{"title":"The roles of rabies virus structural proteins in immune evasion and implications for vaccine development.","authors":"Pei-Hua Wang, Li Xing","doi":"10.1139/cjm-2024-0023","DOIUrl":"10.1139/cjm-2024-0023","url":null,"abstract":"<p><p>Rabies is a zoonotic infectious disease that targets the nervous system of human and animals and has about 100% fatality rate without treatment. Rabies virus is a bullet-like viral particle composed of five structural proteins, including nucleoprotein (N), phosphorylated protein (P), matrix protein (M), glycoprotein (G), and large subunit (L) of RNA-dependent RNA polymerase. These multifunctional viral proteins also play critical roles in the immune escape by inhibiting specific immune responses in the host, resulting in massive replication of the virus in the nervous system and abnormal behaviors of patients such as brain dysfunction and hydrophobia, which ultimately lead to the death of patients. Herein, the role of five structural proteins of rabies virus in the viral replication and immune escape and its implication for the development of vaccines were systemically reviewed, so as to shed light on the understanding of pathogenic mechanism of rabies virus.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142280566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Renee H Petipas, Cassidy Peru, Janice M Parks, Maren L Friesen, Chandra N Jack
{"title":"Prairie soil improves wheat establishment and accelerates the developmental transition to flowering compared to agricultural soils.","authors":"Renee H Petipas, Cassidy Peru, Janice M Parks, Maren L Friesen, Chandra N Jack","doi":"10.1139/cjm-2023-0237","DOIUrl":"10.1139/cjm-2023-0237","url":null,"abstract":"<p><p>Less than 1% of native prairie lands remain in the United States. Located in eastern Washington, the rare habitat called Palouse prairie was largely converted to wheat monocropping. With this conversion came numerous physical, chemical, and biological changes to the soil that may ultimately contribute to reduced wheat yields. Here, we explored how wheat (<i>Tritcum aestivum</i> L.) seedling establishment, plant size, and heading, signifying the developmental transition to flowering, were affected by being planted in prairie soil versus agricultural soils. We then sought to understand whether the observed effects were the result of changes to the soil microbiota due to agricultural intensification. We found that prairie soil enhanced both the probability of wheat seedling survival and heading compared to agricultural soil; however, wheat growth was largely unaffected by soil source. We did not detect effects on wheat developmental transitions or phenotype when inoculated with prairie microbes compared with agricultural microbes, but we did observe general antagonistic effects of microbes on plant size, regardless of soil source. This work indicates that agricultural intensification has affected soils in a way that changes early seedling establishment and the timing of heading for wheat, but these effects may not be caused by microbes, and instead may be caused by soil nutrient conditions.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141901029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Farhan Yusuf, Saher M Ahmed, Danica Dy, Katherine Baney, Hassan Waseem, Kimberley A Gilbride
{"title":"Occurrence and characterization of plasmid-encoded <i>qnr</i> genes in quinolone-resistant bacteria across diverse aquatic environments in southern Ontario.","authors":"Farhan Yusuf, Saher M Ahmed, Danica Dy, Katherine Baney, Hassan Waseem, Kimberley A Gilbride","doi":"10.1139/cjm-2024-0029","DOIUrl":"10.1139/cjm-2024-0029","url":null,"abstract":"<p><p>Antimicrobial resistance is an ever-increasing threat. The widespread usage of ciprofloxacin has led to the manifestation of resistance due to chromosomal mutations or the acquisition of plasmid-mediated quinolone resistance (PMQR) traits. Some particular PMQR traits, <i>qnr</i> genes, have been identified globally in clinical and environmental isolates. This study aimed to determine the prevalence of ciprofloxacin-resistant bacteria in aquatic environments in southern Ontario and investigate the extent of dissemination of ciprofloxacin resistance traits among the bacterial communities. We surveyed the prevalence of plasmid encoding <i>qnr</i> genes using a multiplex PCR assay of associated PMQR genes, <i>qnr</i>A, <i>qnr</i>B, and <i>qn</i>rS, on 202 isolates. Despite the absence of significant impacts on minimum inhibitory concentration levels, the presence of <i>qnr</i> genes correlates with heightened resistance to quinolones and nalidixic acid in some isolates. Taxonomic analysis highlights distinct differences in the composition and diversity of ciprofloxacin-sensitive (CipS) and ciprofloxacin-resistant (CipR) populations, with Proteobacteria dominating both groups. Importantly, CipR populations exhibit lower genetic diversity but higher prevalence of multiple antibiotic resistances, suggesting co-selection mechanisms. Co-occurrence analysis highlights significant associations between ciprofloxacin resistance and other antibiotic resistances, implicating complex genetic linkages. The results of our study signified the critical role of environmental monitoring in public health.