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Establish Axenic Cultures of Armored and Unarmored Marine
www.nature.com/scientificreports OPEN Establish axenic cultures of armored and unarmored marine dinofagellate species using density separation, antibacterial treatments and stepwise dilution selection Thomas Chun‑Hung Lee1, Ping‑Lung Chan1, Nora Fung‑Yee Tam2, Steven Jing‑Liang Xu1 & Fred Wang‑Fat Lee1* Academic research on dinofagellate, the primary causative agent of harmful algal blooms (HABs), is often hindered by the coexistence with bacteria in laboratory cultures. The development of axenic dinofagellate cultures is challenging and no universally accepted method suit for diferent algal species. In this study, we demonstrated a promising approach combined density gradient centrifugation, antibiotic treatment, and serial dilution to generate axenic cultures of Karenia mikimotoi (KMHK). Density gradient centrifugation and antibiotic treatments reduced the bacterial population from 5.79 ± 0.22 log10 CFU/mL to 1.13 ± 0.07 log10 CFU/mL. The treated KMHK cells were rendered axenic through serial dilution, and algal cells in diferent dilutions with the absence of unculturable bacteria were isolated. Axenicity was verifed through bacterial (16S) and fungal internal transcribed spacer (ITS) sequencing and DAPI epifuorescence microscopy. Axenic KMHK culture regrew from 1000 to 9408 cells/mL in 7 days, comparable with a normal culture. The established methodology was validated with other dinofagellate, Alexandrium tamarense (AT6) and successfully obtained the axenic culture. The axenic status of both cultures was maintained more than 30 generations without antibiotics. This efcient, straightforward and inexpensive approach suits for both armored and unarmored dinofagellate species. Te frequency of harmful algal blooms (HABs) has been increasing worldwide over the past decades, which have major economic efects on fsh farming, the shellfsh industry, as well as human health 1,2. -
Shedding Light on Microbial Dark Matter with a Universal Language
bioRxiv preprint doi: https://doi.org/10.1101/2020.12.23.424215; this version posted December 26, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. 1 Shedding Light on Microbial Dark Matter with A 2 Universal Language of Life 1,* 2 3 2,* 3 Hoarfrost A , Aptekmann, A , Farfañuk, G , Bromberg Y 4 1 Department of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08873, USA 5 2 Department of Biochemistry and Microbiology, 76 Lipman Dr, Rutgers University, New Brunswick, NJ 08901, USA 6 3 Department of Biological Chemistry, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina 7 8 * Corresponding author: [email protected]; [email protected] 9 Running Title: LookingGlass: a universal language of life 10 11 Abstract 12 The majority of microbial genomes have yet to be cultured, and most proteins 13 predicted from microbial genomes or sequenced from the environment cannot be 14 functionally annotated. As a result, current computational approaches to describe 15 microbial systems rely on incomplete reference databases that cannot adequately 16 capture the full functional diversity of the microbial tree of life, limiting our ability to 17 model high-level features of biological sequences. The scientific community needs a 18 means to capture the functionally and evolutionarily relevant features underlying 19 biology, independent of our incomplete reference databases. Such a model can form 20 the basis for transfer learning tasks, enabling downstream applications in 21 environmental microbiology, medicine, and bioengineering. -
S41564-017-0083-5.Pdf
CORRECTION https://doi.org/10.1038/s41564-017-0083-5 Author Correction: Recovery of nearly 8,000 metagenome-assembled genomes substantially expands the tree of life Donovan H. Parks, Christian Rinke, Maria Chuvochina, Pierre-Alain Chaumeil, Ben J. Woodcroft, Paul N. Evans, Philip Hugenholtz* and Gene W. Tyson* Correction to: Nature Microbiology https://doi.org/10.1038/s41564-017-0012-7 (2017); published online 11 September 2017. In the original version of this Article, the authors stated that the archaeal phylum Parvarchaeota was previously represented by only two single-cell genomes (ARMAN-4_'5-way FS' and ARMAN-5_'5-way FS'). However, these are in fact unpublished, low-quality