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Wang Z, Zhang Q, Zhang H, Lu Y. Roles of alcohol dehydrogenase 1 in the biological activities of Candida albicans. Crit Rev Microbiol 2024:1-15. [PMID: 38916139 DOI: 10.1080/1040841x.2024.2371510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 06/04/2024] [Indexed: 06/26/2024]
Abstract
Candida albicans stands as the foremost prevalent human commensal pathogen and a significant contributor to nosocomial fungal infections. In the metabolism of C. albicans, alcohol dehydrogenase 1 (Adh1) is one of the important enzymes that converts acetaldehyde produced by pyruvate decarboxylation into ethanol at the end of glycolysis. Leveraging the foundational processes of alcoholic fermentation, Adh1 plays an active role in multiple biological phenomena, including biofilm formation, interactions between different species, the development of drug resistance, and the potential initiation of gastrointestinal cancer. Additionally, Adh1 within C. albicans has demonstrated associations with regulating the cell cycle, stress responses, and various intracellular states. Furthermore, Adh1 is extracellularly localized on the cell wall surface, where it plays roles in processes such as tissue invasion and host immune responses. Drawing from an analysis of ADH1 gene structure, expression patterns, and fundamental functions, this review elucidates the intricate connections between Adh1 and various biological processes within C. albicans, underscoring its potential implications for the prevention, diagnosis, and treatment of candidiasis.
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Affiliation(s)
- Ziqi Wang
- School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
| | - Qi Zhang
- School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
| | - Haoying Zhang
- School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
| | - Yuanyuan Lu
- School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
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2
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Gnaien M, Maufrais C, Rebai Y, Kallel A, Ma L, Hamouda S, Khalsi F, Meftah K, Smaoui H, Khemiri M, Hadj Fredj S, Bachellier-Bassi S, Najjar I, Messaoud T, Boussetta K, Kallel K, Mardassi H, d’Enfert C, Bougnoux ME, Znaidi S. A gain-of-function mutation in zinc cluster transcription factor Rob1 drives Candida albicans adaptive growth in the cystic fibrosis lung environment. PLoS Pathog 2024; 20:e1012154. [PMID: 38603707 PMCID: PMC11037546 DOI: 10.1371/journal.ppat.1012154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 04/23/2024] [Accepted: 03/26/2024] [Indexed: 04/13/2024] Open
Abstract
Candida albicans chronically colonizes the respiratory tract of patients with Cystic Fibrosis (CF). It competes with CF-associated pathogens (e.g. Pseudomonas aeruginosa) and contributes to disease severity. We hypothesize that C. albicans undergoes specific adaptation mechanisms that explain its persistence in the CF lung environment. To identify the underlying genetic and phenotypic determinants, we serially recovered 146 C. albicans clinical isolates over a period of 30 months from the sputum of 25 antifungal-naive CF patients. Multilocus sequence typing analyses revealed that most patients were individually colonized with genetically close strains, facilitating comparative analyses between serial isolates. We strikingly observed differential ability to filament and form monospecies and dual-species biofilms with P. aeruginosa among 18 serial isolates sharing the same diploid sequence type, recovered within one year from a pediatric patient. Whole genome sequencing revealed that their genomes were highly heterozygous and similar to each other, displaying a highly clonal subpopulation structure. Data mining identified 34 non-synonymous heterozygous SNPs in 19 open reading frames differentiating the hyperfilamentous and strong biofilm-former strains from the remaining isolates. Among these, we detected a glycine-to-glutamate substitution at position 299 (G299E) in the deduced amino acid sequence of the zinc cluster transcription factor ROB1 (ROB1G299E), encoding a major regulator of filamentous growth and biofilm formation. Introduction of the G299E heterozygous mutation in a co-isolated weak biofilm-former CF strain was sufficient to confer hyperfilamentous growth, increased expression of hyphal-specific genes, increased monospecies biofilm formation and increased survival in dual-species biofilms formed with P. aeruginosa, indicating that ROB1G299E is a gain-of-function mutation. Disruption of ROB1 in a hyperfilamentous isolate carrying the ROB1G299E allele abolished hyperfilamentation and biofilm formation. Our study links a single heterozygous mutation to the ability of C. albicans to better survive during the interaction with other CF-associated microbes and illuminates how adaptive traits emerge in microbial pathogens to persistently colonize and/or infect the CF-patient airways.
