Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 56
Filtrar
1.
Infect Genet Evol ; : 105598, 2024 Apr 21.
Artigo em Inglês | MEDLINE | ID: mdl-38653335

RESUMO

Klebsiella pneumoniae is an opportunistic pathogen that can colonize the gastrointestinal tract (GIT) of humans. The mechanisms underlying the successful translocation of this pathogen to cause extra-intestinal infections remain unknown, although virulence and antimicrobial resistance traits likely play significant roles in the establishment of infections. We investigated K. pneumoniae strains isolated from GIT colonization (strains Kp_FZcol-1, Kp_FZcol-2 and Kp_FZcro-1) and from a fatal bloodstream infection (strain Kp_HM-1) in a leukemia patient. All strains belonged to ST307, carried a transferable IncF plasmid containing the blaCTX-M-15 gene (pKPN3-307 TypeA-like plasmid) and showed a multidrug-resistance phenotype. Phylogenetic analysis demonstrated that Kp_HM-1 was more closely related to Kp_FZcro-1 than to the other colonizing strains. The Kp_FZcol-2 genome showed an 81 % coverage with the Kp_HM-1 246,730 bp plasmid (pKp_HM-1), lacking most of the plasmid's putative virulence genes. Searching public genomes with similar coverage, we observed the occurrence of this deletion in K. pneumoniae ST307 strains recovered from human colonization and infection in different countries. Our findings suggest that strains lacking the putative virulence genes found in the pKPN3-307 TypeA plasmid are still able to colonize and infect humans, highlighting the need to further investigate the role of these genes for the adaptation of K. pneumoniae ST307 in distinct human body sites.

2.
Sci Rep ; 13(1): 6238, 2023 04 17.
Artigo em Inglês | MEDLINE | ID: mdl-37069157

RESUMO

Polymyxin-carbapenem-resistant Klebsiella pneumoniae (PCR-Kp) with pan (PDR)- or extensively drug-resistant phenotypes has been increasingly described worldwide. Here, we report a PCR-Kp outbreak causing untreatable infections descriptively correlated with bacterial genomes. Hospital-wide surveillance of PCR-Kp was initiated in December-2014, after the first detection of a K. pneumoniae phenotype initially classified as PDR, recovered from close spatiotemporal cases of a sentinel hospital in Rio de Janeiro. Whole-genome sequencing of clinical PCR-Kp was performed to investigate similarities and dissimilarities in phylogeny, resistance and virulence genes, plasmid structures and genetic polymorphisms. A target phenotypic profile was detected in 10% (12/117) of the tested K. pneumoniae complex bacteria recovered from patients (8.5%, 8/94) who had epidemiological links and were involved in intractable infections and death, with combined therapeutic drugs failing to meet synergy. Two resistant bacterial clades belong to the same transmission cluster (ST437) or might have different sources (ST11). The severity of infection was likely related to patients' comorbidities, lack of antimicrobial therapy and predicted bacterial genes related to high resistance, survival, and proliferation. This report contributes to the actual knowledge about the natural history of PCR-Kp infection, while reporting from a time when there were no licensed drugs in the world to treat some of these infections. More studies comparing clinical findings with bacterial genetic markers during clonal spread are needed.


Assuntos
Infecções por Klebsiella , Polimixinas , Humanos , Polimixinas/farmacologia , Polimixinas/uso terapêutico , Klebsiella pneumoniae , Infecções por Klebsiella/tratamento farmacológico , Infecções por Klebsiella/epidemiologia , Infecções por Klebsiella/genética , Brasil , Genoma Bacteriano , Surtos de Doenças , Carbapenêmicos/uso terapêutico , Antibacterianos/farmacologia , Antibacterianos/uso terapêutico , Testes de Sensibilidade Microbiana , beta-Lactamases/genética , Proteínas de Bactérias/genética
3.
Sci Rep ; 12(1): 19050, 2022 11 09.
Artigo em Inglês | MEDLINE | ID: mdl-36351942

