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Contò F, Tyler S, Paletta P, Battelli L. The role of the parietal lobe in task-irrelevant suppression during learning. Brain Stimul 2023; 16:715-723. [PMID: 37062348 DOI: 10.1016/j.brs.2023.04.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 04/07/2023] [Accepted: 04/13/2023] [Indexed: 04/18/2023] Open
Abstract
BACKGROUND Attention optimizes the selection of visual information, while suppressing irrelevant visual input through cortical mechanisms that are still unclear. We set to investigate these processes using an attention task with an embedded to-be-ignored interfering visual input. OBJECTIVE We delivered electrical stimulation to attention-related brain areas to modulate these facilitatory/inhibitory attentional mechanisms. We asked whether overtly training on a task while being covertly exposed to visual features from a visually identical but different task tested at baseline might influence post-training performance on the baseline task. METHODS In Experiment one, at baseline subjects performed an orientation discrimination (OD) task using a pair of gratings presented at individual's psychophysical threshold. We then trained participants over three-day separate sessions on a temporal order judgment task (TOJ), using the exact same gratings but presented with different time offsets. On the last post-training session we re-tested OD. We coupled training with transcranial random noise stimulation (tRNS) over the parietal cortex, the human middle temporal area or sham, in three separate groups. In Experiment two, subjects performed the same OD task at baseline and post-training, while tRNS was delivered at rest during the same sessions and stimulation conditions as in Experiment one. RESULTS Results showed that tRNS over parietal cortex facilitated learning of the trained TOJ task. Moreover, we found a detrimental effect on the untrained OD task when subjects received parietal tRNS coupled with training (Experiment one), but a benefit on OD when subjects received stimulation while at rest (Experiment two). CONCLUSIONS These results clearly indicate that task-irrelevant information is actively suppressed during learning, and that this prioritization mechanism of selection likely resides in the parietal cortex.
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Affiliation(s)
- F Contò
- Center for Neuroscience and Cognitive Systems@UniTn, Istituto Italiano di Tecnologia, Corso Bettini 31, 38068, Rovereto (TN), Italy.
| | - S Tyler
- Center for Neuroscience and Cognitive Systems@UniTn, Istituto Italiano di Tecnologia, Corso Bettini 31, 38068, Rovereto (TN), Italy; Butte College, Oroville, CA, 95965, USA
| | - P Paletta
- Center for Neuroscience and Cognitive Systems@UniTn, Istituto Italiano di Tecnologia, Corso Bettini 31, 38068, Rovereto (TN), Italy
| | - L Battelli
- Center for Neuroscience and Cognitive Systems@UniTn, Istituto Italiano di Tecnologia, Corso Bettini 31, 38068, Rovereto (TN), Italy; Department of Neurology, Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, 02215, USA; Department of Psychology, Harvard University, Cambridge, MA, 01238, USA.
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Dieme C, Ngo KA, Tyler S, Maffei JG, Zink SD, Dupuis AP, Koetzner CA, Shultis C, Stout J, Payne AF, Backenson PB, Kuo L, Drebot MA, Ciota AT, Kramer LD. Role of Anopheles Mosquitoes in Cache Valley Virus Lineage Displacement, New York, USA. Emerg Infect Dis 2022; 28:303-313. [PMID: 35075998 PMCID: PMC8798675 DOI: 10.3201/eid2802.203810] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Cache Valley virus (CVV) is a mosquitoborne virus that infects livestock and humans. We report results of surveillance for CVV in New York, USA, during 2000–2016; full-genome analysis of selected CVV isolates from sheep, horse, humans, and mosquitoes from New York and Canada; and phenotypic characterization of selected strains. We calculated infection rates by using the maximum-likelihood estimation method by year, region, month, and mosquito species. The highest maximum-likelihood estimations were for Anopheles spp. mosquitoes. Our phylogenetic analysis identified 2 lineages and found evidence of segment reassortment. Furthermore, our data suggest displacement of CVV lineage 1 by lineage 2 in New York and Canada. Finally, we showed increased vector competence of An. quadrimaculatus mosquitoes for lineage 2 strains of CVV compared with lineage 1 strains.
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Diel R, Obradovic M, Tyler S, Engelhard J, Kostev K. Real-world treatment patterns in patients with nontuberculous mycobacterial lung disease in general and pneumologist practices in Germany. J Clin Tuberc Other Mycobact Dis 2020; 20:100178. [PMID: 32802970 PMCID: PMC7419666 DOI: 10.1016/j.jctube.2020.100178] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background Nontuberculous mycobacterial lung disease (NTMLD) is a rare, progressive disease with an increasing incidence worldwide. Aims The aim of this retrospective study was to analyze the baseline characteristics and management of NTMLD in general and pneumologist practices in Germany. Methods This retrospective study included patients with a culture-confirmed diagnosis of NTMLD documented between October 1, 2014 and September 30, 2019 by 125 general practitioners (GP) and 31 office-based pulmonologists from the IMS Disease Analyzer Database (IQVIA). Results A total of 159 patients managed by German GPs (mean age 59 ± 19 years, 51% female) and 236 patients managed by pulmonologists (mean age 62 ± 14 years, 58% female) were analyzed. In total, 45% (72/159) and 40% (94/236) of patients managed by GPs and pulmonologists respectively received antibiotic therapy for NTMLD. This therapy lasted for ≥ 6 months in 42%, for ≥ 12 months in 24%, and ≥ 18 months in 8% of patients. The average therapy duration was longer in patients treated by pulmonologists (241 ± 196 days) than in patients treated by GPs (113 ± 152 days). A total of 27% of patients managed by GPs and 45% of those managed by pulmonologists respectively received guideline-based therapy (GBT), defined as combination therapy with macrolide (azi-/ clarithromycin) + ethambutol + rifabutin/rifampicin, at least once; however, almost all patients (100% in the GP group, 96% in the pulmonologist group) also received non-GBT regimens intermediately. Conclusions A considerable number of patients with NTMLD were not managed in accordance with the German guidelines and a substantial proportion also discontinue therapy prematurely. NTMLD management should be improved through appropriate referral pathways and collaboration between expert centers and primary or secondary care physicians.
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Affiliation(s)
- R Diel
- Institute for Epidemiology, University Medical Hospital Schleswig-Holstein, Kiel, Germany
| | | | - S Tyler
- Insmed Germany GmbH, Frankfurt, Germany
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Reimer A, Weedmark K, Petkau A, Peterson CL, Walker M, Knox N, Kent H, Mabon P, Berry C, Tyler S, Tschetter L, Jerome M, Allen V, Hoang L, Bekal S, Clark C, Nadon C, Van Domselaar G, Pagotto F, Graham M, Farber J, Gilmour M. Shared genome analyses of notable listeriosis outbreaks, highlighting the critical importance of epidemiological evidence, input datasets and interpretation criteria. Microb Genom 2019; 5. [PMID: 30648944 PMCID: PMC6412057 DOI: 10.1099/mgen.0.000237] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The persuasiveness of genomic evidence has pressured scientific agencies to supplement or replace well-established methodologies to inform public health and food safety decision-making. This study of 52 epidemiologically defined Listeria monocytogenes isolates, collected between 1981 and 2011, including nine outbreaks, was undertaken (1) to characterize their phylogenetic relationship at finished genome-level resolution, (2) to elucidate the underlying genetic diversity within an endemic subtype, CC8, and (3) to re-evaluate the genetic relationship and epidemiology of a CC8-delimited outbreak in Canada in 2008. Genomes representing Canadian Listeria outbreaks between 1981 and 2010 were closed and manually annotated. Single nucleotide variants (SNVs) and horizontally acquired traits were used to generate phylogenomic models. Phylogenomic relationships were congruent with classical subtyping and epidemiology, except for CC8 outbreaks, wherein the distribution of SNV and prophages revealed multiple co-evolving lineages. Chronophyletic reconstruction of CC8 evolution indicates that prophage-related genetic changes among CC8 strains manifest as PFGE subtype reversions, obscuring the relationship between CC8 isolates, and complicating the public health interpretation of subtyping data, even at maximum genome resolution. The size of the shared genome interrogated did not change the genetic relationship measured between highly related isolates near the tips of the phylogenetic tree, illustrating the robustness of these approaches for routine public health applications where the focus is recent ancestry. The possibility exists for temporally and epidemiologically distinct events to appear related even at maximum genome resolution, highlighting the continued importance of epidemiological evidence.
