Differentiation of Gastric Species Using MALDI-TOF Mass Spectrometry

Overview

Journal Pathogens

Date 2021 Apr 3

PMID 33803832

Citations 9

Authors

Helena Berlamont

Chloe De Witte

Sofie De Bruyckere

James G Fox

Steffen Backert

Annemieke Smet

Filip Boyen

Freddy Haesebrouck

Affiliations

Soon will be listed here.

Abstract

Gastric helicobacters ( () and non- species (NHPHs)) colonize the stomach of humans and/or animals. species identification is essential since many of them are recognized as human and/or animal pathogens. Currently, species can only be differentiated using molecular methods. Differentiation between NHPHs using MALDI-TOF MS has not been described before, probably because these species are poorly represented in current MALDI-TOF MS databases. Therefore, we identified 93 gastric isolates of 10 different species using MALDI-TOF MS in order to establish a more elaborate reference database. While the MALDI Biotyper database was not able to correctly identify any of the isolates, the in-house database correctly identified all individual mass spectra and resulted in 82% correct species identification based on the two highest log score matches (with log scores ≥2). In addition, a dendrogram was constructed using all newly created main spectrum profiles. Nine main clusters were formed, with some phylogenetically closely related species clustering closely together and well-defined subclusters being observed in specific species. Current results suggest that MALDI-TOF MS allows rapid differentiation between gastric species, provided that an extensive database is at hand and variation due to growth conditions and agar-medium-related peaks are taken into account.

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