Maria João Mendes De Carvalho Diversidade De Aeromonas Sp. De
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Comparative Genomics of the Aeromonadaceae Core Oligosaccharide Biosynthetic Regions
CORE Metadata, citation and similar papers at core.ac.uk Provided by Diposit Digital de la Universitat de Barcelona International Journal of Molecular Sciences Article Comparative Genomics of the Aeromonadaceae Core Oligosaccharide Biosynthetic Regions Gabriel Forn-Cuní, Susana Merino and Juan M. Tomás * Department of Genética, Microbiología y Estadística, Universidad de Barcelona, Diagonal 643, 08071 Barcelona, Spain; [email protected] (G.-F.C.); [email protected] (S.M.) * Correspondence: [email protected]; Tel.: +34-93-4021486 Academic Editor: William Chi-shing Cho Received: 7 February 2017; Accepted: 26 February 2017; Published: 28 February 2017 Abstract: Lipopolysaccharides (LPSs) are an integral part of the Gram-negative outer membrane, playing important organizational and structural roles and taking part in the bacterial infection process. In Aeromonas hydrophila, piscicola, and salmonicida, three different genomic regions taking part in the LPS core oligosaccharide (Core-OS) assembly have been identified, although the characterization of these clusters in most aeromonad species is still lacking. Here, we analyse the conservation of these LPS biosynthesis gene clusters in the all the 170 currently public Aeromonas genomes, including 30 different species, and characterise the structure of a putative common inner Core-OS in the Aeromonadaceae family. We describe three new genomic organizations for the inner Core-OS genomic regions, which were more evolutionary conserved than the outer Core-OS regions, which presented remarkable variability. We report how the degree of conservation of the genes from the inner and outer Core-OS may be indicative of the taxonomic relationship between Aeromonas species. Keywords: Aeromonas; genomics; inner core oligosaccharide; outer core oligosaccharide; lipopolysaccharide 1. -
CHAPTER 1: General Introduction and Aims 1.1 the Genus Cronobacter: an Introduction
Diversity and virulence of the genus Cronobacter revealed by multilocus sequence typing (MLST) and comparative genomic analysis Susan Manju Joseph A thesis submitted in partial fulfilment of the requirements of Nottingham Trent University for the degree of Doctor of Philosophy July 2013 Experimental work contained in this thesis is original research carried out by the author, unless otherwise stated, in the School of Science and Technology at the Nottingham Trent University. No material contained herein has been submitted for any other degree, or at any other institution. This work is the intellectual property of the author. You may copy up to 5% of this work for private study, or personal, non-commercial research. Any re-use of the information contained within this document should be fully referenced, quoting the author, title, university, degree level and pagination. Queries or requests for any other use, or if a more substantial copy is required, should be directed in the owner(s) of the Intellectual Property Rights. Susan Manju Joseph ACKNOWLEDGEMENTS I would like to express my immense gratitude to my supervisor Prof. Stephen Forsythe for having offered me the opportunity to work on this very exciting project and for having been a motivating and inspiring mentor as well as friend through every stage of this PhD. His constant encouragement and availability for frequent meetings have played a very key role in the progress of this research project. I would also like to thank my co-supervisors, Dr. Alan McNally and Prof. Graham Ball for all the useful advice, guidance and participation they provided during the course of this PhD study. -
Delineation of Aeromonas Hydrophila Pathotypes by Dectection of Putative Virulence Factors Using Polymerase Chain Reaction and N