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141859118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Biogeochemical stability of organic covers and mine wastes under climate change simulated mesocosms.","authors":"Asma Asemaninejad, Ted Mackinnon, Sean Langley","doi":"10.1139/cjm-2024-0064","DOIUrl":"10.1139/cjm-2024-0064","url":null,"abstract":"<p><p>Mine environments in boreal and sub-boreal zones are expected to experience extreme weather events, increases in temperature, and shifts in precipitation patterns. Climate change impacts on geochemical stability of tailings contaminants and reclamation structures have been identified as important climate-related challenges to Canadian mining sector. Adapting current reclamation strategies for climate change will improve long-term efficiency and viability of mine tailings remediation/restoration strategies under a changing climate. Accordingly, mesocosm experiments were conducted to investigate associations of climate-driven shifts in microbial communities and functions with changes in the geochemistry of organic covers and underlying tailings. Our results show that warming appears to significantly reduce C:N of organic cover and promote infiltration of nitrogen into deeper, unoxidized strata of underlying tailings. We also observed an increase in the abundance of some nitrate reducers and sulfide oxidizers in microbial communities in underlying tailings. These results raise the concern that warming might trigger oxidation of sulfide minerals (linked to nitrate reduction) in deeper unoxidized strata where the oxygen has been eliminated. Therefore, it would be necessary to have monitoring programs to track functionality of covers in response to climate change conditions. These findings have implications for development of climate resilient mine tailings remediation/restoration strategies.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142104564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mario Andres Pantoja España, Miller Cerón Gómez, Eddy Patricia López Molano, Raúl Mauricio Insuasty, Eduardo Ibarguen-Mondragón, María Mármol Martínez, Edith Mariela Burbano-Rosero, Deisy Lorena Guerrero-Ceballos, Jenny Dimelza Gómez Arrieta, Juan Camilo Paz García, Pablo Heyman Fernández Izquierdo, Arsenio Hidalgo Troya, Jaqueline Mena-Huertas, Noemi Nosomi Taniwaki, Gislene Mitsue Namiyama
{"title":"Somatic coliphages as bioindicators of contamination in Lake Guamuez, Colombia.","authors":"Mario Andres Pantoja España, Miller Cerón Gómez, Eddy Patricia López Molano, Raúl Mauricio Insuasty, Eduardo Ibarguen-Mondragón, María Mármol Martínez, Edith Mariela Burbano-Rosero, Deisy Lorena Guerrero-Ceballos, Jenny Dimelza Gómez Arrieta, Juan Camilo Paz García, Pablo Heyman Fernández Izquierdo, Arsenio Hidalgo Troya, Jaqueline Mena-Huertas, Noemi Nosomi Taniwaki, Gislene Mitsue Namiyama","doi":"10.1139/cjm-2023-0147","DOIUrl":"https://doi.org/10.1139/cjm-2023-0147","url":null,"abstract":"<p><p>Lake Guamuez is the second largest lake in Colombia and economically supports hundreds of families in the area. The main activities carried out in the region have focused on tourism, agriculture, livestock, and rainbow trout production; however, these activities have been associated with contamination of the lake. This research aimed to evaluate the water quality of Lake Guamuez using somatic coliphages (SCs) as bioindicators. For this purpose, periodic sampling was carried out for six months at 9 strategic points of the lake. For the detection of SCs, the method described in 9211 D of the Standard Methods for the Examination of Water and Wastewater was used. The genomic variability and presence of virulence genes in the isolated SCs were determined. Water contamination in the lake is evident, and the SCs titer is greater in areas with a high flow of anthropogenic activities. An important degree of genetic diversity and a high prevalence of virulence genes could be observed among the SCs analyzed. The results when compared with guidelines and water quality standards from various countries, showed concentrations of SCs higher than those allowed. The high prevalence of gastrointestinal diseases in the region suggests a link to water contamination.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142495598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adelumola Oladeinde, Kimberly Cook, Attiq Rehman, Catherine D Carrillo, Reed Woyda, Crystal Wiersma, Zaid Abdo, Jasmine Johnson, Anna Marie Bosch, Michael Rothrock, Moussa Diarra
