bacteria
Some bacteria can form nanotubes to transfer proteins and plasmids between neighbouring cells. Here, the authors show that nanotubes can also mediate the exchange of cytoplasmic amino acids between cells of the same or different bacterial species.
- Samay Pande
- , Shraddha Shitut
- & Christian Kost
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Host genetic determinants of microbiota-dependent nutrition revealed by genome-wide analysis of Drosophila melanogaster
The gut microbiota affects animal nutrition, but it is unclear whether this effect depends on host genetic makeup. This study shows that host genotype modifies the gut microbiota’s impact on host nutrition, and identifies genetic determinants of this variation in the fruit fly.
- Adam J. Dobson
- , John M. Chaston
- & Angela E. Douglas
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| Open AccessBacteria can mobilize nematode-trapping fungi to kill nematodes
Certain soil fungi form specialized cellular structures or 'traps' to feed on nematodes, which in turn eat bacteria. Here, the authors show that urea released from bacteria induces trap formation in the fungi and this promotes nematode elimination.
- Xin Wang
- , Guo-Hong Li
- & Ke-Qin Zhang
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Symbiotic adaptations in the fungal cultivar of leaf-cutting ants
Leaf-cutting ants cultivate fungi that have evolved inflated hyphal cells, known as gongylidia, on which the ants feed. Here, the authors perform genetic and transcriptomic analyses of gongylidia, supporting that these fungal structures provide the ants with essential amino acids and plant-degrading enzymes.
- Henrik H. De Fine Licht
- , Jacobus J. Boomsma
- & Anders Tunlid
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| Open AccessCommunity-integrated omics links dominance of a microbial generalist to fine-tuned resource usage
Within microbial communities, microorganisms adopt different lifestyle strategies to use the available resources. Here, the authors use an integrated ‘multi-omic’ approach to study niche breadth (generalist versus specialist lifestyles) in oleaginous microbial assemblages from an anoxic wastewater treatment tank.
- Emilie E. L. Muller
- , Nicolás Pinel
- & Paul Wilmes
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The microbiome of New World vultures
Vultures are scavengers with a high tolerance to bacterial toxins in decaying meat. Here, Roggenbuck et al.show that the vulture’s gut microbiome displays unique features and is dominated by Clostridia and Fusobacteria, two bacterial groups commonly associated with infectious disease in other animals.
- Michael Roggenbuck
- , Ida Bærholm Schnell
- & Lars H Hansen
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Genome-wide association study of Arabidopsis thaliana leaf microbial community
The effect of a host's genetic variation on the structure of its microbial community is poorly understood. Here, Horton et al. reveal associations between genetic variants in the plant model species Arabidopsis thalianaand the composition of the leaves' microbial communities.
- Matthew W. Horton
- , Natacha Bodenhausen
- & Joy Bergelson
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Niche and host-associated functional signatures of the root surface microbiome
Assembly of the root surface microbiome varies according to soil type and plant species. Here, Ofek-Lalzar et al.use metagenome and metatranscriptome analysis to reveal distinct functional signatures of microbial communities associated with two diverse plant hosts.
- Maya Ofek-Lalzar
- , Noa Sela
- & Dror Minz
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| Open AccessDiverse and divergent protein post-translational modifications in two growth stages of a natural microbial community
Characterizing post-translational modifications of proteins in microbial communities is challenging. Here, the authors identify and quantify a great number and diversity of such modifications in two growth stages of a natural microbial biofilm.
- Zhou Li
- , Yingfeng Wang
- & Chongle Pan
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| Open AccessTipping elements in the human intestinal ecosystem
Intestinal microbes can have important effects on our health. Here, the authors analyse the gut microbiota composition in 1,000 western adults and find that certain bacteria are either abundant or nearly absent, and that these alternative states are associated with ageing and overweight.
- Leo Lahti
- , Jarkko Salojärvi
- & Willem M. de Vos
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Evidence of global-scale aeolian dispersal and endemism in isolated geothermal microbial communities of Antarctica
Geographical isolation is often considered an effective barrier to microbial transport. Here, the authors provide evidence of active recruitment of long-distance dispersed cosmopolitan microorganisms in fumarolic environments in Mount Erebus, Antarctica.
- Craig W. Herbold
- , Charles K. Lee
- & S. Craig Cary
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| Open AccessAdjustment of microbial nitrogen use efficiency to carbon:nitrogen imbalances regulates soil nitrogen cycling
Nitrogen availability in soils is predominantly controlled by microorganisms, yet our understanding of their organic nitrogen use is limited. Mooshammer et al.show that microbial nitrogen use efficiency is dependent on resource stoichiometry and substrate type.