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Affiliation(s)
- Aleisha Reimer
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Kelly Weedmark
- 2Health Canada, Bureau of Microbial Hazards, Ottawa, ON, K1A 0K9, Canada
| | - Aaron Petkau
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | | | - Matthew Walker
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Natalie Knox
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Heather Kent
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Philip Mabon
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Chrystal Berry
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Shaun Tyler
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | | | - Morganne Jerome
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Vanessa Allen
- 3Public Health Ontario, Toronto, ON, M5G 1M1, Canada
| | - Linda Hoang
- 4British Columbia Centre for Disease Control, Public Health Microbiology and Reference Laboratory, Vancouver, BC V5Z 4R4, Canada
| | - Sadjia Bekal
- 5Laboratoire de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Québec, H9X 3R5, Canada
| | - Clifford Clark
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Celine Nadon
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | | | - Franco Pagotto
- 2Health Canada, Bureau of Microbial Hazards, Ottawa, ON, K1A 0K9, Canada
| | - Morag Graham
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
| | - Jeff Farber
- 6University of Guelph, Guelph, ON, N1G 2W, Canada
| | - Matthew Gilmour
- 1Public Health Agency of Canada, Winnipeg, MB, R3E 3R2, Canada
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5
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Tyler S, Tyson S, Dibernardo A, Drebot M, Feil EJ, Graham M, Knox NC, Lindsay LR, Margos G, Mechai S, Van Domselaar G, Thorpe HA, Ogden NH. Whole genome sequencing and phylogenetic analysis of strains of the agent of Lyme disease Borrelia burgdorferi from Canadian emergence zones. Sci Rep 2018; 8:10552. [PMID: 30002414 PMCID: PMC6043495 DOI: 10.1038/s41598-018-28908-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 06/27/2018] [Indexed: 12/19/2022] Open
Abstract
Lyme disease is emerging in southern Canada due to range expansion of the tick vector, followed by invasion of the agent of Lyme disease Borrelia burgdorferi sensu stricto. Strain diversity, as determined by Multi Locus Sequence Typing, occurs in this zone of emergence, and this may have its origins in adaptation to ecological niches, and have phenotypic consequences for pathogenicity and serological test performance. Sixty-four unique strains were cultured from ticks collected in southern Canada and the genomes sequenced using the Illumina MiSeq platform. A maximum likelihood phylogenetic tree of the chromosome revealed two large clades with multiple subclades. Consistent with previous studies on this species, the clades were not geographically defined, and some Canadian strains were highly divergent from previously sequenced US strains. There was evidence for recombination in the chromosome but this did not affect the phylogeny. Analysis of chromosomal genes indicated that these are under intense purifying selection. Phylogenies of the accessory genome and chromosome were congruent. Therefore strain differences identified in the phylogeny of chromosomal genes likely act as a proxy for genetic determinants of phenotypic differences amongst strains that are harboured in the accessory genome. Further studies on health implications of strain diversity are needed.
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Affiliation(s)
- Shaun Tyler
- Genomics Core Facility, National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, 1015, Arlington St., Winnipeg, Manitoba, Canada
| | - Shari Tyson
- Genomics Core Facility, National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, 1015, Arlington St., Winnipeg, Manitoba, Canada
| | - Antonia Dibernardo
- Zoonotic Diseases and Special Pathogens Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Michael Drebot
- Zoonotic Diseases and Special Pathogens Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Edward J Feil
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, United Kingdom
| | - Morag Graham
- Genomics Core Facility, National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, 1015, Arlington St., Winnipeg, Manitoba, Canada
| | - Natalie C Knox
- Genomics Core Facility, National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, 1015, Arlington St., Winnipeg, Manitoba, Canada
| | - L Robbin Lindsay
- Zoonotic Diseases and Special Pathogens Division, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Gabriele Margos
- Ludwig Maximilians Universität München, Department for Infectious Diseases and Zoonoses, Munich, Germany.,National Reference Centre for Borrelia, Oberschleissheim and Bavarian Health and Food Safety Authority, Oberschleissheim, Germany
| | - Samir Mechai
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, J2S 2M2, Canada
| | - Gary Van Domselaar
- Genomics Core Facility, National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, 1015, Arlington St., Winnipeg, Manitoba, Canada
| | - Harry A Thorpe
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, United Kingdom
| | - Nick H Ogden
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, J2S 2M2, Canada.
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6
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Tyler S, Truong P, Lesperance M, Nichol A, Baliski C, Warburton R, Tyldesley S. Abstract P1-11-01: The effect of close and positive surgical margins on 10-year local recurrence and survival outcomes in women treated with breast conserving surgery plus adjuvant radiotherapy. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p1-11-01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
This abstract was withdrawn by the authors.
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Affiliation(s)
- S Tyler
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
| | - P Truong
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
| | - M Lesperance
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
| | - A Nichol
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
| | - C Baliski
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
| | - R Warburton
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
| | - S Tyldesley
- British Columbia Cancer Agency, Victoria and Vancouver, BC, Canada; University of Victoria, Victoria, BC, Canada
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7
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Bonner C, Caldwell HD, Carlson JH, Graham MR, Kari L, Sturdevant GL, Tyler S, Zetner A, McClarty G. Chlamydia trachomatis virulence factor CT135 is stable in vivo but highly polymorphic in vitro. Pathog Dis 2015; 73:ftv043. [PMID: 26109550 DOI: 10.1093/femspd/ftv043] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2015] [Indexed: 11/14/2022] Open
Abstract
Chlamydia trachomatis is an important human pathogen causing both ocular and sexually transmitted disease. Recently, we identified CT135 as an important virulence determinant in a mouse infection model. Results from CEL 1 digestion assays and sequencing analyses indicated that CT135 was much more polymorphic in high in vitro passage reference serovars than it was in clinical strains that had undergone limited passaging. Herein, we used targeted next-generation sequencing of the CT134-135 locus, from reference strains and clinical isolates, enabling accurate discovery of single nucleotide polymorphisms and other population genetic variations. Our results indicate that CT134 is stable in all C. trachomatis serovars examined. In contrast, CT135 is highly polymorphic in high-passaged reference ocular and non-LGV genital serovars, with the majority of the mutations resulting in gene disruption. In low-passaged ocular clinical isolates, CT135 was frequently disrupted, whereas in genital clinical isolates CT135 was intact in almost all instances. When a serovar K isolate, with an intact CT134 and CT135, was subjected to serial passage in vitro CT134 remained invariable, while numerous gene interrupting mutations rapidly accumulated in CT135. Collectively, our data indicate that, for genital serovars, CT135 is under strong positive selection in vivo, and negative selection in vitro.
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Affiliation(s)
- Christine Bonner
- National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
| | - Harlan D Caldwell
- Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, NIH, 903 South 4 Street, Hamilton, MT 59840, USA
| | - John H Carlson
- Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, NIH, 903 South 4 Street, Hamilton, MT 59840, USA
| | - Morag R Graham
- National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
| | - Laszlo Kari
- Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, NIH, 903 South 4 Street, Hamilton, MT 59840, USA
| | - Gail L Sturdevant
- Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, NIH, 903 South 4 Street, Hamilton, MT 59840, USA
| | - Shaun Tyler
- National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
| | - Adrian Zetner
- National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada
| | - Grant McClarty
- National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E 3R2, Canada Department of Medical Microbiology, 745 Bannatyne Avenue, Winnipeg, MB R3E 0W9, Canada
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Ling L, Roy S, Meador J, Kehry M, Mekala D, Tyler S, Bulik D, Choudhury A, Markowitz L, Schultes B, Avery W, Parge V, Cochran E, King D, Kaundinya G, Manning A. THU0057 Targeting the Neonatal FC Receptor (FCRN) to Mediate Autoantibody Clearance in IgG-Driven Autoimmune Disease. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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9
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Pickering BS, Tyler S, Smith G, Burton L, Li M, Dallaire A, Weingartl H. Identification of a novel Afipia species isolated from an Indian flying fox. PLoS One 2015; 10:e0121274. [PMID: 25874801 PMCID: PMC4398416 DOI: 10.1371/journal.pone.0121274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/29/2015] [Indexed: 11/19/2022] Open
Abstract
An old world fruit bat Pteropus giganteus, held in captivity and suffering from necrosis of its wing digits, failed to respond to antibiotic therapy and succumbed to the infection. Samples submitted to the National Centre for Foreign Animal Disease were tested for viral infection. Vero E6 cells exhibited minor but unique cytopathic effects on second blind passage, and full CPE by passage four. Utilizing an unbiased random amplification technique from cell culture supernatant, we identified a bacterium belonging to the Bradyrhizobiaceae. Purification of cell culture supernatant on TY media revealed a slow growing bacterial isolate. In this study using electron microscopy, 16S rRNA gene analysis and whole genome sequencing, we identify a novel bacterial species associated with the site of infection belonging to the genus Afipia. This genus of bacteria is very diverse, with only a limited number of species characterized. Afipia felis, previously described as the etiological agent to cause cat scratch disease, and Afipia septicemium, most recently shown to cause disease in humans, highlight the potential for members of this genus to form a branch of opportunistic pathogens within the Bradyrhizobiaceae. Increased utilization of next generation sequencing and genomics will aid in classifying additional members of this intriguing bacterial genera.
