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Zhang J, Noor ZZ, Baharuddin NH, Setu SA, Mohd Hamzah MAA, Zakaria ZA. Removal of Heavy Metals by Pseudomonas sp. - Model Fitting and Interpretation. Curr Microbiol 2024; 81:312. [PMID: 39155344 DOI: 10.1007/s00284-024-03832-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Accepted: 08/03/2024] [Indexed: 08/20/2024]
Abstract
Industrial and urban modernization processes generate significant amounts of heavy metal wastewater, which brings great harm to human production and health. The biotechnology developed in recent years has gained increasing attention in the field of wastewater treatment due to its repeatable regeneration and lack of secondary pollutants. Pseudomonas, being among the several bacterial biosorbents, possesses notable benefits in the removal of heavy metals. These advantages encompass its extensive adsorption capacity, broad adaptability, capacity for biotransformation, potential for genetic engineering transformation, cost-effectiveness, and environmentally sustainable nature. The process of bacterial adsorption is a complex phenomenon involving several physical and chemical processes, including adsorption, ion exchange, and surface and contact phenomena. A comprehensive investigation of parameters is necessary in order to develop a mathematical model that effectively measures metal ion recovery and process performance. The aim of this study was to explore the latest advancements in high-tolerance Pseudomonas isolated from natural environments and evaluate its potential as a biological adsorbent. The study investigated the adsorption process of this bacterium, examining key factors such as strain type, contact time, initial metal concentration, and pH that influenced its effectiveness. By utilizing dynamic mathematical models, the research summarized the biosorption process, including adsorption kinetics, equilibrium, and thermodynamics. The findings indicated that Pseudomonas can effectively purify water contaminated with heavy metals and future research will aim to enhance its adsorption performance and expand its application scope for broader environmental purification purposes.
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Affiliation(s)
- Jianhui Zhang
- Department of Bioprocess Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia
| | - Zainura Zainon Noor
- Department of Chemical Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia
- Centre for Environmental Sustainability and Water Security (IPASA), Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia
| | - Nurul Huda Baharuddin
- Department of Chemical Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia
| | - Siti Aminah Setu
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia
| | - Mohd Amir Asyraf Mohd Hamzah
- Department of Bioprocess Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia
| | - Zainul Akmar Zakaria
- Department of Bioprocess Engineering, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Johor, Bahru, Johor, Malaysia.
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Ali JD, Guatame-Garcia A, Jamieson HE, Parsons MB, Leybourne MI, Koch I, Weber KP, Patch DJ, Harrison AL, Vriens B. Occurrence and mobility of thiolated arsenic in legacy mine tailings. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 929:172596. [PMID: 38657821 DOI: 10.1016/j.scitotenv.2024.172596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 04/17/2024] [Accepted: 04/17/2024] [Indexed: 04/26/2024]
Abstract
We studied the occurrence of dissolved thiolated Arsenic (As) in legacy tailings systems in Ontario and Nova Scotia, Canada, and used aqueous and mineralogical speciation analyses to assess its governing geochemical controls. Surface-accessible and inundated tailings in Cobalt, Ontario, contained ∼1 wt-% As mainly hosted in secondary arsenate minerals (erythrite, yukonite, and others) and traces of primary sulfide minerals (cobaltite, gersdorffite and others). Significant fractions of thiolated As (up to 5.9 % of total dissolved As) were detected in aqueous porewater and surface water samples from these sites, comprising mostly monothioarsenate, and smaller amounts of di- and tri-thioarsenates as well as methylated thioarsenates. Tailings at the Goldenville and Montague sites in Nova Scotia contained less (<0.5 wt-%) As, hosted mostly in arsenopyrite and As-bearing pyrite, than the Cobalt sites, but exhibited higher proportions of dissolved thiolated As (up to 17.3 % of total dissolved As, mostly mono- and di-thioarsenate and traces of tri-thioarsenate). Dissolved thiolated As was most abundant in sub-oxic porewaters and inundated tailings samples across the studied sites, and its concentrations were strongly related to the prevailing redox conditions and porewater hydrochemistry, and to a lesser extent, the As-bearing mineralogy. Our novel results demonstrate that thiolated As species play an important role in the cycling of As in mine waste systems and surrounding environments, and should be considered in mine waste management strategies for high-As sites.