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Affiliation(s)
- Mayssa Gnaien
- Institut Pasteur de Tunis, University of Tunis El Manar, Laboratoire de Microbiologie Moléculaire, Vaccinologie et Développement Biotechnologique (LR16IPT01), Tunis, Tunisia
| | - Corinne Maufrais
- Institut Pasteur, Université Paris Cité, INRAE USC2019A, Département Mycologie, Unité Biologie et Pathogénicité Fongiques, Paris, France
- Institut Pasteur, Université Paris Cité, Bioinformatics and Biostatistics Hub, F-75015 Paris, France
| | - Yasmine Rebai
- Institut Pasteur de Tunis, University of Tunis El Manar, Laboratoire de Microbiologie Moléculaire, Vaccinologie et Développement Biotechnologique (LR16IPT01), Tunis, Tunisia
| | - Aicha Kallel
- Institut Pasteur de Tunis, University of Tunis El Manar, Laboratoire de Microbiologie Moléculaire, Vaccinologie et Développement Biotechnologique (LR16IPT01), Tunis, Tunisia
- Hôpital La Rabta, Laboratoire de Parasitologie et de Mycologie, UR17SP03, Tunis, Tunisia
| | - Laurence Ma
- Institut Pasteur, Université Paris Cité, Biomics core facility, Centre de Ressources et Recherche Technologique (C2RT), Paris, France
| | - Samia Hamouda
- Hôpital d’Enfants Béchir Hamza de Tunis, Tunis, Tunisia
| | - Fatma Khalsi
- Hôpital d’Enfants Béchir Hamza de Tunis, Tunis, Tunisia
| | | | - Hanen Smaoui
- Hôpital d’Enfants Béchir Hamza de Tunis, Tunis, Tunisia
| | - Monia Khemiri
- Hôpital d’Enfants Béchir Hamza de Tunis, Tunis, Tunisia
| | | | - Sophie Bachellier-Bassi
- Institut Pasteur, Université Paris Cité, INRAE USC2019A, Département Mycologie, Unité Biologie et Pathogénicité Fongiques, Paris, France
| | - Imène Najjar
- Institut Pasteur, Université Paris Cité, Biomics core facility, Centre de Ressources et Recherche Technologique (C2RT), Paris, France
| | | | | | - Kalthoum Kallel
- Hôpital La Rabta, Laboratoire de Parasitologie et de Mycologie, UR17SP03, Tunis, Tunisia
| | - Helmi Mardassi
- Institut Pasteur de Tunis, University of Tunis El Manar, Laboratoire de Microbiologie Moléculaire, Vaccinologie et Développement Biotechnologique (LR16IPT01), Tunis, Tunisia
| | - Christophe d’Enfert
- Institut Pasteur, Université Paris Cité, INRAE USC2019A, Département Mycologie, Unité Biologie et Pathogénicité Fongiques, Paris, France
| | - Marie-Elisabeth Bougnoux
- Institut Pasteur, Université Paris Cité, INRAE USC2019A, Département Mycologie, Unité Biologie et Pathogénicité Fongiques, Paris, France
| | - Sadri Znaidi
- Institut Pasteur de Tunis, University of Tunis El Manar, Laboratoire de Microbiologie Moléculaire, Vaccinologie et Développement Biotechnologique (LR16IPT01), Tunis, Tunisia
- Institut Pasteur, Université Paris Cité, INRAE USC2019A, Département Mycologie, Unité Biologie et Pathogénicité Fongiques, Paris, France
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3
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Alio I, Moll R, Hoffmann T, Mamat U, Schaible UE, Pappenfort K, Alawi M, Schie M, Thünauer R, Stamm J, Rohde H, Streit WR. Stenotrophomonas maltophilia affects the gene expression profiles of the major pathogens Pseudomonas aeruginosa and Staphylococcus aureus in an in vitro multispecies biofilm model. Microbiol Spectr 2023; 11:e0085923. [PMID: 37819084 PMCID: PMC10714729 DOI: 10.1128/spectrum.00859-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/21/2023] [Indexed: 10/13/2023] Open
Abstract
IMPORTANCE In the past, studies have focused on bacterial pathogenicity in mono-species infections, in part ignoring the clinical relevance of diseases caused by more than one pathogen (i.e., polymicrobial infections). However, it is now common knowledge that multiple bacteria species are often involved in the course of an infection. For treatment of such infections, it is absolutely important to understand the dynamics of species interactions at possible infection sites and the molecular mechanisms behind these interactions. Here, we studied the impact of Stenotrophomonas maltophilia on its commensals Pseudomonas aeruginosa and Staphylococcus aureus in multispecies biofilms. We analyzed the 3D structural architectures of dual- and triple-species biofilms, niche formation within the biofilms, and the interspecies interactions on a molecular level. RNAseq data identified key genes involved in multispecies biofilm formation and interaction as potential drug targets for the clinical combat of multispecies infection with these major pathogens.