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Affiliation(s)
- Brad S. Pickering
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, Canada
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Canada
- * E-mail:
| | - Shaun Tyler
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada
| | - Greg Smith
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, Canada
| | - Lynn Burton
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, Canada
| | - Mingyi Li
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, Canada
| | - André Dallaire
- Département de pathologie et microbiologie, faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Canada
| | - Hana Weingartl
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, Canada
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Canada
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Meetze K, Vincent S, Tyler S, Mazsa E, Delpero A, Bottega S, McIntosh D, Gyuris J, Weng Z. 374 Neuregulin 1 (NRG1) expression is a predictive biomarker for response to AV-203, an ERBB3 inhibitory antibody, in human tumor models. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70500-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Luo M, Tang D, La D, Capina R, Yuan XY, Correia-Pinto J, Prego C, Alonso M, Barry C, Pilon R, Daniuk C, Nykoluk M, Pillet S, Bielawny T, Tuff J, Czarnecki C, Lacap P, Wong G, Tyler S, Liang B, Yuan Z, Li Q, Ball TB, Sandstrom P, Kobinger G, Plummer F. Longitudinal Analysis of SIVmac239 Mutations around the 12 Protease Cleavage Sites and their Correlations with Viral Load Reduction and CD4 counts. AIDS Res Hum Retroviruses 2014. [DOI: 10.1089/aid.2014.5546.abstract] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ma Luo
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
- University of Manitoba, Medical Microbiology, Winnipeg, MB, Canada
| | - David Tang
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - David La
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Rupert Capina
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Xin-Yang Yuan
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | | | - Cecilia Prego
- University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Maria Alonso
- University of Santiago de Compostela, Santiago de Compostela, Spain
| | | | - Richard Pilon
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Christina Daniuk
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Mikaela Nykoluk
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | | | - Tomasz Bielawny
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Jeffrey Tuff
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Chris Czarnecki
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Philip Lacap
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Gary Wong
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Shaun Tyler
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Ben Liang
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Zhe Yuan
- University of Nebraska-Lincoln, Nebraska-Lincoln, NE, United States
| | - Qingsheng Li
- University of Nebraska-Lincoln, Nebraska-Lincoln, NE, United States
| | - Terry Blake Ball
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Paul Sandstrom
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Gary Kobinger
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Francis Plummer
- University of Manitoba, Medical Microbiology, Winnipeg, MB, Canada
- National Microbiology Laboratory, Winnipeg, MB, Canada
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12
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Tang D, La D, Capina R, Yuan XY, Correia-Pinto J, Prego C, Alonso M, Barry C, Pilon R, Daniuk C, Nykoluk M, Pillet S, Bielawny T, Tuff J, Czarnecki C, Lacap P, Wong G, Tyler S, Liang B, Yuan Z, Li Q, Ball TB, Sandstrom P, Kobinger G, Plummer F, Luo M. Sequences Surrounding the 12 Protease Cleavage Sites are Good Targets for Both Prophylactic and Therapeutic HIV Vaccines. AIDS Res Hum Retroviruses 2014. [DOI: 10.1089/aid.2014.5547.abstract] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- David Tang
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - David La
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Rupert Capina
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Xin-Yang Yuan
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | | | - Cecilia Prego
- University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Maria Alonso
- University of Santiago de Compostela, Santiago de Compostela, Spain
| | | | - Richard Pilon
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Christina Daniuk
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Mikaela Nykoluk
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | | | - Tomasz Bielawny
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Jeffrey Tuff
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Chris Czarnecki
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Philip Lacap
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Gary Wong
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Shaun Tyler
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Ben Liang
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Zhe Yuan
- University of Nebraska-Lincoln, Nebraska-Lincoln, NE, United States
| | - Qingsheng Li
- University of Nebraska-Lincoln, Nebraska-Lincoln, NE, United States
| | - Terry Blake Ball
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Paul Sandstrom
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
| | - Gary Kobinger
- National Microbiology Laboratory, Winnipeg, MB, Canada
| | - Francis Plummer
- National Microbiology Laboratory, Winnipeg, MB, Canada
- University of Manitoba, Medical Microbiology, Winnipeg, MB, Canada
| | - Ma Luo
- National Microbiology Laboratory, National HIV and Retrovirology Laboratory, Winnipeg, MB, Canada
- University of Manitoba, Medical Microbiology, Winnipeg, MB, Canada
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Dasgupta S, Tyler S, Srinivasan R, Grossman E. Functional Connectivity of Co-localized Brain Regions during Biological Motion, Face and Social Perception using Partial Correlation Analysis. J Vis 2014. [DOI: 10.1167/14.10.1011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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14
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Black D, Ohsawa K, Tyler S, Maxwell L, Eberle R. A single viral gene determines lethal cross-species neurovirulence of baboon herpesvirus HVP2. Virology 2014; 452-453:86-94. [PMID: 24606686 DOI: 10.1016/j.virol.2013.12.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 11/25/2013] [Accepted: 12/27/2013] [Indexed: 11/24/2022]
Abstract
Alpha-herpesviruses can produce more severe infections in non-natural host species than in their natural host. Isolates of the baboon alpha-herpesvirus Papiine herpesvirus 2 (HVP2) are either very neurovirulent in mice (subtype nv) or non-virulent (subtype ap), but no such difference is evident in the natural baboon host. Comparative genome sequencing was used to identify subtype-specific sequence differences (SSDs) between HVP2nv and HVP2ap isolates. Some genes were identified that despite exhibiting sequence variation among isolates did not have any SSDs, while other genes had comparatively high levels of SSDs. Construction of genomic recombinants between HVP2nv and HVP2ap isolates mapped the mouse neurovirulence determinant to within three genes. Construction of gene-specific recombinants demonstrated that the UL39 ORF is responsible for determining the lethal neurovirulence phenotype of HVP2 in mice. These results demonstrate that differences in a single viral gene can determine the severity of herpesvirus infection in a non-natural host species.
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Affiliation(s)
- Darla Black
- Department of Veterinary Pathobiology, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, United States
| | - Kazutaka Ohsawa
- Center for Frontier Life Sciences, Division of Comparative Medicine, Nagasaki University, Nagasaki, Japan
| | - Shaun Tyler
- National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, Winnipeg, Canada R3E 3P6
| | - Lara Maxwell
- Department of Physiological Sciences, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, United States
| | - R Eberle
- Department of Veterinary Pathobiology, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, United States.
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Agosta S, Herpich F, Ferraro F, Miceli G, Tyler S, Grossman E, Battelli L. Stimulation of the left parietal lobe improves spatial and temporal attention in right parietal lobe patients: tipping the inter-hemispheric balance with TMS. J Vis 2013. [DOI: 10.1167/13.9.287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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16
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Battelli L, Herpich F, Tyler S, Grossman E, Agosta S. Right hemisphere dominance in temporal attention: a TMS study. J Vis 2013. [DOI: 10.1167/13.9.1199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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17
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Grossman E, Tyler S, Dasgupta S, Hecker E, Garcia J. A data-driven approach to functional selectivity on the STS. J Vis 2013. [DOI: 10.1167/13.9.184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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18
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Ji H, Liang B, Li Y, Van Domselaar G, Graham M, Tyler S, Merks H, Sandstrom P, Brooks J. Low abundance drug resistance variants in transmitted HIV drug resistance surveillance specimens identified using tagged pooled pyrosequencing. J Virol Methods 2013; 187:314-20. [DOI: 10.1016/j.jviromet.2012.10.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 10/10/2012] [Accepted: 10/22/2012] [Indexed: 01/23/2023]
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19
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Grossman E, Kim E, Hecker E, Tyler S. The temporal structure of social reflexive orienting from point-light biological motion. J Vis 2012. [DOI: 10.1167/12.9.467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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20
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Ping J, Selman M, Tyler S, Forbes N, Keleta L, Brown EG. Low-pathogenic avian influenza virus A/turkey/Ontario/6213/1966 (H5N1) is the progenitor of highly pathogenic A/turkey/Ontario/7732/1966 (H5N9). J Gen Virol 2012; 93:1649-1657. [PMID: 22592261 DOI: 10.1099/vir.0.042895-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The first confirmed outbreak of highly pathogenic avian influenza (HPAI) virus infections in North America was caused by A/turkey/Ontario/7732/1966 (H5N9); however, the phylogeny of this virus is largely unknown. This study performed genomic sequence analysis of 11 avian influenza isolates from 1956 to 1979 for comparison with A/turkey/Ontario/7732/1966 (H5N9). Phylogenetic and genetic analyses included these viruses in combination with all known full-genome sequences of avian viruses isolated before 1981. It was shown that a low-pathogenic avian influenza virus, A/turkey/Ontario/6213/1966 (H5N1), that had been isolated 3 months previously, was the closest known genetic relative with six genome segments of common lineage encoding the polymerase subunits PB2, PB1 and PA, nucleoprotein (NP), haemagglutinin (HA) and non-structural (NS) proteins. The lineages of these genome segments included reassortment with other North American turkey viruses that were all rooted in North American wild waterfowl with the HA gene originating from the H5N2 serotype. The phylogenies demonstrated adaptation from North American wild birds to turkeys with the possible involvement of domestic waterfowl. The turkey isolate, A/turkey/Wisconsin/1968 (H5N9), was the second most closely related poultry isolate to A/turkey/Ontario/7732/1966 (H5N9), possessing five common lineage genome segments (PB2, PB1, PA, HA and neuraminidase). The A/turkey/Ontario/6213/1966 (H5N1) virus was more virulent than A/turkey/Wisconsin/68 (H5N9) for chicken embryos and mice, indicating a greater biological similarity to A/turkey/Ontario/7732/1966 (H5N9). Thus, A/turkey/Ontario/6213/1966 (H5N1) was identified as the closest known ancestral relative of HPAI A/turkey/Ontario/7732/1966 (H5N9), which will serve as a useful reference virus for characterizing the early genetic and biological properties associated with the emergence of pathogenic avian influenza strains.
