Title: Quantifying the local adaptive landscape of a nascent bacterial community

Journal Article · · Nature Communications

Abstract The fitness effects of all possible mutations available to an organism largely shape the dynamics of evolutionary adaptation. Yet, whether and how this adaptive landscape changes over evolutionary times, especially upon ecological diversification and changes in community composition, remains poorly understood. We sought to fill this gap by analyzing a stable community of two closely related ecotypes (“L” and “S”) shortly after they emerged within the E. coli Long-Term Evolution Experiment (LTEE). We engineered genome-wide barcoded transposon libraries to measure the invasion fitness effects of all possible gene knockouts in the coexisting strains as well as their ancestor, for many different, ecologically relevant conditions. We find consistent statistical patterns of fitness effect variation across both genetic background and community composition, despite the idiosyncratic behavior of individual knockouts. Additionally, fitness effects are correlated with evolutionary outcomes for a number of conditions, possibly revealing shifting patterns of adaptation. Together, our results reveal how ecological and epistatic effects combine to shape the adaptive landscape in a nascent ecological community.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1909251
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (69)

Fluid Communities: A Competitive, Scalable and Diverse Community Detection Algorithm book November 2017
Long-Term Experimental Evolution in Escherichia coli. XIII. Phylogenetic History of a Balanced Polymorphism journal June 2005
Bayesian point null hypothesis testing via the posterior likelihood ratio journal July 2005
Development of a Comprehensive Genotype-to-Fitness Map of Adaptation-Driving Mutations in Yeast journal September 2016
Adaptive Evolution within Gut Microbiomes of Healthy People journal May 2019
Quantifying rapid bacterial evolution and transmission within the mouse intestine journal September 2021
The Speed of Evolution and Maintenance of Variation in Asexual Populations journal March 2007
Hidden Complexity of Yeast Adaptation under Simple Evolutionary Conditions journal February 2018
Evolution of high mutation rates in experimental populations of E. coli journal June 1997
Quantitative evolutionary dynamics using high-resolution lineage tracking journal February 2015
Tempo and mode of genome evolution in a 50,000-generation experiment journal August 2016
The dynamics of molecular evolution over 60,000 generations journal October 2017
Adaptation of Pseudomonas aeruginosa to the cystic fibrosis airway: an evolutionary perspective journal November 2012
Prochlorococcus: the structure and function of collective diversity journal December 2014
The dynamics of adaptive genetic diversity during the early stages of clonal evolution journal December 2018
Single nucleotide mapping of trait space reveals Pareto fronts that constrain adaptation journal October 2019
Mutualism-enhancing mutations dominate early adaptation in a two-species microbial community journal January 2023
Renewing Felsenstein’s phylogenetic bootstrap in the era of big data journal April 2018
Mutant phenotypes for thousands of bacterial genes of unknown function journal May 2018
High-resolution lineage tracking reveals travelling wave of adaptation in laboratory yeast journal November 2019
GOATOOLS: A Python library for Gene Ontology analyses journal July 2018
Historical contingency and the evolution of a key innovation in an experimental population of Escherichia coli journal June 2008
Distribution of fixed beneficial mutations and the rate of adaptation in asexual populations journal February 2012
Crowded growth leads to the spontaneous evolution of semistable coexistence in laboratory yeast populations journal August 2015
Adaptation limits ecological diversification and promotes ecological tinkering during the competition for substitutable resources journal October 2018
Evolutionary consequences of niche construction and their implications for ecology journal August 1999
A Third Bacterial System for the Assembly of Iron-Sulfur Clusters with Homologs in Archaea and Plastids journal June 2002
