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Genetics and Genomics of Halophilic Microorganisms
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Genetics and Genomics of Halophilic Microorganisms

A special issue of Genes (ISSN 2073-4425). This special issue belongs to the section "Microbial Genetics and Genomics".

Deadline for manuscript submissions: closed (20 August 2022) | Viewed by 4775

Special Issue Editor

Prof. Dr. Rafael Montalvo-Rodríguez

E-Mail Website
Guest Editor
Department of Biology, University of Puerto Rico, Box 9000, Mayagüez, PR 00681, USA
Interests: microbiology; microbial physiology and genetics; taxonomy; microbial life in extreme environments; metagenomics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Halophiles thrive in environments with high salt concentrations, and representatives can be found in all domains of life. Their unique physiology and genetics make them a very interesting group. The main goal of this Special Issue entitled “Genetics of Halophilic Microorganisms” is to gather knowledge in the areas of genetics and physiology of halophilic microorganisms (from gene expression and regulation to transcriptomics, metabolomics, metagenomics, and comparative genomics) and their viruses. Colleagues are cordially invited to contribute original research papers or reviews to this Special Issue.

Prof. Dr. Rafael Montalvo-Rodríguez
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Genes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • halophiles
  • molecular genetics of halophiles
  • genomics of halophilic microorganisms
  • metagenomics and metabolomics of halophiles
  • halophilic viruses
  • hypersaline habitats

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Published Papers (2 papers)

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Research

23 pages, 4106 KiB  
Article
Deep Isolated Aquifer Brines Harbor Atypical Halophilic Microbial Communities in Quebec, Canada
by Jean-Christophe Gagnon, Samuel Beauregard-Tousignant, Jean-Sébastien Marcil and Cassandre Sara Lazar
Genes 2023, 14(8), 1529; https://doi.org/10.3390/genes14081529 - 26 Jul 2023
Cited by 1 | Viewed by 2159
Abstract
The deep terrestrial subsurface, hundreds of meters to kilometers below the surface, is characterized by oligotrophic conditions, dark and often anoxic settings, with fluctuating pH, salinity, and water availability. Despite this, microbial populations are detected and active, contributing to biogeochemical cycles over geological [...] Read more.
The deep terrestrial subsurface, hundreds of meters to kilometers below the surface, is characterized by oligotrophic conditions, dark and often anoxic settings, with fluctuating pH, salinity, and water availability. Despite this, microbial populations are detected and active, contributing to biogeochemical cycles over geological time. Because it is extremely difficult to access the deep biosphere, little is known about the identity and metabolisms of these communities, although they likely possess unknown pathways and might interfere with deep waste deposits. Therefore, we analyzed rock and groundwater microbial communities from deep, isolated brine aquifers in two regions dating back to the Ordovician and Devonian, using amplicon and whole genome sequencing. We observed significant differences in diversity and community structure between both regions, suggesting an impact of site age and composition. The deep hypersaline groundwater did not contain typical halophilic bacteria, and genomes suggested pathways involved in protein and hydrocarbon degradation, and carbon fixation. We identified mainly one strategy to cope with osmotic stress: compatible solute uptake and biosynthesis. Finally, we detected many bacteriophage families, potentially indicating that bacteria are infected. However, we also found auxiliary metabolic genes in the viral genomes, probably conferring an advantage to the infected hosts. Full article
(This article belongs to the Special Issue Genetics and Genomics of Halophilic Microorganisms)
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15 pages, 4127 KiB  
Article
Salt and Metal Tolerance Involves Formation of Guttation Droplets in Species of the Aspergillus versicolor Complex
by Marie Harpke, Sebastian Pietschmann, Nico Ueberschaar, Thomas Krüger, Olaf Kniemeyer, Axel A. Brakhage, Sandor Nietzsche and Erika Kothe
Genes 2022, 13(9), 1631; https://doi.org/10.3390/genes13091631 - 11 Sep 2022
Cited by 6 | Viewed by 2152
Abstract
Three strains of the Aspergillus versicolor complex were isolated from a salty marsh at a former uranium mining site in Thuringia, Germany. The strains from a metal-rich environment were not only highly salt tolerant (up to 20% NaCl), but at the same time [...] Read more.
Three strains of the Aspergillus versicolor complex were isolated from a salty marsh at a former uranium mining site in Thuringia, Germany. The strains from a metal-rich environment were not only highly salt tolerant (up to 20% NaCl), but at the same time could sustain elevated Cs and Sr (both up to 100 mM) concentrations as well as other (heavy) metals present in the environment. During growth experiments when screening for differential cell morphology, the occurrence of guttation droplets was observed, specifically when elevated Sr concentrations of 25 mM were present in the media. To analyze the potential of metal tolerance being promoted by these excretions, proteomics and metabolomics of guttation droplets were performed. Indeed, proteins involved in up-regulated metabolic activities as well as in stress responses were identified. The metabolome verified the presence of amino sugars, glucose homeostasis-regulating substances, abscisic acid and bioactive alkaloids, flavones and quinones. Full article
(This article belongs to the Special Issue Genetics and Genomics of Halophilic Microorganisms)
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