RESUMO

Antibiotic resistance genes (ARGs) are widespread in the environment due to the overuse of antibiotics and other pollutants, posing a threat to human and animal health. In this study, we evaluated antimicrobial residues, bacterial diversity and ARGs in two important watersheds, Guandu and São João, that supply drinking water to Rio de Janeiro city, Brazil. In addition, tap water samples were collected from three different cities in Rio de Janeiro State, including the metropolitan area of Rio de Janeiro city. Clarithromycin, sulfamethoxazole and azithromycin were found in untreated water and drinking water in all samples. A greater abundance of Proteobacteria was observed in Guandu and São João watersheds, with most of the sequences belonging to the Gammaproteobacteria class. A plasmidome-focused metagenomics approach revealed 4881 (Guandu), 3705 (São João) and 3385 (drinking water) ARGs mainly associated with efflux systems. The genes encoding metallo-ß-lactamase enzymes (blaAIM, blaGIM, blaIMP, and blaVIM) were detected in the two watersheds and in drinking water samples. Moreover, we demonstrated the presence of the colistin resistance genes mcr-3 and mcr-4 (both watersheds) and mcr-9 (drinking water and Guandu) for the first time in Brazil. Our data emphasize the importance of introducing measures to reduce the disposal of antibiotics and other pollutants capable of promoting the occurrence and spread of the microbial resistome on aquatic environments and predicting possible negative impacts on human health.


Assuntos
Água Potável , Poluentes Ambientais , Microbiota , Animais , Humanos , Água Potável/microbiologia , Brasil , Antibacterianos/farmacologia , Genes Bacterianos
4.
Front Microbiol ; 13: 893474, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35711759

RESUMO

Due to recent developments in NGS technologies, genome sequencing is generating large volumes of new data containing a wealth of biological information. Understanding sequenced genomes in a biologically meaningful way and delineating their functional and metabolic landscapes is a first-level challenge. Considering the global antimicrobial resistance (AMR) problem, investments to expand surveillance and improve existing genome analysis technologies are pressing. In addition, the speed at which new genomic data is generated surpasses our capacity to analyze it with available bioinformatics methods, thus creating a need to develop new, user-friendly and comprehensive analytical tools. To this end, we propose a new web application, CABGen, developed with open-source software. CABGen allows storing, organizing, analyzing, and interpreting bioinformatics data in a friendly, scalable, easy-to-use environment and can process data from bacterial isolates of different species and origins. CABGen has three modules: Upload Sequences, Analyze Sequences, and Verify Results. Functionalities include coverage estimation, species identification, de novo genome assembly, and assembly quality, genome annotation, MLST mapping, searches for genes related to AMR, virulence, and plasmids, and detection of point mutations in specific AMR genes. Visualization tools are also available, greatly facilitating the handling of biological data. The reports include those results that are clinically relevant. To illustrate the use of CABGen, whole-genome shotgun data from 181 bacterial isolates of different species collected in 5 Brazilian regions between 2018 and 2020 were uploaded and submitted to the platform's modules.

5.
Infect Genet Evol ; 102: 105302, 2022 08.
Artigo em Inglês | MEDLINE | ID: mdl-35568335

RESUMO

The high rates of carbapenem resistance among Brazilian Pseudomonas aeruginosa isolates are mainly associated with the clone ST277 producing the carbapenemase SPM-1. Here, the complete genetic composition of a IncP plasmid harboring blaKPC-2 in isolates of this endemic clone carrying chromosomal blaSPM-1 was described using whole genome sequencing. These results confirm the association of these two carbapenemases in ST277 and also describe the genetic composition of a novel blaKPC-2-plasmid. Considering the fact that this association occurs in a high-risk clone, monitoring the dissemination of this plasmid should be a public health concern.


Assuntos
Infecções por Pseudomonas , Pseudomonas aeruginosa , Antibacterianos/farmacologia , Proteínas de Bactérias/genética , Brasil/epidemiologia , Humanos , Testes de Sensibilidade Microbiana , Plasmídeos/genética , Infecções por Pseudomonas/epidemiologia , Pseudomonas aeruginosa/genética , beta-Lactamases/genética
6.
Curr Microbiol ; 78(6): 2259-2263, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-33944984

