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Metabolic and Genetic Basis for Auxotrophies in Gram-Negative Species
Metabolic and genetic basis for auxotrophies in Gram-negative species Yara Seifa,1 , Kumari Sonal Choudharya,1 , Ying Hefnera, Amitesh Ananda , Laurence Yanga,b , and Bernhard O. Palssona,c,2 aSystems Biology Research Group, Department of Bioengineering, University of California San Diego, CA 92122; bDepartment of Chemical Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada; and cNovo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800 Lyngby, Denmark Edited by Ralph R. Isberg, Tufts University School of Medicine, Boston, MA, and approved February 5, 2020 (received for review June 18, 2019) Auxotrophies constrain the interactions of bacteria with their exist in most free-living microorganisms, indicating that they rely environment, but are often difficult to identify. Here, we develop on cross-feeding (25). However, it has been demonstrated that an algorithm (AuxoFind) using genome-scale metabolic recon- amino acid auxotrophies are predicted incorrectly as a result struction to predict auxotrophies and apply it to a series of the insufficient number of known gene paralogs (26). Addi- of available genome sequences of over 1,300 Gram-negative tionally, these methods rely on the identification of pathway strains. We identify 54 auxotrophs, along with the corre- completeness, with a 50% cutoff used to determine auxotrophy sponding metabolic and genetic basis, using a pangenome (25). A mechanistic approach is expected to be more appropriate approach, and highlight auxotrophies conferring a fitness advan- and can be achieved using genome-scale models of metabolism tage in vivo. We show that the metabolic basis of auxotro- (GEMs). For example, requirements can arise by means of a sin- phy is species-dependent and varies with 1) pathway structure, gle deleterious mutation in a conditionally essential gene (CEG), 2) enzyme promiscuity, and 3) network redundancy. -
Public Health Aspects of Yersinia Pseudotuberculosis in Deer and Venison
Copyright is owned by the Author of the thesis. Permission is given for a copy to be downloaded by an individual for the purpose of research and private study only. The thesis may not be reproduced elsewhere without the permission of the Author. PUBLIC HEALTH ASPECTS OF YERSINIA PSEUDOTUBERCULOSIS IN DEER AND VENISON A THESIS PRESENTED IN PARTIAL FULFlLMENT (75%) OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF PHILOSOPHY IN VETERINARY PUBLIC HEALTH AT MASSEY UNIVERSITY EDWIN BOSI September, 1992 DEDICATED TO MY PARENTS (MR. RICHARD BOSI AND MRS. VICTORIA CHUAN) MY WIFE (EVELYN DEL ROZARIO) AND MY CHILDREN (AMELIA, DON AND JACQUELINE) i Abstract A study was conducted to determine the possible carriage of Yersinia pseudotuberculosisand related species from faeces of farmed Red deer presented/or slaughter and the contamination of deer carcase meat and venison products with these organisms. Experiments were conducted to study the growth patternsof !.pseudotuberculosis in vacuum packed venison storedat chilling andfreezing temperatures. The serological status of slaughtered deer in regards to l..oseudotubercu/osis serogroups 1, 2 and 3 was assessed by Microp late Agglutination Tests. Forty sera were examined comprising 19 from positive and 20 from negative intestinal carriers. Included in this study was one serum from an animal that yielded carcase meat from which l..pseudotuberculosiswas isolated. Caecal contents were collected from 360 animals, and cold-enriched for 3 weeks before being subjected to bacteriological examination for Yersinia spp. A total of 345 and 321 carcases surface samples for bacteriological examination for Yersiniae were collected at the Deer Slaughter Premises (DSP) and meat Packing House respectively. -
A Case Series of Diarrheal Diseases Associated with Yersinia Frederiksenii
