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Van Nederveen V, Johnson YS, Ortega E, Soc A, Smith MA, Melton-Celsa AR. Role of aggregative adherence fimbriae from enteroaggregative Escherichia coli isolates in biofilm and colonization. Microb Pathog 2025; 203:107444. [PMID: 40032001 DOI: 10.1016/j.micpath.2025.107444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2024] [Revised: 01/10/2025] [Accepted: 02/28/2025] [Indexed: 03/05/2025]
Abstract
Enteroaggregative Escherichia coli (EAEC) are a diverse group of bacteria that cause diarrhea worldwide. EAEC significantly affect travelers to endemic regions, including military personnel, and children in developing countries where EAEC infection is associated with childhood failure-to-thrive. EAEC creates thick biofilms on the intestinal mucosa, a process that is thought to contribute to the development of both diarrhea and childhood failure-to-thrive. Typical EAEC strains encode and produce just one aggregative adherence fimbriae (AAF) out of the five different AAF types. The AAF are required for aggregative adherence to epithelial cells in vitro, but the degree of importance of each of the AAF types in both biofilm formation and pathogenesis is unknown. In this study, we investigated the role of the fimbriae in EAEC biofilms by deleting the major fimbrial subunit gene for the AAF from each of the five AAF categories and observing the impact on biofilm staining from recent EAEC clinical isolates. We found that biofilm was significantly reduced in all strains when the AAF gene was deleted, and that the defect could be overcome by complementation. In this work we also describe a modified murine EAEC model appropriate for colonization studies. In an antibiotic-treated mouse colonization model, some AAF mutant strains were attenuated for colonization, including AAF/II, AAF/IV, and AAF/V isolates. We did not observe complementation of the attenuated colonization phenotype in the mouse model. However, since we found a colonization defect for several EAEC mutant strains of different AAF types, a link between the fimbriae and colonization in the mice is supported. Taken together, our results show that the AAF are required for biofilm formation, and that some AAF contribute to colonization in a mouse model.
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Affiliation(s)
- Viktoria Van Nederveen
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA; Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, USA
| | - Yuliya Seldina Johnson
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA; Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, USA
| | - Ennzo Ortega
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA; Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, USA
| | - Anthony Soc
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA; Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, USA
| | | | - Angela R Melton-Celsa
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD, USA.
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Soares MAM, Silva GML, Lima LBD, Oliveira FB, Paiva SG, Paulino MG, Júnior JCR, Moron SE. Lack of basic sanitation influence on the enteropathogen presence in a river of the Brazilian Legal Amazon. ENVIRONMENTAL MONITORING AND ASSESSMENT 2025; 197:231. [PMID: 39900854 DOI: 10.1007/s10661-025-13667-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2024] [Accepted: 01/24/2025] [Indexed: 02/05/2025]
Abstract
Water systems globally are declining in water quality, largely due to anthropogenic activities, with freshwater contamination reaching unprecedented levels. The Brazilian Legal Amazon (BLA), holding 13.56% of the world's fresh water, is affected due to the lack of basic sanitation. This study assesses the quality of the Lontra River, in southeastern BLA, by monitoring physicochemical and microbiological parameters and detecting DEC E. coli and Salmonella spp. over 16 months, following current regulations. The data were analyzed using Pearson's chi-square and Fisher's exact test (p ≤ 0.05), Kruskal-Wallis test (p ≤ 0.05), with Tukey post hoc (α = 0.05), and Spearman's correlation (p ≤ 0.05). Results showed pH levels were below the optimal range established by Brazilian water quality indices and legislation, with seasonal variations, and dissolved oxygen also below acceptable limits. Thermotolerant coliforms (TtC) exceeded thresholds, signaling microbiological contamination. DEC E. coli and Salmonella spp. were detected in 32.14% and 67.85% of samples, respectively, even in those with low TtC levels. No correlation was found between TtC and pathogen presence, suggesting that meeting minimum water quality standards does not guarantee the absence of pathogenic microorganisms. These findings reveal significant environmental and public health risks related to surface water quality in the Lontra River. Also highlight discrepancies between regulatory water quality standards and the actual conditions observed, underscoring the need for regionally adapted water monitoring and management practices to protect both environmental and public health in the BLA.
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Affiliation(s)
- M A M Soares
- Department of Physiological Sciences, Federal University of São Carlos, Washington Luís Highway, São Carlos, São Paulo, 13565-905, Brazil.
| | - G M L Silva
- Laboratory of Morphophysiology and Biochemistry, Center of Agricultural Sciences, Federal University of Northern Tocantins, BR-153, Km 112, Araguaína, Tocantins, 77804-970, Brazil
| | - L B D Lima
- Laboratory of Morphophysiology and Biochemistry, Center of Agricultural Sciences, Federal University of Northern Tocantins, BR-153, Km 112, Araguaína, Tocantins, 77804-970, Brazil
| | - F B Oliveira
- Laboratory of Comparative Animal Morphophysiology, Center of Integrated Sciences, Federal University of Northern Tocantins, Paraguay Avenue, Araguaína, Tocantins, 77824-838, Brazil
| | - S G Paiva
- Federal Institute of Education, Science, and Technology of Tocantins, Araguaína Campus - Paraguai Avenue 838, Block 56 - Lot 01 - Cimba District, Araguaína, Tocantins, Brazil
| | - M G Paulino
- Laboratory of Comparative Animal Morphophysiology, Center of Integrated Sciences, Federal University of Northern Tocantins, Paraguay Avenue, Araguaína, Tocantins, 77824-838, Brazil
| | - J C Ribeiro Júnior
- Laboratory of Food Microbiology, Center of Agricultural Sciences, Federal University of Northern Tocantins, BR-153, Km 112, Araguaína, Tocantins, 77804-970, Brazil
| | - S E Moron
- Laboratory of Morphophysiology and Biochemistry, Center of Agricultural Sciences, Federal University of Northern Tocantins, BR-153, Km 112, Araguaína, Tocantins, 77804-970, Brazil
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3
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Luiz BM, Cergole-Novella MC, Dantas STA, de Lira DRP, de Souza GFR, Fernandes IDA, Orsi H, Solveira G, Rall VLM, Dos Santos LF, Hernandes RT. Enteroaggregative Escherichia coli (EAEC) isolates obtained from non-diarrheic children carry virulence factor-encoding genes from Extraintestinal Pathogenic E. Coli (ExPEC). Braz J Microbiol 2024; 55:3551-3561. [PMID: 39083223 PMCID: PMC11711792 DOI: 10.1007/s42770-024-01471-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2024] [Accepted: 07/19/2024] [Indexed: 01/11/2025] Open
Abstract
Enteroaggregative E. coli (EAEC) is one of the most frequent pathogens isolated from diarrheal patients as well as from healthy individuals in Brazil and has recently also been implicated as an extraintestinal pathogenic E. coli (ExPEC) associated with bloodstream and urinary tract infections. In this study, 37 EAEC isolates, obtained from fecal samples of non-diarrheic children, were molecularly and phenotypically characterized to access the pathogenic features of these isolates. The EAEC isolates were assigned into the phylogroups A (54.1%), D (29.7%), B1 (13.5%) and B2 (2.7%); and harbored genes responsible for encoding the major pilin subunit of the aggregative adherence fimbriae (AAFs) or aggregate-forming pili (AFP) adhesins as follows: aggA (24.3%), agg3A (5.4%), agg4A (27.0%), agg5A (32.4%) and afpA (10.8%). The most frequent O:H serotypes were O15:H2 (8.1%), O38:H25 (5.4%) and O86:H2 (5.4%). Twenty-one isolates (56.8%) produce the aggregative adherence (AA) pattern on HeLa cells, and biofilm formation was more efficient among EAEC isolates harboring the aggA and agg5A genes. PFGE analysis showed that 31 (83.8%) of the isolates were classified into 10 distinct clusters, which reinforces the high diversity found among the isolates studied. Of note, 40.5% (15/37) of the EAEC isolates have a genetic profile compatible with E. coli isolates with intrinsic potential to cause extraintestinal infections in healthy individuals, and therefore, classified as EAEC/ExPEC hybrids. In conclusion, we showed the presence of EAEC/ExPEC hybrids in the intestinal microbiota of non-diarrheic children, possibly representing the source of some endogenous extraintestinal infections.
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Affiliation(s)
- Bruna M Luiz
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
| | | | - Stéfani T A Dantas
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brasil
| | - Daiany R P de Lira
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
| | | | | | - Henrique Orsi
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
| | - Guilherme Solveira
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
| | - Vera L M Rall
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil
| | - Luís F Dos Santos
- Centro de Bacteriologia, Instituto Adolfo Lutz, São Paulo, SP, Brasil
| | - Rodrigo T Hernandes
- Instituto de Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brasil.
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Oliveira-Silva M, Goulart RS, Moraes MA, Nakamura-Silva R, Fujimoto RY, Sousa RC, Kobayashi RKT, Medeiros LP, Nakazato G, Pitondo-Silva A. Multidrug-resistant Escherichia coli strains isolated from swine manure biofertilizer in Brazil. ENVIRONMENTAL MONITORING AND ASSESSMENT 2024; 196:534. [PMID: 38727864 DOI: 10.1007/s10661-024-12658-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Accepted: 03/30/2024] [Indexed: 06/21/2024]
Abstract
Escherichia coli is one of the key bacteria responsible for a variety of diseases in humans and livestock-associated infections around the globe. It is the leading cause of mortality in neonatal and weaned piglets in pig husbandry, causing diarrhea and significant harm to the industry. Furthermore, the frequent and intensive use of antimicrobials for the prevention of diseases, particularly gastrointestinal diseases, may promote the selection of multidrug-resistant (MDR) strains. These resistant genotypes can be transmitted through the excrement of animals, including swine. It is common practice to use porcine manure processed by biodigesters as fertilizer. This study aimed to examine the antimicrobial susceptibility, the presence of virulence genes frequently associated with pathotypes of intestinal pathogenic E. coli (InPEC), and antimicrobial resistance genes (ARGs) of 28 E. coli isolates collected from swine manure fertilizers. In addition, the enterobacterial repetitive intergenic consensus-PCR (ERIC-PCR) technique was used to investigate the genetic relationship among the strains. Using disk diffusion, the antimicrobial susceptibility profiles of the strains were determined. Using polymerase chain reaction (PCR), 14 distinct virulence genes associated with the most prevalent diarrhea and intestinal pathogenic E. coli (DEC/InPEC) and five ARGs were analyzed. All isolates tested positive for multidrug resistance. There was no detection of any of the 14 virulence genes associated with InPECs, indicating the presence of an avirulent commensal microbiota. Molecular classification by ERIC-PCR revealed that the majority of isolates (27 isolates) coalesced into a larger cluster with a genetic similarity of 47.7%; only one strain did not cluster in this cluster, indicating a high level of genetic diversity among the analyzed isolates. Thus, it is of the utmost importance to conduct epidemiological surveillance of animal breeding facilities in order to determine their microbiota and formulate plans to reduce the use of antimicrobials and improve animal welfare.
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Affiliation(s)
- Mariana Oliveira-Silva
- Universidade de Ribeirão Preto (UNAERP), Avenida Costábile Romano, N° 2201. Bloco J, Lab. 1, Ribeirânia., Ribeirão Preto, SP, CEP 14096-900, Brazil
| | - Rafael Silva Goulart
- Universidade de Ribeirão Preto (UNAERP), Avenida Costábile Romano, N° 2201. Bloco J, Lab. 1, Ribeirânia., Ribeirão Preto, SP, CEP 14096-900, Brazil
| | - Miguel Augusto Moraes
- Universidade de Ribeirão Preto (UNAERP), Avenida Costábile Romano, N° 2201. Bloco J, Lab. 1, Ribeirânia., Ribeirão Preto, SP, CEP 14096-900, Brazil
| | - Rafael Nakamura-Silva
- Universidade de Ribeirão Preto (UNAERP), Avenida Costábile Romano, N° 2201. Bloco J, Lab. 1, Ribeirânia., Ribeirão Preto, SP, CEP 14096-900, Brazil
| | - Rodrigo Yudi Fujimoto
- Empresa Brasileira de Pesquisa Agropecuária-EMBRAPA, Unidade Tabuleiros Costeios, Av. Beira Mar, 3250 Jardins, Aracaju, Sergipe, CEP 49025040, Brazil
| | - Ricardo Coelho Sousa
- Empresa Brasileira de Pesquisa Agropecuária-EMBRAPA, Unidade Tabuleiros Costeios, Av. Beira Mar, 3250 Jardins, Aracaju, Sergipe, CEP 49025040, Brazil
| | - Renata Katsuko Takayama Kobayashi
- Laboratório de Bacteriologia Básica E Aplicada, Departamento de Microbiologia, Universidade Estadual de Londrina, Rod. Celso Garcia Cid PR 445 Km 380, Londrina, PR, CEP 86057-970, Brazil
| | - Leonardo Pinto Medeiros
- Laboratório de Bacteriologia Básica E Aplicada, Departamento de Microbiologia, Universidade Estadual de Londrina, Rod. Celso Garcia Cid PR 445 Km 380, Londrina, PR, CEP 86057-970, Brazil
| | - Gerson Nakazato
- Laboratório de Bacteriologia Básica E Aplicada, Departamento de Microbiologia, Universidade Estadual de Londrina, Rod. Celso Garcia Cid PR 445 Km 380, Londrina, PR, CEP 86057-970, Brazil
| | - André Pitondo-Silva
- Universidade de Ribeirão Preto (UNAERP), Avenida Costábile Romano, N° 2201. Bloco J, Lab. 1, Ribeirânia., Ribeirão Preto, SP, CEP 14096-900, Brazil.
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Titus KS, Magu D, Wanzala P. Subjects' Sociodemographics Influence the Transmission Patterns of Diarrheagenic Escherichia coli Pathotypes among Children under 5 Years in Nakuru County. Ann Afr Med 2024; 23:132-139. [PMID: 39028160 PMCID: PMC11210731 DOI: 10.4103/aam.aam_41_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 09/07/2023] [Indexed: 07/20/2024] Open
Abstract
BACKGROUND Diarrheagenic Escherichiacoli (DEC) infections constitute the leading causes of morbidity and mortality among children in Sub-Saharan Africa. However, little has so far been done to properly reveal the pathogenic endowments of DEC in these populations. AIMS AND OBJECTIVES We evaluated 4 DEC strains among children under 5 years. MATERIALS AND METHODS A cross-sectional study design was employed among 384 positive cases. RESULTS There was a significant decline in infections associated with DEC as the children grew older (χ2[12] = 87.366: P = [0.000]. A total of 56 (14.6%) cases were 0-12 months, 168 (43.8%) were 13-24 months, 88 (22.9%) were 25-36 months, 40 (10.4%) were 37-48 months, and 32 (8.3%) were 49-60 months. A total of 248 (64.6%) male subjects exhibited more susceptibility to DEC infections than their female counterparts (n = 136 [35.4%]) (χ2[3] =13.313: P = [0.004]. Subjects from urban areas (n = 248 [64.6%]), significantly bored the brunt of infections than those from rural areas (n = 136 [35.4%]) (χ2[3] = 35.147: P = [0.000]. The prevalence of DEC appeared significantly higher during rainy seasons (n = 269 [70.1%]). CONCLUSION Young age, male gender, crowding, and rainy season play a central role in the transmission of DEC pathotypes.
