scholarly journals Rapid and cost-effective identification of Bartonella species using mass spectrometry

2009 ◽  
Vol 58 (9) ◽  
pp. 1154-1159 ◽  
Author(s):  
Pierre-Edouard Fournier ◽  
Carine Couderc ◽  
Sylvain Buffet ◽  
Christophe Flaudrops ◽  
Didier Raoult
Keyword(s):  
Mass Spectrometry ◽  
Species Identification ◽  
Chemical Reactivity ◽  
Bacterial Species ◽  
Cost Effective ◽  
Molecular Techniques ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Tof Ms

Bacteria of the genus Bartonella are emerging zoonotic bacteria recognized in a variety of human diseases. Due to their poor chemical reactivity, these fastidious bacteria are poorly characterized using routine phenotypic laboratory tests. Identification is usually achieved using molecular techniques that are time-consuming, expensive and technically demanding. Recently, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has emerged as a new technique for bacterial species identification. This study evaluated the use of MALDI-TOF MS for rapid genus and species identification of Bartonella species. Reference strains representing 17 recognized Bartonella species were studied. For each species, MS spectra for four colonies were analysed. The consensus spectrum obtained for each species was unique among spectra obtained for 2843 bacteria within the Bruker database, including 109 alphaproteobacteria. Thirty-nine additional blind-coded Bartonella strains were correctly identified at the species level, including 36 with a significant score. Altogether, these data demonstrate that MS is an accurate and reproducible tool for rapid and inexpensive identification of Bartonella species.

scholarly journals Rapid identification of Nocardia cyriacigeorgica from a brain abscess patient using MALDI-TOF-MS

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Mohammed AlMogbel ◽  
Mohammed AlBolbol ◽  
Noura Elkhizzi ◽  
Hisham AlAjlan ◽  
John Philip Hays ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Bacterial Species ◽  
Rapid Identification ◽  
Clinical Samples ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Nocardia Cyriacigeorgica ◽  
Diagnostic Microbiology ◽  
Tof Ms

Abstract Nocardia cyriacigeorgica (N. cyriacigeorgica) is most frequently associated with human infections, including chronic bronchitis, pulmonary disease and brain abscesses. In general, N. cyriacigeorgica causes infections in immunocompromised individuals and has been reported in clinical samples worldwide. However, the isolation and speciation of N. cyriacigeorgica in the routine diagnostic microbiology laboratory are complicated and time consuming. Recent mass spectrometry techniques such as matrix-assisted laser desorption/ionization time-of-flight-mass spectrometry (MALDI-TOF-MS) have been successfully integrated into many routine diagnostic microbiology laboratories, allowing for the rapid, accurate and simple identification and speciation of many different microorganisms, including difficult-to-identify bacterial species. Here, we present a case report of a 65-year-old female patient from the neurology ward of Prince Sultan Military Medical City in Riyadh, Saudi Arabia, who was infected with N. cyriacigeorgica. The bacterium was successfully identified by MALDI-TOF-MS, with species identification subsequently confirmed by sequence analysis of the 16S ribosomal RNA.

scholarly journals Application of MALDI-TOF mass spectrometry in clinical diagnostic microbiology

2014 ◽  
Vol 8 (09) ◽  
pp. 1081-1088 ◽  
Author(s):  
Elena De Carolis ◽  
Antonietta Vella ◽  
Luisa Vaccaro ◽  
Riccardo Torelli ◽  
Teresa Spanu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Drug Susceptibility ◽  
Biochemical Tests ◽  
Ionization Time ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Bacteria And Fungi ◽  
Diagnostic Microbiology ◽  
Tof Ms

Matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) has recently emerged as a powerful technique for identification of microorganisms, changing the workflow of well-established laboratories so that its impact on microbiological diagnostics has been unparalleled. In comparison with conventional identification methods that rely on biochemical tests and require long incubation procedures, MALDI-TOF MS has the advantage of identifying bacteria and fungi directly from colonies grown on culture plates in a few minutes and with simple procedures. Numerous studies on different systems available demonstrate the reliability and accuracy of the method, and new frontiers have been explored besides microbial species level identification, such as direct identification of pathogens from positive blood cultures, subtyping, and drug susceptibility detection.

