Model Communities Hint at Promiscuous Metabolic Linkages between Ubiquitous Free-Living Freshwater Bacteria

MSphere
Sarahi L GarciaAlexander Eiler

Abstract

Genome streamlining is frequently observed in free-living aquatic microorganisms and results in physiological dependencies between microorganisms. However, we know little about the specificity of these microbial associations. In order to examine the specificity and extent of these associations, we established mixed cultures from three different freshwater environments and analyzed the cooccurrence of organisms using a metagenomic time series. Free-living microorganisms with streamlined genomes lacking multiple biosynthetic pathways showed no clear recurring pattern in their interaction partners. Free-living freshwater bacteria form promiscuous cooperative associations. This notion contrasts with the well-documented high specificities of interaction partners in host-associated bacteria. Considering all data together, we suggest that highly abundant free-living bacterial lineages are functionally versatile in their interactions despite their distinct streamlining tendencies at the single-cell level. This metabolic versatility facilitates interactions with a variable set of community members.

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Citations

Jan 30, 2019·Journal of Bacteriology·Julia A MarescaMartin W Hahn
Aug 17, 2019·The ISME Journal·Natalia García-GarcíaFernando Puente-Sánchez
Mar 16, 2019·Nature Reviews. Microbiology·Hans-Peter GrossartKeilor Rojas-Jimenez
Mar 24, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Alberto Pascual-GarcíaThomas Bell
Oct 1, 2020·MSystems·Rhiannon MondavSarahi L Garcia
Jun 11, 2020·FEMS Microbiology Ecology·Winifred M JohnsonHeidi Smith
Dec 29, 2020·MSystems·Elizabeth A MonaghanMichael S Rappé
Nov 18, 2021·Proceedings of the National Academy of Sciences of the United States of America·Suhyun KimJang-Cheon Cho
Nov 19, 2021·Frontiers in Microbiology·Priscilla P HempelJulia A Maresca

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