metage- nome-assembled genomes (MAGs) obtained from Richmond Mine, California. In addition, the authors overlooked two higher-quality published Parvarchaeota MAGs from the same habitat, ARMAN-4 (ADCE00000000) and ARMAN-5 (ADHF00000000) (B. J. Baker et al., Proc. Natl Acad. Sci. USA 107, 8806–8811; 2010). The ARMAN-4 and ARMAN-5 MAGs are estimated to be 68.0% and 76.7% complete with 3.3% and 5.6% contamination, respectively, based on the archaeal-specific marker sets of CheckM. The 11 Parvarchaeota genomes identified in our study were obtained from different Richmond Mine metagenomes, but are highly similar to the ARMAN-4 (ANI of ~99.7%) and ARMAN-5 (ANI of ~99.6%) MAGs. The highest-quality uncultivated bacteria and archaea (UBA) MAGs with similarity to ARMAN-4 and ARMAN-5 are 82.5% and 83.3% complete with 0.9% and 1.9% contamination, respectively. The Parvarchaeota rep- resents only 0.23% of the archaeal genome tree and addition of the ARMAN-4 and ARMAN-5 MAGs do not change the conclusions of this Article, but do impact the phylogenetic gain for this phylum. -
Culture Under Normoxic Conditions and Enhanced Virulence of Phase II Coxiella
bioRxiv preprint doi: https://doi.org/10.1101/747220; this version posted August 28, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Culture under normoxic conditions and enhanced virulence of phase II Coxiella 2 burnetii transformed with a RSF1010-based shuttle vector 3 4 Shengdong Luo1,2#, Zemin He2#, Zhihui Sun2, Yonghui Yu2, Yongqiang Jiang2, Yigang 5 Tong1*, Lihua Song1* 6 7 1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, 8 Beijing University of Chemical Technology, Beijing, 100029, China; 2State Key 9 Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and 10 Epidemiology, Beijing 100071, China 11 12 #These authors contributed equally. 13 *Corresponding author. Lihua Song ([email protected]); Yigang Tong 14 ([email protected]) 15 16 Keywords: Coxiella burnetii, microaerobic, normoxia, hypoxia, splenomegaly 17 18 Running title: Normoxic growth of Coxiella burnetii 19 bioRxiv preprint doi: https://doi.org/10.1101/747220; this version posted August 28, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 20 Abstract 21 Coxiella burnetii is a Gram-negative, facultative intracellular microorganism that can 22 cause acute or chronic Q fever in human. It was recognized as an obligate intracellular 23 organism until the revolutionary design of an axenic cystine culture medium (ACCM). -
Resilience of Microbial Communities After Hydrogen Peroxide Treatment of a Eutrophic Lake to Suppress Harmful Cyanobacterial Blooms
microorganisms Article Resilience of Microbial Communities after Hydrogen Peroxide Treatment of a Eutrophic Lake to Suppress Harmful Cyanobacterial Blooms Tim Piel 1,†, Giovanni Sandrini 1,†,‡, Gerard Muyzer 1 , Corina P. D. Brussaard 1,2 , Pieter C. Slot 1, Maria J. van Herk 1, Jef Huisman 1 and Petra M. Visser 1,* 1 Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, 1090 GE Amsterdam, The Netherlands; [email protected] (T.P.); [email protected] (G.S.); [email protected] (G.M.); [email protected] (C.P.D.B.); [email protected] (P.C.S.); [email protected] (M.J.v.H.); [email protected] (J.H.) 2 Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherland Institute for Sea Research, 1790 AB Den Burg, The Netherlands * Correspondence: [email protected]; Tel.: +31-20-5257073 † These authors have contributed equally to this work. ‡ Current address: Department of Technology & Sources, Evides Water Company, 3006 AL Rotterdam, The Netherlands. Abstract: Applying low concentrations of hydrogen peroxide (H2O2) to lakes is an emerging method to mitigate harmful cyanobacterial blooms. While cyanobacteria are very sensitive to H2O2, little Citation: Piel, T.; Sandrini, G.; is known about the impacts of these H2O2 treatments on other members of the microbial com- Muyzer, G.; Brussaard, C.P.D.; Slot, munity. In this study, we investigated changes in microbial community composition during two P.C.; van Herk, M.J.; Huisman, J.; −1 lake treatments with low H2O2 concentrations (target: 2.5 mg L ) and in two series of controlled Visser, P.M. -
Actinobacterial Rare Biospheres and Dark Matter Revealed in Habitats of the Chilean Atacama Desert