RESUMO

Burkholderia cepacia complex (Bcc) comprises 24 related species genetically distinct, associated with high mortality in cystic fibrosis (CF) patients. Due to a high level of similarity among Bcc species, accurate identification has been problematic, and most conventional and automated phenotypic tests have shown low accuracy. We evaluated accuracy of MALDI-ToF MS decreasing the cut-off score value to distinguish Bcc species compared to recA gene sequencing. A total of 145 Bcc isolates were analyzed. B. vietnamiensis (41.37%), B. cenocepacia IIIA (23.44%), B. multivorans (20%), B. cenocepacia IIIB (11.03%), and B. contaminans (2.75%) among other species were identified by recA sequencing. MALDI-ToF MS identified 100% of Bcc isolates at the genus level and 53.1% at the species level. By decreasing cut-off values for ≥1.70, the correct identification at the species level increased to 74.5%. MALDI-ToF MS proved to be useful at the genus level identification, but it still requires improvements that allow more precise identification, requiring continuous updates and addition of new spectra to its database. A review of interpretative criteria is a field to be explored with a large collection of Bcc species.


Assuntos
Infecções por Burkholderia , Complexo Burkholderia cepacia , Fibrose Cística , Técnicas de Tipagem Bacteriana , Complexo Burkholderia cepacia/genética , Humanos , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz
7.
Front Med (Lausanne) ; 8: 635206, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33791325

RESUMO

Multidrug-resistant microorganisms are a well-known global problem, and gram-negative bacilli are top-ranking. When these pathogens are associated with bloodstream infections (BSI), outcomes become even worse. Here we applied whole-genome sequencing to access information about clonal distribution, resistance mechanism diversity and other molecular aspects of gram-negative bacilli (GNB) isolated from bloodstream infections in Brazil. It was possible to highlight international high-risk clones circulating in the Brazilian territory, such as CC258 for Klebsiella pneumoniae, ST79 for Acinetobacter baumannii and ST233 for Pseudomonas aeruginosa. Important associations can be made such as a negative correlation between CRISPR-Cas and K. pneumoniae CC258, while the genes bla TEM, bla KPC and bla CTX-M are highly associated with this clone. Specific relationships between A. baumannii clones and bla OXA-51 variants were also observed. All P. aeruginosa ST233 isolates showed the genes bla VIM and bla OXA486. In addition, some trends could be identified, where a new P. aeruginosa MDR clone (ST3079), a novel A. baumannii clonal profile circulating in Brazil (ST848), and important resistance associations in the form of bla VIM-2 and bla IMP-56 being found together in one ST233 strain, stand out. Such findings may help to develop approaches to deal with BSI and even other nosocomial infections caused by these important GNB.

8.
J Glob Antimicrob Resist ; 23: 331-333, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-33157281

RESUMO

OBJECTIVES: The present study reports the draft genome sequence of Staphylococcus aureus 4181, a strain involved in bovine mastitis that produces aureocin 4181, a broad-spectrum antimicrobial peptide (AMP). Inhibition of multidrug-resistant (MDR) staphylococci involved in human infections by S. aureus 4181 was also investigated. METHODS: A sequencing library was constructed using a Nextera XT DNA Library Preparation Kit (Illumina). Whole-genome shotgun sequencing was performed using an Illumina MiSeq System. The A5-miseq pipeline was employed for de novo genome assembly. Genome annotation was performed by the RAST server. The online automated tools BAGEL4 and antiSMASH v.5.0 were used for mining gene clusters encoding AMP production. The virulence potential of the strain was investigated employing online tools. Its inhibitory activity toward MDR staphylococcal isolates associated with human infections was tested by the deferred antagonism assay on brain-heart infusion agar medium. RESULTS: The total scaffold size was determined to be 2 719 949 bp, with a G + C content of 32.7%. Genome analyses revealed 2504 protein-coding sequences and 74 RNA-coding sequences as well as several genes encoding drug resistance and a single AMP gene cluster coding for aureocin 4181. Staphylococcus aureus 4181 exhibited a pathogenic potential and inhibited all MDR staphylococcal isolates tested as a target. CONCLUSIONS: This study describes the main features of the draft genome of S. aureus 4181, a strain that produces the third four-component bacteriocin described in the literature, namely aureocin 4181. This bacteriocin is a potential alternative drug to control MDR staphylococcal isolates involved in human infections.


