Species interactions differ in their genetic robustness

Chubiz, Lon M.; Granger, Brian R.; Segre, Daniel; Harcombe, William R.

doi:10.3389/fmicb.2015.00271

Title: Species interactions differ in their genetic robustness

Journal Article · Tue Apr 14 00:00:00 EDT 2015 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2015.00271· OSTI ID:1185123

Chubiz, Lon M. ^[1]; Granger, Brian R. ^[2]; Segre, Daniel ^[2]; Harcombe, William R. ^[3]

Univ. of Missouri - St. Louis, MO (United States). Dept. of Biology
Boston Univ., MA (United States). Bioinformatics Program
Univ. of Minnesota, St. Paul, MN (United States). Dept. of Ecology, Evolution, and Behavior and BioTechnology Inst.

Conflict and cooperation between bacterial species drive the composition and function of microbial communities. Stability of these emergent properties will be influenced by the degree to which species' interactions are robust to genetic perturbations. We use genome-scale metabolic modeling to computationally analyze the impact of genetic changes when Escherichia coli and Salmonella enterica compete, or cooperate. We systematically knocked out in silico each reaction in the metabolic network of E. coli to construct all 2583 mutant stoichiometric models. Then, using a recently developed multi-scale computational framework, we simulated the growth of each mutant E. coli in the presence of S. enterica. The type of interaction between species was set by modulating the initial metabolites present in the environment. We found that the community was most robust to genetic perturbations when the organisms were cooperating. Species ratios were more stable in the cooperative community, and community biomass had equal variance in the two contexts. Additionally, the number of mutations that have a substantial effect is lower when the species cooperate than when they are competing. In contrast, when mutations were added to the S. enterica network the system was more robust when the bacteria were competing. These results highlight the utility of connecting metabolic mechanisms and studies of ecological stability. Cooperation and conflict alter the connection between genetic changes and properties that emerge at higher levels of biological organization.

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Research Organization:: Boston Univ., MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Institutes of Health (NIH)

Grant/Contract Number:: SC0004962

OSTI ID:: 1185123

Journal Information:: Frontiers in Microbiology, Vol. 6, Issue C; ISSN 1664-302X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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