The evolution of ecological facilitation within mixed-species biofilms in the mouse gastrointestinal tract

The ISME Journal
Xiaoxi B LinJens Walter

Abstract

The eco-evolutionary interactions among members of the vertebrate gut microbiota that ultimately result in host-specific communities are poorly understood. Here we show that Lactobacillus reuteri coexists with  species that belong to the Lactobacillus johnsonii cluster (L. johnsonii, L. gasseri, and L taiwanensis) in a taxonomically wide range of rodents, suggesting cohabitation over evolutionary times. The two dominant Lactobacillus species found in wild mice establish a commensalistic relationship in gastric biofilms when introduced together into germ-free mice in which L. reuteri facilitates colonization of L. taiwanensis. Genomic analysis revealed allopatric diversification in strains of both species that originated from geographically separated locations (Scotland and France). Allopatry of the strains resulted in reduced formation of mixed biofilms in vitro, indicating that interspecies interactions in gastric Lactobacillus-biofilms are the result of an adaptive evolutionary process that occurred in a biogeographical context. In summary, these findings suggest that members within the vertebrate gut microbiota can evolve inter-dependencies through ecological facilitation, which could represent one mechanism by which host-sp...Continue Reading

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Citations

Sep 12, 2019·Frontiers in Microbiology·Nanna Mee Coops OlsenMette Burmølle
Dec 22, 2019·Applied and Environmental Microbiology·Gautam GaurMichael G Gänzle

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Datasets Mentioned

BETA
PRJNA384810

Methods Mentioned

BETA
confocal microscopy
Fluorescence

Software Mentioned

Seqmatch
- Matrix calculator
BayesHammer
GENECONV
MAFFT
megablast
BBMap
enveomics
PAML
SPAdes

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