Article A Case Series of Diarrheal Diseases Associated with Yersinia frederiksenii Eugene Y. H. Yeung Department of Medical Microbiology, The Ottawa Hospital General Campus, The University of Ottawa, Ottawa, ON K1H 8L6, Canada; [email protected] Abstract: To date, Yersinia pestis, Yersinia enterocolitica, and Yersinia pseudotuberculosis are the three Yersinia species generally agreed to be pathogenic in humans. However, there are a limited number of studies that suggest some of the “non-pathogenic” Yersinia species may also cause infections. For instance, Yersinia frederiksenii used to be known as an atypical Y. enterocolitica strain until rhamnose biochemical testing was found to distinguish between these two species in the 1980s. From our regional microbiology laboratory records of 18 hospitals in Eastern Ontario, Canada from 1 May 2018 to 1 May 2021, we identified two patients with Y. frederiksenii isolates in their stool cultures, along with their clinical presentation and antimicrobial management. Both patients presented with diarrhea, abdominal pain, and vomiting for 5 days before presentation to hospital. One patient received a 10-day course of sulfamethoxazole-trimethoprim; his Y. frederiksenii isolate was shown to be susceptible to amoxicillin-clavulanate, ceftriaxone, ciprofloxacin, and sulfamethoxazole- trimethoprim, but resistant to ampicillin. The other patient was sent home from the emergency department and did not require antimicrobials and additional medical attention. This case series illustrated that diarrheal disease could be associated with Y. frederiksenii; the need for antimicrobial treatment should be determined on a case-by-case basis. Keywords: Yersinia frederiksenii; Yersinia enterocolitica; yersiniosis; diarrhea; microbial sensitivity tests; Citation: Yeung, E.Y.H. A Case stool culture; sulfamethoxazole-trimethoprim; gastroenteritis Series of Diarrheal Diseases Associated with Yersinia frederiksenii. -
JMBFS / Surname of Author Et Al. 20Xx X (X) X-Xx
DIVERSITY OF BACTERIA IN SLOVAK AND FOREIGN HONEY, WITH ASSESSMENT OF ITS PHYSICO- CHEMICAL QUALITY AND COUNTS OF CULTIVABLE MICROORGANISMS Vladimíra Kňazovická1, Michal Gábor2, Martina Miluchová2, Marek Bobko3, Juraj Medo*4 Address(es): Ing. Juraj Medo, PhD. 1National Agricultural and Food Centre, Research Institute for Animal Production Nitra, Institute of Apiculture Liptovsky Hradok, Gasperikova 599, 033 80 Liptovsky Hradok, Slovakia. 2Slovak University of Agriculture in Nitra, Faculty of Agrobiology and Food Resources, Department of Genetics and Animal Breeding Biology, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia. 3Slovak University of Agriculture in Nitra, Faculty of Biotechnology and Food Sciences, Department of Technology and Quality of Animal Products, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia. 4Slovak University of Agriculture in Nitra, Faculty of Biotechnology and Food Sciences, Department of Microbiology, Tr. A. Hlinku 2, 949 76 Nitra, Slovakia, phone number: +421 37 641 5810. *Corresponding author: [email protected] doi: 10.15414/jmbfs.2019.9.special.414-421 ARTICLE INFO ABSTRACT Received 23. 8. 2019 The aim of the study was to assess microbial microbiome of 30 honey samples and compare potential differences between the samples Revised 7. 10. 2019 from apiaries and commercial trade in Slovakia and foreign countries (Latvia, Switzerland, India, Japan and Tanzania) as well as to Accepted 10. 10. 2019 indicate their physico-chemical and basic microbiological quality. Study of each sample consisted of physico-chemical analysis (water Published 8. 11. 2019 content, pH, free acidity and electrical conductivity), basic microbiological analysis performed by dilution plating method (total plate count, sporulating aerobic microorganisms, bacteria from Enterobacteriaceae family, preliminary lactic acid bacteria and microscopic fungi) and metagenomic analysis for bacterial diversity evaluation. -
Chemosynthetic Symbiont with a Drastically Reduced Genome Serves As Primary Energy Storage in the Marine Flatworm Paracatenula
Chemosynthetic symbiont with a drastically reduced genome serves as primary energy storage in the marine flatworm Paracatenula Oliver Jäcklea, Brandon K. B. Seaha, Målin Tietjena, Nikolaus Leischa, Manuel Liebekea, Manuel Kleinerb,c, Jasmine S. Berga,d, and Harald R. Gruber-Vodickaa,1 aMax Planck Institute for Marine Microbiology, 28359 Bremen, Germany; bDepartment of Geoscience, University of Calgary, AB T2N 1N4, Canada; cDepartment of Plant & Microbial Biology, North Carolina State University, Raleigh, NC 27695; and dInstitut de Minéralogie, Physique des Matériaux et Cosmochimie, Université Pierre et Marie Curie, 75252 Paris Cedex 05, France Edited by Margaret J. McFall-Ngai, University of Hawaii at Manoa, Honolulu, HI, and approved March 1, 2019 (received for review November 7, 2018) Hosts of chemoautotrophic bacteria typically have much higher thrive in both free-living environmental and symbiotic states, it is biomass than their symbionts