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Affiliation(s)
- K Suge Titus
- Department of Environmental Health and Disease Control, School of Public Health, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
- Department of Pharmacology and Pharmacognosy, Kabarak University, Nakuru, Kenya
| | - Dennis Magu
- Department of Environmental Health and Disease Control, School of Public Health, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
| | - Peter Wanzala
- Department of Pharmacology and Pharmacognosy, Kabarak University, Nakuru, Kenya
- Centre for Public Health Research, Kenya Medical Research Institute, Nairobi, Kenya
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Modgil V, Kaur H, Mohan B, Taneja N. Association of Putative Virulence Genes with HEp-2 Cell Adherence and Biofilm Production in Enteroaggregative E. coli Strains Isolated from Acute Diarrheal and Healthy Children, India. Indian J Microbiol 2024; 64:186-197. [PMID: 38468739 PMCID: PMC10924848 DOI: 10.1007/s12088-023-01157-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 11/17/2023] [Indexed: 03/13/2024] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) is an emerging enteric pathogen that causes acute and chronic diarrhea in developed and industrialized countries in children. EAEC colonizes the human intestine and this ability to form colonies and biofilm is an important step in pathogenesis. Here, we investigated the relationship between known or putative 22 EAEC virulence genes and biofilm formation in isolates derived from acute diarrhea and healthy children and their aggregative adherence (AA) pattern with Hep-2 cell lines. A total of 138 EAEC isolates were recovered from 1210 stool samples from children (age < 10 years) suffering from acute diarrhea and 33 EAEC strains isolated from 550 healthy children (control group) of different Anganwadi centers in Chandigarh region were included. Polymerase chain reaction using the primer pair pCVD432 identified E. coli isolates as EAEC. A total of 22 virulence-related genes have been identified using M-PCR chain reactions. The crystal violet method was used for the quantitative biofilm assay. Aggregative adherence assay was also studied using HEp-2 cell lines. Of 138 EAEC isolates from the acute diarrheal group, 121 (87.6%) EAEC isolates produced biofilm. In our findings, typical EAEC (62%) isolates were strong biofilm producers (37.5%) in the diarrheal group. Among adhesive variants, agg4A (39.6%) and aggA (21.6%) were the most common and were statistically significant (p = 0.01 and p = 0.03 respectively). We reported that the aggR gene along with the typical AA pattern was present in 71.4% of the EAEC strains in the diarrheal group, whereas it was present in 44% of the control group. Other aggR non-dependent genes like ORF3 and eilA may also lead to biofilm formation. In conclusion, there is significant heterogeneity in putative virulence genes of EAEC isolates from children and biofilm formation is associated with the combination of many genes.
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Affiliation(s)
- Vinay Modgil
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Harpreet Kaur
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Balvinder Mohan
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Neelam Taneja
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Correa GB, Freire CA, Dibo M, Huerta-Cantillo J, Navarro-Garcia F, Barbosa AS, Elias WP, Moraes CTP. Plasmid-encoded toxin of Escherichia coli cleaves complement system proteins and inhibits complement-mediated lysis in vitro. Front Cell Infect Microbiol 2024; 14:1327241. [PMID: 38371299 PMCID: PMC10869522 DOI: 10.3389/fcimb.2024.1327241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/08/2024] [Indexed: 02/20/2024] Open
Abstract
Plasmid-encoded toxin (Pet) is an autotransporter protein of the serine protease autotransporters of Enterobacteriaceae (SPATE) family, important in the pathogenicity of Escherichia coli. The pet gene was initially found in the enteroaggregative E. coli (EAEC) virulence plasmid, pAA2. Although this virulence factor was initially described in EAEC, an intestinal E. coli pathotype, pet may also be present in other pathotypes, including extraintestinal pathogenic strains (ExPEC). The complement system is an important defense mechanism of the immune system that can be activated by invading pathogens. Proteases produced by pathogenic bacteria, such as SPATEs, have proteolytic activity and can cleave components of the complement system, promoting bacterial resistance to human serum. Considering these factors, the proteolytic activity of Pet and its role in evading the complement system were investigated. Proteolytic assays were performed by incubating purified components of the complement system with Pet and Pet S260I (a catalytic site mutant) proteins. Pet, but not Pet S260I, could cleave C3, C5 and C9 components, and also inhibited the natural formation of C9 polymers. Furthermore, a dose-dependent inhibition of ZnCl2-induced C9 polymerization in vitro was observed. E. coli DH5α survived incubation with human serum pre-treated with Pet. Therefore, Pet can potentially interfere with the alternative and the terminal pathways of the complement system. In addition, by cleaving C9, Pet may inhibit membrane attack complex (MAC) formation on the bacterial outer membrane. Thus, our data are suggestive of a role of Pet in resistance of E. coli to human serum.
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Affiliation(s)
| | | | - Miriam Dibo
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
| | - Jazmin Huerta-Cantillo
- Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (IPN), Mexico City, Mexico
| | - Fernando Navarro-Garcia
- Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (IPN), Mexico City, Mexico
| | | | - Waldir P. Elias
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
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Roy Chowdhury P, Hastak P, DeMaere M, Wyrsch E, Li D, Elankumaran P, Dolejska M, Browning GF, Marenda MS, Gottlieb T, Cheong E, Merlino J, Myers GSA, Djordjevic SP. Phylogenomic analysis of a global collection of Escherichia coli ST38: evidence of interspecies and environmental transmission? mSystems 2023; 8:e0123622. [PMID: 37675998 PMCID: PMC10654095 DOI: 10.1128/msystems.01236-22] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 07/11/2023] [Indexed: 09/08/2023] Open
Abstract
IMPORTANCE Extraintestinal pathogenic Escherichia coli (ExPEC) sequence type (ST) 38 is one of the top 10 human pandemic lineages. Although a major cause of urinary tract and blood stream infections, ST38 has been poorly characterized from a global phylogenomic perspective. A comprehensive genome-scale analysis of 925 ST38 isolate genomes identified two broad ancestral clades and linkage of discrete ST38 clusters with specific bla CTX-M variants. In addition, the clades and clusters carry important virulence genes, with diverse but poorly characterized plasmids. Numerous putative interhost and environment transmission events were identified here by the presence of ST38 clones (defined as isolates with ≤35 SNPs) within humans, companion animals, food sources, urban birds, wildlife, and the environment. A small cluster of international ST38 clones from diverse sources, likely representing progenitors of a hospital outbreak that occurred in Brisbane, Australia, in 2017, was also identified. Our study emphasizes the importance of characterizing isolate genomes derived from nonhuman sources and geographical locations, without any selection bias.
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Affiliation(s)
- Piklu Roy Chowdhury
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Priyanka Hastak
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Matthew DeMaere
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Ethan Wyrsch
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Dmitriy Li
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Paarthiphan Elankumaran
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Monika Dolejska
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
- Central European Institute of Technology (CEITEC), University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic
- Department of Biology and Wildlife Disease, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic
- Biomedical Center, Charles University, Brno, Czech Republic
- Department of Clinical Microbiology and Immunology, Institute of Laboratory Medicine, The University Hospital, Brno, Czech Republic
| | - Glenn F. Browning
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, University of Melbourne, Parkville, Melbourne, Victoria, Australia
| | - Mark S. Marenda
- Asia-Pacific Centre for Animal Health, Melbourne Veterinary School, University of Melbourne, Parkville, Melbourne, Victoria, Australia
| | - Thomas Gottlieb
- Department of Microbiology and Infectious Diseases, Concord Hospital and NSW Health Pathology, Hospital Road, Concord, New South Wales, Australia
- Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia
| | - Elaine Cheong
- Department of Microbiology and Infectious Diseases, Concord Hospital and NSW Health Pathology, Hospital Road, Concord, New South Wales, Australia
- Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia
| | - John Merlino
- Department of Microbiology and Infectious Diseases, Concord Hospital and NSW Health Pathology, Hospital Road, Concord, New South Wales, Australia
- Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia
| | - Garry S. A. Myers
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
| | - Steven P. Djordjevic
- Australian Institute for Microbiology & Infection, University of Technology Sydney, Ultimo, Sydney, New South Wales, Australia
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9
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Monfardini MV, Souza RT, Rojas TCG, Guerrieri CG, Orikaza C, Scaletsky ICA. Transposon mutagenesis of atypical enteroaggregative Escherichia coli reveals a hemagglutinin-associated protein that mediates cell adhesion and contributes to the Galleria mellonella virulence. Front Cell Infect Microbiol 2023; 13:1166158. [PMID: 37424788 PMCID: PMC10327481 DOI: 10.3389/fcimb.2023.1166158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 06/01/2023] [Indexed: 07/11/2023] Open
Abstract
Twenty-two atypical enteroaggregative Escherichia coli isolates from a previous epidemiological study harboring EAEC virulence genes were examined for their adhesion properties. Nine strains showed a typical aggregative adherence (AA) pattern, while 13 strains showed variant AA, such as AA with lined up cells characteristic of the chain-like adhesion (CLA) and AA mainly to HeLa cells characteristic of the diffuse adherence (DA). The aggregative forming pilus (AFP) genes afpA2 and afpR were detected only in strain Q015B, which exhibited an AA/DA pattern. Using Tn5-based transposon mutagenesis on Q015B strain, we identified a 5517-bp open reading frame (ORF) encoding a predicted 1838-amino-acid polypeptide that is genetically related to a putative filamentous hemagglutinin identified in E. coli strain 7-233-03_S3_C2. Therefore, the ORF was named orfHA. The regions flanking orfHA were sequenced and two ORFs were found; upstream, an ORF that encodes a 603-amino-acid polypeptide with 99% identity to hemolysin secretion/activation proteins of the ShlB/FhaC/HecB family, and downstream, another ORF, which encodes a 632-amino-acid polypeptide with 72% identity to the glycosyltransferase EtpC. An orfHA mutant (Q015BΔorfHA) was constructed from strain Q015B. Q015BΔorfHA strain did not adhere to HeLa cells, whereas Q015BΔ orfHA transformed with a pACYC184 plasmid carrying orfHA restored the AA/DA phenotype of strain Q015B. Furthermore, the Q015ΔorfHA mutant had a marked effect on the ability of strain Q015B to kill the larvae of Galleria mellonella. Our results suggest that the AA/DA pattern of strain Q015B is mediated by a hemagglutinin-associated protein which also contributes to its virulence in the G. mellonella model.
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Affiliation(s)
- Mariane V. Monfardini
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil
| | - Renata T. Souza
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil
| | - Thais C. G. Rojas
- Departamento de Genética, Evolução e Bioagentes, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, Brazil
| | - Caroline G. Guerrieri
- Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, Brazil
| | - Cristina Orikaza
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil
| | - Isabel C. A. Scaletsky
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil
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Genetic and Antimicrobial Resistance Profiles of Mammary Pathogenic E. coli (MPEC) Isolates from Bovine Clinical Mastitis. Pathogens 2022; 11:pathogens11121435. [PMID: 36558768 PMCID: PMC9781227 DOI: 10.3390/pathogens11121435] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/24/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022] Open
Abstract
Mammary pathogenic E. coli (MPEC) is one of the main pathogens of environmental origin responsible for causing clinical mastitis worldwide. Even though E. coli are strongly associated with transient or persistent mastitis and the economic impacts of this disease, the virulence factors involved in the pathogenesis of MPEC remain unknown. Our aim was to characterize 110 MPEC isolates obtained from the milk of cows with clinical mastitis, regarding the virulence factor-encoding genes present, adherence patterns on HeLa cells, and antimicrobial resistance profile. The MPEC isolates were classified mainly in phylogroups A (50.9%) and B1 (38.2%). None of the isolates harbored genes used for diarrheagenic E. coli classification, but 26 (23.6%) and 4 (3.6%) isolates produced the aggregative or diffuse adherence pattern, respectively. Among the 22 genes investigated, encoding virulence factors associated with extraintestinal pathogenic E. coli pathogenesis, fimH (93.6%) was the most frequent, followed by traT (77.3%) and ompT (68.2%). Pulsed-field gel electrophoresis analysis revealed six pulse-types with isolates obtained over time, thus indicating persistent intramammary infections. The genes encoding beta-lactamases detected were as follows: blaTEM (35/31.8%); blaCTX-M-2/blaCTX-M-8 (2/1.8%); blaCTX-M-15 and blaCMY-2 (1/0.9%); five isolates were classified as extended spectrum beta-lactamase (ESBL) producers. As far as we know, papA, shf, ireA, sat and blaCTX-M-8 were detected for the first time in MPEC. In summary, the genetic profile of the MPEC studied was highly heterogeneous, making it impossible to establish a common genetic profile useful for molecular MPEC classification. Moreover, the detection of ESBL-producing isolates is a serious public health concern.
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Schüroff PA, Andrade FB, Pelayo JS. Virulence markers, adhesion and biofilm formation of Escherichia coli strains isolated from drinking water supplies of north Paraná State, Brazil. JOURNAL OF WATER AND HEALTH 2022; 20:1416-1424. [PMID: 36170195 DOI: 10.2166/wh.2022.128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Waterborne diseases are a major public health problem responsible for a high number of deaths worldwide, of which Escherichia coli is a major agent of contamination. This study investigates the occurrence of different diarrheagenic E. coli (DEC) pathotypes and its relationship with adherence patterns and biofilm formation. Between 2012 and 2014, a total of 1,780 drinking water samples were collected from different rural communities and urban water systems of north Paraná State. A total of 14% were positive for E. coli and 250 non-duplicate E. coli isolates were obtained. Between the E. coli isolates, 28 (11.2%) harbored DEC-associated genes, 10.7% being classified as Shiga toxin-producing E. coli (STEC), 64.3% enteroaggregative E. coli (EAEC) and 25% atypical enteropathogenic E. coli (aEPEC). The aggregative adherence (AA) was the predominant adherence pattern (84%), significantly associated with biofilm formation (p < 0.0001). On the other hand, the AA pattern and biofilm formation were not significantly associated to DEC pathotypes (p > 0.05). Therefore, we proposed that the AA pattern and biofilm formation in E. coli isolated from drinking water supplies could be associated with adherence and colonization of abiotic surfaces, such as pipes, leading to persistence and resistance to treatment or disinfection.
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Affiliation(s)
- Paulo Alfonso Schüroff
- Laboratório de Bacteriologia, Universidade Estadual de Londrina (UEL), Londrina, Brazil E-mail:
| | | | - Jacinta Sanchez Pelayo
- Laboratório de Bacteriologia, Universidade Estadual de Londrina (UEL), Londrina, Brazil E-mail:
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12
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Site specific incidence rate of virulence related genes of enteroaggregative Escherichia coli and association with enteric inflammation and growth in children. Sci Rep 2021; 11:23178. [PMID: 34848801 PMCID: PMC8632913 DOI: 10.1038/s41598-021-02626-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 11/15/2021] [Indexed: 01/19/2023] Open
Abstract
There is a lack of information highlighting the possible association between strain carrying genes of enteroaggregative Escherichia coli (EAEC) and environmental enteric dysfunction (EED) and on linear growth during childhood. Strain carrying genes of EAEC from stool samples collected from 1705 children enrolled in the MAL-ED birth cohort were detected by TaqMan Array Cards. We measured site-specific incidence rate by using Poisson regression models, identified the risk factors and estimated the associations of strain carrying genes of EAEC with the composite EED score and linear growth at 24 months of age. Overall highest incidence rate (43.3%) was found among children having infection with the aggR gene, which was the greatest in Tanzania (56.7%). Low maternal education, lack of improved floor, and ownership of domestic cattle were found to be risk factors for EAEC infection. In the multivariate models, after adjusting the potential covariates, strain carrying genes of EAEC showed strong positive associations with the EED scores and with poor linear growth at 24 months of age. Our analyses may lay the cornerstone for a prospective epidemiologic investigation for a potential vaccine development aimed at reducing the burden of EAEC infections and combat childhood malnutrition.
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Navarro A, van der Ploeg C, Rogé A, Licona-Moreno D, Delgado G, Morales-Espinosa R, Cravioto A, Eslava C. Diversity of Potentially Pathogenic Escherichia coli O104 and O9 Serogroups Isolated before 2011 from Fecal Samples from Children from Different Geographic Regions. Microorganisms 2021; 9:2227. [PMID: 34835353 PMCID: PMC8619403 DOI: 10.3390/microorganisms9112227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 10/20/2021] [Accepted: 10/22/2021] [Indexed: 11/21/2022] Open
Abstract
In 2011, an outbreak of hemorrhagic colitis and hemolytic uremic syndrome (HUS) was reported in Europe that was related to a hybrid STEAEC of Escherichia coli (E. coli) O104:H4 strain. The current study aimed to analyze strains of E. coli O104 and O9 isolated before 2011. The study included 47 strains isolated from children with and without diarrhea between 1986 and 2009 from different geographic regions, as well as seven reference strains. Serotyping was carried out on 188 anti-O and 53 anti-H sera. PCR was used to identify DEC genes and phylogenetic groups. Resistance profiles to antimicrobials were determined by diffusion in agar, while PFGE was used to analyze genomic similarity. Five serotypes of E. coli O104 and nine of O9 were identified, as well as an antigenic cross-reaction with one anti-E. coli O9 serum. E. coli O104 and O9 presented diarrheagenic E. coli (DEC) genes in different combinations and were located in commensal phylogenetic groups with different antimicrobial resistance. PFGE showed that O104:H4 and O9:(H4, NM) strains from SSI, Bangladesh and México belong to a diverse group located in the same subgroup. E. coli O104 and O9 were classified as commensal strains containing DEC genes. The groups were genetically diverse with pathogenic potential making continued epidemiologic surveillance important.