- Maria Mooshammer
- , Wolfgang Wanek
- & Andreas Richter
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Characterization and modelling of interspecies electron transfer mechanisms and microbial community dynamics of a syntrophic association
Microbial community function depends on metabolic interdependencies between individual species, some of which include electron transfer. Nagarajan et al. use genomic, transcriptomic and modelling approaches to describe the mechanisms supporting the syntrophic relationship between Geobacter metallireducens and Geobacter sulfurreducens.
- Harish Nagarajan
- , Mallory Embree
- & Karsten Zengler
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Evolutionary history predicts the stability of cooperation in microbial communities
Persistence of cooperation requires limited spread of defectors, but it is unclear how evolutionary history affects the spread of these individuals. Here, Jousset et al.show that microbial cooperators can only inhibit defectors that are closely related to them, suggesting that evolutionary history can predict the stability of cooperation.
- Alexandre Jousset
- , Nico Eisenhauer
- & Stefan Scheu
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Microbiome remodelling leads to inhibition of intestinal farnesoid X receptor signalling and decreased obesity
Tempol is an antioxidant that reduces the body weight of mice on a high-fat diet. Li et al.now provide a mechanistic link by demonstrating that tempol affects the intestinal microbiota, which leads to a change in the composition of bile acids and suppression of FXR signalling.
- Fei Li
- , Changtao Jiang
- & Frank J. Gonzalez
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Advection shapes Southern Ocean microbial assemblages independent of distance and environment effects
Environmental factors and distance are known to influence the structure of marine microbial communities. Using a data set spanning the Southern Ocean, Wilkins et al.now demonstrate that fluid transport (advection) is another important factor involved in shaping the marine microbial ecosystem.
- David Wilkins
- , Erik van Sebille
- & Ricardo Cavicchioli
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| Open AccessHuman gut microbiota community structures in urban and rural populations in Russia
The structure of the human gut microbiota has been shown to vary between populations. Tyakht et al.analyse the gut microbiota assembly from Russian individuals living in urban and rural areas, and compare these with previously studied populations.
- Alexander V. Tyakht
- , Elena S. Kostryukova
- & Vadim M. Govorun
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Social amoeba farmers carry defensive symbionts to protect and privatize their crops
The social amoeba Dictyostelium discoideum displays a primitive form of agriculture with some clones carrying bacteria to seed out food crops. Brock et al. now demonstrate that these farmers also carry non-food bacteria that harm competing non-farmer amoeba clones, protecting the crop from exploitation.
- Debra A. Brock
- , Silven Read
- & Joan E. Strassmann
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| Open AccessExtraordinary phylogenetic diversity and metabolic versatility in aquifer sediment
Turnover of sediment organic matter contributes to global carbon cycling, yet the microorganisms involved are largely unknown. Castelleet al.reveal that an aquifer sediment core hosts a ‘zoo’ of organisms, including representatives of a previously undescribed phylum (Zixibacteria).
- Cindy J. Castelle
- , Laura A. Hug
- & Jillian F. Banfield
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| Open AccessGenome sequence and functional genomic analysis of the oil-degrading bacterium Oleispira antarctica
Oleispira antarctica is an oil-degrading bacterium found in the cold and deep sea. Here Kube et al. report the genome sequence of O. antarcticaand provide a comprehensive functional genetic and protein structural analysis, revealing insights into how this organism has adapted to its cold environment.
- Michael Kube
- , Tatyana N. Chernikova
- & Peter N. Golyshin
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| Open AccessBacterial colonization dampens influenza-mediated acute lung injury via induction of M2 alveolar macrophages
Bacterial infections can influence disease outcome in influenza infection; however, the mechanisms mediating these complex interactions remain unclear. Wang et al. reveal how infection with a component of the airway microbiota enhances survival during influenza infection via induction of anti-inflammatory macrophages.
- Jian Wang
- , Fengqi Li
- & Zhigang Tian
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| Open AccessCarbon dioxide concentration dictates alternative methanogenic pathways in oil reservoirs
Deep subsurface formations are potential sites for carbon capture and storage but how subsurface microbial communities may respond to this is not clear. Here, Mayumi et al. construct microcosms and show that increasing CO2partial pressure via carbon capture and storage more than doubles the rate of methanogenesis.
- Daisuke Mayumi
- , Jan Dolfing
- & Yoichi Kamagata
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Single-cell and metagenomic analyses indicate a fermentative and saccharolytic lifestyle for members of the OP9 lineage
OP9 is a yet-uncultivated bacterial lineage found in anaerobic environments. Dodsworth et al. use single-cell genomics and metagenomics to construct two near-complete OP9 genomes, revealing a fermentative metabolism and supporting the designation of OP9 as candidate phylum 'Atribacteria'.