Assuntos
Bacteriocinas , Infecções Estafilocócicas , Animais , Bovinos , Feminino , Humanos , Proteínas Citotóxicas Formadoras de Poros , Staphylococcus/genética , Staphylococcus aureus/genética
9.
Braz J Microbiol ; 51(4): 1747-1755, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32944872

RESUMO

The application of next-generation sequencing tools revealed that the cystic fibrosis respiratory tract is a polymicrobial environment. We have characterized the airway bacterial microbiota of five adult patients with cystic fibrosis during a 14-month period by 16S rRNA tag sequencing using the Illumina technology. Microbial diversity, estimated by the Shannon index, varied among patient samples collected throughout the follow-up period. The beta diversity analysis revealed that the composition of the airway microbiota was highly specific for each patient, showing little variation among the samples of each patient analyzed over time. The composition of the bacterial microbiota did not reveal any emerging pathogen predictor of pulmonary disease in cystic fibrosis or of its unfavorable clinical progress, except for unveiling the presence of anaerobic microorganisms, even without any established clinical association. Our results could potentialy help us to translate and develop strategies in response to the pathobiology of this disease, particularly because it represents an innovative approach for CF centers in Brazil.


Assuntos
Fibrose Cística/microbiologia , Microbiota , Sistema Respiratório/microbiologia , Adulto , Bactérias/classificação , Bactérias/genética , Bactérias/isolamento & purificação , Brasil , DNA Bacteriano/genética , Feminino , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Masculino , RNA Ribossômico 16S/genética , Análise de Sequência de DNA , Adulto Jovem
10.
Sci Rep ; 10(1): 13192, 2020 08 06.
Artigo em Inglês | MEDLINE | ID: mdl-32764694

RESUMO

Pseudomonas aeruginosa is one of the most common pathogens related to healthcare-associated infections. The Brazilian isolate, named CCBH4851, is a multidrug-resistant clone belonging to the sequence type 277. The antimicrobial resistance mechanisms of the CCBH4851 strain are associated with the presence of the bla[Formula: see text] gene, encoding a metallo-beta-lactamase, in combination with other exogenously acquired genes. Whole-genome sequencing studies focusing on emerging pathogens are essential to identify key features of their physiology that may lead to the identification of new targets for therapy. Using both Illumina and PacBio sequencing data, we obtained a single contig representing the CCBH4851 genome with annotated features that were consistent with data reported for the species. However, comparative analysis with other Pseudomonas aeruginosa strains revealed genomic differences regarding virulence factors and regulatory proteins. In addition, we performed phenotypic assays that revealed CCBH4851 is impaired in bacterial motilities and biofilm formation. On the other hand, CCBH4851 genome contained acquired genomic islands that carry transcriptional factors, virulence and antimicrobial resistance-related genes. Presence of single nucleotide polymorphisms in the core genome, mainly those located in resistance-associated genes, suggests that these mutations may also influence the multidrug-resistant behavior of CCBH4851. Overall, characterization of Pseudomonas aeruginosa CCBH4851 complete genome revealed the presence of features that strongly relates to the virulence and antibiotic resistance profile of this important infectious agent.


Assuntos
Genômica , Fenótipo , Pseudomonas aeruginosa/genética , Pseudomonas aeruginosa/metabolismo , beta-Lactamases/biossíntese , Antibacterianos/farmacologia , Farmacorresistência Bacteriana/genética , Genoma Bacteriano/genética , Ilhas Genômicas/genética , Polimorfismo de Nucleotídeo Único , Pseudomonas aeruginosa/efeitos dos fármacos
11.
BMC Genomics ; 21(1): 255, 2020 Mar 23.
Artigo em Inglês | MEDLINE | ID: mdl-32293244