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Affiliation(s)
- Armando Navarro
- Public Health Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Ciudad Universitaria, México City 04510, Mexico;
| | - Claudia van der Ploeg
- Servicio de Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos (INPB)—ANLIS “Dr. Carlos G. Malbrán”, Buenos Aires 1282, Argentina; (C.v.d.P.); (A.R.)
| | - Ariel Rogé
- Servicio de Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos (INPB)—ANLIS “Dr. Carlos G. Malbrán”, Buenos Aires 1282, Argentina; (C.v.d.P.); (A.R.)
| | - Delia Licona-Moreno
- Public Health Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Avenida Universidad 3000, Ciudad Universitaria, México City 04510, Mexico;
| | - Gabriela Delgado
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, México City 04510, Mexico; (G.D.); (R.M.-E.)
| | - Rosario Morales-Espinosa
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, México City 04510, Mexico; (G.D.); (R.M.-E.)
| | - Alejandro Cravioto
- Faculty of Medicine, Universidad Nacional Autónoma de México, México City 04510, Mexico;
| | - Carlos Eslava
- Peripheral Unit of Basic and Clinical Research in Infectious Diseases, Public Health Department, Research Division, Faculty of Medicine Universidad Nacional Autónoma de México, Bacterial Pathogenicity Laboratory, Hemato-Oncology and Research Unit, Children’s Hospital of Mexico Federico Gómez, Dr. Márquez 162, Col. De los Doctores, México City 06720, Mexico;
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Modgil V, Chaudhary P, Bharti B, Mahindroo J, Yousuf M, Koundal M, Mohan B, Taneja N. Prevalence, Virulence Gene Profiling, and Characterization of Enteroaggregative Escherichia coli from Children with Acute Diarrhea, Asymptomatic Nourished, and Malnourished Children Younger Than 5 Years of Age in India. J Pediatr 2021; 234:106-114.e5. [PMID: 33713662 DOI: 10.1016/j.jpeds.2021.03.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 03/04/2021] [Accepted: 03/05/2021] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To study the significance of enteroaggregative Escherichia coli (EAEC) as a pathogen causing acute diarrhea and a commensal in healthy nourished and malnourished children younger than five years of age in the Chandigarh region and to address possible traits of EAEC virulence genes, biofilm formation, phylogroups, and antibiotic resistance that would be correlated with diarrhea or carriage. STUDY DESIGN Stool samples were obtained from children with acute diarrhea (n = 548), as well as nourished (n = 550), and malnourished controls without diarrhea (n = 110). E coli isolates were confirmed as EAEC by pCVD432 polymerase chain reaction. Multiplex polymerase chain reactions were used to identify 22 virulence-related genes and phylogeny. Antibiotic susceptibility, adherence, and biofilm-forming potential also were studied. RESULTS Overall, 16.6% of children were malnourished. EAEC detection was greater among children with acute diarrhea (16%) than nourished (6%) and malnourished nondiarrheal controls (2.7%). We found an association of EAEC infections with age <2 years (P = .0001) in the diarrheal group. Adhesive variants adhesion fimbriae IV and adhesion fimbriae II were significantly associated with diarrhea. The aggR and aar genes showed a positive and negative association with the severity of disease (P = .0004 and P = .0003). A high degree of multidrug resistance was found (73.8%) in the diarrheal group. Most EAEC strains from the diarrheal group belonged to B2 and D phylogroups, whereas strains from non-diarrheal groups, which belonged to phylogroup B1. CONCLUSIONS EAEC is a significant contributor to childhood diarrhea, its presence as a commensal, and the significance of the association of various virulence factors among the EAEC isolated from diarrheal and non-diarrheal stools. These data reinforce the importance of aggR and aar as positive and negative regulators and the contribution of AAF/II and AAF/IV fimbria for the pathobiology of EAEC.
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Affiliation(s)
- Vinay Modgil
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Pankaj Chaudhary
- Department of Pediatrics Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Bhavneet Bharti
- Department of Pediatrics Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Jaspreet Mahindroo
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Md Yousuf
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Meenakshi Koundal
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Balvinder Mohan
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Neelam Taneja
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
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15
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Makarova MA, Kaftyreva LA. Genetic diversity of enteroaggregative Escherichia coli. Klin Lab Diagn 2021; 65:707-711. [PMID: 33301661 DOI: 10.18821/0869-2084-2020-65-11-707-711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Studied 74 E. coli strains isolated from stool samples (60) and urine samples (14) of patients examined for clinical indications. Molecular methods included: PCR with electrophoretic detection of genes associated with diarrheal E. coli pathogroup EAgEC (aggR, aaf, aap, aatA, pet, ast, aai) and ExPEC pathogroup UPEC (pap, sfa, afa, kpsMT II, iutA, hlyA, cnf), MLST typing, whole genome sequencing. Strains isolated from stool samples were significantly more likely (88.3%, p > 0.05) to be typical EAgECaggR+ compared to atypical EAgECaggR-. Strains isolated from urine samples, significant differences between typical and atypical EAgEC were not detected (p > 0.05). Genes associated with ExPEC were present in all strains isolated from urine samples and in 45 strains (75%) isolated from stool samples. Coproisolates belonged to 10 serogroups and 13 serovars: O3:H2, O11:H10, O16:H48, O51:H30, O55:H21, O73:H18, O73:H33, O86:H2, O86:H10, O92:H33, O140:H2, O159:H10. Two strains had unique nucleotide sequences of genes encoding O-antigens that were missing from the SerotypeFinder database. 80% of EAgEC isolated from feces and urine was characterized by an enteroaggregative/uropathogenic genotype (EAgEC/UPEC). Most of the strains isolated from urine belonged to the virulent clone of high-risk epidemic spread ST 38 associated with hybrid strains of UPEC / EAgEC.
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Affiliation(s)
- M A Makarova
- Saint-Petersburg Pasteur Institute.,North-Western State Medical University named after I.I. Mechnikov, the medical microbiology department
| | - L A Kaftyreva
- Saint-Petersburg Pasteur Institute.,North-Western State Medical University named after I.I. Mechnikov, the medical microbiology department
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Molecular Epidemiology of Enteroaggregative Escherichia coli (EAEC) Isolates of Hospitalized Children from Bolivia Reveal High Heterogeneity and Multidrug-Resistance. Int J Mol Sci 2020; 21:ijms21249543. [PMID: 33334000 PMCID: PMC7765457 DOI: 10.3390/ijms21249543] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 12/10/2020] [Accepted: 12/12/2020] [Indexed: 12/16/2022] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) is an emerging pathogen frequently associated with acute diarrhea in children and travelers to endemic regions. EAEC was found the most prevalent bacterial diarrheal pathogen from hospitalized Bolivian children less than five years of age with acute diarrhea from 2007 to 2010. Here, we further characterized the epidemiology of EAEC infection, virulence genes, and antimicrobial susceptibility of EAEC isolated from 414 diarrheal and 74 non-diarrheal cases. EAEC isolates were collected and subjected to a PCR-based virulence gene screening of seven virulence genes and a phenotypic resistance test to nine different antimicrobials. Our results showed that atypical EAEC (a-EAEC, AggR-negative) was significantly associated with diarrhea (OR, 1.62, 95% CI, 1.25 to 2.09, p < 0.001) in contrast to typical EAEC (t-EAEC, AggR-positive). EAEC infection was most prevalent among children between 7–12 months of age. The number of cases exhibited a biannual cycle with a major peak during the transition from warm to cold (April–June). Both typical and a-EAEC infections were graded as equally severe; however, t-EAEC harbored more virulence genes. aap, irp2 and pic were the most prevalent genes. Surprisingly, we detected 60% and 52.6% of multidrug resistance (MDR) EAEC among diarrheal and non-diarrheal cases. Resistance to ampicillin, sulfonamides, and tetracyclines was most common, being the corresponding antibiotics, the ones that are frequently used in Bolivia. Our work is the first study that provides comprehensive information on the high heterogenicity of virulence genes in t-EAEC and a- EAEC and the large prevalence of MDR EAEC in Bolivia.
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Modgil V, Mahindroo J, Narayan C, Kalia M, Yousuf M, Shahi V, Koundal M, Chaudhary P, Jain R, Sandha KS, Tanwar S, Gupta P, Thakur K, Singh D, Gautam N, Kakkar M, Bharti B, Mohan B, Taneja N. Comparative analysis of virulence determinants, phylogroups, and antibiotic susceptibility patterns of typical versus atypical Enteroaggregative E. coli in India. PLoS Negl Trop Dis 2020; 14:e0008769. [PMID: 33206643 PMCID: PMC7673547 DOI: 10.1371/journal.pntd.0008769] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 09/01/2020] [Indexed: 11/30/2022] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) is an evolving enteric pathogen that causes acute and chronic diarrhea in developed and industrialized nations in children. EAEC epidemiology and the importance of atypical EAEC (aEAEC) isolation in childhood diarrhea are not well documented in the Indian setting. A comparative analysis was undertaken to evaluate virulence, phylogeny, and antibiotic sensitivity among typical tEAEC versus aEAEC. A total of 171 EAEC isolates were extracted from a broad surveillance sample of diarrheal (N = 1210) and healthy children (N = 550) across North India. Polymerase chain reaction (PCR) for the aggR gene (master regulator gene) was conducted to differentiate tEAEC and aEAEC. For 21 virulence genes, we used multiplex PCR to classify possible virulence factors among these strains. Phylogenetic classes were identified by a multiplex PCR for chuA, yjaA, and a cryptic DNA fragment, TspE4C2. Antibiotic susceptibility was conducted by the disc diffusion method as per CLSI guidelines. EAEC was associated with moderate to severe diarrhea in children. The prevalence of EAEC infection (11.4%) was higher than any other DEC group (p = 0.002). tEAEC occurrence in the diarrheal group was higher than in the control group (p = 0.0001). tEAEC strain harbored more virulence genes than aEAEC. astA, aap, and aggR genes were most frequently found in the EAEC from the diarrheal population. Within tEAEC, this gene combination was present in more than 50% of strains. Also, 75.8% of EAEC strains were multidrug-resistant (MDR). Phylogroup D (43.9%) and B1 (39.4%) were most prevalent in the diarrheal and control group, respectively. Genetic analysis revealed EAEC variability; the comparison of tEAEC and aEAEC allowed us to better understand the EAEC virulence repertoire. Further microbiological and epidemiological research is required to examine the pathogenicity of not only typical but also atypical EAEC. Enteroaggregative E. coli (EAEC) are an increasingly important cause of diarrhea. E. coli belonging to this category cause watery diarrhea, which is often persistent and can be inflammatory. It is also associated with traveler’s diarrhea in children and adults in middle and high-income countries. EAEC are defined by their ability to adhere to epithelial cells in a characteristic stacked brick-like pattern. However, the identification of these pathogenic strains remains elusive because of its heterogeneous nature. Genes that could contribute to the pathogenicity of EAEC encode adhesions, toxins, and other factors. Due to the heterogeneity of EAEC strains and differing host immune responses, not all EAEC infections are symptomatic. A critical factor in both recognizing EAEC pathogenesis and defining typical EAEC (tEAEC) strains is AggR, a transcriptional control for many EAEC virulence genes. The central role of aggR in virulence confers a strong priority to understand its pathogenicity. To identify EAEC, the CVD432 probe has been used. The CVD432 is a DNA probe from pAA plasmid of EAEC, has been reported to be specific for the detection of EAEC. The lack of sensitivity comes from the genetic heterogeneity of the EAEC strains and the wide geographic dispersal of strains. In our study, we performed a large surveillance of EAEC from North India among the pediatric population. Samples were collected by the microbiology staff at the Postgraduate Institute of Medical Education and Research (PGIMER) and referral system labs in Chandigarh (Manimajra), Punjab (Ludhiana), Haryana (Panchkula and Ambala Cantt), Himachal Pradesh (Hamirpur, Shimla, and Tanda), and Uttarakhand (Rishikesh, Rudrapur, and Haridwar)]. PGIMER is the largest tertiary care hospital in North India and serves patients from across Punjab, Jammu and Kashmir, Himachal Pradesh and Haryana. EAEC infections were detected using molecular methods. In our finding, astA, aap, and aggR genes were most frequently found in the EAEC from the diarrheal population. Within tEAEC, this gene combination is present in more than 50% of strains and helps to differentiate tEAEC from aEAEC. Our collection of EAEC strains helps in finding an appropriate marker for the early detection of EAEC. Our signature sequence (astA, aap, and aggR) will be ideal as focus genes for EAEC identification, as well as tEAEC and aEAEC. The multidrug resistance (MDR) was observed in 75.8% of the EAEC strains. tEAEC exhibits resistance to a greater number of antibiotics with respect to aEAEC. The phylogenetic analysis revealed that EAEC phylogeny is diverse and dispersed in all the phylogroups.
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Affiliation(s)
- Vinay Modgil
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Jaspreet Mahindroo
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Chandradeo Narayan
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Manmohit Kalia
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Md Yousuf
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Varun Shahi
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Meenakshi Koundal
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Pankaj Chaudhary
- Department of Pediatrics Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh (PGIMER), India
| | - Ruby Jain
- Civil Hospital Manimajra, Chandigarh, India
| | | | | | - Pratima Gupta
- Department of Microbiology, All India Institute of Medical Sciences (AIIMS), Rishikesh, Uttarakhand, India
| | - Kamlesh Thakur
- Department of Microbiology, Dr. Rajendra Prasad Government Medical College Kangra (RPGMC), Himachal Pradesh, India
| | - Digvijay Singh
- Department of Microbiology, Indira Gandhi Medical college (IGMC), Shimla, Himachal Pradesh, India
| | - Neha Gautam
- Department of Microbiology, Indira Gandhi Medical college (IGMC), Shimla, Himachal Pradesh, India
| | | | - Bhavneet Bharti
- Department of Pediatrics Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh (PGIMER), India
| | - Balvinder Mohan
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
| | - Neelam Taneja
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
- * E-mail:
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Boisen N, Østerlund MT, Joensen KG, Santiago AE, Mandomando I, Cravioto A, Chattaway MA, Gonyar LA, Overballe-Petersen S, Stine OC, Rasko DA, Scheutz F, Nataro JP. Redefining enteroaggregative Escherichia coli (EAEC): Genomic characterization of epidemiological EAEC strains. PLoS Negl Trop Dis 2020; 14:e0008613. [PMID: 32898134 PMCID: PMC7500659 DOI: 10.1371/journal.pntd.0008613] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 09/18/2020] [Accepted: 07/20/2020] [Indexed: 11/19/2022] Open
Abstract
Although enteroaggregative E. coli (EAEC) has been implicated as a common cause of diarrhea in multiple settings, neither its essential genomic nature nor its role as an enteric pathogen are fully understood. The current definition of this pathotype requires demonstration of cellular adherence; a working molecular definition encompasses E. coli which do not harbor the heat-stable or heat-labile toxins of enterotoxigenic E. coli (ETEC) and harbor the genes aaiC, aggR, and/or aatA. In an effort to improve the definition of this pathotype, we report the most definitive characterization of the pan-genome of EAEC to date, applying comparative genomics and functional characterization on a collection of 97 EAEC strains isolated in the course of a multicenter case-control diarrhea study (Global Enteric Multi-Center Study, GEMS). Genomic analysis revealed that the EAEC strains mapped to all phylogenomic groups of E. coli. Circa 70% of strains harbored one of the five described AAF variants; there were no additional AAF variants identified, and strains that lacked an identifiable AAF generally did not have an otherwise complete AggR regulon. An exception was strains that harbored an ETEC colonization factor (CF) CS22, like AAF a member of the chaperone-usher family of adhesins, but not phylogenetically related to the AAF family. Of all genes scored, sepA yielded the strongest association with diarrhea (P = 0.002) followed by the increased serum survival gene, iss (p = 0.026), and the outer membrane protease gene ompT (p = 0.046). Notably, the EAEC genomes harbored several genes characteristically associated with other E. coli pathotypes. Our data suggest that a molecular definition of EAEC could comprise E. coli strains harboring AggR and a complete AAF(I-V) or CS22 gene cluster. Further, it is possible that strains meeting this definition could be both enteric bacteria and urinary/systemic pathogens.
