[Detection of Virulence Genes in Pseudomonas aeruginosa Isolates by Polymerase Chain Reaction and Investigation of High-Risk Clones by Matrix Assisted Laser Desorption/ Ionization Time-of-Flight Mass Spectrometer Method].

Pseudomonas aeruginosa İzolatlarında Virülans Genlerinin Polimeraz Zincir Reaksiyonuyla Tespiti ve Yüksek Riskli Klonların Matriksle Desteklenmiş Lazer Desorpsiyon/İyonizasyon Uçuş Zamanı Kütle Spektrometresi Yöntemi ile Araştırılması.

Publisher: Ankara Mikrobiyoloji Dernegi Country of Publication: Turkey NLM ID: 7503830 Publication Model: Print Cited Medium: Print ISSN: 0374-9096 (Print) Linking ISSN: 03749096 NLM ISO Abbreviation: Mikrobiyol Bul Subsets: MEDLINE

Publication: Ankara : Ankara Mikrobiyoloji Dernegi
Original Publication: Ankara.

Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization* ; Pseudomonas aeruginosa*/genetics ; Pseudomonas aeruginosa*/isolation & purification ; Pseudomonas aeruginosa*/drug effects ; Pseudomonas aeruginosa*/pathogenicity ; beta-Lactamases*/genetics ; Virulence Factors*/genetics ; Polymerase Chain Reaction*; Humans ; Bacterial Proteins/genetics ; Pseudomonas Infections/microbiology ; Anti-Bacterial Agents/pharmacology ; Drug Resistance, Multiple, Bacterial/genetics ; Imipenem/pharmacology ; Meropenem/pharmacology ; Virulence/genetics

Pseudomonas aeruginosa is a non-fermentative gram-negative bacillus. Many virulence factors play a role in the pathogenesis of P.aeruginosa. The aim of this study was to early detection of ST111, ST175, ST235, ST253, ST395 which are named high-risk clones with increased epidemic potential due to multidrug resistance in P.aeruginosa isolates by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) method and to evaluate the relationship between high-risk clones and the presence of P.aeruginosa virulence factors and carbapenemase production genes.P.aeruginosa isolates (n= 100) found to be resistant to at least imipenem or meropenem antibiotics isolated from the various clinical samples in the medical microbiology laboratory between 01.01.2021 and 07.06.2022 were included in the study. For the detection of virulence genes uniplex polymerase chain reaction (PCR) for toxA and multiplex PCR for algD, plcN, lasB, plcH were performed in P.aeruginosa isolates. In the detection of carbapenemase genes, two separate multiplex PCRs used for blaKPC , blaNDM , blaVIM , blaOXA-48 and for blaIMP , blaSPM , blaSIM , blaGIM , blaGES . Investigation of the peaks specific to high-risk clones was performed by using VITEK®-MS (bioMérieux, France) system. P.aeruginosa isolates were mostly isolated from intensive care units (45%) and respiratory tract samples (46%). The antibiotic to which the isolates were found to be most susceptible was amikacin, while highest resistance was detected for piperacillin. In PCR results, toxA, lasB, plcH, plcN and algD were detected as 89%, 99%, 98%, 100%, 100%, respectively. When the presence of characteristic peaks belonging to high-risk clones was evaluated with MALDI-TOF MS, ST253 (7%) and ST175 (2%) were detected. The peaks specific to ST235 and ST395 clones were not detected in our study. blaVIM was detected in two isolates and blaGES-5 carbapenemase was detected in two isolates. Virulence factors were detected at high rates in both high-risk clones and other strains and no significant relationship was found between high-risk clones and virulence factors. Early detection of high-risk clones, identification of antimicrobial resistance mechanisms will help to develop strategic treatment options and prevent their worldwide spread.

EC 3.5.2.6 (beta-Lactamases)
0 (Virulence Factors)
EC 3.5.2.6 (carbapenemase)
0 (Bacterial Proteins)
0 (Anti-Bacterial Agents)
71OTZ9ZE0A (Imipenem)
FV9J3JU8B1 (Meropenem)

Date Created: 20240427 Date Completed: 20240427 Latest Revision: 20240427

20240428

10.5578/mb.202498112

38676582