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Affiliation(s)
- Ifey Alio
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Raphael Moll
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Tim Hoffmann
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
| | - Uwe Mamat
- Cellular Microbiology, Priority Research Area Infections, Research Center Borstel, Leibniz Lung Center,Leibniz Research Alliance Infection , Borstel Gemany, Borstel, Germany
| | - Ulrich E. Schaible
- Cellular Microbiology, Priority Research Area Infections, Research Center Borstel, Leibniz Lung Center,Leibniz Research Alliance Infection , Borstel Gemany, Borstel, Germany
| | - Kai Pappenfort
- Institute of Microbiology, Friedrich Schiller University of Jena, Jena, Germany
| | - Malik Alawi
- Bioinformatics Core, UKE Hamburg, Hamburg, Germany
| | - Marcel Schie
- LIV, Leibniz Institute of Experimental Virology, Hamburg, Germany
| | - Roland Thünauer
- LIV, Leibniz Institute of Experimental Virology, Hamburg, Germany
| | - Johanna Stamm
- Institute for Medical Microbiology, Virology and Hygiene, UKE, Eppendorf, Hamburg, Germany
| | - Holger Rohde
- Institute for Medical Microbiology, Virology and Hygiene, UKE, Eppendorf, Hamburg, Germany
| | - Wolfgang R. Streit
- Department of Microbiology and Biotechnology, University Hamburg, Hamburg, Germany
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Kahl LJ, Stremmel N, Esparza-Mora MA, Wheatley RM, MacLean RC, Ralser M. Interkingdom interactions between Pseudomonas aeruginosa and Candida albicans affect clinical outcomes and antimicrobial responses. Curr Opin Microbiol 2023; 75:102368. [PMID: 37677865 DOI: 10.1016/j.mib.2023.102368] [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: 04/21/2023] [Revised: 07/24/2023] [Accepted: 07/24/2023] [Indexed: 09/09/2023]
Abstract
Infections that involve interkingdom microbial communities, such as those between bacteria and yeast pathogens, are difficult to treat, associated with worse patient outcomes, and may be a source of antimicrobial resistance. In this review, we address co-occurrence and co-infections of Candida albicans and Pseudomonas aeruginosa, two pathogens that occupy multiple infection niches in the human body, especially in immunocompromised patients. The interaction between the pathogen species influences microbe-host interactions, the effectiveness of antimicrobials and even infection outcomes, and may thus require adapted treatment strategies. However, the molecular details of bacteria-fungal interactions both inside and outside the infection sites, are insufficiently characterised. We argue that comprehensively understanding the P. aeruginosa-C. albicans interaction network through integrated systems biology approaches will capture the highly dynamic and complex nature of these polymicrobial infections and lead to a more comprehensive understanding of clinical observations such as reshaped immune defences and low antimicrobial treatment efficacy.
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Affiliation(s)
- Lisa J Kahl
- Charité Universitätsmedizin Berlin, Department of Biochemistry, 10117 Berlin, Germany
| | - Nina Stremmel
- Charité Universitätsmedizin Berlin, Department of Biochemistry, 10117 Berlin, Germany
| | | | - Rachel M Wheatley
- University of Oxford, Department of Biology, Oxford OX1 3SZ, United Kingdom
| | - R Craig MacLean
- University of Oxford, Department of Biology, Oxford OX1 3SZ, United Kingdom
| | - Markus Ralser
- Charité Universitätsmedizin Berlin, Department of Biochemistry, 10117 Berlin, Germany; University of Oxford, The Wellcome Centre for Human Genetics, Nuffield Department of Medicine, Oxford OX3 7BN, United Kingdom; Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany.