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Affiliation(s)
- Jihui Ping
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario, Canada.,Emerging Pathogens Research Centre, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada.,Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada
| | - Mohammed Selman
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario, Canada.,Emerging Pathogens Research Centre, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada.,Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada
| | - Shaun Tyler
- National Microbiology Laboratory, Public Health Agency of Canada, Canadian Science Centre for Human and Animal Health, Winnipeg, Canada
| | - Nicole Forbes
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario, Canada.,Emerging Pathogens Research Centre, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada.,Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada
| | - Liya Keleta
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario, Canada.,Emerging Pathogens Research Centre, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada.,Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada
| | - Earl G Brown
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario, Canada.,Emerging Pathogens Research Centre, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada.,Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, Ontario K1H 8M5, Canada
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21
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Reed DL, Currier RW, Walton SF, Conrad M, Sullivan SA, Carlton JM, Read TD, Severini A, Tyler S, Eberle R, Johnson WE, Silvestri G, Clarke IN, Lagergård T, Lukehart SA, Unemo M, Shafer WM, Beasley RP, Bergström T, Norberg P, Davison AJ, Sharp PM, Hahn BH, Blomberg J. The evolution of infectious agents in relation to sex in animals and humans: brief discussions of some individual organisms. Ann N Y Acad Sci 2011; 1230:74-107. [PMID: 21824167 DOI: 10.1111/j.1749-6632.2011.06133.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The following series of concise summaries addresses the evolution of infectious agents in relation to sex in animals and humans from the perspective of three specific questions: (1) what have we learned about the likely origin and phylogeny, up to the establishment of the infectious agent in the genital econiche, including the relative frequency of its sexual transmission; (2) what further research is needed to provide additional knowledge on some of these evolutionary aspects; and (3) what evolutionary considerations might aid in providing novel approaches to the more practical clinical and public health issues facing us currently and in the future?
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Affiliation(s)
- David L Reed
- Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA
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22
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Tyler S, Bolling BG, Blair CD, Brault AC, Pabbaraju K, Armijos MV, Clark DC, Calisher CH, Drebot MA. Distribution and phylogenetic comparisons of a novel mosquito flavivirus sequence present in Culex tarsalis Mosquitoes from western Canada with viruses isolated in California and Colorado. Am J Trop Med Hyg 2011; 85:162-8. [PMID: 21734143 DOI: 10.4269/ajtmh.2011.10-0469] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
In a previous study, a new flavivirus genome sequence was identified in Culex tarsalis mosquitoes obtained in Alberta, Canada and was shown to be genetically related to but distinct from members of the insect-specific flaviviruses. Nonstructural protein 5-encoding sequences amplified from Cx. tarsalis pools from western Canada have shown a high similarity to genome sequences of novel flaviviruses isolated from mosquitoes in California and Colorado. Despite wide distribution of this virus, designated Calbertado virus, strains demonstrate a high degree of nonstructural protein 5 nucleotide (> 90%) and amino acid (> 97%) identity. The ecology and geographic range of Calbertado virus warrants further study because it may potentially influence transmission of mosquito-borne flaviviruses, including important human pathogens such as West Nile and Saint Louis encephalitis viruses.
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Affiliation(s)
- Shaun Tyler
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
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23
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Ping J, Keleta L, Forbes NE, Dankar S, Stecho W, Tyler S, Zhou Y, Babiuk L, Weingartl H, Halpin RA, Boyne A, Bera J, Hostetler J, Fedorova NB, Proudfoot K, Katzel DA, Stockwell TB, Ghedin E, Spiro DJ, Brown EG. Genomic and protein structural maps of adaptive evolution of human influenza A virus to increased virulence in the mouse. PLoS One 2011; 6:e21740. [PMID: 21738783 PMCID: PMC3128085 DOI: 10.1371/journal.pone.0021740] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 06/10/2011] [Indexed: 12/11/2022] Open
Abstract
Adaptive evolution is characterized by positive and parallel, or repeated selection of mutations. Mouse adaptation of influenza A virus (IAV) produces virulent mutants that demonstrate positive and parallel evolution of mutations in the hemagglutinin (HA) receptor and non-structural protein 1 (NS1) interferon antagonist genes. We now present a genomic analysis of all 11 genes of 39 mouse adapted IAV variants from 10 replicate adaptation experiments. Mutations were mapped on the primary and structural maps of each protein and specific mutations were validated with respect to virulence, replication, and RNA polymerase activity. Mouse adapted (MA) variants obtained after 12 or 20–21 serial infections acquired on average 5.8 and 7.9 nonsynonymous mutations per genome of 11 genes, respectively. Among a total of 115 nonsynonymous mutations, 51 demonstrated properties of natural selection including 27 parallel mutations. The greatest degree of parallel evolution occurred in the HA receptor and ribonucleocapsid components, polymerase subunits (PB1, PB2, PA) and NP. Mutations occurred in host nuclear trafficking factor binding sites as well as sites of virus-virus protein subunit interaction for NP, NS1, HA and NA proteins. Adaptive regions included cap binding and endonuclease domains in the PB2 and PA polymerase subunits. Four mutations in NS1 resulted in loss of binding to the host cleavage and polyadenylation specificity factor (CPSF30) suggesting that a reduction in inhibition of host gene expression was being selected. The most prevalent mutations in PB2 and NP were shown to increase virulence but differed in their ability to enhance replication and demonstrated epistatic effects. Several positively selected RNA polymerase mutations demonstrated increased virulence associated with >300% enhanced polymerase activity. Adaptive mutations that control host range and virulence were identified by their repeated selection to comprise a defined model for studying IAV evolution to increased virulence in the mouse.
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Affiliation(s)
- Jihui Ping
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Emerging Pathogens Research Centre, University of Ottawa, Ottawa, Ontario, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - Liya Keleta
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Emerging Pathogens Research Centre, University of Ottawa, Ottawa, Ontario, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - Nicole E. Forbes
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Emerging Pathogens Research Centre, University of Ottawa, Ottawa, Ontario, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - Samar Dankar
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Emerging Pathogens Research Centre, University of Ottawa, Ottawa, Ontario, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - William Stecho
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Emerging Pathogens Research Centre, University of Ottawa, Ottawa, Ontario, Canada
| | - Shaun Tyler
- National Microbiology Laboratory, Canadian Science Centre for Human and Animal Health, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Yan Zhou
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - Lorne Babiuk
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - Hana Weingartl
- National Centre for Foreign Animal Disease, Canadian Food Inspection Agency, Winnipeg, Manitoba, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
| | - Rebecca A. Halpin
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Alex Boyne
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Jayati Bera
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Jessicah Hostetler
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Nadia B. Fedorova
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Katie Proudfoot
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Dan A. Katzel
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Tim B. Stockwell
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Elodie Ghedin
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
- Center for Vaccine Research, Department of Computational and Systems Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States of America
| | - David J. Spiro
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
- Viral Genomics Group, J. Craig Venter Institute, Rockville, Maryland, United States of America
| | - Earl G. Brown
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
- Emerging Pathogens Research Centre, University of Ottawa, Ottawa, Ontario, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
- Canadian Institutes of Health Research (CIHR) Canadian Influenza Pathogenesis Team, University of Ottawa, Ottawa, Ontario, Canada
- * E-mail:
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Tyler S, Severini A, Black D, Walker M, Eberle R. Structure and sequence of the saimiriine herpesvirus 1 genome. Virology 2011; 410:181-91. [PMID: 21130483 PMCID: PMC3017652 DOI: 10.1016/j.virol.2010.11.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 10/25/2010] [Accepted: 11/03/2010] [Indexed: 01/24/2023]
Abstract
We report here the complete genome sequence of the squirrel monkey α-herpesvirus saimiriine herpesvirus 1 (HVS1). Unlike the simplexviruses of other primate species, only the unique short region of the HVS1 genome is bounded by inverted repeats. While all Old World simian simplexviruses characterized to date lack the herpes simplex virus RL1 (γ34.5) gene, HVS1 has an RL1 gene. HVS1 lacks several genes that are present in other primate simplexviruses (US8.5, US10-12, UL43/43.5 and UL49A). Although the overall genome structure appears more like that of varicelloviruses, the encoded HVS1 proteins are most closely related to homologous proteins of the primate simplexviruses. Phylogenetic analyses confirm that HVS1 is a simplexvirus. Limited comparison of two HVS1 strains revealed a very low degree of sequence variation more typical of varicelloviruses. HVS1 is thus unique among the primate α-herpesviruses in that its genome has properties of both simplexviruses and varicelloviruses.