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Affiliation(s)
- Nadia Boisen
- Statens Serum Institut, Department of Bacteria, Parasites and Fungi, Copenhagen, Denmark
| | - Mark T. Østerlund
- Statens Serum Institut, Department of Bacteria, Parasites and Fungi, Copenhagen, Denmark
| | - Katrine G. Joensen
- Statens Serum Institut, Department of Bacteria, Parasites and Fungi, Copenhagen, Denmark
| | - Araceli E. Santiago
- University of Virginia School of Medicine, Department of Pediatrics, Charlottesville, Virginia, United States of America
| | - Inacio Mandomando
- Centro de Investigação em Saúde da Manhiça (CISM), Maputo, Mozambique
| | - Alejandro Cravioto
- Universidad Nacional Autónoma de México, Faculty of Medicine, Mexico City, Mexico
| | - Marie A. Chattaway
- Public Health England, Gastrointestinal Bacteria Reference Unit (GBRU), Colindale, United Kingdom
| | - Laura A. Gonyar
- University of Virginia School of Medicine, Department of Pediatrics, Charlottesville, Virginia, United States of America
| | | | - O. Colin Stine
- University of Maryland School of Medicine, Department of Epidemiology and Public Health, Baltimore, Maryland, United States of America
| | - David A. Rasko
- University of Maryland School of Medicine, Institute for Genome Sciences, Department of Microbiology and Immunology, Baltimore, Maryland, United States of America
| | - Flemming Scheutz
- Statens Serum Institut, Department of Bacteria, Parasites and Fungi, Copenhagen, Denmark
| | - James P. Nataro
- University of Virginia School of Medicine, Department of Pediatrics, Charlottesville, Virginia, United States of America
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19
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Belmont-Monroy L, Saitz-Rojas W, Soria-Bustos J, Mickey AS, Sherman NE, Orsburn BC, Ruiz-Perez F, Santiago AE. Characterization of a novel AraC/XylS-regulated family of N-acyltransferases in pathogens of the order Enterobacterales. PLoS Pathog 2020; 16:e1008776. [PMID: 32845938 PMCID: PMC7478709 DOI: 10.1371/journal.ppat.1008776] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 09/08/2020] [Accepted: 07/04/2020] [Indexed: 11/18/2022] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) is a diarrheagenic pathotype associated with traveler’s diarrhea, foodborne outbreaks and sporadic diarrhea in industrialized and developing countries. Regulation of virulence in EAEC is mediated by AggR and its negative regulator Aar. Together, they control the expression of at least 210 genes. On the other hand, we observed that about one third of Aar-regulated genes are related to metabolism and transport. In this study we show the AggR/Aar duo controls the metabolism of lipids. Accordingly, we show that AatD, encoded in the AggR-regulated aat operon (aatPABCD) is an N-acyltransferase structurally similar to the essential Apolipoprotein N-acyltransferase Lnt and is required for the acylation of Aap (anti-aggregation protein). Deletion of aatD impairs post-translational modification of Aap and causes its accumulation in the bacterial periplasm. trans-complementation of 042aatD mutant with the AatD homolog of ETEC or with the N-acyltransferase Lnt reestablished translocation of Aap. Site-directed mutagenesis of the E207 residue in the putative acyltransferase catalytic triad disrupted the activity of AatD and caused accumulation of Aap in the periplasm due to reduced translocation of Aap at the bacterial surface. Furthermore, Mass spectroscopy revealed that Aap is acylated in a putative lipobox at the N-terminal of the mature protein, implying that Aap is a lipoprotein. Lastly, deletion of aatD impairs bacterial colonization of the streptomycin-treated mouse model. Our findings unveiled a novel N-acyltransferase family associated with bacterial virulence, and that is tightly regulated by AraC/XylS regulators in the order Enterobacterales. Although the regulatory scheme of AggR is well understood, the biological relevance of half of AggR-regulated proteins remains unknown. In this study we provide experimental evidence that the AggR-regulated AatD is a novel N-acyltransferase restricted to pathogens of the order Enterobacterales, including EAEC, ETEC, Yersinia sp., and C. rodentium. AatD is structurally similar to Lnt. However, unlike Lnt which is essential for cellular functions, AatD is a dedicated N-acyltransferase required for post-translational modification of virulence factors. Aap was identified as a lipoprotein acylated by AatD. Lipid modification in Aap provides an important post-translational mechanism to regulate the trafficking, stability and subcellular localization of Aap. In the absence of AatD, Aap is retained in the periplasmic space and cannot be translocated to the bacterial surface, presumably, restricting the biological function of the protein. Our data suggest that AggR and Aar virulence regulators, not only regulate the expression of Aap virulence factor at the transcriptional level, but also regulate translocation of Aap to the bacterial surface, which is required for full virulence of EAEC, unveiling an important mechanism of virulence regulation.
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Affiliation(s)
- Laura Belmont-Monroy
- Department of Pediatrics, University of Virginia School of Medicine and University of Virginia Children’s Hospital, Charlottesville, Virginia, United States of America
- Department of Public Health, UNAM School of Medicine and Federico Gomez Children’s Hospital, Mexico City, Mexico
| | - Waleska Saitz-Rojas
- Department of Pediatrics, University of Virginia School of Medicine and University of Virginia Children’s Hospital, Charlottesville, Virginia, United States of America
| | - Jorge Soria-Bustos
- Department of Pediatrics, University of Virginia School of Medicine and University of Virginia Children’s Hospital, Charlottesville, Virginia, United States of America
| | - Abigail S. Mickey
- Department of Pediatrics, University of Virginia School of Medicine and University of Virginia Children’s Hospital, Charlottesville, Virginia, United States of America
| | - Nicholas E. Sherman
- W. M. Keck Biomedical Mass Spectrometry Lab. University of Virginia, Charlottesville, Virginia, United States of America
| | - Benjamin C. Orsburn
- W. M. Keck Biomedical Mass Spectrometry Lab. University of Virginia, Charlottesville, Virginia, United States of America
| | - Fernando Ruiz-Perez
- Department of Pediatrics, University of Virginia School of Medicine and University of Virginia Children’s Hospital, Charlottesville, Virginia, United States of America
| | - Araceli E. Santiago
- Department of Pediatrics, University of Virginia School of Medicine and University of Virginia Children’s Hospital, Charlottesville, Virginia, United States of America
- * E-mail: .
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20
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Mostafa HH, Cameron A, Taffner SM, Wang J, Malek A, Dumyati G, Hardy DJ, Pecora ND. Genomic Surveillance of Ceftriaxone-Resistant Escherichia coli in Western New York Suggests the Extended-Spectrum β-Lactamase bla CTX-M-27 Is Emerging on Distinct Plasmids in ST38. Front Microbiol 2020; 11:1747. [PMID: 32849376 PMCID: PMC7406970 DOI: 10.3389/fmicb.2020.01747] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/03/2020] [Indexed: 12/20/2022] Open
Abstract
Extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae pose significant treatment and infection prevention challenges. Escherichia coli sequence type (ST) 131 associated with the blaCTX-M-15 gene has been the dominant lineage of ESBL-producing E. coli in the US and worldwide. In this study, our objective was to determine the β-lactamase profile, means of dissemination, prevalence, and the clonal identity of ESBL-producing E. coli in our region of Western New York. Whole-genome SNP-based phylogenomics was used to assess 89 ceftriaxone-resistant (CTR) E. coli. Isolates were collected from both inpatients and outpatients and from urine and sterile-sites over a 2 month period in 2017 or throughout the year, respectively. ST131 was the predominant ST (46.0%), followed by ST38 (15.7%). The blaCTX-M-15 gene was commonly found in 53.7% of ST131 isolates, whereas the blaCTX-M-27 gene was found in 26.8% of ST131, though was significantly associated with ST38, and was found in 71.4% of those strains. When compared to ST131, ST38 E. coli exhibited increased frequency of resistance to nitrofurantoin and decreased frequency of resistance to ciprofloxacin and ampicillin-sulbactam. Using Nanopore long-read sequencing technology, an analysis of the ESBL genetic context showed that the blaCTX-M-15 gene was chromosomal in 68.2% of ST131, whereas the blaCTX-M-27 gene was plasmid-borne in all ST131 and 90% of ST38 isolates. Notably, the blaCTX-M-27 gene in ST38 resided on highly-related (99.0–100.0% identity and 65.0–98.0% query coverage) conjugative IncF plasmids of distinct plasmid multi-locus sequence types (pMLSTs) from those in ST131. Furthermore, ST131 and ST38 were found to harbor different antibiotic resistance gene and virulence factor profiles. These findings raise the possibility of an emerging ESBL-producing E. coli lineage in our region.
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Affiliation(s)
- Heba H Mostafa
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States.,Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Andrew Cameron
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States
| | - Samantha M Taffner
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States
| | - Jun Wang
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States
| | - Adel Malek
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States
| | - Ghinwa Dumyati
- Department of Medicine, Infectious Diseases, University of Rochester Medical Center, Rochester, NY, United States
| | - Dwight J Hardy
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States.,Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
| | - Nicole D Pecora
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, United States.,Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY, United States
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21
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Petro CD, Duncan JK, Seldina YI, Allué-Guardia A, Eppinger M, Riddle MS, Tribble DR, Johnson RC, Dalgard CL, Sukumar G, Connor P, Boisen N, Melton-Celsa AR. Genetic and Virulence Profiles of Enteroaggregative Escherichia coli (EAEC) Isolated From Deployed Military Personnel (DMP) With Travelers' Diarrhea. Front Cell Infect Microbiol 2020; 10:200. [PMID: 32509590 PMCID: PMC7251025 DOI: 10.3389/fcimb.2020.00200] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 04/16/2020] [Indexed: 02/01/2023] Open
Abstract
To discern if there was a particular genotype associated with clinical enteroaggregative Escherichia coli (EAEC) strains isolated from deployed military personnel (DMP) with travelers' diarrhea (TD), we characterized a collection of EAEC from DMP deployed to Afghanistan, Djibouti, Kenya, or Honduras. Although we did not identify a specific EAEC genotype associated with TD in DMP, we found that EAEC isolated at the first clinic visit were more likely to encode the dispersin gene aap than EAEC collected at follow-up visits. A majority of the EAEC isolates were typical EAEC that adhered to HEp-2 cells, formed biofilms, and harbored genes for aggregative adherence fimbriae (AAF), AggR, and serine protease autotransporters of Enterobacteriaceae (SPATEs). A separate subset of the EAEC had aggR and genes for SPATEs but encoded a gene highly homologous to that for CS22, a fimbriae more commonly found in enterotoxigenic E. coli. None of these CS22-encoding EAEC formed biofilms in vitro or adhered to HEp-2 cells. Whole genome sequence and single nucleotide polymorphism analyses demonstrated that most of the strains were genetically diverse, but that a few were closely related. Isolation of these related strains occurred within days to more than a year apart, a finding that suggests a persistent source and genomic stability. In an ampicillin-treated mouse model we found that an agg4A+ aar- isolate formed a biofilm in the intestine and caused reduced weight gain in mice, whereas a strain that did not form an in vivo biofilm caused no morbidity. Our diverse strain collection from DMP displays the heterogeneity of EAEC strains isolated from human patients, and our mouse model of infection indicated the genotype agg4A+ aar– and/or capacity to form biofilm in vivo may correlate to disease severity.
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Affiliation(s)
- Courtney D Petro
- Department of Microbiology and Immunolgy, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Jeffrey K Duncan
- Department of Microbiology and Immunolgy, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Yuliya I Seldina
- Walter Reed National Military Medical Center, Bethesda, MD, United States
| | - Anna Allué-Guardia
- Department of Biology, The University of Texas at San Antonio, San Antonio, TX, United States.,South Texas Center for Emerging Infectious Diseases, San Antonio, TX, United States
| | - Mark Eppinger
- Department of Biology, The University of Texas at San Antonio, San Antonio, TX, United States.,South Texas Center for Emerging Infectious Diseases, San Antonio, TX, United States
| | - Mark S Riddle
- Department of Preventative Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - David R Tribble
- Department of Preventative Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Ryan C Johnson
- Department of Preventative Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Clifton L Dalgard
- Department of Anatomy, Physiology and Genetics, Uniformed Services University of the Health Sciences, Bethesda, MD, United States.,The American Genome Center, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Gauthaman Sukumar
- The American Genome Center, Uniformed Services University of the Health Sciences, Bethesda, MD, United States.,Collaborative Health Initiative Research Program, Henry Jackson Foundation, Bethesda, MD, United States
| | - Patrick Connor
- Military Enteric Disease Group, Academic Department of Military Medicine, Birmingham, United Kingdom
| | - Nadia Boisen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Angela R Melton-Celsa
- Department of Microbiology and Immunolgy, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
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22
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Furlan JPR, da Silva Ferreira ME, Stehling EG. Genetic Diversity of Multidrug-Resistant CMY-Producing Escherichia coli from Feces and Soil in a Small-Scale Pig Farm. Microb Drug Resist 2020; 26:1365-1371. [PMID: 32379997 DOI: 10.1089/mdr.2020.0090] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Diarrheagenic Escherichia coli cause diarrheal diseases, which are a public health concern and affect mainly developing countries. Multidrug-resistant (MDR) pathogens have been spreading in different sources, including animals and the environment. E. coli strains were obtained from a small-scale pig farm and 33 antimicrobials were tested. All strains were classified as MDR and harbored several antimicrobial resistance genes (ARGs) [blaCMY, blaOXA-1-like, blaSHV, tet(A), tet(B), aadA, aac(6')-Ib, aph(3')-Ia, sul1, sul2, sul3, floR, and cmlA] and plasmids. Besides, mutations in quinolone resistance-determining region of GyrA (Ser83Leu and Asp87Asn) and ParC (Glu84Asp) were detected. Among the MDR E. coli, nine strains (52%) presented diarrheagenic virulence genes, including genes related to Shiga toxin-producing E. coli (STEC), enteroinvasive E. coli (EIEC), and enteroaggregative E. coli (EAEC). The pulsed-field gel electrophoresis results showed a high genetic diversity among the MDR E. coli strains. Multilocus sequence typing (MLST) analyses revealed different sequence types phylogenetically related to each other, including ST10 and ST56. Subtyping of MLST by fimH gene showed different fimH type. This study shows a high genetic diversity among MDR ARG-producing E. coli belonging to STEC, EIEC, and EAEC pathotypes obtained from a small-scale pig farm and contributes to the monitoring of antimicrobial-resistant pathogens worldwide, mainly in environmental samples, which are associated with One Health framework.
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Affiliation(s)
- João Pedro Rueda Furlan
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, Brazil
| | - Márcia Eliana da Silva Ferreira
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, Brazil
| | - Eliana Guedes Stehling
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, Brazil
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23
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Dias RCB, Tanabe RHS, Vieira MA, Cergole-Novella MC, Dos Santos LF, Gomes TAT, Elias WP, Hernandes RT. Analysis of the Virulence Profile and Phenotypic Features of Typical and Atypical Enteroaggregative Escherichia coli (EAEC) Isolated From Diarrheal Patients in Brazil. Front Cell Infect Microbiol 2020; 10:144. [PMID: 32391284 PMCID: PMC7188757 DOI: 10.3389/fcimb.2020.00144] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 03/19/2020] [Indexed: 12/24/2022] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) is an important agent of acute and persistent diarrhea in children and adults worldwide. Here we report a characterization of 220 EAEC isolates, 88.2% (194/220) of which were typical and 11.8% (26/220) were atypical, obtained from diarrheal patients during seven years (2010-2016) of epidemiological surveillance in Brazil. The majority of the isolates were assigned to phylogroups A (44.1%, 97/220) or B1 (21.4%, 47/220). The aggregative adherence (AA) pattern was detected in 92.7% (204/220) of the isolates, with six of them exhibiting AA concomitantly with a chain-like adherence pattern; and agg5A and agg4A were the most common adhesin-encoding genes, which were equally detected in 14.5% (32/220) of the isolates. Each of 12 virulence factor-encoding genes (agg4A, agg5A, pic, aap, aaiA, aaiC, aaiG, orf3, aar, air, capU, and shf) were statistically associated with typical EAEC (P < 0.05). The genes encoding the newly described aggregate-forming pili (AFP) searched (afpB, afpD, afpP, and afpA2), and/or its regulator (afpR), were exclusively detected in atypical EAEC (57.7%, 15/26), and showed a significant association with this subgroup of EAEC (P < 0.001). In conclusion, we presented an extensive characterization of the EAEC circulating in the Brazilian settings and identified the afp genes as putative markers for increasing the efficiency of atypical EAEC diagnosis.