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5
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Puerner C, Vellanki S, Strauch JL, Cramer RA. Recent Advances in Understanding the Human Fungal Pathogen Hypoxia Response in Disease Progression. Annu Rev Microbiol 2023; 77:403-425. [PMID: 37713457 PMCID: PMC11034785 DOI: 10.1146/annurev-micro-032521-021745] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/17/2023]
Abstract
Fungal-mediated disease progression and antifungal drug efficacy are significantly impacted by the dynamic infection microenvironment. At the site of infection, oxygen often becomes limiting and induces a hypoxia response in both the fungal pathogen and host cells. The fungal hypoxia response impacts several important aspects of fungal biology that contribute to pathogenesis, virulence, antifungal drug susceptibility, and ultimately infection outcomes. In this review, we summarize recent advances in understanding the molecular mechanisms of the hypoxia response in the most common human fungal pathogens, discuss potential therapeutic opportunities, and highlight important areas for future research.
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Affiliation(s)
- Charles Puerner
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA;
| | - Sandeep Vellanki
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA;
| | - Julianne L Strauch
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA;
- Department of Biology, Dartmouth College, Hanover, New Hampshire, USA
| | - Robert A Cramer
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA;
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Alam F, Blackburn SA, Davis J, Massar K, Correia J, Tsai HJ, Blair JMA, Hall RA. Pseudomonas aeruginosa increases the susceptibility of Candida albicans to amphotericin B in dual-species biofilms. J Antimicrob Chemother 2023; 78:2228-2241. [PMID: 37522316 PMCID: PMC10477122 DOI: 10.1093/jac/dkad228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 07/10/2023] [Indexed: 08/01/2023] Open
Abstract
BACKGROUND Biofilms are the leading cause of nosocomial infections and are hard to eradicate due to their inherent antimicrobial resistance. Candida albicans is the leading cause of nosocomial fungal infections and is frequently co-isolated with the bacterium Pseudomonas aeruginosa from biofilms in the cystic fibrosis lung and severe burn wounds. The presence of C. albicans in multispecies biofilms is associated with enhanced antibacterial resistance, which is largely mediated through fungal extracellular carbohydrates sequestering the antibiotics. However, significantly less is known regarding the impact of polymicrobial biofilms on antifungal resistance. RESULTS Here we show that, in dual-species biofilms, P. aeruginosa enhances the susceptibility of C. albicans to amphotericin B, an effect that was biofilm specific. Transcriptional analysis combined with gene ontology enrichment analysis identified several C. albicans processes associated with oxidative stress to be differentially regulated in dual-species biofilms, suggesting that P. aeruginosa exerts oxidative stress on C. albicans, likely through the secretion of phenazines. However, the mitochondrial superoxide dismutase SOD2 was significantly down-regulated in the presence of P. aeruginosa. Monospecies biofilms of the sod2Δ mutant were more susceptible to amphotericin B, and the susceptibility of these biofilms was further enhanced by exogenous phenazines. CONCLUSIONS We propose that in dual-species biofilms, P. aeruginosa simultaneously induces mitochondrial oxidative stress, while down-regulating key detoxification enzymes, which prevents C. albicans mounting an appropriate oxidative stress response to amphotericin B, leading to fungal cell death. This work highlights the importance of understanding the impact of polymicrobial interactions on antimicrobial susceptibility.