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Affiliation(s)
- Shaun Tyler
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada
| | - Alberto Severini
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada
- Dept. of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, MB, Canada
| | - Darla Black
- Dept. of Veterinary Pathobiology, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, USA
| | - Matthew Walker
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada
| | - R. Eberle
- Dept. of Veterinary Pathobiology, Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK, USA
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Graham M, Liang B, Van Domselaar G, Bastien N, Beaudoin C, Tyler S, Kaplen B, Landry E, Li Y. Nationwide molecular surveillance of pandemic H1N1 influenza A virus genomes: Canada, 2009. PLoS One 2011; 6:e16087. [PMID: 21249207 PMCID: PMC3017559 DOI: 10.1371/journal.pone.0016087] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2010] [Accepted: 12/06/2010] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND In April 2009, a novel triple-reassortant swine influenza A H1N1 virus ("A/H1N1pdm"; also known as SOIV) was detected and spread globally as the first influenza pandemic of the 21(st) century. Sequencing has since been conducted at an unprecedented rate globally in order to monitor the diversification of this emergent virus and to track mutations that may affect virus behavior. METHODOLOGY/PRINCIPAL FINDINGS By Sanger sequencing, we determined consensus whole-genome sequences for A/H1N1pdm viruses sampled nationwide in Canada over 33 weeks during the 2009 first and second pandemic waves. A total of 235 virus genomes sampled from unique subjects were analyzed, providing insight into the temporal and spatial trajectory of A/H1N1pdm lineages within Canada. Three clades (2, 3, and 7) were identifiable within the first two weeks of A/H1N1pdm appearance, with clades 5 and 6 appearing thereafter; further diversification was not apparent. Only two viral sites displayed evidence of adaptive evolution, located in hemagglutinin (HA) corresponding to D222 in the HA receptor-binding site, and to E374 at HA2-subunit position 47. Among the Canadian sampled viruses, we observed notable genetic diversity (1.47 x 10⁻³ amino acid substitutions per site) in the gene encoding PB1, particularly within the viral genomic RNA (vRNA)-binding domain (residues 493-757). This genome data set supports the conclusion that A/H1N1pdm is evolving but not excessively relative to other H1N1 influenza A viruses. Entropy analysis was used to investigate whether any mutated A/H1N1pdm protein residues were associated with infection severity; however no virus genotypes were observed to trend with infection severity. One virus that harboured heterozygote coding mutations, including PB2 D567D/G, was attributed to a severe and potentially mixed infection; yet the functional significance of this PB2 mutation remains unknown. CONCLUSIONS/SIGNIFICANCE These findings contribute to enhanced understanding of Influenza A/H1N1pdm viral dynamics.
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Affiliation(s)
- Morag Graham
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada.
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26
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Ji H, Li Y, Graham M, Liang BB, Pilon R, Tyson S, Peters G, Tyler S, Merks H, Bertagnolio S, Soto-Ramirez L, Sandstrom P, Brooks J. Next-generation sequencing of dried blood spot specimens: a novel approach to HIV drug-resistance surveillance. Antivir Ther 2011; 16:871-8. [DOI: 10.3851/imp1839] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Tyler S, Garcia JO, Grossman ED. Attention-based motion analysis of biological motion perception. J Vis 2010. [DOI: 10.1167/10.7.790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Golding GR, Bryden L, Levett PN, McDonald RR, Wong A, Wylie J, Graham MR, Tyler S, Van Domselaar G, Simor AE, Gravel D, Mulvey MR. Livestock-associated methicillin-resistant Staphylococcus aureus sequence type 398 in humans, Canada. Emerg Infect Dis 2010; 16:587-94. [PMID: 20350371 PMCID: PMC3321955 DOI: 10.3201/eid1604.091435] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Recent emergence of infections resulting from this strain is of public health concern. Rates of colonization with livestock-associated methicillin-resistant Staphylococcus aureus (MRSA) sequence type 398 have been high for pigs and pig farmers in Canada, but prevalence rates for the general human population are unknown. In this study, 5 LA-MRSA isolates, 4 of which were obtained from skin and soft tissue infections, were identified from 3,687 tested MRSA isolates from persons in Manitoba and Saskatchewan, Canada. Further molecular characterization determined that these isolates all contained staphylococcal cassette chromosome (SCC) mecV, were negative for Panton-Valentine leukocidin, and were closely related by macrorestriction analysis with the restriction enzyme Cfr91. The complete DNA sequence of the SCCmec region from the isolate showed a novel subtype of SCCmecV harboring clustered regularly interspaced short palindromic repeats and associated genes. Although prevalence of livestock-associated MRSA seems to be low for the general population in Canada, recent emergence of infections resulting from this strain is of public health concern.
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Bastien N, Antonishyn NA, Brandt K, Wong CE, Chokani K, Vegh N, Horsman GB, Tyler S, Graham MR, Plummer FA, Levett PN, Li Y. Human infection with a triple-reassortant swine influenza A(H1N1) virus containing the hemagglutinin and neuraminidase genes of seasonal influenza virus. J Infect Dis 2010; 201:1178-82. [PMID: 20199242 DOI: 10.1086/651507] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
A reassortant influenza A(H1N1) virus of swine origin distinct from the pandemic H1N1 2009 strain was isolated from 3 patients, all of whom worked at the same large hog operation in Saskatchewan, Canada. The genomic composition of the isolates has not been previously reported, to our knowledge, and was the product of a genetic reassortment between seasonal H1N1 and triple-reassortant influenza virus that emerged in North American swine during the late 1990s. The neuraminidase and hemagglutinin genes of A/Saskatchewan/5350/2009, A/Saskatchewan/5351/2009, and A/Saskatchewan/5131/2009 were derived from human H1N1 virus and were closely related to those of A/Brisbane/59/2007.
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Affiliation(s)
- Nathalie Bastien
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada
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Gilmour MW, Graham M, Van Domselaar G, Tyler S, Kent H, Trout-Yakel KM, Larios O, Allen V, Lee B, Nadon C. High-throughput genome sequencing of two Listeria monocytogenes clinical isolates during a large foodborne outbreak. BMC Genomics 2010; 11:120. [PMID: 20167121 PMCID: PMC2834635 DOI: 10.1186/1471-2164-11-120] [Citation(s) in RCA: 234] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Accepted: 02/18/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A large, multi-province outbreak of listeriosis associated with ready-to-eat meat products contaminated with Listeria monocytogenes serotype 1/2a occurred in Canada in 2008. Subtyping of outbreak-associated isolates using pulsed-field gel electrophoresis (PFGE) revealed two similar but distinct AscI PFGE patterns. High-throughput pyrosequencing of two L. monocytogenes isolates was used to rapidly provide the genome sequence of the primary outbreak strain and to investigate the extent of genetic diversity associated with a change of a single restriction enzyme fragment during PFGE. RESULTS The chromosomes were collinear, but differences included 28 single nucleotide polymorphisms (SNPs) and three indels, including a 33 kbp prophage that accounted for the observed difference in AscI PFGE patterns. The distribution of these traits was assessed within further clinical, environmental and food isolates associated with the outbreak, and this comparison indicated that three distinct, but highly related strains may have been involved in this nationwide outbreak. Notably, these two isolates were found to harbor a 50 kbp putative mobile genomic island encoding translocation and efflux functions that has not been observed in other Listeria genomes. CONCLUSIONS High-throughput genome sequencing provided a more detailed real-time assessment of genetic traits characteristic of the outbreak strains than could be achieved with routine subtyping methods. This study confirms that the latest generation of DNA sequencing technologies can be applied during high priority public health events, and laboratories need to prepare for this inevitability and assess how to properly analyze and interpret whole genome sequences in the context of molecular epidemiology.
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Affiliation(s)
- Matthew W Gilmour
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, MB, Canada.
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Ziegler J, Walker M, Tyler S, Trout K, Wylie J, Louie M, Gilmour M. P191 A comparative genomic analysis of invasive clinical isolates of Salmonella enterica serovar Oranienburg. Int J Antimicrob Agents 2009. [DOI: 10.1016/s0924-8579(09)70410-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Pabbaraju K, Ho KCY, Wong S, Fox JD, Kaplen B, Tyler S, Drebot M, Tilley PAG. Surveillance of mosquito-borne viruses in Alberta using reverse transcription polymerase chain reaction with generic primers. J Med Entomol 2009; 46:640-648. [PMID: 19496438 DOI: 10.1603/033.046.0332] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Mosquitoes collected during 2003, 2004, and 2005 in Alberta, Canada, were screened for the presence of a wide range of arboviruses by reverse transcription-polymerase chain reaction (RT-PCR). Nucleic acid extracts from mosquito slurries were amplified using universal primers designed to detect viruses belonging to the Flavivirus genus of the Flaviviridae family and California and Bunyamwera serogroups of the Bunyavirus genus within the Bunyaviridae family. Species-specific detection of Western equine encephalitis virus and Eastern equine encephalitis virus was also performed. Amplified products were analyzed, and the viral target was identified by sequencing. Of the 418 pools tested, 3 pools contained Cache Valley virus belonging to Bunyaviridae and 103 pools were positive for a previously undescribed flaviviral sequence that was most similar to Kamiti River virus. These data suggest that nucleic acid amplification using broadly reactive primers can be adopted for arbovirus surveillance in mosquito populations, and this approach has the potential to detect both previously recognized and novel viruses.
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Affiliation(s)
- Kanti Pabbaraju
- Provincial Laboratory for Public Health (Microbiology), Calgary site, 3030 Hospital Drive, Calgary, Alberta, Canada T2N 4W4.