Idris H, Goodfellow M, Sanderson R, Asenjo JA, Bull AT. Actinobacterial Rare Biospheres and Dark Matter Revealed in Habitats of the Chilean Atacama Desert. Scientific Reports 2017, 7(1), 8373. Copyright: © The Author(s) 2017. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. DOI link to article: https://doi.org/10.1038/s41598-017-08937-4 Date deposited: 18/10/2017 This work is licensed under a Creative Commons Attribution 4.0 International License Newcastle University ePrints - eprint.ncl.ac.uk www.nature.com/scientificreports OPEN Actinobacterial Rare Biospheres and Dark Matter Revealed in Habitats of the Chilean Atacama Received: 13 April 2017 Accepted: 4 July 2017 Desert Published: xx xx xxxx Hamidah Idris1, Michael Goodfellow1, Roy Sanderson1, Juan A. Asenjo2 & Alan T. Bull3 The Atacama Desert is the most extreme non-polar biome on Earth, the core region of which is considered to represent the dry limit for life and to be an analogue for Martian soils. -
UC Berkeley Electronic Theses and Dissertations
UC Berkeley UC Berkeley Electronic Theses and Dissertations Title Interactions of Microbes in Communities Permalink https://escholarship.org/uc/item/2hg5h7k6 Author Sczesnak, Andrew Publication Date 2018 Peer reviewed|Thesis/dissertation eScholarship.org Powered by the California Digital Library University of California Interactions of Microbes in Communities By Andrew Sczesnak A dissertation submitted in partial satisfaction of the requirements for the degree of Joint Doctor of Philosophy with University of California, San Francisco in Bioengineering in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Adam P. Arkin, Chair Professor Matthew Traxler Professor Michael Fischbach Fall 2018 Abstract Interactions of Microbes in Communities By Andrew Sczesnak Joint Doctor of Philosophy with University of California, San Francisco in Bioengineering University of California, Berkeley Professor Adam P. Arkin, Chair Groups of microorganisms sharing an environment (microbial communities) are ubiquitous in nature. Microbial communities provide essential ecosystem services to other life on Earth by e.g., participating in global biogeochemical processes or interacting with a host’s immune system. Such microbes compete for scarce resources, modify an environment for their own purposes, actively war, and occasionally cooperate. Though numerous studies have surveyed the diversity of microbial life in different environments, few have determined the ways in which members of microbial communities interact with one another. Understanding the ways and means by which microbes interact is essential if we are to understand how microbial communities form, persist, and change over time. Knowledge of these processes will allow us to rationally design microbial communities to perform useful functions and predict how our actions might shift the balance of microbes in a community, and thus affect its function. -
Novel Insights Into the Thaumarchaeota in the Deepest Oceans: Their Metabolism and Potential Adaptation Mechanisms
Zhong et al. Microbiome (2020) 8:78 https://doi.org/10.1186/s40168-020-00849-2 RESEARCH Open Access Novel insights into the Thaumarchaeota in the deepest oceans: their metabolism and potential adaptation mechanisms Haohui Zhong1,2, Laura Lehtovirta-Morley3, Jiwen Liu1,2, Yanfen Zheng1, Heyu Lin1, Delei Song1, Jonathan D. Todd3, Jiwei Tian4 and Xiao-Hua Zhang1,2,5* Abstract Background: Marine Group I (MGI) Thaumarchaeota, which play key roles in the global biogeochemical cycling of nitrogen and carbon (ammonia oxidizers), thrive in the aphotic deep sea with massive populations. Recent studies have revealed that MGI Thaumarchaeota were present in the deepest part of oceans—the hadal zone (depth > 6000 m, consisting almost entirely of trenches), with the predominant phylotype being distinct from that in the “shallower” deep sea. However, little is known about the metabolism and distribution of these ammonia oxidizers in the hadal water. Results: In this study, metagenomic data were obtained from 0–10,500 m deep seawater samples from the Mariana Trench. The distribution patterns of Thaumarchaeota derived from metagenomics and 16S rRNA gene sequencing were in line with that reported in previous studies: abundance of Thaumarchaeota peaked in bathypelagic zone (depth 1000–4000 m) and the predominant clade shifted in the hadal zone. Several metagenome-assembled thaumarchaeotal genomes were recovered, including a near-complete one representing the dominant hadal phylotype of MGI. Using comparative genomics, we predict that unexpected genes involved in bioenergetics, including two distinct ATP synthase genes (predicted to be coupled with H+ and Na+ respectively), and genes horizontally transferred from other extremophiles, such as those encoding putative di-myo-inositol-phosphate (DIP) synthases, might significantly contribute to the success of this hadal clade under the extreme condition. -