RESUMO

BACKGROUND: The Brazilian endemic clone Pseudomonas aeruginosa ST277 carries important antibiotic resistance determinants, highlighting the gene coding for SPM-1 carbapenemase. However, the resistance and persistence of this clone is apparently restricted to the Brazilian territory. To understand the differences between Brazilian strains from those isolated in other countries, we performed a phylogenetic analysis of 47 P. aeruginosa ST277 genomes as well as analyzed the virulence and resistance gene profiles. Furthermore, we evaluated the distribution of genomic islands and assessed in detail the characteristics of the CRISPR-Cas immunity system in these isolates. RESULTS: The Brazilian genomes presented a typical set of resistance and virulence determinants, genomic islands and a high frequency of the CRISPR-Cas system type I-C. Even though the ST277 genomes are closely related, the phylogenetic analysis showed that the Brazilian strains share a great number of exclusively SNPs when compared to other ST277 genomes. We also observed a standard CRISPR spacers content for P. aeruginosa ST277, confirming a strong link between sequence type and spacer acquisition. Most CRISPR spacer targets were phage sequences. CONCLUSIONS: Based on our findings, P. aeruginosa ST277 strains circulating in Brazil characteristically acquired In163 and PAGI-25, which can distinguish them from strains that do not accumulate resistance mechanisms and can be found on the Asian, European and North American continents. The distinctive genetic elements accumulated in Brazilian samples can contribute to the resistance, pathogenicity and transmission success that characterize the ST277 in this country.


Assuntos
Proteínas de Bactérias/genética , Infecções por Pseudomonas/microbiologia , Pseudomonas aeruginosa/genética , beta-Lactamases/genética , Brasil/epidemiologia , Sistemas CRISPR-Cas , Células Clonais , Repetições Palindrômicas Curtas Agrupadas e Regularmente Espaçadas , Resistência Microbiana a Medicamentos/genética , Genoma Bacteriano , Ilhas Genômicas , Humanos , Filogenia , Polimorfismo de Nucleotídeo Único , Pseudomonas aeruginosa/patogenicidade
12.
Braz J Microbiol ; 51(3): 1125-1127, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31858443

RESUMO

Stenotrophomonas maltophilia is one of the Gram-negative bacilli most frequently found in the airways of cystic fibrosis patients. This opportunistic pathogen is intrinsically multidrug-resistant, and therefore, its treatment presents a challenge. The genetic characterization of S. maltophilia is largely unknown, especially from those strains that colonize/infect the airways of cystic fibrosis patients. This work reports the draft genome sequences of three S. maltophilia isolates recovered from the sputum of a cystic fibrosis pediatric patient in Southeast Brazil. Several resistance- and virulence-related genes were detected. Furthermore, one intact phage and one incomplete prophage region were also identified in all strains. Multilocus sequence typing showed that all strains belonged to a new sequence type (ST264). Interestingly, all S. maltophilia strains were genetically identical, showing persistence for at least 16 months. To our knowledge, this is the first report of S. maltophilia draft genome sequences obtained from a cystic fibrosis pediatric patient in Brazil.


Assuntos
Fibrose Cística/microbiologia , Genoma Bacteriano , Infecções por Bactérias Gram-Negativas/microbiologia , Stenotrophomonas maltophilia/genética , Antibacterianos/farmacologia , Sequência de Bases , Brasil , Humanos , Testes de Sensibilidade Microbiana , Tipagem de Sequências Multilocus , Stenotrophomonas maltophilia/efeitos dos fármacos , Stenotrophomonas maltophilia/isolamento & purificação
13.
J Appl Oral Sci ; 28: e20190198, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31800876

RESUMO

other: Pathological parameters have been indicated as tumor prognostic factors in oral carcinoma. OBJECTIVE: The objective of this study was to investigate the impact of pathological parameters on prognosis of patients affected only by tongue and/or floor of the mouth squamous cell carcinoma (SCC). METHODOLOGY: In total, 380 patients treated in the Brazilian National Cancer Institute (INCA) from 1999 to 2006 were included. These patients underwent radical resection followed by neck dissection. The clinical and pathological characteristics were recorded. The Kaplan-Meier method and Cox proportional hazards model were used in survival analysis. Overall survival (OS), cancer-specific survival (CSS) and disease-free interval (DFI) were estimated. Cox residuals were evaluated using the R software version 3.5.2. Worst OS, CSS and DFI were observed in patients with tumors in advanced pathological stages (p<0.001), with the presence of perineural invasion (p<0.001) and vascular invasion (p=0.005). RESULTS: Advanced pathological stage and the presence of a poorly differentiated tumor were independent prognostic factors for OS and CSS. However, advanced pathological stage and perineural invasion were independent predictors of a shorter OS, DFI and CSS. CONCLUSION: Pathological stage and perineural invasion were the most significant pathological variables in survival analysis in tongue and/or floor of the mouth SCC.