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Affiliation(s)
- Regiane C B Dias
- Universidade Estadual Paulista (UNESP), Instituto de Biociências, São Paulo, Brazil
| | - Rodrigo H S Tanabe
- Universidade Estadual Paulista (UNESP), Instituto de Biociências, São Paulo, Brazil
| | - Melissa A Vieira
- Universidade Estadual Paulista (UNESP), Instituto de Biociências, São Paulo, Brazil
| | | | | | - Tânia A T Gomes
- Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo- Escola Paulista de Medicina (UNIFESP-EPM), São Paulo, Brazil
| | - Waldir P Elias
- Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil
| | - Rodrigo T Hernandes
- Universidade Estadual Paulista (UNESP), Instituto de Biociências, São Paulo, Brazil
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24
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Chukwu MO, Abia ALK, Ubomba-Jaswa E, Dewar JB, Obi C. Mixed Aetiology of Diarrhoea in Infants Attending Clinics in the North-West Province of South Africa: Potential for Sub-Optimal Treatment. Pathogens 2020; 9:E198. [PMID: 32155961 PMCID: PMC7157715 DOI: 10.3390/pathogens9030198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 11/28/2019] [Accepted: 12/01/2019] [Indexed: 11/17/2022] Open
Abstract
Routine diagnostic methods for the aetiologic agents of diarrhoea in most developing countries are usually not sensitive enough, leading to under-diagnosis. Thus, this study investigated possible mixed diarrhoeal aetiology by using cultures and real-time polymerase chain reactions (PCR) in children younger than four years old in the Northwest Province, South Africa. In total, 505 stool samples were collected from symptomatic and asymptomatic children who were attending three clinics and the Brits hospital in Madibeng District, between September 2016 and December 2017. Rotavirus, norovirus, Campylobacter, Arcobacter, and diarrhoeagenic Escherichia coli (DEC) were targeted. Campylobacter spp. (24.6%), Arcobacter (15.8%) and DEC (19.6%) were detected using PCR; only Campylobacter spp. (29.7%) and DEC (26.9%) were detected through the culture. Campylobacter jejuni (36%), Campylobacter coli (28%), Campylobacter upsalensis (12%), and Arcobacter butzleri (15.8%) were the only spp. of Campylobacter and Arcobacter identified. The eaeA gene (31.4%) of enteropathogenic E. coli/enterohaemorrhagic E. coli (EPEC/EHEC) was the most prevalent DEC virulence gene (VG) identified. Rotavirus and norovirus were detected at 23.4% and 20%, respectively. Mixed viral aetiology (7.3%) and the co-infection of A. butzleri and Campylobacter (49%) were recorded. A mixed bacterial-viral aetiology was observed in 0.6% of the specimens. Sensitive diagnostic procedures like PCR should be considered to provide the best treatment to children experiencing diarrhoea.
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Affiliation(s)
- Martina O. Chukwu
- Department of Life Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Corner Christiaan De wet and Pioneer Avenue, Florida Park, Roodepoort 1724, Gauteng, South Africa;
| | - Akebe Luther King Abia
- Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa;
| | - Eunice Ubomba-Jaswa
- Department of Biotechnology, University of Johannesburg, 37 Nind Street, Doornfontein 2094, Gauteng, South Africa;
- Water Research Commission, Lynnwood Bridge Office Park, Bloukrans Building, 4 Daventry Street, Lynnwood Manor, Pretoria 0081, South Africa
| | - John Barr Dewar
- Department of Life Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Corner Christiaan De wet and Pioneer Avenue, Florida Park, Roodepoort 1724, Gauteng, South Africa;
| | - C.L. Obi
- School of Science and Technology, Sefako Makgatho Health Science University, Ga-Rankuwa 0208, South Africa;
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25
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Montealegre MC, Talavera Rodríguez A, Roy S, Hossain MI, Islam MA, Lanza VF, Julian TR. High Genomic Diversity and Heterogenous Origins of Pathogenic and Antibiotic-Resistant Escherichia coli in Household Settings Represent a Challenge to Reducing Transmission in Low-Income Settings. mSphere 2020; 5:e00704-19. [PMID: 31941809 PMCID: PMC6968650 DOI: 10.1128/msphere.00704-19] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 12/14/2019] [Indexed: 11/25/2022] Open
Abstract
Escherichia coli is present in multiple hosts and environmental compartments as a normal inhabitant, temporary or persistent colonizer, and as a pathogen. Transmission of E. coli between hosts and with the environment is considered to occur more often in areas with poor sanitation. We performed whole-genome comparative analyses on 60 E. coli isolates from soils and fecal sources (cattle, chickens, and humans) in households in rural Bangladesh. Isolates from household soils were in multiple branches of the reconstructed phylogeny, intermixed with isolates from fecal sources. Pairwise differences between all strain pairs were large (minimum, 189 single nucleotide polymorphisms [SNPs]), suggesting high diversity and heterogeneous origins of the isolates. The presence of multiple virulence and antibiotic resistance genes is indicative of the risk that E. coli from soil and feces represent for the transmission of variants that pose potential harm to people. Analysis of the accessory genomes of the Bangladeshi E. coli relative to E. coli genomes available in NCBI identified a common pool of accessory genes shared among E. coli isolates in this geographic area. Together, these findings indicate that in rural Bangladesh, a high level of E. coli in soil is likely driven by contributions from multiple and diverse E. coli sources (human and animal) that share an accessory gene pool relatively unique to previously published E. coli genomes. Thus, interventions to reduce environmental pathogen or antimicrobial resistance transmission should adopt integrated One Health approaches that consider heterogeneous origins and high diversity to improve effectiveness and reduce prevalence and transmission.IMPORTANCEEscherichia coli is reported in high levels in household soil in low-income settings. When E. coli reaches a soil environment, different mechanisms, including survival, clonal expansion, and genetic exchange, have the potential to either maintain or generate E. coli variants with capabilities of causing harm to people. In this study, we used whole-genome sequencing to identify that E. coli isolates collected from rural Bangladeshi household soils, including pathogenic and antibiotic-resistant variants, are diverse and likely originated from multiple diverse sources. In addition, we observed specialization of the accessory genome of this Bangladeshi E. coli compared to E. coli genomes available in current sequence databases. Thus, to address the high level of pathogenic and antibiotic-resistant E. coli transmission in low-income settings, interventions should focus on addressing the heterogeneous origins and high diversity.
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Affiliation(s)
| | | | - Subarna Roy
- Food Microbiology Laboratory, Laboratory Sciences and Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Muhammed Iqbal Hossain
- Food Microbiology Laboratory, Laboratory Sciences and Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Mohammad Aminul Islam
- Food Microbiology Laboratory, Laboratory Sciences and Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, USA
| | - Val F Lanza
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal (IRYCIS), Madrid, Spain
| | - Timothy R Julian
- Eawag, Swiss Federal Institute of Science and Technology, Dübendorf, Switzerland
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
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Li X, Luo Q, Yu X, Zhang Y, Cao X, Li D. Diversity of Virulence Genes in Multidrug Resistant Escherichia coli from a Hospital in Western China. Infect Drug Resist 2019; 12:3817-3826. [PMID: 31824179 PMCID: PMC6901040 DOI: 10.2147/idr.s226072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/16/2019] [Indexed: 11/25/2022] Open
Abstract
Background Escherichia coli strains are the most commonly isolated bacteria in hospitals. The normally harmless commensal E. coli can become a highly adapted pathogen, capable of causing various diseases both in healthy and immunocompromised individuals, by acquiring a combination of mobile genetic elements. Our aim was to characterize E. coli strains from a hospital in western China to determine their virulence and antimicrobial resistance potential. Methods A total of 97 E. coli clinical isolates were collected from the First Affiliated Hospital of Chengdu Medical College from 2015 to 2016. Microbiological methods, PCR, and antimicrobial susceptibility tests were used in this study. Results The frequency of occurrence of the virulence genes fimC, irp2, fimH, fyuA, lpfA, hlyA, sat, and cnf1 in the E. coli isolates was 93.81, 92.78, 91.75, 84.54, 41.24, 32.99, 28.86, and 7.22%, respectively. Ninety-five (97.9%) isolates carried two or more different virulence genes. Of these, 44 (45.4%) isolates simultaneously harbored five virulence genes, 24 (24.7%) isolates harbored four virulence genes, and 17 (17.5%) isolates harbored six virulence genes. In addition, all E. coli isolates were multidrug resistant and had a high degree of antimicrobial resistance. Conclusion These results indicate a high frequency of occurrence and heterogeneity of virulence gene profiles among clinical multidrug resistant E. coli isolates. Therefore, appropriate surveillance and control measures are essential to prevent the further spread of these isolates in hospitals.
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Affiliation(s)
- Xue Li
- Non-Coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China
| | - Qi Luo
- Non-Coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China
| | - Xinyu Yu
- Non-Coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China
| | - Yanling Zhang
- Non-Coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China
| | - Xiaoyue Cao
- Non-Coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China
| | - Dan Li
- School of Medical Laboratory Science, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China.,Sichuan Provincial Engineering Laboratory for Prevention and Control Technology of Veterinary Drug Residue in Animal-Origin Food, Chengdu Medical College, Chengdu, Sichuan 610500, People's Republic of China
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Furlan JPR, Gallo IFL, de Campos ACLP, Passaglia J, Falcão JP, Navarro A, Nakazato G, Stehling EG. Molecular characterization of multidrug-resistant Shiga toxin-producing Escherichia coli harboring antimicrobial resistance genes obtained from a farmhouse. Pathog Glob Health 2019; 113:268-274. [PMID: 31757195 DOI: 10.1080/20477724.2019.1693712] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Shiga toxin-producing Escherichia coli (STEC) colonize the gastrointestinal tract of animals; however, STEC may also cause severe diarrheal diseases. Food-producing animals have been acting as reservoirs and disseminators of multidrug-resistant (MDR) bacteria and antimicrobial resistance genes (ARGs); however, there are few studies characterizing molecularly bacterial isolates from sheep. Therefore, this study aimed to characterize E. coli isolates obtained from feces of sheep in a Brazilian farmhouse. A total of 14 MDR E. coli isolates were obtained from 100 feces samples, six of which were classified as non-O157 STEC (stx1, stx2 and ehxA). MDR E. coli isolates presented different ARGs [blaCTX-M-Gp9, blaCMY, blaSHV, qnrS, oqxB, aac(6')-Ib, tet(A), tet(B), tet(C), sul1, sul2, and cmlA] and plasmids (IncI1, IncFrepB, IncFIB, IncFIA, IncHI1, IncK, and ColE-like). In addition, mutations in the quinolone-resistance determining region of GyrA (Ser83Leu; Asp87Asn) and ParC (Glu84Asp) were detected. PFGE showed a high genetic diversity (30.9 to 83.9%) and thirteen STs were detected (ST25, ST48, ST155, ST162, ST642, ST1247, ST1518, ST1725, ST2107, ST2522, ST3270, ST5036, and ST7100). Subtyping of the fimH gene showed seven fimH-type (25, 32, 38, 41, 54, 61, and 366). The results found in the present study showed high genetic diversity among MDR ARGs-producing E. coli obtained from a farmhouse. This study reports for the first time, the presence of MDR STEC and non-STEC belonging to ST25, ST162, ST642, ST1247, ST1518, ST1725, ST2107, ST3270, ST5036, and ST7100 in sheep, and contributes to the surveillance studies associated with One Health concept.
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Affiliation(s)
- João Pedro Rueda Furlan
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - Universidade de São Paulo (USP), Ribeirão Preto, Brasil
| | - Inara Fernanda Lage Gallo
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - Universidade de São Paulo (USP), Ribeirão Preto, Brasil
| | | | - Jaqueline Passaglia
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - Universidade de São Paulo (USP), Ribeirão Preto, Brasil
| | - Juliana Pfrimer Falcão
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - Universidade de São Paulo (USP), Ribeirão Preto, Brasil
| | - Armando Navarro
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autônoma de México, Ciudad Universitaria, Mexico City, Mexico
| | - Gerson Nakazato
- Departamento de Microbiologia, Centro de Ciências Biológicas - Universidade Estadual de Londrina (UEL), Londrina, Brasil
| | - Eliana Guedes Stehling
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - Universidade de São Paulo (USP), Ribeirão Preto, Brasil
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Gaio F, Lopes E, Lima B, Carmo C, Marques A, Oliveira F, Amaral M, Pascoal Filho N, Carreira A, Beleza A, Teixeira R, Havt A, Maciel W. Bactérias zoonóticas isoladas de Passeriformes silvestres recuperados do tráfico de animais no estado do Ceará/Brasil. ARQ BRAS MED VET ZOO 2019. [DOI: 10.1590/1678-4162-10092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
RESUMO A ordem dos Passeriformes é uma das mais pressionadas pelas ações antrópicas, especialmente as relativas ao tráfico de animais, que, devido às más condições de manejo e higiênico-sanitárias, favorecem a infecção dos espécimes por patógenos virulentos e zoonóticos, como cepas de Escherichia coli e Salmonella spp., cujo isolamento em suabes cloacais, bem como a análise dos genes de virulência das cepas de E. coli foram objetivos do estudo. Para isso, 120 Passeriformes silvestres nativos, recebidos pelo Cetas/CE, foram avaliados individualmente. As cepas isoladas foram submetidas a teste de disco difusão para determinação da sensibilidade aos antimicrobianos. Em etapa posterior, foi realizada PCR para a detecção de oito genes de virulência dos principais patotipos diarreiogênicos de E. coli. Quanto aos resultados, nenhuma cepa de Salmonella spp. foi isolada, no entanto a ocorrência de E. coli foi de 40,8%. Foi observada elevada resistência, principalmente aos antimicrobianos tetraciclina, ampicilina e sulfazotrim, ocorrendo multirresistência em 42,8% das cepas. Pela análise molecular, foram diagnosticados quatro entre os nove genes pesquisados, com a identificação de EPEC típicas, EPEC atípicas, ETEC, EHEC e EAEC. Os resultados apontam para a importância de Passeriformes como possíveis disseminadores de zoonoses.
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Affiliation(s)
- F.C. Gaio
- Universidade Estadual do Ceará, Brazil
| | | | - B.P. Lima
- Universidade Estadual do Ceará, Brazil
| | | | | | | | | | | | | | | | | | - A. Havt
- Universidade Federal do Ceará, Brazil
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Tanih NF, Bolick DT, Samie A, Nyathi E, Dillingham R, Pinkerton RC, Guerrant RL, Bessong PO. Prevalence of Virulence Genes in Enteroaggregative Escherichia coli Isolates from Young Children from Rural South Africa. Am J Trop Med Hyg 2019; 101:1027-1033. [PMID: 31516105 DOI: 10.4269/ajtmh.19-0192] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
In this study, we report on the prevalence of 19 virulence genes in enteroaggregative Escherichia coli (EAEC) isolates from northern South Africa. Stool samples obtained prospectively from 97 children from 1 to 12 months of age were analyzed, and EAEC isolates were confirmed based on the presence of aaiC or aatA genes. We investigated 177 enteroaggregative Escherichia coli isolates for the prevalence of virulence genes using multiplex polymerase chain reaction. The chromosomal gene aaiC was detected at higher frequency (48.0%) compared with aatA (26.0%). The gene encoding the open reading frame Orf61 was the most prevalent putative virulence trait detected among the isolates (150/177; 84.7%). None of the genes was statistically associated with diarrhea (P > 0.05). Detection rates were higher during 7-12 month of life with an association observed for the pic gene and the age group 7-12 months (P = 0.04). Winter was the season with the highest detection rates. Our data reveal a high prevalence of Orf61, Orf3, and astA in South African EAEC isolates. Specific genes may provide additional markers for the study of disease associations with age and season of sample collection.