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by DigitalCommons@Kennesaw State University Kennesaw State University DigitalCommons@Kennesaw State University Master of Science in Integrative Biology Theses Biology & Physics Summer 7-20-2015 Delineation of Aeromonas hydrophila Pathotypes by Dectection of Putative Virulence Factors using Polymerase Chain Reaction and Nematode Challenge Assay John Metz Kennesaw State University, [email protected] Follow this and additional works at: http://digitalcommons.kennesaw.edu/integrbiol_etd Part of the Integrative Biology Commons Recommended Citation Metz, John, "Delineation of Aeromonas hydrophila Pathotypes by Dectection of Putative Virulence Factors using Polymerase Chain Reaction and Nematode Challenge Assay" (2015). Master of Science in Integrative Biology Theses. Paper 7. This Thesis is brought to you for free and open access by the Biology & Physics at DigitalCommons@Kennesaw State University. It has been accepted for inclusion in Master of Science in Integrative Biology Theses by an authorized administrator of DigitalCommons@Kennesaw State University. For more information, please contact [email protected]. Delineation of Aeromonas hydrophila Pathotypes by Detection of Putative Virulence Factors using Polymerase Chain Reaction and Nematode Challenge Assay John Michael Metz Submitted in partial fulfillment of the requirements for the Master of Science Degree in Integrative Biology Thesis Advisor: Donald J. McGarey, Ph.D Department of Molecular and Cellular Biology Kennesaw State University ABSTRACT Aeromonas hydrophila is a Gram-negative, bacterial pathogen of humans and other vertebrates. Human diseases caused by A. hydrophila range from mild gastroenteritis to soft tissue infections including cellulitis and acute necrotizing fasciitis. When seen in fish it causes dermal ulcers and fatal septicemia, which are detrimental to aquaculture stocks and has major economic impact to the industry. -
Redalyc.Aeromonas Spp.: La Infección En La Trucha Arcoíris
AquaTIC ISSN: 1578-4541 [email protected] Universidad de Zaragoza España Zepeda-Velázquez, Andrea Paloma Aeromonas spp.: la infección en la trucha arcoíris (Oncorhynchus mykiss) y su aislamiento en México. AquaTIC, núm. 42, enero-junio, 2015, pp. 1-16 Universidad de Zaragoza Zaragoza, España Disponible en: http://www.redalyc.org/articulo.oa?id=49444322001 Cómo citar el artículo Número completo Sistema de Información Científica Más información del artículo Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Página de la revista en redalyc.org Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto Revista AquaTIC, nº 42 – 2015 1 Revista científica de la Sociedad Española de Acuicultura Revista AquaTIC, nº 42, pp. 01-16. Año 2015 ISSN 1578-4541 http://www.revistaaquatic.com/ Aeromonas spp.: la infección en la trucha arcoíris (Oncorhynchus mykiss) y su aislamiento en México. Andrea Paloma1o Zepeda-Velázquez Centro de Investigación y Estudios Avanzados en Salud Animal. Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México. Carretera Toluca-Atlacomulco km 15.5. Toluca 50200, México, México. e-mail: [email protected] Resumen El género Aeromonas incluye bacterias Gram negativas que se encuentran ampliamente distribuidas en ambientes acuáticos. Estos microorganismos afectan a una amplia variedad de especies animales, incluido el hombre. En acuicultura, diversas especies de Aeromonas infectan especies de cultivo y producen pérdidas económicas significativas. De manera particular, la producción de trucha arcoíris (Oncorhynchus mykiss) contribuye significativamente en la acuicultura de México. En este trabajo se revisa la patogenia de las especies de Aeromonas que infectan a la trucha arcoíris, así como los diversos factores que modifican esta interacción. -
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Zagazig J. Agric. Res., Vol. 47 No. (1) 2020 179 -179197 Biotechnology Research http:/www.journals.zu.edu.eg/journalDisplay.aspx?Journalld=1&queryType=Master ISOLATION OF Aeromonas BACTERIOPHAGE AvF07 FROM FISH AND ITS APPLICATION FOR BIOLOGICAL CONTROL OF MULTIDRUG RESISTANT LOCAL Aeromonas veronii AFs 2 Nahed A. El-Wafai *, Fatma I. El-Zamik, S.A.M. Mahgoub and Alaa M.S. Atia Agric. Microbiol. Dept., Fac. Agric., Zagazig Univ., Egypt Received: 25/09/2019 ; Accepted: 25/11/2019 ABSTRACT: Aeromonas isolates from Nile tilapia fish, fish ponds and River water were identified as well as their bacteriophage specific. Also evaluation of antibacterial effect of both nanoparticles and phage therapy against the pathogenic Aeromonas veronii AFs 2. Differentiation of Aeromonas spp. was done on the basis of 25 different biochemical tests and confirmed by sequencing of 16s rRNA gene as (A. caviae AFg, A. encheleia AWz, A. molluscorum AFm, A. salmonicida AWh, A. veronii AFs 2, A. veronii bv. veronii AFi). All of the six Aeromonas strains were resistant to β-actam (amoxicillin/ lavulanic acid) antibiotics. However, the resistance to other antibiotics was variable. All Aeromonas strains were found to be resistant to ampicillin, cephalexin, cephradine, amoxicillin/clavulanic acid, rifampin and cephalothin. Sensitivity of 6 Aeromonas strains raised against 7 concentrations of chitosan nanoparticles. Using well diffusion method spherically shaped silver nanoparticles AgNPs with an average size of ~ 20 nm, showed a great antimicrobial activity against A. veronii AFs 2 and five more strains of Aeromonas spp. At the concentration of 20, 24, 32 and 40 µg/ml. Thermal inactivation point was 84 oC for phage AvF07 which was sensitive to storage at 4 oC compared with the storage at - o 20 C. -