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Affiliation(s)
- Jaabir D Ali
- Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada
| | - Adriana Guatame-Garcia
- Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada
| | - Heather E Jamieson
- Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada
| | - Michael B Parsons
- Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada; Geological Survey of Canada, Natural Resources Canada, Dartmouth, Nova Scotia, Canada
| | - Matthew I Leybourne
- Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada; Arthur B. McDonald Astroparticle Physics Research Institute, Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada
| | - Iris Koch
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
| | - Kela P Weber
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
| | - David J Patch
- Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
| | - Anna L Harrison
- Institute of Geological Sciences, University of Bern, Bern 3012, Switzerland
| | - Bas Vriens
- Department of Geological Sciences & Engineering, Queen's University, Kingston, Ontario, Canada.
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Teffera M, Veith AC, Ronnekleiv-Kelly S, Bradfield CA, Nikodemova M, Tussing-Humphreys L, Malecki K. Diverse mechanisms by which chemical pollutant exposure alters gut microbiota metabolism and inflammation. ENVIRONMENT INTERNATIONAL 2024; 190:108805. [PMID: 38901183 DOI: 10.1016/j.envint.2024.108805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 05/28/2024] [Accepted: 06/07/2024] [Indexed: 06/22/2024]
Abstract
The human gut microbiome, the host, and the environment are inextricably linked across the life course with significant health impacts. Consisting of trillions of bacteria, fungi, viruses, and other micro-organisms, microbiota living within our gut are particularly dynamic and responsible for digestion and metabolism of diverse classes of ingested chemical pollutants. Exposure to chemical pollutants not only in early life but throughout growth and into adulthood can alter human hosts' ability to absorb and metabolize xenobiotics, nutrients, and other components critical to health and longevity. Inflammation is a common mechanism underlying multiple environmentally related chronic conditions, including cardiovascular disease, multiple cancer types, and mental health. While growing research supports complex interactions between pollutants and the gut microbiome, significant gaps exist. Few reviews provide descriptions of the complex mechanisms by which chemical pollutants interact with the host microbiome through either direct or indirect pathways to alter disease risk, with a particular focus on inflammatory pathways. This review focuses on examples of several classes of pollutants commonly ingested by humans, including (i) heavy metals, (ii) persistent organic pollutants (POPs), and (iii) nitrates. Digestive enzymes and gut microbes are the first line of absorption and metabolism of these chemicals, and gut microbes have been shown to alter compounds from a less to more toxic state influencing subsequent distribution and excretion. In addition, chemical pollutants may interact with or alter the selection of more harmful and less commensal microbiota, leading to gut dysbiosis, and changes in receptor-mediated signaling pathways that alter the integrity and function of the gut intestinal tract. Arsenic, cadmium, and lead (heavy metals), influence the microbiome directly by altering different classes of bacteria, and subsequently driving inflammation through metabolite production and different signaling pathways (LPS/TLR4 or proteoglycan/TLR2 pathways). POPs can alter gut microbial composition either directly or indirectly depending on their ability to activate key signaling pathways within the intestine (e.g., PCB-126 and AHR). Nitrates and nitrites' effect on the gut and host may depend on their ability to be transformed to secondary and tertiary metabolites by gut bacteria. Future research should continue to support foundational research both in vitro, in vivo, and longitudinal population-based research to better identify opportunities for prevention, gain additional mechanistic insights into the complex interactions between environmental pollutants and the microbiome and support additional translational science.