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Affiliation(s)
- Nicoline F Tanih
- Department of Microbiology, University of Venda, Thohoyandou, South Africa
| | - David T Bolick
- Center for Global Health, University of Virginia, Charlottesville, Virginia
| | - Amidou Samie
- Department of Microbiology, University of Venda, Thohoyandou, South Africa
| | - Emanuel Nyathi
- Department of Microbiology, University of Venda, Thohoyandou, South Africa
| | - Rebecca Dillingham
- Center for Global Health, University of Virginia, Charlottesville, Virginia
| | - Relana C Pinkerton
- Center for Global Health, University of Virginia, Charlottesville, Virginia
| | - Richard L Guerrant
- Center for Global Health, University of Virginia, Charlottesville, Virginia
| | - Pascal O Bessong
- Department of Microbiology, University of Venda, Thohoyandou, South Africa
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Furlan JPR, Gallo IFL, de Campos ACLP, Navarro A, Kobayashi RKT, Nakazato G, Stehling EG. Characterization of non-O157 Shiga toxin-producing Escherichia coli (STEC) obtained from feces of sheep in Brazil. World J Microbiol Biotechnol 2019; 35:134. [PMID: 31432266 DOI: 10.1007/s11274-019-2712-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 08/08/2019] [Indexed: 02/07/2023]
Abstract
Shiga toxin-producing Escherichia coli (STEC) are zoonotic pathogens and may induce severe diarrheagenic diseases in humans and other animals. Non-O157 STEC have been emerging as important pathogens causing outbreaks worldwide. Bacterial resistance to antimicrobials has become a global public health problem, which involves different ecological spheres, including animals. This study aimed to characterize the resistance to antimicrobials, plasmids and virulence, as well as the serotypes and phylogenetic groups in E. coli isolated from sheep in Brazil. A total of 57 isolates were obtained and showed different antimicrobial resistance profiles. Nineteen isolates presented acquired antimicrobial resistance genes (ARGs) (blaCTX-M-Gp9, qnrB, qnrS, oqxB, oqxA, tetA, tetB, tetC, sul1 and sul2) and plasmid families (F, FIA, FIB, I1, K, HI1 and ColE-like). The stx1, stx2 and ehxA virulence genes were detected by PCR, being 50 isolates (87.7%) classified as STEC. A great diversity of serotypes was detected, being O176:HNM the most predominant. Phylogenetic group E was the most prevalent, followed by B1, A and B2. To the best of our knowledge, this is the first report in the world of blaCTX-M-Gp9 (O75, O114, O100, O128ac and O176 serogroups), qnrB and oqxB genes in non-O157 STEC in healthy sheep. The results obtained in the present study call attention to the monitoring of antimicrobial-resistant non-O157 STEC harboring acquired ARGs worldwide and indicate a zoonotic risk due to the profile of virulence, resistance and serotype found.
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Affiliation(s)
- João Pedro Rueda Furlan
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, Brazil
| | - Inara Fernanda Lage Gallo
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, Brazil
| | | | - Armando Navarro
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autônoma de México, Ciudad Universitaria, Mexico City, Mexico
| | | | - Gerson Nakazato
- Departamento de Microbiologia, Centro de Ciências Biológicas, Universidade Estadual de Londrina (UEL), Londrina, Brazil
| | - Eliana Guedes Stehling
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Ribeirão Preto, Brazil. .,Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo (USP), Av. do Café S/N. Monte Alegre, Ribeirão Preto, SP, 14040-903, Brazil.
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31
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Boisen N, Melton-Celsa AR, Hansen AM, Zangari T, Smith MA, Russo LM, Scheutz F, O'Brien AD, Nataro JP. The Role of the AggR Regulon in the Virulence of the Shiga Toxin-Producing Enteroaggregative Escherichia coli Epidemic O104:H4 Strain in Mice. Front Microbiol 2019; 10:1824. [PMID: 31456767 PMCID: PMC6700298 DOI: 10.3389/fmicb.2019.01824] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 07/24/2019] [Indexed: 12/04/2022] Open
Abstract
An O104:H4 Shiga toxin (Stx)-producing enteroaggregative Escherichia coli (EAEC) strain caused a large outbreak of bloody diarrhea and the hemolytic uremic syndrome in 2011. We previously developed an ampicillin (Amp)-treated C57BL/6 mouse model to measure morbidity (weight loss) and mortality of mice orally infected with the prototype Stx-EAEC strain C227-11. Here, we hypothesized that mice fed C227-11 cured of the pAA plasmid or deleted for individual genes on that plasmid would display reduced virulence compared to animals given the wild-type (wt) strain. C227-11 cured of the pAA plasmid or deleted for the known pAA-encoded virulence genes aggR, aggA, sepA, or aar were fed to Amp-treated C57BL/6 mice at doses of 1010–1011CFU. Infected animals were then either monitored for morbidity and lethality for 28 days or euthanized to determine intestinal pathology and colonization levels at selected times. The pAA-cured, aggR, and aggA mutants of strain C227-11 all showed reduced colonization at various intestinal sites. However, the aggR mutant was the only mutant attenuated for virulence as it showed both reduced morbidity and mortality. The aar mutant showed increased expression of the aggregative adherence fimbriae (AAF) and caused greater systemic effects in infected mice when compared to the C227-11 wt strain. However, unexpectedly, both the aggA and aar mutants displayed increased weight loss compared to wt. The sepA mutant did not exhibit altered morbidity or mortality in the Amp-treated mouse model compared to wt. Our data suggest that the increased morbidity due to the aar mutant could possibly be via an effect on expression of an as yet unknown virulence-associated factor under AggR control.
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Affiliation(s)
- Nadia Boisen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark.,Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Angela R Melton-Celsa
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Anne-Marie Hansen
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Tonia Zangari
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Mark A Smith
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Lisa M Russo
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Flemming Scheutz
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Alison D O'Brien
- Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - James P Nataro
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, VA, United States.,Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
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da Silva CR, Sanches MS, Macedo KH, Dambrozio AML, da Rocha SPD, Navarro A, Pelayo JS. Molecular and phenotypic characterization of diarrheagenic Escherichia coli isolated from groundwater in rural areas in southern Brazil. JOURNAL OF WATER AND HEALTH 2019; 17:597-608. [PMID: 31313997 DOI: 10.2166/wh.2019.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Water-borne diseases like diarrheagenic Escherichia coli (DEC)-induced gastroenteritis are major public health problems in developing countries. In this study, the microbiological quality of water from mines and shallow wells was analyzed for human consumption. Genotypic and phenotypic characterization of DEC strains was performed. A total of 210 water samples was analyzed, of which 153 (72.9%) contained total coliforms and 96 (45.7%) E. coli. Of the E. coli isolates, 27 (28.1%) contained DEC genes. The DEC isolates included 48.1% Shiga toxin-producing E. coli (STEC), 29.6% enteroaggregative E. coli (EAEC), 14.9% enteropathogenic E. coli (EPEC), 3.7% enterotoxigenic E. coli (ETEC), and 3.7% enteroinvasive E. coli (EIEC). All the STECs had cytotoxic effects on Vero cells and 14.8% of the DEC isolates were resistant to at least one of the antibiotics tested. All DEC formed biofilms and 92.6% adhered to HEp-2 cells with a prevalence of aggregative adhesion (74%). We identified 25 different serotypes. One EPEC isolate was serotype O44037:H7, reported for the first time in Brazil. Phylogenetically, 63% of the strains belonged to group B1. The analyzed waters were potential reservoirs for DEC and could act as a source for infection of humans. Preventive measures are needed to avoid such contamination.
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Affiliation(s)
- Caroline Rodrigues da Silva
- Departamento de Microbiologia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, Caixa Postal 10.011, CEP 86.057-970, Londrina, PR, Brazil E-mail:
| | - Matheus Silva Sanches
- Departamento de Microbiologia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, Caixa Postal 10.011, CEP 86.057-970, Londrina, PR, Brazil E-mail:
| | - Kawana Hiromori Macedo
- Departamento de Microbiologia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, Caixa Postal 10.011, CEP 86.057-970, Londrina, PR, Brazil E-mail:
| | - Angélica Marim Lopes Dambrozio
- Departamento de Microbiologia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, Caixa Postal 10.011, CEP 86.057-970, Londrina, PR, Brazil E-mail:
| | - Sergio Paulo Dejato da Rocha
- Departamento de Microbiologia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, Caixa Postal 10.011, CEP 86.057-970, Londrina, PR, Brazil E-mail:
| | - Armando Navarro
- Departamento de Salud Pública, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico
| | - Jacinta Sanchez Pelayo
- Departamento de Microbiologia, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Pr 445 Km 380, Campus Universitário, Caixa Postal 10.011, CEP 86.057-970, Londrina, PR, Brazil E-mail:
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Abstract
PURPOSE OF REVIEW The current review is to update the results on epidemiology, pathobiology, and genes related to virulence, clinical presentation, molecular diagnosis, antimicrobial resistance, and extraintestinal infection of enteroaggregative Escherichia coli (EAEC). RECENT FINDINGS EAEC subclinical infection was significantly associated with reduced length at 2 years of age and EAEC and coinfections were associated with reduced delta weight-for-length and weight-for-age z-scores in the first 6 months of age in the MAL-ED birth cohort study. EAEC was associated with malnutrition in children 6-24 months of age in prospective case-control studies in Bangladesh and Brazil. Virulence gene-based studies have suggested aggregative fimbriae II may be a major contributor to disease, whereas AggR-activated regulator a marker of less severe disease. The high ability of EAEC colonization likely exacerbates effects of other microbial virulence strategies. Molecular diagnosis has been useful for understanding EAEC burden, although different criteria may relate to different pathogenic outcomes. SUMMARY EAEC gained special interest in the past few years, especially due to association with growth decrements in children with subclinical infections and its important role as a copathogen. Understanding of EAEC pathogenesis advanced but further research is needed for elucidating both microbial and host factors influencing infection outcomes.
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Taborda RLM, Silva LAD, Orlandi PP, Batista FS, Rodrigues RS, Matos NB. CHARACTERIZATION OF ENTEROAGGREGATIVE ESCHERICHIA COLI AMONG DIARRHEAL CHILDRENIN WESTERN BRAZILIAN AMAZON. ARQUIVOS DE GASTROENTEROLOGIA 2019; 55:390-396. [PMID: 30785524 DOI: 10.1590/s0004-2803.201800000-84] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 10/12/2018] [Indexed: 12/31/2022]
Abstract
BACKGROUND Enteroaggregative Escherichia coli (EAEC) is one of the main acute and chronic diarrhea causes both in children and adults, mainly in developing countries. OBJECTIVE The aim of the present study is to characterize EAEC strains isolated from faecal samples and to identify genes potentially contributing to virulence, biofilm production and antimicrobial resistance in children admitted to a pediatric hospital in Porto Velho, Rondônia State. METHODS The total of 1,625 E. coli specimens were isolated from 591 children in the age group 6 years or younger who were hospitalized in Cosme and Damião Children Hospital in Porto Velho, between February 2010 and February 2012, with acute gastroenteritis. Colonies suggestive of E. coli were subjected to polymerase chain reaction testing in order to identify the virulence factors. The in vitro adhesion assays using HEp-2 adherence were tests. Biofilm detection through spectrophotometry and antimicrobial susceptibility tests were conducted in the disk diffusion method. RESULTS The mentioned study examined 591 stool samples from children with diarrhea. Diarrheogenic E. coli was found in 27.4% (162/591) of the children. EAEC was the diarreagenic E. coli most frequently associated with diarrhea 52.4% (85/162), which was followed by enteropathogenic E. coli 43.8% (71/162), enterotoxigenic E. coli 2.4% (4/162), and enterohemorrhagic E. coli 1.2% (2/162). The aggR gene was detected in 63.5% (54/85) of EAEC isolates; moreover, statistically significant correlation was observed among typical EAEC (aggR) and aatA (P<0.0001), irp2 (P=0.0357) and shf (P=0.0328). It was recorded that 69% (59/85) of the 85 analyzed EAEC strains were biofilm producers; 73% (43/59) of the biofilm producers carried the aggR gene versus 42.3% (11/26) of non-producers (P=0.0135). In addition, there was association between the aatA gene and biofilm production; 61% (36/59) of the samples presented producer strains, versus 19.2% (5/26) of non-producers (P<0.0004). Antibiotic sensitivity test evidenced that most EAEC were ampicillin 70.6% (60/85), sulfamethoxazole 60% (51/85), tetracycline 44.7% (38/85) and cefotaxime 22.4% (19/85) resistant. CONCLUSION As far as it is known, the present study is pioneer in Northern Brazil to investigate EAEC virulence factors and to show the antimicrobial susceptibility of EAEC strains isolated from children with diarrhea.
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Affiliation(s)
| | | | | | | | | | - Najla Benevides Matos
- Centro de Pesquisa em Medicina Tropical, Porto Velho, RO, Brasil.,Fundação Oswaldo Cruz, FIOCRUZ - Porto Velho, RO, Brasil
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35
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Lima AAM, Oliveira DB, Quetz JS, Havt A, Prata MMG, Lima IFN, Soares AM, Filho JQ, Lima NL, Medeiros PHQS, Santos AKS, Veras HN, Gondim RNDG, Pankov RC, Bona MD, Rodrigues FAP, Moreira RA, Moreira ACOM, Bertolini M, Bertolini LR, Freitas VJF, Houpt ER, Guerrant RL. Etiology and severity of diarrheal diseases in infants at the semiarid region of Brazil: A case-control study. PLoS Negl Trop Dis 2019; 13:e0007154. [PMID: 30735493 PMCID: PMC6383952 DOI: 10.1371/journal.pntd.0007154] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 02/21/2019] [Accepted: 01/13/2019] [Indexed: 12/16/2022] Open
Abstract
Background Diarrheal diseases are an important cause of morbidity and mortality among children in developing countries. We aimed to study the etiology and severity of diarrhea in children living in the low-income semiarid region of Brazil. Methodology This is a cross-sectional, age-matched case-control study of diarrhea in children aged 2–36 months from six cities in Brazil’s semiarid region. Clinical, epidemiological, and anthropometric data were matched with fecal samples collected for the identification of enteropathogens. Results We enrolled 1,200 children, 596 cases and 604 controls. By univariate analysis, eight enteropathogens were associated with diarrhea: Norovirus GII (OR 5.08, 95% CI 2.10, 12.30), Adenovirus (OR 3.79, 95% CI 1.41, 10.23), typical enteropathogenic Escherichia coli (tEPEC), (OR 3.28, 95% CI 1.39, 7.73), enterotoxigenic E. coli (ETEC LT and ST producing toxins), (OR 2.58, 95% CI 0.99, 6.69), rotavirus (OR 1.91, 95% CI 1.20, 3.02), shiga toxin-producing E. coli (STEC; OR 1.77, 95% CI 1.16, 2.69), enteroaggregative E. coli (EAEC), (OR 1.45, 95% CI 1.16, 1.83) and Giardia spp. (OR 1.39, 95% CI 1.05, 1.84). By logistic regression of all enteropathogens, the best predictors of diarrhea were norovirus, adenovirus, rotavirus, STEC, Giardia spp. and EAEC. A high diarrhea severity score was associated with EAEC. Conclusions Six enteropathogens: Norovirus, Adenovirus, Rotavirus, STEC, Giardia spp., and EAEC were associated with diarrhea in children from Brazil’s semiarid region. EAEC was associated with increased diarrhea severity. Most childhood diarrheal diseases studies focus on children from health centers or emergency hospitals that contribute to a lack of understanding of the etiology of community diarrhea. We aimed to investigate the etiology and severity of diarrheal diseases in children living in Brazil’s low-income, semiarid region communities. We used a case-control study of diarrhea (1,200 children, 596 cases and 604 controls) and showed that six enteropathogens (norovirus, adenovirus, rotavirus, STEC, Giardia and EAEC) are associated with diarrhea in these communities. Furthermore, enteroaggregative E. coli (EAEC) was associated with a high diarrhea clinical severity score. These findings help further the understanding of diarrheal disease etiology of previously unevaluated children from Brazil’s low-income semiarid region. This study contributes new information that expands our knowledge of diarrheal etiology in non-hospitalized children from developing countries. Moreover, we believe this work will support further research on specific enteropathogens, with special attention to the role of EAEC in severe cases of diarrhea and guide public health policies and physicians in the management of diarrheal diseases in Brazil’s low-income semiarid region.