Assuntos
Carcinoma de Células Escamosas/patologia , Soalho Bucal/patologia , Neoplasias Bucais/patologia , Neoplasias da Língua/patologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Carcinoma de Células Escamosas/mortalidade , Carcinoma de Células Escamosas/cirurgia , Intervalo Livre de Doença , Feminino , Humanos , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Neoplasias Bucais/mortalidade , Neoplasias Bucais/cirurgia , Esvaziamento Cervical/métodos , Gradação de Tumores/métodos , Estadiamento de Neoplasias , Análise de Regressão , Fatores de Tempo , Neoplasias da Língua/mortalidade , Neoplasias da Língua/cirurgia , Adulto Jovem
14.
J. appl. oral sci ; 28: e20190198, 2020. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1056596

RESUMO

Abstract Pathological parameters have been indicated as tumor prognostic factors in oral carcinoma. Objective: The objective of this study was to investigate the impact of pathological parameters on prognosis of patients affected only by tongue and/or floor of the mouth squamous cell carcinoma (SCC). Methodology: In total, 380 patients treated in the Brazilian National Cancer Institute (INCA) from 1999 to 2006 were included. These patients underwent radical resection followed by neck dissection. The clinical and pathological characteristics were recorded. The Kaplan-Meier method and Cox proportional hazards model were used in survival analysis. Overall survival (OS), cancer-specific survival (CSS) and disease-free interval (DFI) were estimated. Cox residuals were evaluated using the R software version 3.5.2. Worst OS, CSS and DFI were observed in patients with tumors in advanced pathological stages (p<0.001), with the presence of perineural invasion (p<0.001) and vascular invasion (p=0.005). Results: Advanced pathological stage and the presence of a poorly differentiated tumor were independent prognostic factors for OS and CSS. However, advanced pathological stage and perineural invasion were independent predictors of a shorter OS, DFI and CSS. Conclusion: Pathological stage and perineural invasion were the most significant pathological variables in survival analysis in tongue and/or floor of the mouth SCC.


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Idoso , Idoso de 80 Anos ou mais , Neoplasias Bucais/patologia , Neoplasias da Língua/patologia , Carcinoma de Células Escamosas/patologia , Soalho Bucal/patologia , Esvaziamento Cervical/métodos , Fatores de Tempo , Neoplasias Bucais/cirurgia , Neoplasias Bucais/mortalidade , Neoplasias da Língua/cirurgia , Neoplasias da Língua/mortalidade , Carcinoma de Células Escamosas/cirurgia , Carcinoma de Células Escamosas/mortalidade , Análise de Regressão , Intervalo Livre de Doença , Estimativa de Kaplan-Meier , Gradação de Tumores/métodos , Estadiamento de Neoplasias
15.
Microbiol Resour Announc ; 8(49)2019 Dec 05.
Artigo em Inglês | MEDLINE | ID: mdl-31806738

RESUMO

Here, we report the draft genome sequence of Wohlfahrtiimonas chitiniclastica strain 20, isolated from a chicken carcass originated from indoor broiler farming and identified using matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry followed by sequencing of the 16S rRNA gene.