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Affiliation(s)
- Menna Teffera
- Molecular and Environmental Toxicology, University of Wisconsin-Madison, Madison, WI, US; Biotechnology Center, University of Wisconsin-Madison, Madison, WI, US.
| | - Alex C Veith
- Department of Oncology, University of Wisconsin-Madison, Madison, WI, US.
| | - Sean Ronnekleiv-Kelly
- Molecular and Environmental Toxicology, University of Wisconsin-Madison, Madison, WI, US; Biotechnology Center, University of Wisconsin-Madison, Madison, WI, US; Department of Surgery, University of Wisconsin-Madison, Madison, WI, US.
| | - Christopher A Bradfield
- Molecular and Environmental Toxicology, University of Wisconsin-Madison, Madison, WI, US; Department of Surgery, University of Wisconsin-Madison, Madison, WI, US; Department of Oncology, University of Wisconsin-Madison, Madison, WI, US.
| | - Maria Nikodemova
- College of Public Health and Health Professionals, University of Florida, FL, US.
| | - Lisa Tussing-Humphreys
- Department of Kinesiology and Nutrition, University of Illinois-Chicago, Chicago, IL, US; University of Illinois Cancer Center, University of Illinois-Chicago, Chicago, IL, US.
| | - Kristen Malecki
- Molecular and Environmental Toxicology, University of Wisconsin-Madison, Madison, WI, US; Biotechnology Center, University of Wisconsin-Madison, Madison, WI, US; University of Illinois Cancer Center, University of Illinois-Chicago, Chicago, IL, US; Environmental Occupational Health Sciences, University of Illinois-Chicago, Chicago, IL, US.
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4
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Roy V, Saha BK, Adhikary S, Chaki MG, Sarkar M, Pal A. Isolation, characterization, identification, genomics and analyses of bioaccumulation and biosorption potential of two arsenic-resistant bacteria obtained from natural environments. Sci Rep 2024; 14:5716. [PMID: 38459150 PMCID: PMC10924095 DOI: 10.1038/s41598-024-56082-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 03/01/2024] [Indexed: 03/10/2024] Open
Abstract
Arsenic (As) is a significant contaminant whose unrestrained entrance into different ecosystems has created global concern. At the cellular level, As forms unsteady intermediates with genetic materials and perturbs different metabolic processes and proper folding of proteins. This study was the first in this region to explore, isolate, screen systematically, and intensively characterize potent As-tolerant bacterial strains from natural environments near Raiganj town of Uttar Dinajpur, West Bengal. In this study, two potent Gram-negative bacterial strains with high tolerance to the poisonous form of As, i.e., As(III) and As(V), were obtained. Both the isolates were identified using biochemical tests and 16S rRNA gene sequencing. These bacteria oxidized toxic As(III) into less poisonous As(V) and depicted tolerance towards other heavy metals. Comparative metabolic profiling of the isolates in control and As-exposed conditions through Fourier-transform infrared spectroscopy showed metabolic adjustments to cope with As toxicity. The metal removal efficiency of the isolates at different pH showed that one of the isolates, KG1D, could remove As efficiently irrespective of changes in the media pH. In contrast, the efficiency of metal removal by PF14 was largely pH-dependent. The cell mass of both the isolates was also found to favourably adsorb As(III). Whole genome sequence analysis of the isolates depicted the presence of the arsRBC genes of the arsenic operon conferring resistance to As. Owing to their As(III) oxidizing potential, high As bioaccumulation, and tolerance to other heavy metals, these bacteria could be used to bioremediate and reclaim As-contaminated sites.
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Affiliation(s)
- Vivek Roy
- Microbiology and Computational Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, 733134, India
| | - Barnan Kumar Saha
- Microbiology and Computational Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, 733134, India
| | - Samarpita Adhikary
- Microbiology and Computational Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, 733134, India
| | - Madhumita G Chaki
- Microbiology and Computational Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, 733134, India
| | - Monalisha Sarkar
- Microbiology and Computational Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, 733134, India
| | - Ayon Pal
- Microbiology and Computational Biology Laboratory, Department of Botany, Raiganj University, Raiganj, West Bengal, 733134, India.