and consume symbiont cells for difficult to attribute their genomic features to either functions nutrition. In contrast to this, chemoautotrophic Candidatus Riegeria they provide to their host, or traits that are necessary for envi- symbionts in mouthless Paracatenula flatworms comprise up to ronmental survival or to both. half of the biomass of the consortium. Each species of Paracate- The smallest genomes of chemoautotrophic symbionts have nula harbors a specific Ca. Riegeria, and the endosymbionts have been observed for the gammaproteobacterial symbionts of ves- been vertically transmitted for at least 500 million years. Such icomyid clams that are directly transmitted between host genera- prolonged strict vertical transmission leads to streamlining of sym- tions (13, 14). Such strict vertical transmission leads to substantial biont genomes, and the retained physiological capacities reveal and ongoing genome reduction. -
Two Copies of the Ail Gene Found in Yersinia Enterocolitica and Yersinia
1 Two copies of the ail gene found in Yersinia enterocolitica and Yersinia 2 kristensenii 3 4 Suvi Joutsena,b, Per Johanssona, Riikka Laukkanen-Niniosa,c, Johanna Björkrotha and Maria 5 Fredriksson-Ahomaaa 6 7 aDepartment of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, 8 P.O.Box 66 (Agnes Sjöbergin katu 2), 00014 University of Helsinki, Finland 9 bRisk Assessment Unit, Finnish Food Authority, Helsinki, Finland 10 cFood Safety Unit, Finnish Food Authority, Helsinki, Finland 11 12 Corresponding author: 13 E-mail address: [email protected] 1 14 Abstract 15 16 Yersinia enterocolitica is the most common Yersinia species causing foodborne infections in 17 humans. Pathogenic strains carry the chromosomal ail gene, which is essential for bacterial 18 attachment to and invasion into host cells and for serum resistance. This gene is commonly 19 amplified in several PCR assays detecting pathogenic Y. enterocolitica in food samples and 20 discriminating pathogenic isolates from non-pathogenic ones. We have isolated several non- 21 pathogenic ail-positive Yersinia strains from various sources in Finland. For this study, we 22 selected 16 ail-positive Yersinia strains, which were phenotypically and genotypically 23 characterised. Eleven strains were confirmed to belong to Y. enterocolitica and five strains to 24 Yersinia kristensenii using whole-genome alignment, Parsnp and the SNP phylogenetic tree. 25 All Y. enterocolitica strains belonged to non-pathogenic biotype 1A. We found two copies of 26 the ail gene (ail1 and ail2) in all five Y. kristensenii strains and in one Y. enterocolitica 27 biotype 1A strain. All 16 Yersinia strains carried the ail1 gene consisting of three different 28 sequence patterns (A6-A8), which were highly similar with the ail gene found in high- 29 pathogenic Y. -
Lists of Names of Prokaryotic Candidatus Taxa
NOTIFICATION LIST: CANDIDATUS LIST NO. 1 Oren et al., Int. J. Syst. Evol. Microbiol. DOI 10.1099/ijsem.0.003789 Lists of names of prokaryotic Candidatus taxa Aharon Oren1,*, George M. Garrity2,3, Charles T. Parker3, Maria Chuvochina4 and Martha E. Trujillo5 Abstract We here present annotated lists of names of Candidatus taxa of prokaryotes with ranks between subspecies and class, pro- posed between the mid- 1990s, when the provisional status of Candidatus taxa was first established, and the end of 2018. Where necessary, corrected names are proposed that comply with the current provisions of the International Code of Nomenclature of Prokaryotes and its Orthography appendix. These lists, as well as updated lists of newly published names of Candidatus taxa with additions and corrections to the current lists to be published periodically in the International Journal of Systematic and Evo- lutionary Microbiology, may serve as the basis for the valid publication of the Candidatus names if and when the current propos- als to expand the type material for naming of prokaryotes to also include gene sequences of yet-uncultivated taxa is accepted by the International Committee on Systematics of Prokaryotes. Introduction of the category called Candidatus was first pro- morphology, basis of assignment as Candidatus, habitat, posed by Murray and Schleifer in 1994 [1]. The provisional metabolism and more. However, no such lists have yet been status Candidatus was intended for putative taxa of any rank published in the journal. that could not be described in sufficient details to warrant Currently, the nomenclature of Candidatus taxa is not covered establishment of a novel taxon, usually because of the absence by the rules of the Prokaryotic Code. -