Dissertation Implementing Organic Amendments To
DISSERTATION IMPLEMENTING ORGANIC AMENDMENTS TO ENHANCE MAIZE YIELD, SOIL MOISTURE, AND MICROBIAL NUTRIENT CYCLING IN TEMPERATE AGRICULTURE Submitted by Erika J. Foster Graduate Degree Program in Ecology In partial fulfillment of the requirements For the Degree of Doctor of Philosophy Colorado State University Fort Collins, Colorado Summer 2018 Doctoral Committee: Advisor: M. Francesca Cotrufo Louise Comas Charles Rhoades Matthew D. Wallenstein Copyright by Erika J. Foster 2018 All Rights Reserved i ABSTRACT IMPLEMENTING ORGANIC AMENDMENTS TO ENHANCE MAIZE YIELD, SOIL MOISTURE, AND MICROBIAL NUTRIENT CYCLING IN TEMPERATE AGRICULTURE To sustain agricultural production into the future, management should enhance natural biogeochemical cycling within the soil. Strategies to increase yield while reducing chemical fertilizer inputs and irrigation require robust research and development before widespread implementation. Current innovations in crop production use amendments such as manure and biochar charcoal to increase soil organic matter and improve soil structure, water, and nutrient content. Organic amendments also provide substrate and habitat for soil microorganisms that can play a key role cycling nutrients, improving nutrient availability for crops. Additional plant growth promoting bacteria can be incorporated into the soil as inocula to enhance soil nutrient cycling through mechanisms like phosphorus solubilization. Since microbial inoculation is highly effective under drought conditions, this technique pairs well in agricultural systems using limited irrigation to save water, particularly in semi-arid regions where climate change and population growth exacerbate water scarcity. The research in this dissertation examines synergistic techniques to reduce irrigation inputs, while building soil organic matter, and promoting natural microbial function to increase crop available nutrients. The research was conducted on conventional irrigated maize systems at the Agricultural Research Development and Education Center north of Fort Collins, CO. -
Improved Protocol for the Preparation of Tetraselmis Suecica Axenic
36 The Open Biotechnology Journal, 2010, 4, 36-46 Open Access Improved Protocol for the Preparation of Tetraselmis suecica Axenic Culture and Adaptation to Heterotrophic Cultivation Mojtaba Azma1, Rosfarizan Mohamad1, Raha Abdul Rahim2 and Arbakariya B. Ariff*,1 1Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia 2Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia Abstract: The effectiveness of various physical and chemical methods for the removal of contaminants from the microal- gae, Tetraselmis suecica, culture was investigated. The information obtained was used as the basis for the development of improved protocol for the preparation of axenic culture to be adapted to heterotrophic cultivation. Repeated centrifugation and rinsing effectively removed the free bacterial contaminants from the microalgae culture while sonication helped to loosen up the tightly attached bacterial contaminants on the microalgae cells. Removal of bacterial spores was accom- plished using a mixture of two antibiotics, 5 mg/mL vancomycine and 10 mg/mL neomycine. Walne medium formulation with natural seawater was preferred for the enhancement of growth of T. suecica. Adaptation of growth from photoautot- rophic to heterotrophic conditions was achieved by the repeated cultivation of photoautotrophic culture with sequential reduction in illumination time, and finally the culture was inoculated into the medium containing 10 g/L glucose, incu- bated in total darkness to obtain heterotrophic cells. Changes in the morphology and composition of T. suecica cells dur- ing the adaptation from photoautotrophic to heterotrophic condition, as examined under Transmission Electron Micro- scope, were also reported. -