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Tsang RSW, Tsai CM, Henderson AM, Tyler S, Law DKS, Zollinger W, Jamieson F. Immunochemical studies and genetic background of two Neisseria meningitidis isolates expressing unusual capsule polysaccharide antigens with specificities of both serogroup Y and W135. Can J Microbiol 2008; 54:229-34. [PMID: 18388994 DOI: 10.1139/w07-132] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We described 2 unusual Neisseria meningitidis strains isolated from epidemiologically unrelated invasive meningococcal disease cases in Ontario, Canada. Both isolates have features typical of serogroup Y N. meningitidis: are of serotype 2c, are of the multi-locus sequence types typical of the serogroup Y strains in Canada, and are genotyped as serogroup Y based on a previously described PCR-ELISA method that detects the serogroup-Y-specific siaD gene. However, both strains were poly-agglutinable in both anti-Y and anti-W135 antisera. Further studies on 1 of these 2 isolates showed the presence of glucose and galactose as well as sialic acids in its purified capsular polysaccharide, suggesting the presence of both serogroup Y and serogroup W135 polysaccharides. Rabbit antisera produced to this strain contained antibodies to both purified serogroup Y and serogroup W135 capsular polysaccharides. Absorption experiments with either serogroup Y or serogroup W135 bacteria confirmed the presence of antibodies to these 2 different polysaccharides. DNA sequencing of the cps operon from both isolates revealed a siaD gene with 99.7% homology to the published siaD sequence from a serogroup Y strain but with 3 point mutations that all resulted in amino acid changes. How these strains may affect results of routine surveillance, PCR diagnosis, and immuno-protection by vaccination are discussed.
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Affiliation(s)
- Raymond S W Tsang
- Laboratory for Vaccine Preventable Bacterial Diseases, National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, MB R3E3R2, Canada.
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Chan KY, Dorahy C, Tyler S. Determining the agronomic value of composts produced from garden organics from metropolitan areas of New South Wales, Australia. ACTA ACUST UNITED AC 2007. [DOI: 10.1071/ea06128] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
About 0.3 million t/year of composted garden organics (CGO) including mulches and soil conditioners are produced annually in New South Wales, Australia, although only a small proportion of this material (<4%) is used in agriculture. A lack of information on product characteristics and agronomic performance has limited the development of agricultural markets for CGO products. These CGO products are the coarse and fine fractions separated by screening after composting. This paper presents the results of a survey of CGO mulches and soil conditioners (unblended or blended with a mixture of other organic materials including biosolids, animal manures and paper), which are commercially produced in the metropolitan areas of New South Wales and assesses their agronomic and soil amendment values in terms of chemical and biological properties. It also evaluates the short-term effects of applying increasing rates (0, 25, 50 and 100 t/ha) of selected composted soil conditioners on radish growth in a pot experiment. The mulch products had low nutrient concentrations but had high carbon (C) contents (mean C = 45%) and C/Nitrogen (N) ratios (mean C/N = 72) and are most suitable for use as surface mulch. The unblended soil conditioners were low in nutrients, particularly N (average total N = 1.0%, range 0.9–12%), and had lower and variable C contents. The pot trial results indicated lack of growth response of radish at application rates up to 100 t/ha of unblended soil conditioners from garden organics. The blended soil conditioners were more variable in quality and as confirmed by pot trial results produced highly variable plant responses. The high variability in product quality and performance of the soil conditioners, particularly the blended products might be related to the source and type of blending material as well as the composting conditions used in the manufacturing process. These results highlight the need to improve compost quality and consistency and the need for further research to advance understanding of the benefits using CGO in terms of improving soil quality, crop productivity and net economic returns to growers.
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Dawbarn D, Fahey M, Watson J, Tyler S, Shoemark D, Sessions R, Zhang R, Brady L, Willis C, Allen SJ. NGF receptor TrkAd5: therapeutic agent and drug design target. Biochem Soc Trans 2006; 34:587-90. [PMID: 16856868 DOI: 10.1042/bst0340587] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Biochemical studies have shown that domain 5 of the TrkA (tropomyosin receptor kinase A) receptor is involved in the binding of NGF (nerve growth factor). Crystallographic studies have confirmed this, demonstrating that one homodimer of NGF binds to two TrkAd5 molecules. TrkAd5 has been made recombinantly in Escherichia coli, purified and shown to bind NGF with picomolar affinity. We have used the co-ordinates of the crystal structure of the NGF-TrkAd5 complex to screen approximately two million compounds in silico for the identification of small molecule agonists/antagonists. Selected hits were shown to be active in an in vitro ligand-binding assay; structure-activity relationships are now being investigated. In addition, TrkAd5 has been shown to be efficacious in preclinical models of inflammatory pain and asthma by the sequestration of excess levels of endogenous NGF, and therefore represents a novel therapeutic agent.
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Affiliation(s)
- D Dawbarn
- Department of Medicine, University of Bristol, Bristol BS1 3NY, UK.
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37
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Boyd DA, Du T, Hizon R, Kaplen B, Murphy T, Tyler S, Brown S, Jamieson F, Weiss K, Mulvey MR. VanG-type vancomycin-resistant Enterococcus faecalis strains isolated in Canada. Antimicrob Agents Chemother 2006; 50:2217-21. [PMID: 16723588 PMCID: PMC1479100 DOI: 10.1128/aac.01541-05] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Enterococcus faecalis G1-0247 (vancomycin MIC, 16 microg/ml) was found to harbor a vanG operon 99% identical to the vanG operon in E. faecalis BM4518. E. faecalis N03-0233 (vancomycin MIC, 16 microg/ml) was found to harbor a novel vanG operon, vanG2, on an element in a different chromosomal location than the vanG-harboring elements in G1-0247 and BM4518.
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Affiliation(s)
- David A Boyd
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba
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He R, Leeson A, Ballantine M, Andonov A, Baker L, Dobie F, Li Y, Bastien N, Feldmann H, Strocher U, Theriault S, Cutts T, Cao J, Booth TF, Plummer FA, Tyler S, Li X. Characterization of protein-protein interactions between the nucleocapsid protein and membrane protein of the SARS coronavirus. Virus Res 2005; 105:121-5. [PMID: 15351485 PMCID: PMC7127797 DOI: 10.1016/j.virusres.2004.05.002] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2004] [Revised: 05/07/2004] [Accepted: 05/10/2004] [Indexed: 02/04/2023]
Abstract
The human coronavirus, associated with severe acute respiratory syndrome (SARS-CoV), was identified and molecularly characterized in 2003. Sequence analysis of the virus indicates that there is only 20% amino acid (aa) identity with known coronaviruses. Previous studies indicate that protein-protein interactions amongst various coronavirus proteins are critical for viral assembly. Yet, little sequence homology between the newly identified SARS-CoV and those previously studied coronaviruses suggests that determination of protein-protein interaction and identification of amino acid sequences, responsible for such interaction in SARS-CoV, are necessary for the elucidation of the molecular mechanism of SARS-CoV replication and rationalization of anti-SARS therapeutic intervention. In this study, we employed mammalian two-hybrid system to investigate possible interactions between SARS-CoV nucleocapsid (N) and the membrane (M) proteins. We found that interaction of the N and M proteins takes place in vivo and identified that a stretch of amino acids (168-208) in the N protein may be critical for such protein-protein interactions. Importantly, the same region has been found to be required for multimerization of the N protein (He et al., 2004) suggesting this region may be crucial in maintaining correct conformation of the N protein for self-interaction and interaction with the M protein.
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Affiliation(s)
- Runtao He
- National Microbiology Laboratory, Health Canada, 1015 Arlington St., Winnipeg, Man., Canada R3E 3R2.
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40
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Hoang LMN, Thomas E, Tyler S, Pollard AJ, Stephens G, Gustafson L, McNabb A, Pocock I, Tsang R, Tan R. Rapid and Fatal Meningococcal Disease Due to a Strain of Neisseria meningitidis Containing the Capsule Null Locus. Clin Infect Dis 2005; 40:e38-42. [PMID: 15714405 DOI: 10.1086/427875] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2004] [Accepted: 11/08/2004] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Neisseria meningitidis continues to be an important cause of invasive bacterial disease among children and young adults worldwide. In Canada, N. meningitidis strains that bear serogroups B and C polysaccharide capsules predominate. We report the first documented case of invasive meningococcal disease in an immunocompetent host caused by an acapsular strain of N. meningitidis containing the capsule null locus (cnl). METHODS Analysis of the isolate was performed with use of serological and molecular methods, including multilocus sequence typing and cnl gene identification. Analysis of 16S ribosomal RNA (rRNA) and porA genes was also performed to confirm the identity of the bacterium. RESULTS The patient was a healthy, immunocompetent 13-year-old child, and N. meningitidis was recovered from a sample of her cerebrospinal fluid before death. The isolate was nontypeable by both conventional antisera and indirect whole-cell enzyme-linked immuosorbent assay methods using antibodies to serogroups B, C, Y, and W135. The isolate was further identified as a cnl strain, serotype 15 (ST-198). N. meningitidis-specific DNA was identified in the isolate and in the pre- and postmortem specimens by 16S rRNA and porA gene analysis. CONCLUSIONS This is the first reported case of fatal meningococcal disease caused by an acapsular cnl strain of N. meningitidis that was isolated from an immunocompetent host. Routine molecular diagnostic methods targeted at the cnl locus failed to detect this organism, indicating a need to determine the incidence of infection with cnl strains among patients with culture-negative invasive disease.
