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Research Article

Biotic Interactions Shape the Ecological Distributions of Staphylococcus Species

Erik K. Kastman, Noelani Kamelamela, Josh W. Norville, Casey M. Cosetta, Rachel J. Dutton, Benjamin E. Wolfe
John W. Taylor, Editor
Erik K. Kastman
Department of Biology, Tufts University, Medford, Massachusetts, USA
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Noelani Kamelamela
Department of Biology, Tufts University, Medford, Massachusetts, USA
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Josh W. Norville
Department of Biology, Tufts University, Medford, Massachusetts, USA
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Casey M. Cosetta
Department of Biology, Tufts University, Medford, Massachusetts, USA
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Rachel J. Dutton
Division of Biological Sciences, University of California, San Diego, La Jolla, California, USA
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Benjamin E. Wolfe
Department of Biology, Tufts University, Medford, Massachusetts, USA
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John W. Taylor
University of California
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DOI: 10.1128/mBio.01157-16
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This article has a correction. Please see:

  • Erratum for Kastman et al., “Biotic Interactions Shape the Ecological Distributions of Staphylococcus Species”
    - March 21, 2017

ABSTRACT

Many metagenomic sequencing studies have observed the presence of closely related bacterial species or genotypes in the same microbiome. Previous attempts to explain these patterns of microdiversity have focused on the abiotic environment, but few have considered how biotic interactions could drive patterns of microbiome diversity. We dissected the patterns, processes, and mechanisms shaping the ecological distributions of three closely related Staphylococcus species in cheese rind biofilms. Paradoxically, the most abundant species (S. equorum) is the slowest colonizer and weakest competitor based on growth and competition assays in the laboratory. Through in vitro community reconstructions, we determined that biotic interactions with neighboring fungi help resolve this paradox. Species-specific stimulation of the poor competitor by fungi of the genus Scopulariopsis allows S. equorum to dominate communities in vitro as it does in situ. Results of comparative genomic and transcriptomic experiments indicate that iron utilization pathways, including a homolog of the S. aureus staphyloferrin B siderophore operon pathway, are potential molecular mechanisms underlying Staphylococcus-Scopulariopsis interactions. Our integrated approach demonstrates that fungi can structure the ecological distributions of closely related bacterial species, and the data highlight the importance of bacterium-fungus interactions in attempts to design and manipulate microbiomes.

IMPORTANCE Decades of culture-based studies and more recent metagenomic studies have demonstrated that bacterial species in agriculture, medicine, industry, and nature are unevenly distributed across time and space. The ecological processes and molecular mechanisms that shape these distributions are not well understood because it is challenging to connect in situ patterns of diversity with mechanistic in vitro studies in the laboratory. Using tractable cheese rind biofilms and a focus on coagulase-negative staphylococcus (CNS) species, we demonstrate that fungi can mediate the ecological distributions of closely related bacterial species. One of the Staphylococcus species studied, S. saprophyticus, is a common cause of urinary tract infections. By identifying processes that control the abundance of undesirable CNS species, cheese producers will have more precise control on the safety and quality of their products. More generally, Staphylococcus species frequently co-occur with fungi in mammalian microbiomes, and similar bacterium-fungus interactions may structure bacterial diversity in these systems.

  • Copyright © 2016 Kastman et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Biotic Interactions Shape the Ecological Distributions of Staphylococcus Species
Erik K. Kastman, Noelani Kamelamela, Josh W. Norville, Casey M. Cosetta, Rachel J. Dutton, Benjamin E. Wolfe
mBio Oct 2016, 7 (5) e01157-16; DOI: 10.1128/mBio.01157-16

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Biotic Interactions Shape the Ecological Distributions of Staphylococcus Species
Erik K. Kastman, Noelani Kamelamela, Josh W. Norville, Casey M. Cosetta, Rachel J. Dutton, Benjamin E. Wolfe
mBio Oct 2016, 7 (5) e01157-16; DOI: 10.1128/mBio.01157-16
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