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Hassan Z, Westerhoff HV. Arsenic Contamination of Groundwater Is Determined by Complex Interactions between Various Chemical and Biological Processes. TOXICS 2024; 12:89. [PMID: 38276724 PMCID: PMC11154318 DOI: 10.3390/toxics12010089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/03/2024] [Accepted: 01/05/2024] [Indexed: 01/27/2024]
Abstract
At a great many locations worldwide, the safety of drinking water is not assured due to pollution with arsenic. Arsenic toxicity is a matter of both systems chemistry and systems biology: it is determined by complex and intertwined networks of chemical reactions in the inanimate environment, in microbes in that environment, and in the human body. We here review what is known about these networks and their interconnections. We then discuss how consideration of the systems aspects of arsenic levels in groundwater may open up new avenues towards the realization of safer drinking water. Along such avenues, both geochemical and microbiological conditions can optimize groundwater microbial ecology vis-à-vis reduced arsenic toxicity.
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Affiliation(s)
- Zahid Hassan
- Department of Molecular Cell Biology, A-Life, Faculty of Science, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands;
- Department of Genetic Engineering and Biotechnology, Jagannath University, Dhaka 1100, Bangladesh
| | - Hans V. Westerhoff
- Department of Molecular Cell Biology, A-Life, Faculty of Science, Vrije Universiteit Amsterdam, 1081 HV Amsterdam, The Netherlands;
- School of Biological Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M13 9PT, UK
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 XH Amsterdam, The Netherlands
- Stellenbosch Institute of Advanced Studies (STIAS), Wallenberg Research Centre at Stellenbosch University, Stellenbosch 7600, South Africa
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Cantillo-González A, Anguita J, Rojas C, Vargas IT. Winogradsky Bioelectrochemical System as a Novel Strategy to Enrich Electrochemically Active Microorganisms from Arsenic-Rich Sediments. MICROMACHINES 2022; 13:1953. [PMID: 36422381 PMCID: PMC9692521 DOI: 10.3390/mi13111953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/12/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
Bioelectrochemical systems (BESs) have been extensively studied for treatment and remediation. However, BESs have the potential to be used for the enrichment of microorganisms that could replace their natural electron donor or acceptor for an electrode. In this study, Winogradsky BES columns with As-rich sediments extracted from an Andean watershed were used as a strategy to enrich lithotrophic electrochemically active microorganisms (EAMs) on electrodes (i.e., cathodes). After 15 months, Winogradsky BESs registered power densities up to 650 μWcm-2. Scanning electron microscopy and linear sweep voltammetry confirmed microbial growth and electrochemical activity on cathodes. Pyrosequencing evidenced differences in bacterial composition between sediments from the field and cathodic biofilms. Six EAMs from genera Herbaspirillum, Ancylobacter, Rhodococcus, Methylobacterium, Sphingomonas, and Pseudomonas were isolated from cathodes using a lithoautotrophic As oxidizers culture medium. These results suggest that the tested Winogradsky BES columns result in an enrichment of electrochemically active As-oxidizing microorganisms. A bioelectrochemical boost of centenarian enrichment approaches, such as the Winogradsky column, represents a promising strategy for prospecting new EAMs linked with the biogeochemical cycles of different metals and metalloids.
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Affiliation(s)
- Angela Cantillo-González
- Departmento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Centro de Desarrollo Urbano Sustentable (CEDEUS), Santiago 6640064, Chile
| | - Javiera Anguita
- Departmento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Claudia Rojas
- Laboratory of Soil Microbial Ecology and Biogeochemistry (LEMiBiS), Institute of Agri-Food, Animal and Environmental Sciences (ICA3), Universidad de O’Higgins, San Fernando 3070000, Chile
- Center of Applied Ecology and Sustainability (CAPES), Santiago 8331150, Chile
| | - Ignacio T. Vargas
- Departmento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
- Centro de Desarrollo Urbano Sustentable (CEDEUS), Santiago 6640064, Chile
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7
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Cai X, Zhang Z, Yin N, Lu W, Du H, Yang M, Cui L, Chen S, Cui Y. Controlling microbial arsenite oxidation and mobilization in arsenite-adsorbed iron minerals: The Influence of pH conditions and mineralogical composition. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128778. [PMID: 35358812 DOI: 10.1016/j.jhazmat.2022.128778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/15/2022] [Accepted: 03/22/2022] [Indexed: 06/14/2023]