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Affiliation(s)
- Aldo A. M. Lima
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
- * E-mail:
| | - Domingos B. Oliveira
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Josiane S. Quetz
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Alexandre Havt
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Mara M. G. Prata
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Ila F. N. Lima
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Alberto M. Soares
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - José Q. Filho
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Noélia L. Lima
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Pedro H. Q. S. Medeiros
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Ana K. S. Santos
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Herlice N. Veras
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Rafhaella N. D. G. Gondim
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Rafaela C. Pankov
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Mariana D. Bona
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Francisco A. P. Rodrigues
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | | | | | | | | | | | - Eric R. Houpt
- Center for Global Health and Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, United States of America
| | - Richard L. Guerrant
- INCT-Biomedicine and Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
- Center for Global Health and Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, United States of America
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Virulence-Related Genes and Coenteropathogens Associated with Clinical Outcomes of Enteropathogenic Escherichia coli Infections in Children from the Brazilian Semiarid Region: a Case-Control Study of Diarrhea. J Clin Microbiol 2019; 57:JCM.01777-18. [PMID: 30728193 DOI: 10.1128/jcm.01777-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 01/26/2019] [Indexed: 12/26/2022] Open
Abstract
Enteropathogenic Escherichia coli (EPEC) is a major cause of diarrhea in children from developing countries and presents high genetic variability. We aimed to characterize the EPEC virulence-related gene (VRG) distribution and copathogens associated with diarrhea and nutrition-related outcomes in children from the low-income Brazilian semiarid region. A cross-sectional case-control study of diarrhea was conducted in 1,191 children aged 2 to 36 months from the northeast region of Brazil. Stool samples were collected and clinical, epidemiological, and anthropometric data were identified from each child. A broad molecular evaluation of enteropathogens was performed, and EPEC-positive samples were further investigated for 18 VRGs using five multiplex PCRs. EPEC was detected in 28.2% of the study population, with similar proportions among cases and controls. Typical EPEC (tEPEC) infections were more often associated with diarrhea than atypical EPEC (aEPEC) infections, while aEPEC infections presented a higher prevalence. The VRG ler, a negative regulator of the locus of enterocyte effacement, was associated with the absence of diarrhea in aEPEC-positive children; espB, a major component of the type 3 secretion system, was associated with diarrhea in tEPEC-positive children; the presence of procolonization VRGs-the combination of cesT positivity, espP negativity, and the presence of the map gene-was associated with undernutrition; and Campylobacter spp., norovirus, and enteroaggregative E. coli (EAEC) coinfections were associated with increased clinical severity in EPEC-infected children. These data identified tEPEC strains associated with diarrhea and specific VRGs of EPEC (ler, espB, cesT, and map genes) and Campylobacter spp., norovirus, and EAEC to be major contributors to diarrhea and undernutrition in children from a low-income Brazilian region.
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Alanyl-glutamine Protects Against Damage Induced by Enteroaggregative Escherichia coli Strains in Intestinal Cells. J Pediatr Gastroenterol Nutr 2019; 68:190-198. [PMID: 30247422 DOI: 10.1097/mpg.0000000000002152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
BACKGROUND Enteroaggregative Escherichia coli (EAEC) is an important pathogen causing enteric infections worldwide. This pathotype is linked to malnutrition in children from developing countries. Alanyl-glutamine (Ala-Gln) is an immune modulator nutrient that acts during intestinal damage and/or inflammation. This study investigated the effect of EAEC infection and Ala-Gln on cell viability, cell death, and inflammation of intestinal epithelium cells (IEC-6). METHODS Cells were infected with an EAEC prototype 042 strain, an EAEC wild-type strain isolated from a Brazilian malnourished child, and a commensal E coli HS. Gene transcription and protein levels of caspases-3, -8, and -9 and cytokine-induced neutrophil chemoattractant 1 (CINC-1/CXCL1) were evaluated using RT-qPCR, western blot analysis, and ELISA. RESULTS Infections with both EAEC strains decreased cell viability and induced apoptosis and necrosis after 24 hours. Ala-Gln supplementation increased cell proliferation and reduced cell death in infected cells. Likewise, EAEC strain 042 significantly increased the transcript levels of caspases-3, -8, and -9 when compared to the control group, and Ala-Gln treatment reversed this effect. Furthermore, EAEC induced CXCL1 protein levels, which were also reduced by Ala-Gln supplementation. CONCLUSION These findings suggest that EAEC infection promotes apoptosis, necrosis, and intestinal inflammation with involvement of caspases. Supplementation of Ala-Gln inhibits cell death, increases cell proliferation, attenuates mediators associated with cell death, and inflammatory pathways in infected cells.
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Lang C, Fruth A, Holland G, Laue M, Mühlen S, Dersch P, Flieger A. Novel type of pilus associated with a Shiga-toxigenic E. coli hybrid pathovar conveys aggregative adherence and bacterial virulence. Emerg Microbes Infect 2018; 7:203. [PMID: 30514915 PMCID: PMC6279748 DOI: 10.1038/s41426-018-0209-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 11/09/2018] [Accepted: 11/11/2018] [Indexed: 01/31/2023]
Abstract
A large German outbreak in 2011 was caused by a locus of enterocyte effacement (LEE)-negative enterohemorrhagic E. coli (EHEC) strain of the serotype O104:H4. This strain harbors markers that are characteristic of both EHEC and enteroaggregative E. coli (EAEC), including aggregative adhesion fimbriae (AAF) genes. Such rare EHEC/EAEC hybrids are highly pathogenic due to their possession of a combination of genes promoting severe toxicity and aggregative adhesion. We previously identified novel EHEC/EAEC hybrids and observed that one strain exhibited aggregative adherence but had no AAF genes. In this study, a genome sequence analysis showed that this strain belongs to the genoserotype O23:H8, MLST ST26, and harbors a 5.2 Mb chromosome and three plasmids. One plasmid carries some EAEC marker genes, such as aatA and genes with limited protein homology (11–61%) to those encoding the bundle-forming pilus (BFP) of enteropathogenic E. coli. Due to significant protein homology distance to known pili, we designated these as aggregate-forming pili (AFP)-encoding genes and the respective plasmid as pAFP. The afp operon was arranged similarly to the operon of BFP genes but contained an additional gene, afpA2, which is homologous to afpA. The deletion of the afp operon, afpA, or a nearby gene (afpR) encoding an AraC-like regulator, but not afpA2, led to a loss of pilin production, piliation, bacterial autoaggregation, and importantly, a >80% reduction in adhesion and cytotoxicity toward epithelial cells. Gene sets similar to the afp operon were identified in a variety of aatA-positive but AAF-negative intestinal pathogenic E. coli. In summary, we characterized widely distributed and novel fimbriae that are essential for aggregative adherence and cytotoxicity in a LEE-negative Shiga-toxigenic hybrid.
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Affiliation(s)
- Christina Lang
- Division of Enteropathogenic Bacteria and Legionella, Robert Koch Institut, Wernigerode, Saxony-Anhalt, 38855, Germany
| | - Angelika Fruth
- Division of Enteropathogenic Bacteria and Legionella, Robert Koch Institut, Wernigerode, Saxony-Anhalt, 38855, Germany
| | - Gudrun Holland
- Division of Advanced Light and Electron Microscopy, Robert Koch Institut, Berlin, 13353, Germany
| | - Michael Laue
- Division of Advanced Light and Electron Microscopy, Robert Koch Institut, Berlin, 13353, Germany
| | - Sabrina Mühlen
- Department of Molecular Infection Biology, Helmholtz Centre for Infection Research, Braunschweig, Lower Saxony, 38124, Germany
| | - Petra Dersch
- Department of Molecular Infection Biology, Helmholtz Centre for Infection Research, Braunschweig, Lower Saxony, 38124, Germany
| | - Antje Flieger
- Division of Enteropathogenic Bacteria and Legionella, Robert Koch Institut, Wernigerode, Saxony-Anhalt, 38855, Germany.
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Temporal Variability of Escherichia coli Diversity in the Gastrointestinal Tracts of Tanzanian Children with and without Exposure to Antibiotics. mSphere 2018; 3:3/6/e00558-18. [PMID: 30404930 PMCID: PMC6222053 DOI: 10.1128/msphere.00558-18] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
This study increases the number of resident Escherichia coli genome sequences, and explores E. coli diversity through longitudinal sampling. We investigate the genomes of E. coli isolated from human gastrointestinal tracts as part of an antibiotic treatment program among rural Tanzanian children. Phylogenomics demonstrates that resident E. coli are diverse, even within a single host. Though the E. coli isolates of the gastrointestinal community tend to be phylogenomically similar at a given time, they differed across the interrogated time points, demonstrating the variability of the members of the E. coli community in these subjects. Exposure to antibiotic treatment did not have an apparent impact on the E. coli community or the presence of resistance and virulence genes within E. coli genomes. The findings of this study highlight the variable nature of specific bacterial members of the human gastrointestinal tract. The stability of the Escherichia coli populations in the human gastrointestinal tract is not fully appreciated, and represents a significant knowledge gap regarding gastrointestinal community structure, as well as resistance to incoming pathogenic bacterial species and antibiotic treatment. The current study examines the genomic content of 240 Escherichia coli isolates from 30 children, aged 2 to 35 months old, in Tanzania. The E. coli strains were isolated from three time points spanning a six-month time period, with and without antibiotic treatment. The resulting isolates were sequenced, and the genomes compared. The findings in this study highlight the transient nature of E. coli strains in the gastrointestinal tract of these children, as during a six-month interval, no one individual contained phylogenomically related isolates at all three time points. While the majority of the isolates at any one time point were phylogenomically similar, most individuals did not contain phylogenomically similar isolates at more than two time points. Examination of global genome content, canonical E. coli virulence factors, multilocus sequence type, serotype, and antimicrobial resistance genes identified diversity even among phylogenomically similar strains. There was no apparent increase in the antimicrobial resistance gene content after antibiotic treatment. The examination of the E. coli from longitudinal samples from multiple children in Tanzania provides insight into the genomic diversity and population variability of resident E. coli within the rapidly changing environment of the gastrointestinal tract of these children. IMPORTANCE This study increases the number of resident Escherichia coli genome sequences, and explores E. coli diversity through longitudinal sampling. We investigate the genomes of E. coli isolated from human gastrointestinal tracts as part of an antibiotic treatment program among rural Tanzanian children. Phylogenomics demonstrates that resident E. coli are diverse, even within a single host. Though the E. coli isolates of the gastrointestinal community tend to be phylogenomically similar at a given time, they differed across the interrogated time points, demonstrating the variability of the members of the E. coli community in these subjects. Exposure to antibiotic treatment did not have an apparent impact on the E. coli community or the presence of resistance and virulence genes within E. coli genomes. The findings of this study highlight the variable nature of specific bacterial members of the human gastrointestinal tract.
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Distribution of genes encoding virulence factors and multilocus variable-number tandem-repeat analysis (MLVA) of entero-aggregative Escherichia coli (EAEC) isolated in Iran from patients with diarrhoea. J Med Microbiol 2018; 67:1334-1339. [DOI: 10.1099/jmm.0.000786] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Li D, Shen M, Xu Y, Liu C, Wang W, Wu J, Luo X, Jia X, Ma Y. Virulence gene profiles and molecular genetic characteristics of diarrheagenic Escherichia coli from a hospital in western China. Gut Pathog 2018; 10:35. [PMID: 30127859 PMCID: PMC6097206 DOI: 10.1186/s13099-018-0262-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 08/09/2018] [Indexed: 02/05/2023] Open
Abstract
Background Diarrheagenic Escherichia coli (DEC) is one of the most important etiological agents of diarrheal diseases. In this study we investigated the prevalence, virulence gene profiles, antimicrobial resistance, and molecular genetic characteristics of DEC at a hospital in western China. Methods A total of 110 Escherichia coli clinical isolates were collected from the First Affiliated Hospital of Chengdu Medical College from 2015 to 2016. Microbiological methods, PCR, antimicrobial susceptibility test, pulsed-field gel electrophoresis and multilocus sequence typing were used in this study. Results Molecular analysis of six DEC pathotype marker genes showed that 13 of the 110 E. coli isolates (11.82%) were DEC including nine (8.18%) diffusely adherent Escherichia coli (DAEC) and four (3.64%) enteroaggregative Escherichia coli (EAEC). The adherence genes fimC and fimH were present in all DAEC and EAEC isolates. All nine DAEC isolates harbored the virulence genes fyuA and irp2 and four (44.44%) also carried the hlyA and sat genes. The virulence genes fyuA, irp2, cnf1, hlyA, and sat were found in 100%, 100%, 75%, 50%, and 50% of EAEC isolates, respectively. In addition, all DEC isolates were multidrug resistant and had high frequencies of antimicrobial resistance. Molecular genetic characterization showed that the 13 DEC isolates were divided into 11 pulsed-field gel electrophoresis patterns and 10 sequence types. Conclusions To the best of our knowledge, this study provides the first report of DEC, including DAEC and EAEC, in western China. Our analyses identified the virulence genes present in E. coli from a hospital indicating their role in the isolated DEC strains’ pathogenesis. At the same time, the analyses revealed, the antimicrobial resistance pattern of the DEC isolates. Thus, DAEC and EAEC among the DEC strains should be considered a significant risk to humans in western China due to their evolved pathogenicity and antimicrobial resistance pattern.
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Affiliation(s)
- Dan Li
- 1Department of Medical Genetics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041 Sichuan China.,2School of Medical Laboratory Science, Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Min Shen
- 3Non-coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Ying Xu
- 4Clinical Laboratory, The First Affiliated Hospital of Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Chao Liu
- 3Non-coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Wen Wang
- 5West China School of Public Health, Sichuan University, Chengdu, 610041 Sichuan China
| | - Jinyan Wu
- 3Non-coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Xianmei Luo
- 3Non-coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Xu Jia
- 3Non-coding RNA and Drug Discovery Key Laboratory of Sichuan Province, Chengdu Medical College, Chengdu, 610500 Sichuan China
| | - Yongxin Ma
- 1Department of Medical Genetics, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041 Sichuan China
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Amin M, Sirous M, Javaherizadeh H, Motamedifar M, Saki M, Veisi H, Ebrahimi S, Seyed-Mohammadi S, Hashemzadeh M. Antibiotic resistance pattern and molecular characterization of extended-spectrum β-lactamase producing enteroaggregative Escherichia coli isolates in children from southwest Iran. Infect Drug Resist 2018; 11:1097-1104. [PMID: 30127627 PMCID: PMC6089113 DOI: 10.2147/idr.s167271] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Introduction Enteroaggregative Escherichia coli (EAEC) has been implicated as an emerging cause of traveler’s diarrhea, persistent diarrhea among children, and immunocompromised patients. The present study aimed to investigate the prevalence of antibiotic resistance, extendedspectrum β-lactamase (ESBL) production, and virulence factors of EAEC isolates obtained from Iranian children suffered from diarrhea. Materials and methods In this cross-sectional study, from March 2015 to February 2016, 32 EAEC isolates were collected from fecal samples of children aged <12 years with diarrhea in southwest of Iran. All EAEC isolates identified using phenotypic and molecular methods and the cell line adhesion assay. Antimicrobial susceptibility testing was determined using disk diffusion method. The presence of virulence factors and ESBL resistance genes were determined by polymerase chain reaction. Results Overall, 28.1% (9/32) of the isolates were positive for at least one of virulence genes. The most frequent gene was aap with a frequency of 96.9%. Neither aafA nor aggA gene was detected among all of the EAEC isolates. Antimicrobial susceptibility testing revealed the highest resistance rate to ampicillin (100%) and co-trimoxazole (100%), followed by ceftriaxone (81.3%). Further analysis revealed that the rate of ESBLs-producing isolates was 71.9% (23/32). Polymerase chain reaction screening revealed that 87.5% and 65.5% of EAEC isolates were positive for blaTEM and blaCTX-M genes, respectively, and 17 (53.1%) of isolates contained both blaTEM and blaCTX-M genes. Conclusion The high detection rate of ESBL-producing EAEC isolates accompanied with virulence genes highlights a need to restrict infection control policies in order to prevent further dissemination of the resistant and virulent EAEC strains.