{"title":"Survival of Antimicrobial Resistant Salmonella Heidelberg Inoculated into Microcosms of Fresh Pine Wood Shavings for Broiler Litter.","authors":"Adelumola Oladeinde, Kimberly Cook, Attiq Rehman, Catherine D Carrillo, Reed Woyda, Crystal Wiersma, Zaid Abdo, Jasmine Johnson, Anna Marie Bosch, Michael Rothrock, Moussa Diarra","doi":"10.1139/cjm-2024-0088","DOIUrl":"https://doi.org/10.1139/cjm-2024-0088","url":null,"abstract":"<p><p>This study applied genomic characterizations to a cocktail of three Salmonella enterica serovar Heidelberg (S. Heidelberg) strains different antimicrobial resistance (AMR) profile which were inoculated into fresh pine wood shavings (PWS) microcosms. The strains were isolated from feces (SH-AAFC), carcass (SH-ARS) and thigh (SH-FSIS) of broiler chicken. SH-AAFC harbored an antimicrobial resistant gene (ARG) blaCMY-2 on an IncI1 plasmid while SH-FSIS harbored multiple ARGs (floR, cmlA1, tet(A), blaTEM-1B, ant(2'')-Ia, aph(6)-Id, aph(3'')-Ib and sul2) on an IncC plasmid. SH-ARS was pan-susceptible. The die-off of Salmonella was determined at days 0, 1, 7, 14 and 21. Antibiotic susceptibility tests and whole genome sequencing were performed on 77 isolates. At 21 days post-inoculation, Salmonella abundance decreased by 4.4 Log10 CFU/g with the water activity of PWS being correlated with Salmonella survival. SH-AAFC clonal populations survived longer in PWS than SH-FSIS and SH-ARS populations. SH-AAFC clones persisting in litter carried higher copy number of Col plasmids than their ancestors, while some SH-ARS clones acquired a lysogenic bacteriophage from SH-FSIS populations. These results suggests that mobile genetic determinants such as plasmids (which could carry ARGs) and bacteriophage plays roles in the persistence of S. Heidelberg in the PWS used as broiler litter.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142495599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Maryam Bahraminia, Shujun Cui, Ze Zhang, Abdelhabib Semlali, Étienne Le Roux, Kelly-Anne Giroux, Camille Lajoie, François Béland, Mahmoud Rouabhia
{"title":"Effect of Cannabidiol (CBD), a cannabis plant derivative, against Candida albicans growth and biofilm formation.","authors":"Maryam Bahraminia, Shujun Cui, Ze Zhang, Abdelhabib Semlali, Étienne Le Roux, Kelly-Anne Giroux, Camille Lajoie, François Béland, Mahmoud Rouabhia","doi":"10.1139/cjm-2024-0034","DOIUrl":"https://doi.org/10.1139/cjm-2024-0034","url":null,"abstract":"<p><p>This study aimed to evaluate the antifungal activities of cannabidiol (CBD) against C. albicans. Yeast cells were treated once or twice with different concentrations (from 0 to 20 mg/ml) of CBD, showing a significant (p < 0.05) decreased the growth of C. albicans, with cell concentrations ranging from 5.1 × 106 cell/mL in the control to 1.8 × 106 cell/mL after one exposure to 20 µg/mL CBD. This growth reduction was greater after two exposures to CBD. After two exposures to 20 µg/mL CBD, the cell concentration was only 1.1 × 106 cell/mL. Such a growth decrease in C. albicans was confirmed by a reduced number of CFUs and a lower MTT value compared to the control. The growth inhibition was supported by a significant (p < 0.001) decrease in the yeast-to-hyphae transition, ranging from 20 ± 0.2% in the control to 2 ± 0.5% after exposure to 20 µg/mL CBD. Biofilm formation was also significantly reduced following CBD exposure. CBD at 10 and 20 µg/mL promoted the death of C. albicans through an apoptosis/necrotic pathway. Altogether, our results suggest the possible use of CBD, a cannabis derivative, to control C. albicans infection, including oral candidiasis.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142458629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"What in Earth? Analyses of Canadian soil populations of Aspergillus fumigatus.","authors":"Greg Korfanty, Arshia Kazerouni, Mykaelah Dixon, Michaela Trajkovski, Paola Gomez, Jianping Xu","doi":"10.1139/cjm-2024-0083","DOIUrl":"https://doi.org/10.1139/cjm-2024-0083","url":null,"abstract":"<p><p>Aspergillus fumigatus is a globally distributed mold and a major cause of opportunistic infections in humans. Because most infections are from environmental exposure, it's critical to understand environmental populations of A. fumigatus. Soil is a major ecological niche for A. fumigatus. Here we analyzed 748 soil isolates from 21 locations in six provinces and one territory in Canada. All isolates were genotyped using nine microsatellite markers. Due to small sample size and/or close proximities for some local samples, these isolates were grouped into 16 local geographic and ecological populations. Our results indicated high allelic and genotypic diversities within most local and provincial populations. Interestingly, low but statistically significant genetic differentiations were found among geographic populations within Canada, with relatively similar proportions of strains and genotypes belonging to two large genetic clusters. In Hamilton, Ontario and Vancouver, BC, where two and three ecological populations were analyzed respectively, we found limited genetic difference among them. Most local and provincial populations showed evidence of both clonality and recombination, with no population showing random recombination. Of the 748 soil isolates analyzed here, two were resistant to triazole antifungals. We discuss the implications of our results to the evolution and epidemiology of A. fumigatus.