Reclassification of Seven Honey Bee Symbiont Strains As Bombella Apis
bioRxiv preprint doi: https://doi.org/10.1101/2020.05.06.081802; this version posted May 8, 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 4.0 International license. 1 Reclassification of seven honey bee symbiont strains as Bombella apis 2 3 Eric A. Smith1, Kirk E. Anderson2, Vanessa Corby-Harris2, Quinn S. McFrederick3, and Irene L. 4 G. Newton1* 5 6 1Department of Biology, Indiana University, Bloomington, Indiana, USA 7 2Carl Hayden Bee Research Center, USDA-ARS, Tucson, Arizona, USA 8 3Department of Entomology, University of California, Riverside, California, USA 9 *Author for Correspondence: Irene L. G. Newton, Department of Biology, Indiana University, 10 Bloomington, Indiana, USA, (812) 855-3883, [email protected] 11 12 Abstract 13 Honey bees are important pollinators of many major crops and add billions of dollars annually to 14 the US economy through their services. Recent declines in the health of the honey bee have 15 startled researchers and lay people alike as honey bees are agriculture’s most important 16 pollinator. One factor that may influence colony health is the microbial community. Although 17 honey bee worker guts have a characteristic community of bee-specific microbes, the honey bee 18 queen digestive tracts are colonized predominantly by a single acetic acid bacterium tentatively 19 named Candidatus Parasaccharibacter apium. This bacterium is related to flower-associated 20 microbes such as Saccharibacter floricola, and initial phylogenetic analyses placed it as sister to 21 these environmental bacteria. -
Genomic Signatures of Honey Bee Association in an Acetic Acid Symbiont
bioRxiv preprint doi: https://doi.org/10.1101/367490; this version posted May 7, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Genomic signatures of honey bee association in an acetic acid symbiont 2 3 Eric A. Smith1 and Irene L. G. Newton1* 4 5 aDepartment of Biology, Indiana University, Bloomington, Indiana, USA 6 *Author for Correspondence: Irene L. G. Newton, Department of Biology, Indiana University, 7 Bloomington, Indiana, USA, (812) 855-3883, [email protected] 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 bioRxiv preprint doi: https://doi.org/10.1101/367490; this version posted May 7, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 24 Abstract 25 Honey bee queens are central to the success and productivity of their colonies; queens are the 26 only reproductive members of the colony, and therefore queen longevity and fecundity can 27 directly impact overall colony health. Recent declines in the health of the honey bee have startled 28 researchers and lay people alike as honey bees are agriculture’s most important pollinator. Honey 29 bees are important pollinators of many major crops and add billions of dollars annually to the US 30 economy through their services. One factor that may influence queen and colony health is the 31 microbial community. Although honey bee worker guts have a characteristic community of bee- 32 specific microbes, the honey bee queen digestive tracts are colonized by a few bacteria, notably 33 an acetic acid bacterium not seen in worker guts: Bombella apis. -
And White-Tailed Deer
Food Microbiology 78 (2019) 82–88 Contents lists available at ScienceDirect Food Microbiology journal homepage: www.elsevier.com/locate/fm Microbial contamination of moose (Alces alces) and white-tailed deer T (Odocoileus virginianus) carcasses harvested by hunters ∗ Mikaela Sauvalaa, , Sauli Laaksonenb, Riikka Laukkanen-Niniosa, Katri Jalavaa,c, Roger Stephand, Maria Fredriksson-Ahomaaa a Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, Finland b Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Finland c Department of Statistics and Mathematics, Faculty of Science, University of Helsinki, Finland d Institute for Food Safety and Hygiene, Vetsuisse Faculty, University of Zurich, Switzerland ARTICLE INFO ABSTRACT Keywords: Hunting is currently a very popular activity, and interest in game meat is increasing. However, only limited Moose research is available on the bacterial quality and safety of moose (Alces alces) and white-tailed deer (Odocoileus Deer virginianus) harvested by hunters. Poor hunting hygiene can spread bacteria onto the carcasses, and