MALDI-TOF mass spectrometry as a tool for the discrimination of high-risk Escherichia coli clones from phylogenetic groups B2 (ST131) and D (ST69, ST405, ST393)

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Novais, A (Author) Other; Sousa, C (Author) Other; de Dios Caballero, JD (Author) Other; Fernandez Olmos, A (Author) Other; Lopes, J (Author) Other; Ramos, H (Author) Other; Coque, TM (Author) Other; Canton, R (Author) Other; Peixe, L (Author) FFUP

Journal

Title: European Journal of Clinical Microbiology and Infectious Diseases

Vol. 33 No. 12

Pages: 1391-1399

ISSN: 0934-9723

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 31 Citations

Scopus - 38 Citations

Pubmed / Medline

Scientific classification

FOS: Medical and Health sciences > Health sciences

Other information

Authenticus ID: P-009-MRF

DOI: 10.1007/s10096-014-2071-5

Abstract (EN): Reliable, quick and low-cost methods are needed for the early detection of multidrug-resistant and highly virulent high-risk B2 and D Escherichia coli clones or clonal complexes (HiRCC). Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) seems to have a good discriminatory potential at different subspecies levels, but it was never evaluated for the discrimination of E. coli clones. We assessed the potential of MALDI-TOF MS coupled to multivariate data analysis to discriminate representative E. coli B2 and D HiRCC. Seventy-three E. coli isolates from B2 (including ST131 and B2 non-ST131 clones) and D (ST69, ST393, ST405) with variable pulsed-field gel electrophoresis (PFGE) patterns, origins and dates (1980-2010) were tested. MS spectra were acquired from independent extracts obtained from different plate cultures in two different Microflex LT MALDI-TOF devices (Bruker) after a standard extraction procedure. MALDI-TOF MS fingerprinting analysis revealed a good discriminatory ability between the four HiRCC analysed (ST131, ST69, ST405, ST393) and between B2 ST131 and other B2 non-ST131 isolates. Clusters defined by MALDI-TOF MS were consistent with the clonal complexes assigned by multilocus sequence typing (MLST), although differences were detected regarding the composition of clusters obtained by the comparison of PFGE profiles. We demonstrate, for the first time, that characteristic mass fingerprints of different E. coli HiRCC are sufficiently discriminatory and robust to enable their differentiation by MALDI-TOF MS, which might represent a promising tool for the optimisation of infection control, individual patient management and large-scale epidemiological studies of public health relevance. The good correlation between phenotypic and genotypic features further corroborates phylogenetic relationships delineated by MLST.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9