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Affiliation(s)
- Linda M N Hoang
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
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41
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Lenton R, Tyler S, Tropp H. Workshop 8 (synthesis): water governance--a key driver for food and urban security. Water Sci Technol 2005; 51:175. [PMID: 16007946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Water governance has profound impact on the livelihoods of urban and rural people and on environmental sustainability. Yet governance has not received the same attention as technical issues. Governance is about processes of choices, decisions and estimating trade-offs.
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Affiliation(s)
- R Lenton
- The Earth Institute at Columbia University, Lamont Hall, 61 Route 9W, Palisades, NY 10964, USA.
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Baucheron S, Tyler S, Boyd D, Mulvey MR, Chaslus-Dancla E, Cloeckaert A. AcrAB-TolC directs efflux-mediated multidrug resistance in Salmonella enterica serovar typhimurium DT104. Antimicrob Agents Chemother 2004; 48:3729-35. [PMID: 15388427 PMCID: PMC521921 DOI: 10.1128/aac.48.10.3729-3735.2004] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Multidrug-resistant Salmonella enterica serovar Typhimurium definitive phage type 104 (DT104) strains harbor a genomic island, called Salmonella genomic island 1 (SGI1), which contains an antibiotic resistance gene cluster conferring resistance to ampicillin, chloramphenicol, florfenicol, streptomycin, sulfonamides, and tetracyclines. They may be additionally resistant to quinolones. Among the antibiotic resistance genes there are two, i.e., floR and tet(G), which code for efflux pumps of the major facilitator superfamily with 12 transmembrane segments that confer resistance to chloramphenicol-florfenicol and the tetracyclines, respectively. In the present study we determined, by constructing acrB and tolC mutants, the role of the AcrAB-TolC multidrug efflux system in the multidrug resistance of several DT104 strains displaying additional quinolone resistance or not displaying quinolone resistance. This study shows that the quinolone resistance and the decreased fluoroquinolone susceptibilities of the strains are highly dependent on the AcrAB-TolC efflux system and that single mutations in the quinolone resistance-determining region of gyrA are of little relevance in mediating this resistance. Overproduction of the AcrAB efflux pump, as determined by Western blotting with an anti-AcrA polyclonal antibody, appeared to be the major mechanism of resistance to quinolones. Moreover, chloramphenicol-florfenicol and tetracycline resistance also appeared to be highly dependent on the presence of AcrAB-TolC, since the introduction of mutations in the respective acrB and tolC genes resulted in a susceptible or intermediate resistance phenotype, according to clinical MIC breakpoints, despite the presence of the FloR and Tet(G) efflux pumps. Resistance to other antibiotics, ampicillin, streptomycin, and sulfonamides, was not affected in the acrB and tolC mutants of DT104 strains harboring SGI1. Therefore, AcrAB-TolC appears to direct efflux-mediated resistance to quinolones, chloramphenicol-florfenicol, and tetracyclines in multidrug-resistant S. enterica serovar Typhimurium DT104 strains.
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Affiliation(s)
- Sylvie Baucheron
- Unité BioAgresseurs, Santé et Environnement, Institut National de la Recherche Agronomique, 37380 Nouzilly, France
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Boyd DA, Tyler S, Christianson S, McGeer A, Muller MP, Willey BM, Bryce E, Gardam M, Nordmann P, Mulvey MR. Complete nucleotide sequence of a 92-kilobase plasmid harboring the CTX-M-15 extended-spectrum beta-lactamase involved in an outbreak in long-term-care facilities in Toronto, Canada. Antimicrob Agents Chemother 2004; 48:3758-64. [PMID: 15388431 PMCID: PMC521865 DOI: 10.1128/aac.48.10.3758-3764.2004] [Citation(s) in RCA: 275] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
A major outbreak involving an Escherichia coli strain that was resistant to expanded-spectrum cephalosporins occurred in Toronto and surrounding regions in 2000 to 2002. We report the complete sequence of a plasmid, pC15-1a, that was found associated with the outbreak strain. Plasmid pC15-1a is a circular molecule of 92,353 bp consisting of two distinct regions. The first is a 64-kb region that is essentially homologous to the non-R-determinant region of plasmid R100 except for several point mutations, a few small insertions and deletions, and the absence of Tn10. The second is a 28.4-kb multidrug resistance region (MDR) that has replaced the R-determinant region of the R100 progenitor and consists mostly of transposons or partial transposons and five copies of the insertion element IS26. All drug resistance genes found in pC15-1a, including the beta-lactamase genes bla(CTX-M-15), bla(OXA-1), and bla(TEM-1), the tetracycline resistance gene tetA, and aminoglycoside resistance genes aac(6')-Ib and aac(3)-II, are located in the MDR. The bla(CTX-M-15) gene was found downstream of ISEcp1as part of a transposition unit, as determined from the surrounding sequence. Examination of the plasmids from CTX-M-15-harboring strains isolated from hospitals across Canada showed that pC15-1a was found in several strains isolated from a site in western Canada. Comparison of pC15-1a and pCTX15, found in an E. coli strain isolated in India in 1999, revealed that the plasmids had several features in common, including an R100 backbone and several of the resistance genes, including bla(CTX-M-15), bla(TEM-1), bla(OXA-1), tetA, and aac(6')-Ib.
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Affiliation(s)
- David A Boyd
- Nosocomial Infections, National Microbiology Laboratory, 1015 Arlington St., Winnipeg, Manitoba, Canada
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de Miranda JR, Drebot M, Tyler S, Shen M, Cameron CE, Stoltz DB, Camazine SM. Complete nucleotide sequence of Kashmir bee virus and comparison with acute bee paralysis virus. J Gen Virol 2004; 85:2263-2270. [PMID: 15269367 DOI: 10.1099/vir.0.79990-0] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The complete nucleotide sequence of a novel virus is presented here together with serological evidence that it belongs to Kashmir bee virus (KBV). Analysis reveals that KBV is a cricket paralysis-like virus (family Dicistroviridae: genus Cripavirus), with a non-structural polyprotein open reading frame in the 5' portion of the genome separated by an intergenic region from a structural polyprotein open reading frame in the 3' part of the genome. The genome also has a polyadenylated tail at the 3' terminus. KBV is one of several related viruses that also includes acute bee paralysis virus (ABPV). Although KBV and ABPV are about 70 % identical over the entire genome, there are considerable differences between them in significant areas of the genome, such as the 5' non-translated region (42 % nucleotide identity), between the helicase and 3C-protease domains of the non-structural polyprotein (57 % amino acid identity) and in a 90 aa stretch of the structural polyprotein (33 % amino acid identity). Phylogenetic analyses show that KBV and ABPV isolates fall into clearly separated clades with moderate evolutionary distance between them. Whether these genomic and evolutionary differences are sufficient to classify KBV and ABPV as separate species remains to be determined.
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Affiliation(s)
- J R de Miranda
- Department of Entomology, Penn State University, University Park, PA 16803, USA
| | - M Drebot
- National Microbiology Laboratory, Health Canada, Winnipeg, Manitoba, Canada R3E 3R2
| | - S Tyler
- National Microbiology Laboratory, Health Canada, Winnipeg, Manitoba, Canada R3E 3R2
| | - M Shen
- Department of Entomology, Penn State University, University Park, PA 16803, USA
| | - C E Cameron
- Department of Biochemistry, Penn State University, University Park, PA 16803, USA
| | - D B Stoltz
- Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4R2
| | - S M Camazine
- Department of Entomology, Penn State University, University Park, PA 16803, USA
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Grose C, Tyler S, Peters G, Hiebert J, Stephens GM, Ruyechan WT, Jackson W, Storlie J, Tipples GA. Complete DNA sequence analyses of the first two varicella-zoster virus glycoprotein E (D150N) mutant viruses found in North America: evolution of genotypes with an accelerated cell spread phenotype. J Virol 2004; 78:6799-807. [PMID: 15194755 PMCID: PMC421634 DOI: 10.1128/jvi.78.13.6799-6807.2004] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Varicella-zoster virus (VZV) is considered to be one of the most genetically stable of all the herpesviruses. Yet two VZV strains with a D150N missense mutation within the gE glycoprotein were isolated in North America in 1998 and 2002. The mutant strains have an accelerated cell spread phenotype, which distinguishes them from all wild-type and laboratory viruses. Since the VZV genome contains 70 additional open reading frames (ORFs), the possibility existed that the phenotypic change was actually due to an as-yet-undiscovered mutation or deletion elsewhere in the genome. To exclude this hypothesis, the entire genomes of the two mutant viruses were sequenced and found to contain 124,883 (VZV-MSP) and 125,459 (VZV-BC) nucleotides. Coding single-nucleotide polymorphisms (SNPs) were identified in 14 ORFs. One missense mutation was discovered in gH, but none was found in gB, gI, gL, or gK. There were no coding SNPs in the major regulatory protein ORF 62. One polymorphism was discovered which could never have been anticipated based on current knowledge of herpesvirus genomics, namely, the origins of replication differed from those in the prototype strain but not in a manner expected to affect cell spread. When the two complete mutant VZV sequences were surveyed in their entirety, the most reasonable conclusion was that the increased cell spread phenotype was dependent substantially or solely on the single D150N polymorphism in glycoprotein gE. The genomic results also expanded the evolutionary database by identifying which VZV ORFs were more likely to mutate over time.