An Update on the Genus Aeromonas: Taxonomy, Epidemiology, and Pathogenicity
microorganisms Review An Update on the Genus Aeromonas: Taxonomy, Epidemiology, and Pathogenicity Ana Fernández-Bravo and Maria José Figueras * Unit of Microbiology, Department of Basic Health Sciences, Faculty of Medicine and Health Sciences, IISPV, University Rovira i Virgili, 43201 Reus, Spain; [email protected] * Correspondence: mariajose.fi[email protected]; Tel.: +34-97-775-9321; Fax: +34-97-775-9322 Received: 31 October 2019; Accepted: 14 January 2020; Published: 17 January 2020 Abstract: The genus Aeromonas belongs to the Aeromonadaceae family and comprises a group of Gram-negative bacteria widely distributed in aquatic environments, with some species able to cause disease in humans, fish, and other aquatic animals. However, bacteria of this genus are isolated from many other habitats, environments, and food products. The taxonomy of this genus is complex when phenotypic identification methods are used because such methods might not correctly identify all the species. On the other hand, molecular methods have proven very reliable, such as using the sequences of concatenated housekeeping genes like gyrB and rpoD or comparing the genomes with the type strains using a genomic index, such as the average nucleotide identity (ANI) or in silico DNA–DNA hybridization (isDDH). So far, 36 species have been described in the genus Aeromonas of which at least 19 are considered emerging pathogens to humans, causing a broad spectrum of infections. Having said that, when classifying 1852 strains that have been reported in various recent clinical cases, 95.4% were identified as only four species: Aeromonas caviae (37.26%), Aeromonas dhakensis (23.49%), Aeromonas veronii (21.54%), and Aeromonas hydrophila (13.07%). -
A Primary Assessment of the Endophytic Bacterial Community in a Xerophilous Moss (Grimmia Montana) Using Molecular Method and Cultivated Isolates
Brazilian Journal of Microbiology 45, 1, 163-173 (2014) Copyright © 2014, Sociedade Brasileira de Microbiologia ISSN 1678-4405 www.sbmicrobiologia.org.br Research Paper A primary assessment of the endophytic bacterial community in a xerophilous moss (Grimmia montana) using molecular method and cultivated isolates Xiao Lei Liu, Su Lin Liu, Min Liu, Bi He Kong, Lei Liu, Yan Hong Li College of Life Science, Capital Normal University, Haidian District, Beijing, China. Submitted: December 27, 2012; Approved: April 1, 2013. Abstract Investigating the endophytic bacterial community in special moss species is fundamental to under- standing the microbial-plant interactions and discovering the bacteria with stresses tolerance. Thus, the community structure of endophytic bacteria in the xerophilous moss Grimmia montana were esti- mated using a 16S rDNA library and traditional cultivation methods. In total, 212 sequences derived from the 16S rDNA library were used to assess the bacterial diversity. Sequence alignment showed that the endophytes were assigned to 54 genera in 4 phyla (Proteobacteria, Firmicutes, Actinobacteria and Cytophaga/Flexibacter/Bacteroids). Of them, the dominant phyla were Proteobacteria (45.9%) and Firmicutes (27.6%), the most abundant genera included Acinetobacter, Aeromonas, Enterobacter, Leclercia, Microvirga, Pseudomonas, Rhizobium, Planococcus, Paenisporosarcina and Planomicrobium. In addition, a total of 14 species belonging to 8 genera in 3 phyla (Proteo- bacteria, Firmicutes, Actinobacteria) were isolated, Curtobacterium, Massilia, Pseudomonas and Sphingomonas were the dominant genera. Although some of the genera isolated were inconsistent with those detected by molecular method, both of two methods proved that many different endophytic bacteria coexist in G. montana. According to the potential functional analyses of these bacteria, some species are known to have possible beneficial effects on hosts, but whether this is the case in G. -
Salmonicida from Aeromonas Bestiarum