scholarly journals MALDI-TOF Mass Spectrometry and Specific Biomarkers: Potential New Key for Swift Identification of Antimicrobial Resistance in Foodborne Pathogens

2019 ◽  
Vol 7 (12) ◽  
pp. 593 ◽  
Author(s):  
Maureen Feucherolles ◽  
Henry-Michel Cauchie ◽  
Christian Penny
Keyword(s):  
Mass Spectrometry ◽  
Antimicrobial Resistance ◽  
Foodborne Pathogens ◽  
Reference Method ◽  
Multi Drug Resistance ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
The Future ◽  
Tof Ms

Matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS) is today the reference method for direct identification of microorganisms in diagnostic laboratories, as it is notably time- and cost-efficient. In the context of increasing cases of enteric diseases with emerging multi-drug resistance patterns, there is an urgent need to adopt an efficient workflow to characterize antimicrobial resistance (AMR). Current approaches, such as antibiograms, are time-consuming and directly impact the “patient-physician” workflow. Through this mini-review, we summarize how the detection of specific patterns by MALDI-TOF MS, as well as bioinformatics, become more and more essential in research, and how these approaches will help diagnostics in the future. Along the same lines, the idea to export more precise biomarker identification steps by MALDI-TOF(/TOF) MS data towards AMR identification pipelines is discussed. The study also critically points out that there is currently still a lack of research data and knowledge on different foodborne pathogens as well as several antibiotics families such as macrolides and quinolones, and many questions are still remaining. Finally, the innovative combination of whole-genome sequencing and MALDI-TOF MS could be soon the future for diagnosis of antimicrobial resistance in foodborne pathogens.

scholarly journals Rapid identification of Legionella species by mass spectrometry

2010 ◽  
Vol 59 (3) ◽  
pp. 273-284 ◽  
Author(s):  
Claire Moliner ◽  
Christophe Ginevra ◽  
Sophie Jarraud ◽  
Christophe Flaudrops ◽  
Marielle Bedotto ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Bacterial Species ◽  
Rapid Identification ◽  
Species Level ◽  
Blind Test ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Tract Infections ◽  
Pcr Targeting ◽  
Tof Ms

Legionella species are facultative, intracellular bacteria that infect macrophages and protozoa, with the latter acting as transmission vectors to humans. These fastidious bacteria mostly cause pulmonary tract infections and are routinely identified by various molecular methods, mainly PCR targeting the mip gene and sequencing, which are expensive and time-consuming. Recently, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has emerged as a rapid and inexpensive method for identification of bacterial species. This study evaluated the use of MALDI-TOF-MS for rapid species and serogroup identification of 21 Legionella species recognized as human pathogens. To this end, a reference MS database was developed including 59 Legionella type strains, and a blind test was performed using 237 strains from various species. Two hundred and twenty-three of the 237 strains (94.1 %) were correctly identified at the species level, although ten (4.2 %) were identified with a score lower than 2.0. Fourteen strains (5.9 %) from eight species were misidentified at the species level, including seven (3.0 %) with a significant score, suggesting an intraspecific variability of protein profiles within some species. MALDI-TOF-MS was reproducible but could not identify Legionella strains at the serogroup level. When compared with mip gene sequencing, MALDI-TOF-MS exhibited a sensitivity of 99.2 and 89.9 % for the identification of Legionella strains at the genus and species level, respectively. This study demonstrated that MALDI-TOF-MS is a reliable tool for the rapid identification of Legionella strains at the species level.

scholarly journals Novel attempt at discrimination of a bullet-shaped siphonophore (Family Diphyidae) using matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-ToF MS)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nayeon Park ◽  
Jisu Yeom ◽  
Raehyuk Jeong ◽  
Wonchoel Lee
Keyword(s):  
Species Identification ◽  
Morphological Characteristics ◽  
Kuroshio Current ◽  
Northwest Pacific ◽  
Maldi Tof Ms ◽  
Protein Mass ◽  
Maldi Tof ◽  
Morphological Findings ◽  
Flight Mass Spectrometry ◽  
Tof Ms