And Femtogram-Input DNA Libraries for Microscale Metagenomics
Validation of picogram- and femtogram-input DNA libraries for microscale metagenomics Christian Rinke1, Serene Low1, Ben J. Woodcroft1, Jean-Baptiste Raina2, Adam Skarshewski1, Xuyen H. Le1, Margaret K. Butler1, Roman Stocker3, Justin Seymour2, Gene W. Tyson1,4 and Philip Hugenholtz1,5 1 Australian Centre for Ecogenomics/School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD, Australia 2 Climate Change Cluster, University of Technology Sydney, Sydney, New South Wales, Australia 3 Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zurich, Switzerland 4 Advanced Water Management Centre, University of Queensland, Brisbane, QLD, Australia 5 Institute for Molecular Bioscience, University of Queensland, Brisbane, QLD, Australia ABSTRACT High-throughput sequencing libraries are typically limited by the requirement for nanograms to micrograms of input DNA. This bottleneck impedes the microscale analysis of ecosystems and the exploration of low biomass samples. Current methods for amplifying environmental DNA to bypass this bottleneck introduce considerable bias into metagenomic profiles. Here we describe and validate a simple modification of the Illumina Nextera XT DNA library preparation kit which allows creation of shotgun libraries from sub-nanogram amounts of input DNA. Community composition was reproducible down to 100 fg of input DNA based on analysis of a mock community comprising 54 phylogenetically diverse Bacteria and Archaea. The Submitted 14 June 2016 main technical issues with the low input libraries were a greater potential for Accepted 24 August 2016 Published 22 September 2016 contamination, limited DNA complexity which has a direct effect on assembly and binning, and an associated higher percentage of read duplicates. We recommend a Corresponding authors Christian Rinke, lower limit of 1 pg (∼100–1,000 microbial cells) to ensure community composition [email protected] fidelity, and the inclusion of negative controls to identify reagent-specific Philip Hugenholtz, contaminants. -
Unexpected Host Dependency of Antarctic Nanohaloarchaeota
Unexpected host dependency of Antarctic Nanohaloarchaeota Joshua N. Hamma, Susanne Erdmanna,1, Emiley A. Eloe-Fadroshb, Allegra Angelonia, Ling Zhongc, Christopher Brownleed, Timothy J. Williamsa, Kirston Bartone, Shaun Carswelle, Martin A. Smithe,f, Sarah Brazendalea,2, Alyce M. Hancocka,3, Michelle A. Allena, Mark J. Rafteryc, and Ricardo Cavicchiolia,4 aSchool of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia; bDepartment of Energy, Joint Genome Institute, Walnut Creek, CA 94598; cBioanalytical Mass Spectrometry Facility, University of New South Wales, Sydney, NSW 2052, Australia; dBiological Resources Imaging Laboratory, University of New South Wales, Sydney, NSW 2052, Australia; eKinghorn Centre for Clinical Genomics, Garvan Institute of Medical Research, Darlinghurst, NSW 2010, Australia; and fSt. Vincent’s Clinical School, University of New South Wales, Sydney, Darlinghurst, NSW 2010, Australia Edited by Norman R. Pace, University of Colorado Boulder, Boulder, CO, and approved June 5, 2019 (received for review March 25, 2019) In hypersaline environments, Nanohaloarchaeota (Diapherotrites, acidilobi (<0.3-μmdiameter,∼0.6 Mb) (11), Candidatus Parvarchaeota, Aenigmarchaeota, Nanoarchaeota, Nanohaloarch- Parvarchaeum acidophilus (0.6-μm diameter, <1 Mb) (12), and aeota [DPANN] superphylum) are thought to be free-living Candidatus Mancarchaeum acidophilum (∼1-μmdiameter,∼1Mb) microorganisms. We report cultivation of 2 strains of Antarctic (13), have all been shown to possess small cell and genome sizes; Nanohaloarchaeota and show that they require the haloarchaeon these are traits that have been proposed to be typical of all Halorubrum lacusprofundi for growth. By performing growth us- DPANN phyla (3). Due to their reduced genomic capacity, these ing enrichments and fluorescence-activated cell sorting, we dem- – onstrated successful cultivation of Candidatus Nanohaloarchaeum Nanoarchaeota and Pavarchaeota require cell cell contact with – antarcticus, purification of Ca.