RESEARCH ARTICLE INTERNATIONAL MICROBIOLOGY (2005) 8:259-269 www.im.microbios.org Antonio J. Martínez-Murcia1* Phenotypic, genotypic, and Lara Soler2 Maria José Saavedra1,3 phylogenetic discrepancies Matilde R. Chacón Josep Guarro2 to differentiate Aeromonas Erko Stackebrandt4 2 salmonicida from María José Figueras Aeromonas bestiarum 1Molecular Diagnostics Center, and Univ. Miguel Hernández, Orihuela, Alicante, Spain 2Microbiology Unit, Summary. The taxonomy of the “Aeromonas hydrophila” complex (compris- Dept. of Basic Medical Sciences, ing the species A. hydrophila, A. bestiarum, A. salmonicida, and A. popoffii) has Univ. Rovira i Virgili, Reus, Spain been controversial, particularly the relationship between the two relevant fish 3Dept. of Veterinary Sciences, pathogens A. salmonicida and A. bestiarum. In fact, none of the biochemical tests CECAV-Univ. of Trás-os-Montes evaluated in the present study were able to separate these two species. One hun- e Alto Douro, Vila Real, Portugal dred and sixteen strains belonging to the four species of this complex were iden- 4DSMZ-Deutsche Sammlung von tified by 16S rDNA restriction fragment length polymorphism (RFLP). Mikroorganismen und Zellkulturen Sequencing of the 16S rDNA and cluster analysis of the 16S–23S intergenic GmbH, Braunschwieg, Germany spacer region (ISR)-RFLP in selected strains of A. salmonicida and A. bestiarum indicated that the two species may share extremely conserved ribosomal operons and demonstrated that, due to an extremely high degree of sequence conserva- tion, 16S rDNA cannot be used to differentiate these two closely related species. Moreover, DNA–DNA hybridization similarity between the type strains of A. salmonicida subsp. salmonicida and A. bestiarum was 75.6 %, suggesting that Received 8 September 2005 they may represent a single taxon. -
Masarykova Univerzita V Brně Lékařská Fakulta VÝSKYT AEROMONÁD V KLINICKÉM MATERIÁLU a PROSTŘEDÍ Bakalářská Práce
Masarykova univerzita v Brně Lékařská fakulta VÝSKYT AEROMONÁD V KLINICKÉM MATERIÁLU A PROSTŘEDÍ Bakalářská práce v oboru zdravotní laborant Vedoucí bakalářské práce: Autor: Doc. RNDr. Ivo Sedláček, CSc. Eva Kroupová Brno, duben 2012 Jméno a příjmení autora: Eva Kroupová Název bakalářské práce: Výskyt aeromonád v klinickém materiálu a prostředí Pracoviště: MU, Ústav experimentální biologie, Česká sbírka mikroorganismů Vedoucí bakalářské práce: Doc. RNDr. Ivo Sedláček, CSc. Rok obhajoby bakalářské práce: 2012 Souhrn: Ve své práci se věnuji popisu rodu Aeromonas, jejich možnostem izolace a identifikace, která je důležitá zejména v klinické humánní medicíně. Klíčová slova: rod Aeromonas, identifikace, aeromonádové infekce Souhlasím, aby práce byla půjčována ke studijním účelům a byla citována dle platných norem. Prohlašuji, že jsem bakalářskou práci vypracovala samostatně pod vedením Doc. RNDr. Ivo Sedláčka, CSc. a uvedla jsem v seznamu literatury všechny odborné a literární zdroje. V Brně dne…………. ………………………………… (vlastnoruční podpis autora) Ráda bych poděkovala Doc. RNDr. Ivo Sedláčkovi, CSc. za cenné odborné rady a pomoc, kterou mi věnoval při psaní této práce. Seznam zkratek a symbolů bv. biovar DNA deoxyribonukleová kyselina PCR polymerázová řetězová reakce RNA ribonukleová kyselina spp více druhů téhož rodu (bez bližší specifikace) subsp subspecies (poddruh) TCŽS thiosulfát-citrát-žluč-sacharóza agar + pozitivní reakce - negativní reakce v variabilní realce Obsah 1. Úvod ................................................................................................................. -
Succession of Lignocellulolytic Bacterial Consortia Bred Anaerobically from Lake Sediment
bs_bs_banner Succession of lignocellulolytic bacterial consortia bred anaerobically from lake sediment Elisa Korenblum,*† Diego Javier Jimenez and A total of 160 strains was isolated from the enrich- Jan Dirk van Elsas ments. Most of the strains tested (78%) were able to Department of Microbial Ecology,Groningen Institute for grow anaerobically on carboxymethyl cellulose and Evolutionary Life Sciences,University of Groningen, xylan. The final consortia yield attractive biological Groningen,The Netherlands. tools for the depolymerization of recalcitrant ligno- cellulosic materials and are proposed for the produc- tion of precursors of biofuels. Summary Anaerobic bacteria degrade lignocellulose in various Introduction anoxic and organically rich environments, often in a syntrophic process. Anaerobic enrichments of bacte- Lignocellulose is naturally depolymerized by enzymes of rial communities on a recalcitrant lignocellulose microbial communities that develop in soil as well as in source were studied combining polymerase chain sediments of lakes and rivers (van der Lelie et al., reaction–denaturing gradient gel electrophoresis, 2012). Sediments in organically rich environments are