16.
J Glob Antimicrob Resist ; 19: 50-52, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31454564

RESUMO

OBJECTIVES: Here we report the draft genome sequence of Staphylococcus agnetis 3682, a strain producing agneticin 3682, a broad-spectrum lantibiotic with potential medical applications. The inhibitory activity of S. agnetis 3682 against multidrug-resistant methicillin-resistant Staphylococcus aureus (MRSA) isolates involved in human infections was also investigated. METHODS: A sequencing library was constructed using a Nextera XT DNA Library Preparation Kit. An Illumina MiSeq system was used to perform whole-genome shotgun sequencing. De novo genome assembly was performed using the A5-miseq pipeline. Staphylococcus agnetis 3628 genome annotation was performed by the RAST server, and BAGEL4 and antiSMASH v.4.0 platforms were used for mining bacteriocin gene clusters. The inhibitory activity of S. agnetis 3682 against 20 multidrug-resistant MRSA strains involved in human infections in two Brazilian hospitals was determined by the deferred antagonism assay on brain-heart infusion (BHI) agar plates. RESULTS: The total scaffold size was determined to be 2 502 817bp with a G+C content of 35.6%. Genome analyses revealed 2437 coding sequences, 76 RNA genes, 27 genes involved in drug resistance and 2 bacteriocinogenic gene clusters (for agneticin 3682 and hyicin 4244). Staphylococcus agnetis 3682 inhibited 80% of the MRSA isolates tested. CONCLUSION: This study describes the main features of the draft genome of S. agnetis 3682, a strain producing the first bacteriocin (agneticin 3682) reported in this species. A second gene cluster encoding a sactipeptide was also found in the bacterial chromosome. Agneticin 3682 shows a new potential application against clinical MRSA isolates.


Assuntos
Bacteriocinas/genética , Bacteriocinas/metabolismo , Bacteriocinas/farmacologia , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus/genética , Staphylococcus/metabolismo , Antibacterianos/farmacologia , Composição de Bases , Sequência de Bases , Brasil , Farmacorresistência Bacteriana Múltipla/genética , Genes Bacterianos/genética , Genoma Bacteriano , Humanos , Testes de Sensibilidade Microbiana , Família Multigênica , Infecções Estafilocócicas/microbiologia , Staphylococcus/isolamento & purificação
17.
Antonie Van Leeuwenhoek ; 112(6): 961-964, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30663019

RESUMO

We present a post-operative infection caused by a methicillin-resistant Staphylococcus aureus strain, previously isolated in the preoperative screening, in a patient submitted to femoral osteosynthesis, successfully treated with oral ciprofloxacin. The isolate exhibited in vitro resistance to ciprofloxacin, Staphylococcal Cassette Chromosome mec type IV, it was negative for the lukS-PV Panton-Valentine leucocidin gene and belonged to ST2594 in multilocus sequence typing analysis. Whole genome sequencing revealed a genome size of 2,818,289 base pairs. The annotated genomes of ST2594 and N315 strains were compared, looking for genes related to virulence and resistance. The lack of the tst, sec, sel genes, associated with a mutation in the clfA gene, may partially explain the low morbity in this case.


Assuntos
Staphylococcus aureus Resistente à Meticilina/isolamento & purificação , Complicações Pós-Operatórias/microbiologia , Infecções Estafilocócicas/microbiologia , Idoso de 80 Anos ou mais , Antibacterianos/farmacologia , Proteínas de Bactérias/genética , Ciprofloxacina/farmacologia , Farmacorresistência Bacteriana , Feminino , Genoma Bacteriano , Virilha/microbiologia , Humanos , Staphylococcus aureus Resistente à Meticilina/classificação , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/genética , Testes de Sensibilidade Microbiana , Complicações Pós-Operatórias/tratamento farmacológico , Período Pré-Operatório , Infecções Estafilocócicas/tratamento farmacológico , Fatores de Virulência/genética , Sequenciamento Completo do Genoma
18.
J Glob Antimicrob Resist ; 15: 99-100, 2018 12.
Artigo em Inglês | MEDLINE | ID: mdl-30172833

RESUMO

OBJECTIVES: Klebsiella pneumoniae carbapenemase (KPC) is the most widespread carbapenemase in Enterobacteriaceae in Brazil. Although its presence is not common in Pseudomonas aeruginosa, it has been increasingly reported. Here we report a draft genome sequence of a KPC-producing P. aeruginosa strain recovered from a bloodstream infection sample in Brazil. METHODS: The antimicrobial susceptibility of KPC-producing P. aeruginosa CCBH17348 was evaluated by the disk diffusion method, Etest and broth microdilution. Carbapenemase production was confirmed by colorimetric assay (Carba NP) and PCR. Genomic DNA was sequenced by Illumina MiSeq sequencing and was assembled using the A5-Miseq pipeline, and gene annotation was performed using RAST 2.0. The database ResFinder 2.1, CRISPRFinder and MLST website were used to identify resistance genes, clustered regularly interspaced short palindromic repeats (CRISPRs) and sequence types (STs), respectively. RESULTS: Isolate CCBH17348 was considered multidrug-resistant, was susceptible to fluoroquinolones, gentamicin and polymyxin, and belonged to a newly described ST (ST2584), carrying an IncQ1 plasmid with blaKPC-2 and aph(3')-VI genes. Other genes associated with resistance and virulence found in the genome were blaOXA-50, blaPAO, fosA, catB, mutation in oprD and mexT (MexEF-OprN efflux regulator), and exotoxin-encoding genes (exoS, exoY and exoT). CONCLUSIONS: This study highlights the potential risk of new STs of P. aeruginosa carrying blaKPC-2 and the potential spread of blaKPC-2 in an IncQ1 plasmid.