- Jeremy A. Dodsworth
- , Paul C. Blainey
- & Brian P. Hedlund
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A novel metatranscriptomic approach to identify gene expression dynamics during extracellular electron transfer
Extracellular electron transfer is a ubiquitous process that occurs in natural microbial communities. Here, Ishii et al.identify specific microbial strains and genes involved in extracellular electron transfer in a biofilm community that is associated with a microbial fuel cell.
- Shun’ichi Ishii
- , Shino Suzuki
- & Orianna Bretschger
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The microbiome extends to subepidermal compartments of normal skin
Microbes living in human skin are known to influence the immune system; however, the deeper layers in which immune cells reside were thought to be largely impervious to bacteria. Nakatsuji et al.show that the skin microbiome extends into the dermis, enabling contact with cells below the basement membrane.
- Teruaki Nakatsuji
- , Hsin-I. Chiang
- & Richard L. Gallo
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Environmental conditions and community evenness determine the outcome of biological invasion
Biological invasion varies under different environmental stressors. Here, using a fully controlled system of bacterial communities, De Roy et al. find that community evenness affects the level of invasion, and that the community’s response depends on specific environmental conditions as well as the community evenness.
- Karen De Roy
- , Massimo Marzorati
- & Nico Boon
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Different types of synchrony in chaotic and cyclic communities
Natural populations are complex systems where interactions can lead to chaotic dynamics. This study tests how cyclic and chaotic microbial predator–prey communities synchronize, showing different phase-locking responses for cyclic and chaotic systems.
- Lutz Becks
- & Hartmut Arndt
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| Open AccessSymptomatic atherosclerosis is associated with an altered gut metagenome
The gut microbiota has emerged as an environmental factor that can influence the development of obesity and diabetes. Here, Karlsson et al. report compositional and functional alterations of the gut metagenome in patients with symptomatic atherosclerosis.
- Fredrik H. Karlsson
- , Frida Fåk
- & Jens Nielsen
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Competition–colonization dynamics in experimental bacterial metacommunities
Species coexistence can be explained by the competition–colonization trade-off theory. Here, Livingston et al. illustrate this theory in a metacommunity experiment using two bacterial strains, finding a negative correlation between diversity and productivity when scaled to full metacommunities.
- George Livingston
- , Miguel Matias
- & Nicolas Mouquet
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Virtual metagenome reconstruction from 16S rRNA gene sequences
Large-scale sequencing techniques have helped to understand the genetic diversity of little-known microbial communities. These authors demonstrate a cheaper alternative to direct sequencing—the construction of virtual metagenomes using gel electrophoresis and related genome sequences.
- Shujiro Okuda
- , Yuki Tsuchiya
- & Hisao Morisaki
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Chimpanzees and humans harbour compositionally similar gut enterotypes
Humans tend to adopt one of a limited number of different bacterial community structures in the gut, known as enterotypes. Moeller et al.now show that these microbial fingerprints are conserved in chimpanzees, and that individuals can switch between enterotypes over periods of several years.
- Andrew H. Moeller
- , Patrick H. Degnan
- & Howard Ochman
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| Open AccessContrasting arbuscular mycorrhizal responses of vascular and non-vascular plants to a simulated Palaeozoic CO2 decline
Vascular plants with root systems evolved in the mid-Palaeozoic with symbiotic fungi. Fieldet al. show that in contrast to non-vascular plants lacking roots, the efficiency of plant–fungal symbiosis increased for vascular plants with root systems as carbon dioxide levels declined in the mid-Palaeozoic.
- Katie J. Field
- , Duncan D. Cameron
- & David J. Beerling
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Rapid microbial response to the presence of an ancient relic in the Antarctic Dry Valleys
It is thought that turnover in soil microbiota occurs very slowly in the Antarctic Dry Valleys due to the extreme cold and aridity. Now, Tiaoet al. show that a transformation of microbial communities can happen in a matter of years in soils altered by the presence of a mummified seal.
- Grace Tiao
- , Charles K. Lee
- & S. Craig Cary
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Competitive and cooperative metabolic interactions in bacterial communities
Genome-scale metabolic models for bacterial species allow a systematic study of inter-species interactions. Here, competitive and cooperative potential is predicted between 6,903 pairs of species, to explore the role of these interactions in shaping coexistence patterns in natural communities.
- Shiri Freilich
- , Raphy Zarecki
- & Eytan Ruppin