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Affiliation(s)
- Charles Grose
- Department of Pediatrics, University of Iowa, Iowa City, 52242, USA.
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Tyler S, Tsang R. Genetic analysis of Canadian isolates of C:2a:P1.2,5 and B:2a:P1.2,5Neisseria meningitidisstrains belonging to the hypervirulent clone of ET-15. Can J Microbiol 2004; 50:433-43. [PMID: 15284889 DOI: 10.1139/w04-024] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Isolates of the hypervirulent Neisseria meningitidis clone ET-15 found to express the serogroup B antigen were investigated and compared with representative members of serogroup B and C isolates. Clonal-clustering methods clearly grouped the B:ET15 isolates with C:ET15 isolates, indicating the only major difference between the two groups was in the capsule expressed. The organization of the cps operon from the B:ET15 isolates was found to be consistent with typical serogroup B isolates and differed from serogroup C isolates only in the sialyl transferase gene present. This suggests that these strains arose via recombination of the sialyl transferase gene. Specific points of recombination could not be identified, however, the majority (64%) of the B:ET15 isolates contained a copy of pseudo-IS1106 downstream of the cps operon indicating the potential for a common ancestral origin. The combination of pulsed-field gel electrophoresis (PFGE) and sequence analysis of targeted regions of the cps operon permitted the differentiation of most B:ET15 isolates indicating that they likely arose from separate genetic events and do not represent the emergence and spread of a new clone. However, two isolates that appeared identical by all methods employed were temporally and geographically related although no epidemiological evidence is available indicating a link between these strains.Key words: Neisseria meningitidis, ET-15, cps operon, capsule switching, IS element.
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Affiliation(s)
- Shaun Tyler
- Canadian Science Centre for Human and Animal Health, Winnipeg, Canada.
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He R, Dobie F, Ballantine M, Leeson A, Li Y, Bastien N, Cutts T, Andonov A, Cao J, Booth TF, Plummer FA, Tyler S, Baker L, Li X. Analysis of multimerization of the SARS coronavirus nucleocapsid protein. Biochem Biophys Res Commun 2004; 316:476-83. [PMID: 15020242 PMCID: PMC7111152 DOI: 10.1016/j.bbrc.2004.02.074] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2004] [Indexed: 12/20/2022]
Abstract
Severe Acute Respiratory Syndrome (SARS), an emerging disease characterized by atypical pneumonia, has recently been attributed to a novel coronavirus. The genome of SARS Coronavirus (SARS-CoV) has recently been sequenced, and a number of genes identified, including that of the nucleocapsid protein (N). It is noted, however, that the N protein of SARS-CoV (SARS-CoV N) shares little homology with nucleocapsid proteins of other members of the coronavirus family [Science 300 (2003) 1399; Science 300 (2003) 1394]. N proteins of other coronavirus have been reported to be involved in forming the viral core and also in the packaging and transcription of the viral RNA. As data generated from some viral systems other than coronaviruses suggested that viral N–N self-interactions may be necessary for subsequent formation of the nucleocapsid and assembly of the viral particles, we decided to investigate SARS-CoV N–N interaction. By using mammalian two-hybrid system and sucrose gradient fractionations, a homotypic interaction of N, but not M, was detected by the two-hybrid analysis. The mammalian two-hybrid assay revealed an approximately 50-fold increase in SEAP activity (measurement of protein–protein interaction) in N–N interaction compared to that observed in either M–M or mock transfection. Furthermore, mutational analyses characterized that a serine/arginine-rich motif (SSRSSSRSRGNSR) between amino acids 184 and 196 is crucial for N protein oligomerization, since deletion of this region completely abolished the N protein self-multimerization. Finally, the full-length nucleocapsid protein expressed and purified from baculovirus system was found to form different levels of higher order structures as detected by Western blot analysis of the fractionated proteins. Collectively, these results may aid us in elucidating the mechanism pertaining to formation of viral nucleocapsid core, and designing molecular approaches to intervene SARS-CoV replication.
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Affiliation(s)
- Runtao He
- National Microbiology Laboratory, Health Canada, 1015 Arlington St., Winnipeg, MB, Canada R3E 3R2.
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Marra MA, Jones SJM, Astell CR, Holt RA, Brooks-Wilson A, Butterfield YSN, Khattra J, Asano JK, Barber SA, Chan SY, Cloutier A, Coughlin SM, Freeman D, Girn N, Griffith OL, Leach SR, Mayo M, McDonald H, Montgomery SB, Pandoh PK, Petrescu AS, Robertson AG, Schein JE, Siddiqui A, Smailus DE, Stott JM, Yang GS, Plummer F, Andonov A, Artsob H, Bastien N, Bernard K, Booth TF, Bowness D, Czub M, Drebot M, Fernando L, Flick R, Garbutt M, Gray M, Grolla A, Jones S, Feldmann H, Meyers A, Kabani A, Li Y, Normand S, Stroher U, Tipples GA, Tyler S, Vogrig R, Ward D, Watson B, Brunham RC, Krajden M, Petric M, Skowronski DM, Upton C, Roper RL. The Genome sequence of the SARS-associated coronavirus. Science 2003; 300:1399-404. [PMID: 12730501 DOI: 10.1126/science.1085953] [Citation(s) in RCA: 1536] [Impact Index Per Article: 73.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We sequenced the 29,751-base genome of the severe acute respiratory syndrome (SARS)-associated coronavirus known as the Tor2 isolate. The genome sequence reveals that this coronavirus is only moderately related to other known coronaviruses, including two human coronaviruses, HCoV-OC43 and HCoV-229E. Phylogenetic analysis of the predicted viral proteins indicates that the virus does not closely resemble any of the three previously known groups of coronaviruses. The genome sequence will aid in the diagnosis of SARS virus infection in humans and potential animal hosts (using polymerase chain reaction and immunological tests), in the development of antivirals (including neutralizing antibodies), and in the identification of putative epitopes for vaccine development.
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Affiliation(s)
- Marco A Marra
- British Columbia Cancer Agency (BCCA) Genome Sciences Centre, 600 West 10th Avenue, Vancouver, British Columbia V5Z 4E6, Canada.
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Nuttall S, Tyler S. The crisis of September 11: the emergency response of Ontario hospitals and other health system partners. Hosp Q 2002; 5:42-50. [PMID: 12061106 DOI: 10.12927/hcq..16757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The horrific events of September 11, 2001, have caused all individuals and institutions to step back and evaluate their ability to respond to a crisis of previously unimaginable proportions. A media search and incident review of Ontario Ministry of Health and Long-Term Care records confirms that no event in collective memory has had the potential to yield so many hospital patients. This article describes the legislative framework and process by which the ministry either leads or supports an emergency response. Within this context, the authors analyze the early preparations of the ministry and the Ontario hospital system as they readied to accept unknown numbers of patients from the attacks on the World Trade Center in New York City and the Pentagon in Washington, DC. While the focus of the article is on hospitals, the authors also consider the readiness actions taken by the system as a whole, including emergency services, CritiCall and the Ontario Hospital Association. The role of support agencies in helping Ontario's hospitals respond to the crisis is also examined. Whether the preparations undertaken and the commitments made by Ontario's hospitals and other health system partners would have been sufficient remains untested at this time. However, a careful review of emergency response strategies in order to identify any planning gaps is only prudent. This analysis concludes with a discussion of what has been learned and some thoughts on how those lessons can assist the ministry and our hospitals to remain prepared.
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Kroll JS, Farrant JL, Tyler S, Coulthart MB, Langford PR. Characterisation and genetic organisation of a 24-MDa plasmid from the Brazilian Purpuric Fever clone of Haemophilus influenzae biogroup aegyptius. Plasmid 2002; 48:38-48. [PMID: 12206754 DOI: 10.1016/s0147-619x(02)00020-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strains of Haemophilus influenzae biogroup aegyptius causing septicaemia were identified in Brazil in the 1980s, causing the life-threatening illness of Brazilian Purpuric Fever (BPF). The strains were found to fall into a single clonal group, the BPF clone, characterised by their possession of the approximately 24MDa "3031" plasmid. In this work we report the characterisation and genetic organisation of this plasmid. Analysis of the gene content of what appears to be a typical broad host range conjugative plasmid, its presence in non-BPF strains as revealed by Southern hybridisation, and the recent discovery of plasmid-lacking BPF strains, has led us to conclude that it is unlikely to play a critical role in bacterial virulence. Establishing its entire sequence has nonetheless been an important step on the road to delineating, by comparison of BPF and non-BPF strains, chromosomal genetic loci that are involved in the special virulence of the BPF clone.
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Affiliation(s)
- J S Kroll
- Molecular Infectious Diseases Group, Department of Paediatrics, Faculty of Medicine, Imperial College of Science, Technology, and Medicine, Norfolk Place, London W2 1PG, UK.
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