Abstract
The oxidation of aqueous arsenite (As(III)) by As(III)-oxidizing bacteria is known to attenuate the mobilization and toxicity of arsenic, and is regarded as potential method for As(III)-pollution remediation. However, during the interactions between As(III)-oxidizing bacteria and different As(III)-adsorbed soil Fe-minerals, the oxidation and partitioning of solid-phase As(III), as well as the controlling mechanisms, remain unclear. In this study, we therefore incubated three As(III)-adsorbed Fe-minerals with a typical As(III)-oxidizing bacteria (Pseudomonas sp. HN-1) at different pH conditions. After microbial oxidation, the percentage of arsenate (As(V)) was significantly higher at pH 7 (15-94%) and 9 (12-89%) than at pH 4 (6-50%) in all Fe-minerals. Incubation of As(III)-oxidizing bacteria promoted As-immobilization under acidic-conditions but As-mobilization under alkaline-conditions. Arsenic-X-ray adsorption spectroscopy results showed that solid-phase As(V) fraction in goethite, hematite and magnetite was 27-64%, 5-12% and 50-91%, respectively. Compared with the corner-sharing As(III)-adsorption complexes formed on magnetite, the edge-sharing complexes on hematite were significantly more stable towards microbial-oxidation. Additionally, the strong adhesion between strain HN-1 and hematite probably limit bacterial-activity and mobility, thereby inhibiting microbial As(III)-oxidation. Our findings elucidate the controlling mechanisms of microbial As(III)-oxidation in different As(III)-adsorbed Fe-minerals and demonstrate strain HN-1 is an excellent candidate for As(III)-remediation in soils containing goethite and magnetite.
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Affiliation(s)
- Xiaolin Cai
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Zhennan Zhang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Naiyi Yin
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Wenyi Lu
- Binzhou Institute of Technology, Binzhou, Shandong Province 256606, People's Republic of China
| | - Huili Du
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Mei Yang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Liwei Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
| | - Shibao Chen
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, People's Republic of China.
| | - Yanshan Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China; Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
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8
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Trivedi CB, Keuschnig C, Larose C, Rissi DV, Mourot R, Bradley JA, Winkel M, Benning LG. DNA/RNA Preservation in Glacial Snow and Ice Samples. Front Microbiol 2022; 13:894893. [PMID: 35677909 PMCID: PMC9168539 DOI: 10.3389/fmicb.2022.894893] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
The preservation of nucleic acids for high-throughput sequencing is an ongoing challenge for field scientists. In particular, samples that are low biomass, or that have to be collected and preserved in logistically challenging environments (such as remote sites or during long sampling campaigns) can pose exceptional difficulties. With this work, we compare and assess the effectiveness of three preservation methods for DNA and RNA extracted from microbial communities of glacial snow and ice samples. Snow and ice samples were melted and filtered upon collection in Iceland, and filters were preserved using: (i) liquid nitrogen flash freezing, (ii) storage in RNAlater, or (iii) storage in Zymo DNA/RNA Shield. Comparative statistics covering nucleic acid recovery, sequencing library preparation, genome assembly, and taxonomic diversity were used to determine best practices for the preservation of DNA and RNA samples from these environments. Our results reveal that microbial community composition based on DNA was comparable at the class level across preservation types. Based on extracted RNA, the taxonomic composition of the active community was primarily driven by the filtered sample volume (i.e., biomass content). In low biomass samples (where <200 ml of sample volume was filtered) the taxonomic and functional signatures trend toward the composition of the control samples, while in samples where a larger volume (more biomass) was filtered our data showed comparable results independent of preservation type. Based on all comparisons our data suggests that flash freezing of filters containing low biomass is the preferred method for preserving DNA and RNA (notwithstanding the difficulties of accessing liquid nitrogen in remote glacial field sites). Generally, RNAlater and Zymo DNA/RNA Shield solutions work comparably well, especially for DNA from high biomass samples, but Zymo DNA/RNA Shield is favored due to its higher yield of preserved RNA. Biomass quantity from snow and ice samples appears to be the most important factor in regards to the collection and preservation of samples from glacial environments.