inadequate Hunting hygiene chilling of the carcasses may increase the bacterial load on the carcass surface. We studied the bacterial con- Carcass tamination level on carcasses of 100 moose and 100 white-tailed deer shot in southern Finland. Hunters evis- Bacterial contamination cerated carcasses in the field and skinned them in small slaughter facilities. During the sampling, same person visited 25 facilities located in 12 municipalities of four provinces. Moose carcasses had mean mesophilic aerobic 2 bacteria (MAB), Enterobacteriaceae (EB) and Escherichia coli (EC) values of 4.2, 2.6 and 1.2 log10 cfu/cm , re- 2 spectively, while deer carcass values were 4.5, 1.5 and 0.7 log10 cfu/cm , respectively. -
Sphingopyxis Sp. Strain OPL5, an Isoprene-Degrading Bacterium from the Sphingomonadaceae Family Isolated from Oil Palm Leaves
microorganisms Article Sphingopyxis sp. Strain OPL5, an Isoprene-Degrading Bacterium from the Sphingomonadaceae Family Isolated from Oil Palm Leaves Nasmille L. Larke-Mejía 1 , Ornella Carrión 1 , Andrew T. Crombie 2, Terry J. McGenity 3 and J. Colin Murrell 1,* 1 School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK; [email protected] (N.L.L.-M.); [email protected] (O.C.) 2 School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK; [email protected] 3 School of Life Sciences, University of Essex, Colchester CO4 3SQ, UK; [email protected] * Correspondence: [email protected]; Tel.: +44-01603-592959 Received: 2 September 2020; Accepted: 7 October 2020; Published: 10 October 2020 Abstract: The volatile secondary metabolite, isoprene, is released by trees to the atmosphere in enormous quantities, where it has important effects on air quality and climate. Oil palm trees, one of the highest isoprene emitters, are increasingly dominating agroforestry over large areas of Asia, with associated uncertainties over their effects on climate. Microbes capable of using isoprene as a source of carbon for growth have been identified in soils and in the tree phyllosphere, and most are members of the Actinobacteria. Here, we used DNA stable isotope probing to identify the isoprene-degrading bacteria associated with oil palm leaves and inhabiting the surrounding soil. Among the most abundant isoprene degraders of the leaf-associated community were members of the Sphingomonadales, although no representatives of this order were previously known to degrade isoprene. Informed by these data, we obtained representatives of the most abundant isoprene degraders in enrichments, including Sphingopyxis strain OPL5 (Sphingomonadales), able to grow on isoprene as the sole source of carbon and energy. -
Composition and Molecular Identification of Bacterial Community in Seawater Desalination Plants
Advances in Microbiology, 2019, 9, 863-876 https://www.scirp.org/journal/aim ISSN Online: 2165-3410 ISSN Print: 2165-3402 Composition and Molecular Identification of Bacterial Community in Seawater Desalination Plants Pilar Garcia-Jimenez1* , Marina Carrasco-Acosta1, Carlos Enrique Payá1, Irina Alemán López1, Juana Rosa Betancort Rodríguez2, José Alberto Herrera Melián3 1Department of Biology, Universidad de Las Palmas de Gran Canaria, Campus de Tafira, Las Palmas, Spain 2Department of Water, Instituto Tecnológico de Canarias, Playa de Pozo Izquierdo, Las Palmas, Spain 3Department of Chemistry, Universidad de Las Palmas de Gran Canaria, Campus de Tafira, Las Palmas, Spain How to cite this paper: Garcia-Jimenez, Abstract P., Carrasco-Acosta, M., Payá, C.E., López, I.A., Rodríguez, J.R.B. and Melián, J.A.H. Biofouling is an important problem for reverse osmosis (RO) membrane (2019) Composition and Molecular Iden- manufacturers. Bacteria are mainly involved in generating fouling and obtu- tification of Bacterial Community in Sea- rating RO membranes. Insights into biofilm bacteria composition could help water Desalination Plants. Advances in Microbiology, 9, 863-876. prevent biofouling, reduce the cost of using RO-fouling membranes and guar- https://doi.org/10.4236/aim.2019.910053 antee safe water. Culture-dependent and independent techniques were then performed in order to identify bacteria associated with RO membranes. Bac- Received: July 23, 2019 teria cultures described the presence of six pure colonies, four of which were Accepted: October 18, 2019 Published: October 21, 2019 identified through API testing. Based on 16s rRNA gene analysis, a predomi- nant bacterium was identified and annotated as Sphingomonas sp.