AbstractOne major difficulty in identifying the gelatinous bodied bullet-shaped Siphonophore, Diphyids, is that their shape is deformed following ethanol fixation. Ethanol often is preferred over other fixatives, since samples fixed in ethanol can be used for molecular studies that can supplement morphological findings. To overcome this problem, we obtained protein mass spectra of ten species of Diphyidae found in the waters of the Kuroshio Current (Northwest Pacific and South Coast of South Korea) to test whether MALDI-ToF MS could be used as a methodology for species identification. In addition, a number of morphological characteristics that can be used with ethanol-treated samples was summarized. Concatenated phylogenetic analysis was also performed to determine the phylogenetic relationship by obtaining partial sequences of four genes (mtCOI, 16S rRNA, 18S rRNA, and ITS regions). Based on our integrative analysis, MALDI-ToF MS was evaluated as a potentially fast, inexpensive, and accurate tool for species identification along with conventional morphological and DNA barcoding for Diphyidae.

scholarly journals Matrix-assisted laser desorption/ionisation-time of flight mass spectrometry (MALDI-TOF MS) in clinical mircobiological routine diagnostics1)

2011 ◽  
Vol 35 (4) ◽  
pp. ---
Author(s):  
Sören Schubert ◽  
Andreas Wieser
Keyword(s):  
Mass Spectrometry ◽  
Time Of Flight ◽  
Laser Desorption ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Tract Infections ◽  
Tof Ms ◽  
Matrix Assisted Laser ◽  
Matrix Assisted Laser Desorption

Abstract Very recently a novel method for differentiation of bacteria and fungi was developed, that is, identification by means of matrix-assisted laser desorption/ionisation-time of flight mass spectrometry (MALDI-TOF MS). This differentiation relies on the exact measurement of species-specific protein spectra of ribosomal proteins. It is at least as accurate as conventional biochemical differentiation methods, but provides results within minutes. In addition to differentiation of bacteria and yeasts grown on agar plates, direct identification is feasible from positive blood cultures as well as from urine samples of patients suffering from urinary tract infections. Future developments of MALDI-TOF MS for clinical microbiological purposes include the detection of β-lactamase and carbapenemase activity as well as genotyping of bacteria below the species level.

scholarly journals High mass resolution MALDI-TOF MS for profiling biomolecules in mixtures

2018 ◽  
Author(s):  
Wenfa Ng
Keyword(s):  
Mass Spectrometry ◽  
Time Of Flight ◽  
High Sensitivity ◽  
Mass Resolution ◽  
High Mass ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
High Mass Resolution ◽  
Tof Ms

Intact biomolecules carry its identity through its atomic constituents and mass, while fragmented biomolecules require reconstruction for their identity to be retrieved. Hence, for profiling biomolecules in mixtures, the goal would be the gentle ionization of biomolecules by mass spectrometry without inducing fragmentation. Doing so generates an ensemble of ionized intact biomolecules able to be profiled by high sensitivity time-of-flight detector for accurate determination of each biomolecule mass, and thus, identity. Specifically, in time-of-flight detection, high mass resolution determination would require high sensitivity in detecting small differences in time of arrival of biomolecule ions to the detector. While current time-of-flight mass spectrometry provides high mass resolution, greater mass resolution is needed for discriminating different biomolecules in a mixture, where mass differences between biomolecules could be at the sub-Dalton level. With the ability to reliably detect biomolecules with sub-Dalton mass resolution, mass spectrometry with time-of-flight detector such as matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) could find use in identifying the compendium of biomolecules present in a mixture without tedious and time-consuming separation. The larger question would subsequently be coupling sample preparation needs with the conditions conducive for MALDI-TOF MS analysis. Overall, high mass resolution mass spectrometry techniques for profiling biomolecules would find use as an enabling tool in many areas of analytical science and biological sciences such as proteomics and metabolomics.

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