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Molecular investigation of high-level aminoglycoside resistance among Gram-negative bacilli isolated from cerebrospinal fluid and blood of hospitalized patients in Brazil

Grant number: 17/11707-9
Support Opportunities:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): September 04, 2017
Effective date (End): March 03, 2018
Field of knowledge:Biological Sciences - Microbiology - Applied Microbiology
Principal Investigator:Ana Lúcia da Costa Darini
Grantee:Anelise Stella Ballaben
Supervisor: Yohei Doi
Host Institution: Faculdade de Ciências Farmacêuticas de Ribeirão Preto (FCFRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Research place: University of Pittsburgh (Pitt), United States  
Associated to the scholarship:15/23484-9 - Molecular study of gram-negative beta-lactamase producing bacteria isolated from patients with suspected meningitis in the Ribeirão Preto region, BP.DD


Aminoglycosides have been used for the treatment of infections due to MDR (multidrug-resistant) Gram-negative pathogens. The high-level aminoglycoside resistance mediated by the production of 16S-RMTases has been described in Enterobacteriaceae and non-fermenting Gram-negative bacilli more frequently in recent years, reinforcing the important role that these enzymes play on the antimicrobial resistance scenario. The aim of this project is to investigate the molecular mechanisms of high-level aminoglycoside resistance among enterobacteria and non-fermenting Gram-negative bacilli isolated from cerebrospinal fluid and blood of patients with meningitis in different hospitals of Sao Paulo State, Brazil during 2007 to 2014. According to standard experiments, 19 high-level aminoglycoside-resistant isolates including 14 Pseudomonas aeruginosa, 3 Acinetobacter baumannii and 2 Klebsiella pneumoniae were selected to this study. For this proposal, we will evaluate the presence of aminoglycosides resistance genes in enterobacteria and non-fermenting Gram-negative bacilli, investigate the presence, number and size of plasmids carrying aminoglycoside resistance genes and sequencing the whole genome of Enterobacteriaceae and non-fermenting Gram-negative bacilli producing potential new aminoglycoside resistance genes. With this 6-month investigation, we will elucidate high-level aminoglycoside resistance among Gram-negative bacilli in Brazil. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BALLABEN, ANELISE S.; ANDRADE, LEONARDO N.; GALETTI, RENATA; FERREIRA, JOSEANE C.; MCELHENY, CHRISTI L.; METTUS, ROBERTA T.; DA SILVA, PAULO; GARCIA, DOROTI DE OLIVEIRA; DARINI, ANA LUCIA C.; DOI, YOHEI. Diversity of High-Level Aminoglycoside Resistance Mechanisms among Gram-Negative Nosocomial Pathogens in Brazil. Antimicrobial Agents and Chemotherapy, v. 62, n. 11, . (15/23484-9, 17/11707-9, 15/11728-0, 14/14494-8)

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