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142458630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alexander Stephen Byrne, Nathalie Bissonnette, Kapil Tahlan
{"title":"Mechanisms and Implications of Phenotypic Switching in Bacterial Pathogens.","authors":"Alexander Stephen Byrne, Nathalie Bissonnette, Kapil Tahlan","doi":"10.1139/cjm-2024-0116","DOIUrl":"https://doi.org/10.1139/cjm-2024-0116","url":null,"abstract":"<p><p>Bacteria encounter various stressful conditions within a variety of dynamic environments, which they must overcome for survival. One way they achieve this is by developing phenotypic heterogeneity to introduce diversity within their population. Such distinct subpopulations can arise through endogenous fluctuations in regulatory components, wherein bacteria can express diverse phenotypes and switch between them, sometimes in a heritable and reversible manner. This switching may also lead to antigenic variation, enabling pathogenic bacteria to evade the host immune response. Therefore, phenotypic heterogeneity plays a significant role in microbial pathogenesis, immune evasion, antibiotic resistance, host niche tissue establishment and environmental persistence. This heterogeneity can result from stochastic and responsive switches, as well as various genetic and epigenetic mechanisms. The development of phenotypic heterogeneity may create clonal populations that differ in their level of virulence, contribute to the formation of biofilms, and allow for antibiotic persistence within select morphological variants. This review delves into the current understanding of the molecular switching mechanisms underlying phenotypic heterogeneity, highlighting their roles in establishing infections caused by select bacterial pathogens.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142370976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Chemical-mediated virulence: the effects of host chemicals on microbial virulence and potential new antivirulence strategies.","authors":"Peri B Moulding, Omar M El-Halfawy","doi":"10.1139/cjm-2024-0017","DOIUrl":"10.1139/cjm-2024-0017","url":null,"abstract":"<p><p>The rising antimicrobial resistance rates and declining antimicrobial discovery necessitate alternative strategies to combat multidrug-resistant pathogens. Targeting microbial virulence is an emerging area of interest. Traditionally, virulence factors were largely restricted to bacteria-derived toxins, adhesins, capsules, quorum sensing systems, secretion systems, factors required to sense, respond to, acquire, or synthesize, and utilize trace elements (such as iron and other metals) and micronutrients (such as vitamins), and other factors bacteria use to establish infection, form biofilms, or damage the host tissues and regulatory elements thereof. However, this traditional definition overlooks bacterial virulence that may be induced or influenced by host-produced metabolites or other chemicals that bacteria may encounter at the infection site. This review will discuss virulence from a non-traditional perspective, shedding light on chemical-mediated host-pathogen interactions and outlining currently available mechanistic insight into increased bacterial virulence in response to host factors. This review aims to define a possibly underestimated theme of chemically mediated host-pathogen interactions and encourage future validation and characterization of the contribution of host chemicals to microbial virulence in vivo. From this perspective, we discuss proposed antivirulence compounds and suggest new potential targets for antimicrobials that prevent chemical-mediated virulence. We also explore proposed host-targeting therapeutics reducing the level of host chemicals that induce microbial virulence, serving as virulence attenuators. Understanding the host chemical-mediated virulence may enable new antimicrobial solutions to fight multidrug-resistant pathogens.</p>","PeriodicalId":9381,"journal":{"name":"Canadian journal of microbiology","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141436327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}