Assuntos
Bacteriemia/microbiologia , Proteínas de Bactérias/metabolismo , Genoma Bacteriano , Infecções por Pseudomonas/microbiologia , Pseudomonas aeruginosa/genética , beta-Lactamases/metabolismo , Antibacterianos/farmacologia , Proteínas de Bactérias/genética , Sequência de Bases , Brasil , Humanos , Tipagem de Sequências Multilocus , Pseudomonas aeruginosa/efeitos dos fármacos , Pseudomonas aeruginosa/isolamento & purificação , beta-Lactamases/genética
19.
Med. oral patol. oral cir. bucal (Internet) ; 23(1): e7-e12, ene. 2018. tab, graf
Artigo em Inglês | IBECS | ID: ibc-170297

RESUMO

Background: Lower lip squamous cell carcinoma (LLSCC) is a common malignancy of the head and neck, being mainly a consequence of a chronic exposure to ultraviolet (UV) light solar radiation. Here, we evaluated the clinicopathological profile of patients with photosensitive disorders (xeroderma pigmentosum, lupus erythematosus and albinism) that developed LLSCC. Material and Methods: Data from patients who had a diagnosed LLSCC with a prior xeroderma pigmentosum, lupus erythematosus or albinism diagnosis that were treated at INCA from 1999 to 2012 were collected from patients' medical records (n=16). The control group was composed of 68 patients with LLSCC without a medical history of photosensitivity. The clinicopathological data of this study population were collected and the association between these variables was analyzed by Fisher's exact test. Survival curves were constructed using the Kaplan-Meier method and compared by log-rank test. All statistical analyses were performed using SPSS statistics package. Results: The mean age of patients in the photosensitive and non-photosensitive groups was 42 years and 67 years, respectively (p<0.0001). A previous history of malignant diseases was more common in the photosensitive group (p=0.001). In both groups, most tumors showed a pathological stage I/II disease. Overall and cancer-specific survival were not statistically different. However, disease-free interval showed a significant difference (p=0.01) between the photosensitive and non-photosensitive patients. Conclusions: Photosensitive patients presented LLSCC at earlier age but it usually was not the primary tumor in these patients. Furthermore, a more aggressive pathological behavior was not seen when compared with tumors from non-photosensitive patients. The disease-free interval was lower in photosensitive patients, as expected (AU)


No disponible


Assuntos
Humanos , Masculino , Feminino , Criança , Adolescente , Adulto Jovem , Adulto , Pessoa de Meia-Idade , Idoso , Idoso de 80 Anos ou mais , Neoplasias Labiais/complicações , Carcinoma de Células Escamosas/complicações , Transtornos de Fotossensibilidade/diagnóstico , Xeroderma Pigmentoso/diagnóstico , Albinismo/diagnóstico , Transtornos de Fotossensibilidade/terapia , Raios Ultravioleta/efeitos adversos , Radiação Solar/efeitos adversos , Estimativa de Kaplan-Meier
20.
Genome Announc ; 5(44)2017 Nov 02.
Artigo em Inglês | MEDLINE | ID: mdl-29097478

RESUMO

The draft genome sequence of the aureocyclicin 4185-producing strain Staphylococcus aureus 4185 is presented. The assembly contains 2,789,721 bp and a G+C content of 32.8%. Genome analysis allowed us to determine the complete sequence of the bacteriocinogenic plasmid pRJ101 and to find another bacteriocin gene cluster encoded on the bacterial chromosome.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...