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Affiliation(s)
- Mansour Amin
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Microbiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,
| | - Mehrandokht Sirous
- Department of Microbiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,
| | - Hazhir Javaherizadeh
- Abuzar Children's Hospital, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Alimentary Tract Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Nursing Care Research Center in Chronic Diseases, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mohammad Motamedifar
- Department of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.,Shiraz HIV/AIDS Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Morteza Saki
- Department of Microbiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran, .,Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,
| | - Hojat Veisi
- Department of Microbiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,
| | - Saeedeh Ebrahimi
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Virology, Faculty of Mdicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Sakineh Seyed-Mohammadi
- Department of Microbiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran, .,Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,
| | - Mohammad Hashemzadeh
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Microbiology, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran,
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Affiliation(s)
- Bente Olesen
- Department of Clinical Microbiology, Herlev and Gentofte Hospital, University of Copenhagen, Denmark
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Medeiros PHQS, Lima AÂM, Guedes MM, Havt A, Bona MD, Rey LC, Soares AM, Guerrant RL, Weigl BH, Lima IFN. Molecular characterization of virulence and antimicrobial resistance profile of Shigella species isolated from children with moderate to severe diarrhea in northeastern Brazil. Diagn Microbiol Infect Dis 2017; 90:198-205. [PMID: 29217418 DOI: 10.1016/j.diagmicrobio.2017.11.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 10/08/2017] [Accepted: 11/01/2017] [Indexed: 12/28/2022]
Abstract
Molecular characterization of virulence and antimicrobial resistance profiles were determined for Shigella species isolated from children with diarrhea in Fortaleza, Brazil. Fecal specimens were collected along with socioeconomic and clinical data from children with moderate to severe diarrhea requiring emergency care. Shigella spp. were isolated by standard microbiological techniques, and we developed 4 multiplex polymerase chain reaction assays to detect 16 virulence-related genes (VRGs). Antimicrobial susceptibility tests were performed using disk diffusion assays. S. flexneri and S. sonnei were the predominant serogroups. S. flexneri was associated with low monthly incomes; more severe disease; higher number of VRGs; and presence of pic, set, and sepA genes. The SepA gene was associated with more intense abdominal pain. S. flexneri was correlated with resistance to ampicillin and chloramphenicol, whereas S. sonnei was associated with resistance to azithromycin. Strains harboring higher numbers of VRGs were associated with resistance to more antimicrobials. We highlight the correlation between presence of S. flexneri and sepA, and increased virulence and suggest a link to socioeconomic change in northeastern Brazil. Additionally, antimicrobial resistance was associated with serogroup specificity in Shigella spp. and increased bacterial VRGs.
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Affiliation(s)
| | - Aldo Ângelo Moreira Lima
- Institute of Biomedicine for Brazilian Semi-Arid (IBISAB), Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, CE, Brazil; Center for Global Health, Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, USA
| | - Marjorie Moreira Guedes
- Institute of Biomedicine for Brazilian Semi-Arid (IBISAB), Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Alexandre Havt
- Institute of Biomedicine for Brazilian Semi-Arid (IBISAB), Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Mariana Duarte Bona
- Institute of Biomedicine for Brazilian Semi-Arid (IBISAB), Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Luís Carlos Rey
- Department of Mother and Child Health, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Alberto Melo Soares
- Institute of Biomedicine for Brazilian Semi-Arid (IBISAB), Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Richard Littleton Guerrant
- Center for Global Health, Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, USA
| | - Bernhard H Weigl
- Program for Appropriate Technology in Health (PATH), Seattle, WA, USA
| | - Ila Fernanda Nunes Lima
- Institute of Biomedicine for Brazilian Semi-Arid (IBISAB), Department of Physiology and Pharmacology, Federal University of Ceara, Fortaleza, CE, Brazil
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Jønsson R, Struve C, Jenssen H, Krogfelt KA. The wax moth Galleria mellonella as a novel model system to study Enteroaggregative Escherichia coli pathogenesis. Virulence 2017; 8:1894-1899. [PMID: 27824518 PMCID: PMC5810504 DOI: 10.1080/21505594.2016.1256537] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Rie Jønsson
- a Department of Science and Environment , Roskilde University , Roskilde , Denmark.,b Department of Microbiology and Infection Control , Statens Serum Institut , Copenhagen , Denmark
| | - Carsten Struve
- b Department of Microbiology and Infection Control , Statens Serum Institut , Copenhagen , Denmark
| | - Håvard Jenssen
- a Department of Science and Environment , Roskilde University , Roskilde , Denmark
| | - Karen A Krogfelt
- b Department of Microbiology and Infection Control , Statens Serum Institut , Copenhagen , Denmark
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Chattaway MA, Day M, Mtwale J, White E, Rogers J, Day M, Powell D, Ahmad M, Harris R, Talukder KA, Wain J, Jenkins C, Cravioto A. Clonality, virulence and antimicrobial resistance of enteroaggregative Escherichia coli from Mirzapur, Bangladesh. J Med Microbiol 2017; 66:1429-1435. [PMID: 28945190 PMCID: PMC5845566 DOI: 10.1099/jmm.0.000594] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Purpose This study investigates the virulence and antimicrobial resistance in association with common clonal complexes (CCs) of enteroaggregative Escherichia coli (EAEC) isolated from Bangladesh. The aim was to determine whether specific CCs were more likely to be associated with putative virulence genes and/or antimicrobial resistance. Methodology The presence of 15 virulence genes (by PCR) and susceptibility to 18 antibiotics were determined for 151 EAEC isolated from cases and controls during an intestinal infectious disease study carried out between 2007–2011 in the rural setting of Mirzapur, Bangladesh (Kotloff KL, Blackwelder WC, Nasrin D, Nataro JP, Farag TH et al.Clin Infect Dis 2012;55:S232–S245). These data were then analysed in the context of previously determined serotypes and clonal complexes defined by multi-locus sequence typing. Results Overall there was no association between the presence of virulence or antimicrobial resistance genes in isolates of EAEC from cases versus controls. However, when stratified by clonal complex (CC) one CC associated with cases harboured more virulence factors (CC40) and one CC harboured more resistance genes (CC38) than the average. There was no direct link between the virulence gene content and antibiotic resistance. Strains within a single CC had variable virulence and resistance gene content indicating independent and multiple gene acquisitions over time. Conclusion In Bangladesh, there are multiple clonal complexes of EAEC harbouring a variety of virulence and resistance genes. The emergence of two of the most successful clones appeared to be linked to either increased virulence (CC40) or antimicrobial resistance (CC38), but increased resistance and virulence were not found in the same clonal complexes.
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Affiliation(s)
| | - Michaela Day
- Antimicrobial Resistance and Healthcare Associated Infections, Public Health England, London, UK
| | - Julia Mtwale
- Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK.,Centre for Clinical Microbiology, Division of Infection and Immunity, University of College London, London, UK
| | - Emma White
- Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK.,Department of Medical Microbiology, Royal Free London NHS Foundation Trust, London, UK
| | - James Rogers
- Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK
| | - Martin Day
- Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK
| | - David Powell
- Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK
| | - Marwa Ahmad
- Department of Microbiology and Infection Control, Technical University of Denmark, Denmark
| | - Ross Harris
- Statistics, Modelling and Economics Department, Public Health England, London, UK
| | - Kaisar Ali Talukder
- Centre for Food and Water Borne Diseases, International Centre for Diarrhoeal Disease Research, Bangladesh
| | - John Wain
- Norwich Medical School, University of East Anglia, Norwich, UK
| | - Claire Jenkins
- Gastrointestinal Bacteria Reference Unit, Public Health England, London, UK
| | - Alejandro Cravioto
- Centre for Food and Water Borne Diseases, International Centre for Diarrhoeal Disease Research, Bangladesh
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Santiago AE, Yan MB, Hazen TH, Sauder B, Meza-Segura M, Rasko DA, Kendall MM, Ruiz-Perez F, Nataro JP. The AraC Negative Regulator family modulates the activity of histone-like proteins in pathogenic bacteria. PLoS Pathog 2017; 13:e1006545. [PMID: 28806780 PMCID: PMC5570504 DOI: 10.1371/journal.ppat.1006545] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 08/24/2017] [Accepted: 07/20/2017] [Indexed: 02/04/2023] Open
Abstract
The AraC Negative Regulators (ANR) comprise a large family of virulence regulators distributed among diverse clinically important Gram-negative pathogens, including Vibrio spp., Salmonella spp., Shigella spp., Yersinia spp., Citrobacter spp., and pathogenic E. coli strains. We have previously reported broad effects of the ANR members on regulators of the AraC/XylS family. Here, we interrogate possible broader effects of the ANR members on the bacterial transcriptome. Our studies focused on Aar (AggR-activated regulator), an ANR family archetype in enteroaggregative E. coli (EAEC) isolate 042. Transcriptome analysis of EAEC strain 042, 042aar and 042aar(pAar) identified more than 200 genes that were differentially expressed (+/- 1.5 fold, p<0.05). Most of those genes are located on the bacterial chromosome (195 genes, 92.85%), and are associated with regulation, transport, metabolism, and pathogenesis, based on the predicted annotation; a considerable number of Aar-regulated genes encoded for hypothetical proteins (46 genes, 21.9%) and regulatory proteins (25, 11.9%). Notably, the transcriptional expression of three histone-like regulators, H-NS (orf1292), H-NS homolog (orf2834) and StpA, was down-regulated in the absence of aar and may explain some of the effects of Aar on gene expression. By employing a bacterial two-hybrid system, LacZ reporter assays, pull-down and electrophoretic mobility shift assay (EMSA) analysis, we demonstrated that Aar binds directly to H-NS and modulates H-NS-induced gene silencing. Importantly, Aar was highly expressed in the mouse intestinal tract and was found to be necessary for maximal H-NS expression. In conclusion, this work further extends our knowledge of genes under the control of Aar and its biological relevance in vivo. The AraC Negative Regulators (ANR) is a large family of negative regulators distributed in several clinically relevant Gram-negative pathogens, including Vibrio spp., Salmonella spp., Shigella spp., Yersinia spp., Citrobacter spp., pathogenic E. coli, and members of the Pasteurellaceae. Previously, we showed that the ANR family suppresses transcriptional expression of virulence factors such as fimbriae, toxins, and the type VI secretion system by directly down-regulating AraC/XylS master regulators. Transcriptome and biochemical analysis of Aar (AggR-activated regulator), an ANR family archetype in enteroaggregative E. coli (EAEC) 042, demonstrated that Aar binds directly to H-NS and modulates the H-NS-induced gene expression. Accordingly, mutation of aar decreased expression of the H-NS-regulated Lpf fimbriae, LPS-related enzymes, GadXW operon and porins. Importantly, Aar was highly expressed in the mouse intestinal tract and was found to be necessary for maximal H-NS expression. These findings unveil an exquisite regulatory network in pathogenic bacteria, which operates by concomitant control of master transcriptional regulators of the AraC family and global negative H-NS regulators.
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Affiliation(s)
- Araceli E. Santiago
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
- * E-mail:
| | - Michael B. Yan
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
| | - Tracy H. Hazen
- Institute for Genome Sciences, Department of Microbiology and Immunology. University of Maryland, Baltimore, Maryland, United States of America
| | - Brooke Sauder
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, Virginia, United States of America
| | - Mario Meza-Segura
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
| | - David A. Rasko
- Institute for Genome Sciences, Department of Microbiology and Immunology. University of Maryland, Baltimore, Maryland, United States of America
| | - Melissa M. Kendall
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, Virginia, United States of America
| | - Fernando Ruiz-Perez
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
| | - James P. Nataro
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
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Havt A, Lima IF, Medeiros PH, Clementino MA, Santos AK, Amaral MS, Veras HN, Prata MM, Lima NL, Di Moura A, Leite ÁM, Soares AM, Filho JQ, Houpt ER, Nataro JP, Guerrant RL, Lima AA. Prevalence and virulence gene profiling of enteroaggregative Escherichia coli in malnourished and nourished Brazilian children. Diagn Microbiol Infect Dis 2017; 89:98-105. [PMID: 28780245 PMCID: PMC5608016 DOI: 10.1016/j.diagmicrobio.2017.06.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 06/21/2017] [Accepted: 06/28/2017] [Indexed: 01/07/2023]
Abstract
The impact of enteroaggregative E. coli (EAEC) infection on childhood malnutrition and inflammation has been suggested, regardless of diarrhea. We investigated whether EAEC and its virulence-related genes (VRGs) are associated with malnutrition in a case-control study. Children aged 6-24 months from Brazil were enrolled as malnourished if weight-for-age Z-score (WAZ) ≤ -2 and nourished if WAZ > -1. Stools were cultured and examined for E. coli. DNA was extracted from fecal isolates and tested for EAEC by polymerase chain reaction (PCR). Positive samples were analyzed by 5 multiplex PCRs to identify 20 EAEC VRGs. Biomarkers of intestinal barrier function and inflammation were measured. The prevalence of EAEC was 39.94%. Samples that presented both aaiC and aatA genes were associated with malnutrition (P = 0.045). A high prevalence of VRGs was observed and the aafC gene was significantly associated with malnourished (P = 0.0101). Strains lacking aar and pic genes were associated with malnutrition (P = 0.018), while the concomitant presence of aar, pic, agg4A, and capU genes was associated with nourished (P = 0.031). These data reinforce the EAEC impact on malnutrition, the importance of aar as negative regulator and the great contribution of AAF/II fimbria for the pathobiology of EAEC.
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Affiliation(s)
- Alexandre Havt
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil.
| | - Ila Fn Lima
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Pedro Hqs Medeiros
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Marco Af Clementino
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Ana Ks Santos
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Marília Smg Amaral
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Herlice N Veras
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Mara Mg Prata
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Noélia L Lima
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Alessandra Di Moura
- Institute for the Promotion of Nutrition and Human Development, 15 Professor Carlos Lobo, 60281-740, Fortaleza, Ceará, Brazil
| | - Álvaro M Leite
- Institute for the Promotion of Nutrition and Human Development, 15 Professor Carlos Lobo, 60281-740, Fortaleza, Ceará, Brazil
| | - Alberto M Soares
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - José Q Filho
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil
| | - Eric R Houpt
- Center for Global Health & Division of Infectious Diseases and International Health and Department of Pediatrics, University of Virginia, 1400 W Main Street, 22908-1379, Charlottesville, VA, USA
| | - James P Nataro
- Center for Global Health & Division of Infectious Diseases and International Health and Department of Pediatrics, University of Virginia, 1400 W Main Street, 22908-1379, Charlottesville, VA, USA
| | - Richard L Guerrant
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil; Center for Global Health & Division of Infectious Diseases and International Health and Department of Pediatrics, University of Virginia, 1400 W Main Street, 22908-1379, Charlottesville, VA, USA
| | - Aldo Am Lima
- Institute of Biomedicine for Brazilian Semiarid, Federal University of Ceará, 1315 Coronel Nunes de Melo, 60430-270, Fortaleza, Brazil; Center for Global Health & Division of Infectious Diseases and International Health and Department of Pediatrics, University of Virginia, 1400 W Main Street, 22908-1379, Charlottesville, VA, USA
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Enteroaggregative Escherichia coli Adherence Fimbriae Drive Inflammatory Cell Recruitment via Interactions with Epithelial MUC1. mBio 2017; 8:mBio.00717-17. [PMID: 28588132 PMCID: PMC5461410 DOI: 10.1128/mbio.00717-17] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Enteroaggregative Escherichia coli (EAEC) causes diarrhea and intestinal inflammation worldwide. EAEC strains are characterized by the presence of aggregative adherence fimbriae (AAF), which play a key role in pathogenesis by mediating attachment to the intestinal mucosa and by triggering host inflammatory responses. Here, we identify the epithelial transmembrane mucin MUC1 as an intestinal host cell receptor for EAEC, demonstrating that AAF-mediated interactions between EAEC and MUC1 facilitate enhanced bacterial adhesion. We further demonstrate that EAEC infection also causes elevated expression of MUC1 in inflamed human intestinal tissues. Moreover, we find that MUC1 facilitates AAF-dependent migration of neutrophils across the epithelium in response to EAEC infection. Thus, we show for the first time a proinflammatory role for MUC1 in the host response to an intestinal pathogen. EAEC is a clinically important intestinal pathogen that triggers intestinal inflammation and diarrheal illness via mechanisms that are not yet fully understood. Our findings provide new insight into how EAEC triggers host inflammation and underscores the pivotal role of AAFs—the principal adhesins of EAEC—in driving EAEC-associated disease. Most importantly, our findings add a new dimension to the signaling properties of the transmembrane mucin MUC1. Mostly studied for its role in various forms of cancer, MUC1 is widely regarded as playing an anti-inflammatory role in response to infection with bacterial pathogens in various tissues. However, the role of MUC1 during intestinal infections has not been previously explored, and our results describe the first report of MUC1 as a proinflammatory factor following intestinal infection.
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50
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Andrade FB, Abreu AG, Nunes KO, Gomes TA, Piazza RM, Elias WP. Distribution of serine protease autotransporters of Enterobacteriaceae in typical and atypical enteroaggregative Escherichia coli. INFECTION GENETICS AND EVOLUTION 2017; 50:83-86. [DOI: 10.1016/j.meegid.2017.02.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 02/23/2017] [Accepted: 02/25/2017] [Indexed: 10/20/2022]
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