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Title: Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria

Abstract

For free-living bacteria and archaea, the equivalent of the biological species concept does not exist, creating several obstacles to the study of the processes contributing to microbial diversification. These obstacles are particularly high in soil, where high bacterial diversity inhibits the study of closely related genotypes and therefore the factors structuring microbial populations. Here, we isolated strains within a singleCurtobacteriumecotype from surface soil (leaf litter) across a regional climate gradient and investigated the phylogenetic structure, recombination, and flexible gene content of this genomic diversity to infer patterns of gene flow. Our results indicate that microbial populations are delineated by gene flow discontinuities, with distinct populations cooccurring at multiple sites. Bacterial population structure was further delineated by genomic features allowing for the identification of candidate genes possibly contributing to local adaptation. These results suggest that the genetic structure within this bacterium is maintained both by ecological specialization in localized microenvironments (isolation by environment) and by dispersal limitation between geographic locations (isolation by distance).

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [4];  [5];  [6]
  1. Univ. of California, Irvine, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Irvine, CA (United States)
  6. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1581756
Grant/Contract Number:  
AC02-05CH11231; SC0016410
Resource Type:
Accepted Manuscript
Journal Name:
mBio (Online)
Additional Journal Information:
Journal Name: mBio (Online); Journal Volume: 10; Journal Issue: 5; Journal ID: ISSN 2150-7511
Publisher:
American Society for Microbiology
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; curtobacterium; population structure; gene flow; microbial ecology; ecotype

Citation Formats

Chase, Alexander B., Arevalo, Philip, Brodie, Eoin L., Polz, Martin F., Karaoz, Ulas, Martiny, Jennifer B. H., and Taylor, John W. Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria. United States: N. p., 2019. Web. doi:10.1128/mBio.02361-19.
Chase, Alexander B., Arevalo, Philip, Brodie, Eoin L., Polz, Martin F., Karaoz, Ulas, Martiny, Jennifer B. H., & Taylor, John W. Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria. United States. https://doi.org/10.1128/mBio.02361-19
Chase, Alexander B., Arevalo, Philip, Brodie, Eoin L., Polz, Martin F., Karaoz, Ulas, Martiny, Jennifer B. H., and Taylor, John W. Tue . "Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria". United States. https://doi.org/10.1128/mBio.02361-19. https://www.osti.gov/servlets/purl/1581756.
@article{osti_1581756,
title = {Maintenance of Sympatric and Allopatric Populations in Free-Living Terrestrial Bacteria},
author = {Chase, Alexander B. and Arevalo, Philip and Brodie, Eoin L. and Polz, Martin F. and Karaoz, Ulas and Martiny, Jennifer B. H. and Taylor, John W.},
abstractNote = {For free-living bacteria and archaea, the equivalent of the biological species concept does not exist, creating several obstacles to the study of the processes contributing to microbial diversification. These obstacles are particularly high in soil, where high bacterial diversity inhibits the study of closely related genotypes and therefore the factors structuring microbial populations. Here, we isolated strains within a singleCurtobacteriumecotype from surface soil (leaf litter) across a regional climate gradient and investigated the phylogenetic structure, recombination, and flexible gene content of this genomic diversity to infer patterns of gene flow. Our results indicate that microbial populations are delineated by gene flow discontinuities, with distinct populations cooccurring at multiple sites. Bacterial population structure was further delineated by genomic features allowing for the identification of candidate genes possibly contributing to local adaptation. These results suggest that the genetic structure within this bacterium is maintained both by ecological specialization in localized microenvironments (isolation by environment) and by dispersal limitation between geographic locations (isolation by distance).},
doi = {10.1128/mBio.02361-19},
journal = {mBio (Online)},
number = 5,
volume = 10,
place = {United States},
year = {Tue Oct 29 00:00:00 EDT 2019},
month = {Tue Oct 29 00:00:00 EDT 2019}
}

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Cited by: 18 works
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Works referencing / citing this record:

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