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Affiliation(s)
- Christopher B Trivedi
- Interface Geochemistry, GFZ German Research Centre for Geosciences, Potsdam, Germany
| | | | - Catherine Larose
- Environmental Microbial Genomics, Université de Lyon, Ecully Cedex, France
| | | | - Rey Mourot
- Interface Geochemistry, GFZ German Research Centre for Geosciences, Potsdam, Germany.,Department of Earth Sciences, Freie Universität Berlin, Berlin, Germany
| | - James A Bradley
- Interface Geochemistry, GFZ German Research Centre for Geosciences, Potsdam, Germany.,School of Geography, Queen Mary University of London, London, United Kingdom
| | - Matthias Winkel
- Interface Geochemistry, GFZ German Research Centre for Geosciences, Potsdam, Germany
| | - Liane G Benning
- Interface Geochemistry, GFZ German Research Centre for Geosciences, Potsdam, Germany.,Department of Earth Sciences, Freie Universität Berlin, Berlin, Germany
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9
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Fernández I, de Los Ríos-Escalante P, Valenzuela A, Aguayo P, Smith CT, García-Cancino A, Sánchez-Alonso K, Oyarzún C, Campos VL. Gastrointestinal Microbiota and Parasite-Fauna of Wild Dissostichus eleginoides Smitt, 1898 Captured at the South-Central Coast of Chile. Microorganisms 2021; 9:microorganisms9122522. [PMID: 34946125 PMCID: PMC8706219 DOI: 10.3390/microorganisms9122522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 12/02/2022] Open
Abstract
Dissotichus eleginoides has a discontinuous circumpolar geographic distribution restricted to mountains and platforms, mainly in Subantarctic and Antarctic waters of the southern hemisphere, including the Southeast Pacific, Atlantic and Indian oceans and in areas surrounding the peninsular platforms of subantarctic islands. The aim of this work was to determine and characterize the gastrointestinal parasitic and microbial fauna of specimens of D. eleginoides captured in waters of the south-central zone of Chile. The magnitude of parasitism in D. eleginoides captured in waters of the south-central zone of Chile is variable, and the parasite richness is different from that reported in specimens from subantarctic environments. Next-generation sequencing (NGS) of the microbial community associated to intestine showed a high diversity, where Proteobacteria, Firmicutes, and Bacteriodetes were the dominant phyla. However, both parasitic and microbial structures can vary between fish from different geographic regions
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Affiliation(s)
- Italo Fernández
- Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción 4070386, Chile; (I.F.); (C.T.S.); (A.G.-C.); (K.S.-A.)
| | - Patricio de Los Ríos-Escalante
- Departamento de Ciencias Biológicas y Químicas, Facultad de Recursos Naturales, Universidad Católica de Temuco, Temuco 4780000, Chile;
- Núcleo de Estudios Ambientales, Universidad Católica de Temuco, Temuco 4780000, Chile
| | - Ariel Valenzuela
- Laboratorio de Piscicultura y Patología Acuática, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción 4070386, Chile; (A.V.); (C.O.)
| | - Paulina Aguayo
- Institute of Natural Resources, Faculty of Veterinary Medicine and Agronomy, Universidad de Las Américas, Sede Concepción, Chacabuco 539, Concepción 3349001, Chile;
- EULA Environmental Sciences Center, Faculty of Environmental Sciences, Universidad de Concepción, Concepción 4070386, Chile
| | - Carlos T. Smith
- Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción 4070386, Chile; (I.F.); (C.T.S.); (A.G.-C.); (K.S.-A.)
| | - Apolinaria García-Cancino
- Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción 4070386, Chile; (I.F.); (C.T.S.); (A.G.-C.); (K.S.-A.)
| | - Kimberly Sánchez-Alonso
- Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción 4070386, Chile; (I.F.); (C.T.S.); (A.G.-C.); (K.S.-A.)
| | - Ciro Oyarzún
- Laboratorio de Piscicultura y Patología Acuática, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción 4070386, Chile; (A.V.); (C.O.)
| | - Víctor L. Campos
- Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción 4070386, Chile; (I.F.); (C.T.S.); (A.G.-C.); (K.S.-A.)
- Correspondence:
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