Long-Term Experimental Evolution in Escherichia coli. II. Changes in Life-History Traits During Adaptation to a Seasonal Environment journal September 1994
Long‐Term Experimental Evolution in Escherichia coli . VIII. Dynamics of a Balanced Polymorphism journal January 2000
EcoliNet: a database of cofunctional gene network for Escherichia coli journal January 2015
GEOquery: a bridge between the Gene Expression Omnibus (GEO) and BioConductor journal May 2007
Core Genes Evolve Rapidly in the Long-Term Evolution Experiment with Escherichia coli journal April 2017
Evolution of Escherichia coli During Growth in a Constant Environment journal July 1987
The Distribution of Fitness Effects Among Beneficial Mutations journal April 2003
Recurrent Reverse Evolution Maintains Polymorphism after Strong Bottlenecks in Commensal Gut Bacteria journal August 2017
Effects of Beneficial Mutations in pykF Gene Vary over Time and across Replicate Populations in a Long-Term Experiment with Bacteria journal October 2017
Eco-evolutionary feedbacks in community and ecosystem ecology: interactions between the ecological theatre and the evolutionary play journal June 2009
Microbial ecology of the cystic fibrosis lung journal April 2007
Performance of modularity maximization in practical contexts journal April 2010
On Modularity Clustering journal February 2008
Molecular signatures of resource competition: Clonal interference favors ecological diversification and can lead to incipient speciation* journal August 2021
Death and cannibalism in a seasonal environment facilitate bacterial coexistence journal January 2009
The Microbial Engines That Drive Earth's Biogeochemical Cycles journal May 2008
Negative Epistasis Between Beneficial Mutations in an Evolving Bacterial Population journal June 2011
Long-Term Dynamics of Adaptation in Asexual Populations journal November 2013
Epistasis and Allele Specificity in the Emergence of a Stable Polymorphism in Escherichia coli journal March 2014
Global epistasis makes adaptation predictable despite sequence-level stochasticity journal June 2014
Higher-fitness yeast genotypes are less robust to deleterious mutations journal October 2019
Idiosyncratic epistasis leads to global fitness–correlated trends journal May 2022
Rapid Quantification of Mutant Fitness in Diverse Bacteria by Sequencing Randomly Bar-Coded Transposons journal May 2015
Metabolic modelling in a dynamic evolutionary framework predicts adaptive diversification of bacteria in a long-term evolution experiment journal August 2016
Equivalence between the Posterior Distribution of the Likelihood Ratio and a p-value in an Invariant Frame journal December 2014
Ex Uno Plures: Clonal Reinforcement Drives Evolution of a Simple Microbial Community journal June 2014
Parallel Evolutionary Dynamics of Adaptive Diversification in Escherichia coli journal February 2013
Evolutionary dynamics of bacteria in the gut microbiome within and across hosts journal January 2019
High-Throughput Identification of Adaptive Mutations in Experimentally Evolved Yeast Populations journal October 2016
Beneficial Mutation–Selection Balance and the Effect of Linkage on Positive Selection journal May 2007
The Impact of Macroscopic Epistasis on Long-Term Evolutionary Dynamics journal November 2014
The Evolutionarily Stable Distribution of Fitness Effects journal March 2015
Linear Models and Empirical Bayes Methods for Assessing Differential Expression in Microarray Experiments journal January 2004
Molecular Evolution Over the Mutational Landscape journal September 1984
The Population Genetics of Adaptation: The Distribution of Factors Fixed during Adaptive Evolution journal August 1998
Statsmodels: Econometric and Statistical Modeling with Python conference January 2010
Microbes as Engines of Ecosystem Function: When Does Community Structure Enhance Predictions of Ecosystem Processes? journal February 2016
Human Gut Microbiota: Toward an Ecology of Disease journal July 2017
Eco-evolutionary dynamics of complex social strategies in microbial communities journal January 2014
Diversity and asynchrony in soil microbial communities stabilizes ecosystem functioning journal March 2021
Fitness variation across subtle environmental perturbations reveals local modularity and global pleiotropy of adaptation journal December 2020
Global epistasis emerges from a generic model of a complex trait journal March 2021