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Title: Phylogenetically Driven Sequencing of Extremely Halophilic Archaea Reveals Strategies for Static and Dynamic Osmo-response

Abstract

Organisms across the tree of life use a variety of mechanisms to respond to stress-inducing fluctuations in osmotic conditions. Cellular response mechanisms and phenotypes associated with osmoadaptation also play important roles in bacterial virulence, human health, agricultural production and many other biological systems. To improve understanding of osmoadaptive strategies, we have generated 59 high-quality draft genomes for the haloarchaea (a euryarchaeal clade whose members thrive in hypersaline environments and routinely experience drastic changes in environmental salinity) and analyzed these new genomes in combination with those from 21 previously sequenced haloarchaeal isolates. We propose a generalized model for haloarchaeal management of cytoplasmic osmolarity in response to osmotic shifts, where potassium accumulation and sodium expulsion during osmotic upshock are accomplished via secondary transport using the proton gradient as an energy source, and potassium loss during downshock is via a combination of secondary transport and non-specific ion loss through mechanosensitive channels. We also propose new mechanisms for magnesium and chloride accumulation. We describe the expansion and differentiation of haloarchaeal general transcription factor families, including two novel expansions of the TATA-binding protein family, and discuss their potential for enabling rapid adaptation to environmental fluxes. We challenge a recent high-profile proposal regarding the evolutionary originsmore » of the haloarchaea by showing that inclusion of additional genomes significantly reduces support for a proposed large-scale horizontal gene transfer into the ancestral haloarchaeon from the bacterial domain. The combination of broad (17 genera) and deep (≥5 species in four genera) sampling of a phenotypically unified clade has enabled us to uncover both highly conserved and specialized features of osmoadaptation. Finally, we demonstrate the broad utility of such datasets, for metagenomics, improvements to automated gene annotation and investigations of evolutionary processes.« less

Authors:
 [1];  [2];  [3];  [1];  [1];  [1];  [3];  [4];  [1];  [5];  [1];  [6]
  1. Univ. of California, Davis, CA (United States)
  2. Univ. of California, Davis, CA (United States); Proteome Software, Portland, OR (United States)
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  4. Université Grenoble Alpes, Grenoble (France); Centre National de la Recherche Scientifique, Grenoble (France); Commissariat à l'énergie Atomique et aux Énergies Alternatives, Grenoble (France)
  5. Univ. of Technology, Syndey (Australia)
  6. Univ. of Illinois at Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1579707
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
PLoS Genetics
Additional Journal Information:
Journal Volume: 10; Journal Issue: 11; Journal ID: ISSN 1553-7404
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Becker, Erin A., Seitzer, Phillip M., Tritt, Andrew, Larsen, David, Krusor, Megan, Yao, Andrew I., Wu, Dongying, Madern, Dominique, Eisen, Jonathan A., Darling, Aaron E., Facciotti, Marc T., and Whitaker, Rachel J. Phylogenetically Driven Sequencing of Extremely Halophilic Archaea Reveals Strategies for Static and Dynamic Osmo-response. United States: N. p., 2014. Web. doi:10.1371/journal.pgen.1004784.
Becker, Erin A., Seitzer, Phillip M., Tritt, Andrew, Larsen, David, Krusor, Megan, Yao, Andrew I., Wu, Dongying, Madern, Dominique, Eisen, Jonathan A., Darling, Aaron E., Facciotti, Marc T., & Whitaker, Rachel J. Phylogenetically Driven Sequencing of Extremely Halophilic Archaea Reveals Strategies for Static and Dynamic Osmo-response. United States. https://doi.org/10.1371/journal.pgen.1004784
Becker, Erin A., Seitzer, Phillip M., Tritt, Andrew, Larsen, David, Krusor, Megan, Yao, Andrew I., Wu, Dongying, Madern, Dominique, Eisen, Jonathan A., Darling, Aaron E., Facciotti, Marc T., and Whitaker, Rachel J. Thu . "Phylogenetically Driven Sequencing of Extremely Halophilic Archaea Reveals Strategies for Static and Dynamic Osmo-response". United States. https://doi.org/10.1371/journal.pgen.1004784. https://www.osti.gov/servlets/purl/1579707.
@article{osti_1579707,
title = {Phylogenetically Driven Sequencing of Extremely Halophilic Archaea Reveals Strategies for Static and Dynamic Osmo-response},
author = {Becker, Erin A. and Seitzer, Phillip M. and Tritt, Andrew and Larsen, David and Krusor, Megan and Yao, Andrew I. and Wu, Dongying and Madern, Dominique and Eisen, Jonathan A. and Darling, Aaron E. and Facciotti, Marc T. and Whitaker, Rachel J.},
abstractNote = {Organisms across the tree of life use a variety of mechanisms to respond to stress-inducing fluctuations in osmotic conditions. Cellular response mechanisms and phenotypes associated with osmoadaptation also play important roles in bacterial virulence, human health, agricultural production and many other biological systems. To improve understanding of osmoadaptive strategies, we have generated 59 high-quality draft genomes for the haloarchaea (a euryarchaeal clade whose members thrive in hypersaline environments and routinely experience drastic changes in environmental salinity) and analyzed these new genomes in combination with those from 21 previously sequenced haloarchaeal isolates. We propose a generalized model for haloarchaeal management of cytoplasmic osmolarity in response to osmotic shifts, where potassium accumulation and sodium expulsion during osmotic upshock are accomplished via secondary transport using the proton gradient as an energy source, and potassium loss during downshock is via a combination of secondary transport and non-specific ion loss through mechanosensitive channels. We also propose new mechanisms for magnesium and chloride accumulation. We describe the expansion and differentiation of haloarchaeal general transcription factor families, including two novel expansions of the TATA-binding protein family, and discuss their potential for enabling rapid adaptation to environmental fluxes. We challenge a recent high-profile proposal regarding the evolutionary origins of the haloarchaea by showing that inclusion of additional genomes significantly reduces support for a proposed large-scale horizontal gene transfer into the ancestral haloarchaeon from the bacterial domain. The combination of broad (17 genera) and deep (≥5 species in four genera) sampling of a phenotypically unified clade has enabled us to uncover both highly conserved and specialized features of osmoadaptation. Finally, we demonstrate the broad utility of such datasets, for metagenomics, improvements to automated gene annotation and investigations of evolutionary processes.},
doi = {10.1371/journal.pgen.1004784},
journal = {PLoS Genetics},
number = 11,
volume = 10,
place = {United States},
year = {Thu Nov 13 00:00:00 EST 2014},
month = {Thu Nov 13 00:00:00 EST 2014}
}

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