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Affiliation(s)
- Farhana Alam
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Sarah A Blackburn
- Kent Fungal Group, Division of Natural Sciences, School of Biosciences, University of Kent, Canterbury, CT2 7NJ, UK
| | - Jack Davis
- Kent Fungal Group, Division of Natural Sciences, School of Biosciences, University of Kent, Canterbury, CT2 7NJ, UK
| | - Keely Massar
- Kent Fungal Group, Division of Natural Sciences, School of Biosciences, University of Kent, Canterbury, CT2 7NJ, UK
| | - Joao Correia
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Hung-Ji Tsai
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Jessica M A Blair
- Institute of Microbiology and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Rebecca A Hall
- Kent Fungal Group, Division of Natural Sciences, School of Biosciences, University of Kent, Canterbury, CT2 7NJ, UK
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7
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Sadiq FA, Hansen MF, Burmølle M, Heyndrickx M, Flint S, Lu W, Chen W, Zhang H. Towards understanding mechanisms and functional consequences of bacterial interactions with members of various kingdoms in complex biofilms that abound in nature. FEMS Microbiol Rev 2022; 46:6595875. [PMID: 35640890 DOI: 10.1093/femsre/fuac024] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 04/11/2022] [Accepted: 05/27/2022] [Indexed: 11/12/2022] Open
Abstract
The microbial world represents a phenomenal diversity of microorganisms from different kingdoms of life which occupy an impressive set of ecological niches. Most, if not all, microorganisms once colonise a surface develop architecturally complex surface-adhered communities which we refer to as biofilms. They are embedded in polymeric structural scaffolds serve as a dynamic milieu for intercellular communication through physical and chemical signalling. Deciphering microbial ecology of biofilms in various natural or engineered settings has revealed co-existence of microorganisms from all domains of life, including Bacteria, Archaea and Eukarya. The coexistence of these dynamic microbes is not arbitrary, as a highly coordinated architectural setup and physiological complexity show ecological interdependence and myriads of underlying interactions. In this review, we describe how species from different kingdoms interact in biofilms and discuss the functional consequences of such interactions. We highlight metabolic advances of collaboration among species from different kingdoms, and advocate that these interactions are of great importance and need to be addressed in future research. Since trans-kingdom biofilms impact diverse contexts, ranging from complicated infections to efficient growth of plants, future knowledge within this field will be beneficial for medical microbiology, biotechnology, and our general understanding of microbial life in nature.
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Affiliation(s)
- Faizan Ahmed Sadiq
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.,Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology & Food Sciences Unit, Melle, Belgium
| | - Mads Frederik Hansen
- Section of Microbiology, Department of Biology, University of Copenhagen, Denmark
| | - Mette Burmølle
- Section of Microbiology, Department of Biology, University of Copenhagen, Denmark
| | - Marc Heyndrickx
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Technology & Food Sciences Unit, Melle, Belgium.,Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
| | - Steve Flint
- School of Food and Advanced Technology, Massey University, Private Bag, 11222, Palmerston North, New Zealand
| | - Wenwei Lu
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.,State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Wei Chen
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.,State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China.,National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China
| | - Hao Zhang
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.,State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China.,National Engineering Research Center for Functional Food, Jiangnan University, Wuxi 214122, China
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Fourie R, Albertyn J, Sebolai O, Gcilitshana O, Pohl CH. Candida albicans SET3 Plays a Role in Early Biofilm Formation, Interaction With Pseudomonas aeruginosa and Virulence in Caenorhabditis elegans. Front Cell Infect Microbiol 2021; 11:680732. [PMID: 34178723 PMCID: PMC8223063 DOI: 10.3389/fcimb.2021.680732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/26/2021] [Indexed: 12/04/2022] Open
Abstract
The yeast Candida albicans exhibits multiple morphologies dependent on environmental cues. Candida albicans biofilms are frequently polymicrobial, enabling interspecies interaction through proximity and contact. The interaction between C. albicans and the bacterium, Pseudomonas aeruginosa, is antagonistic in vitro, with P. aeruginosa repressing the yeast-to-hyphal switch in C. albicans. Previous transcriptional analysis of C. albicans in polymicrobial biofilms with P. aeruginosa revealed upregulation of genes involved in regulation of morphology and biofilm formation, including SET3, a component of the Set3/Hos2 histone deacetylase complex (Set3C). This prompted the question regarding the involvement of SET3 in the interaction between C. albicans and P. aeruginosa, both in vitro and in vivo. We found that SET3 may influence early biofilm formation by C. albicans and the interaction between C. albicans and P. aeruginosa. In addition, although deletion of SET3 did not alter the morphology of C. albicans in the presence of P. aeruginosa, it did cause a reduction in virulence in a Caenorhabditis elegans infection model, even in the presence of P. aeruginosa.
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Affiliation(s)
- Ruan Fourie
- Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa
| | - Jacobus Albertyn
- Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa
| | - Olihile Sebolai
- Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa
| | - Onele Gcilitshana
- Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa
| | - Carolina H Pohl
- Department of Microbiology and Biochemistry, University of the Free State, Bloemfontein, South Africa
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