amplicon sequencing of the 16S rRNA gene and cul- usually waterlogged and anoxic, already within a cen- turing. Three consortia were constructed using the timetre or less of the sediment water interface. There- microbiota of lake sediment as the starting inoculum fore, much of the organic detritus is probably degraded and untreated switchgrass (Panicum virgatum) (acid by anaerobic processes in such systems (Benner et al., or heat) or treated (with either acid or heat) as the 1984). Whereas fungi are well-known lignocellulose sole source of carbonaceous compounds. Addition- degraders in toxic conditions, due to their oxidative ally, nitrate was used in order to limit sulfate reduc- enzymes (Wang et al., 2013), in anoxic environments tion and methanogenesis. -
Identification and Characterization of Aeromonas Species Isolated from Ready- To-Eat Lettuce Products
Master's thesis Noelle Umutoni Identification and Characterization of Aeromonas species isolated 2019 from ready-to-eat lettuce Master's thesis products. Noelle Umutoni NTNU May 2019 Norwegian University of Science and Technology Faculty of Natural Sciences Department of Biotechnology and Food Science Identification and Characterization of Aeromonas species isolated from ready- to-eat lettuce products. Noelle Umutoni Food science and Technology Submission date: May 2019 Supervisor: Lisbeth Mehli Norwegian University of Science and Technology Department of Biotechnology and Food Science Preface This thesis covers 45 ECTS-credits and was carried out as part of the M. Sc. programme for Food and Technology at the institute of Biotechnology and Food Science, faculty of natural sciences at the Norwegian University of Science and Technology in Trondheim in spring 2019. First, I would like to express my gratitude to my main supervisor Associate professor Lisbeth Mehli. Thank you for the laughs, advice, and continuous encouragement throughout the project. Furthermore, appreciations to PhD Assistant professor Gunn Merethe Bjørge Thomassen for valuable help in the lab. Great thanks to my family and friends for their patience and encouragement these past years. Thank you for listening, despite not always understanding the context of my studies. A huge self-five to myself, for putting in the work. Finally, a tremendous thank you to Johan – my partner in crime and in life. I could not have done this without you. You kept me fed, you kept sane. I appreciate you from here to eternity. Mama, we made it! 15th of May 2019 Author Noelle Umutoni I Abstract Aeromonas spp. -
Comparative Genomics of the Aeromonadaceae Core Oligosaccharide Biosynthetic Regions
International Journal of Molecular Sciences Article Comparative Genomics of the Aeromonadaceae Core Oligosaccharide Biosynthetic Regions Gabriel Forn-Cuní, Susana Merino and Juan M. Tomás * Department of Genética, Microbiología y Estadística, Universidad de Barcelona, Diagonal 643, 08071 Barcelona, Spain; [email protected] (G.-F.C.); [email protected] (S.M.) * Correspondence: [email protected]; Tel.: +34-93-4021486 Academic Editor: William Chi-shing Cho Received: 7 February 2017; Accepted: 26 February 2017; Published: 28 February 2017 Abstract: Lipopolysaccharides (LPSs) are an integral part of the Gram-negative outer membrane, playing important organizational and structural roles and taking part in the bacterial infection process. In Aeromonas hydrophila, piscicola, and salmonicida, three different genomic regions taking part in the LPS core oligosaccharide (Core-OS) assembly have been identified, although the characterization of these clusters in most aeromonad species is still lacking. Here, we analyse the conservation of these LPS biosynthesis gene clusters in the all the 170 currently public Aeromonas genomes, including 30 different species, and characterise the structure of a putative common inner Core-OS in the Aeromonadaceae family. We describe three new genomic organizations for the inner Core-OS genomic regions, which were more evolutionary conserved than the outer Core-OS regions, which presented remarkable variability. We report how the degree of conservation of the genes from the inner and outer Core-OS may be indicative of the taxonomic relationship between Aeromonas species. Keywords: Aeromonas; genomics; inner core oligosaccharide; outer core oligosaccharide; lipopolysaccharide 1. Introduction Aeromonads are an heterogeneous group of Gram-negative bacteria emerging as important pathogens of both gastrointestinal and extraintestinal diseases in a great evolutionary range of animals: from fish to mammals, including humans [1].