Rapid differentiation of Staphylococcus aureus subspecies based on MALDI-TOF MS profiles

Author:

Pérez-Sancho Marta12,Vela Ana I.12ORCID,Horcajo Pilar12,Ugarte-Ruiz María12,Domínguez Lucas12,Fernández-Garayzábal José F.12,de la Fuente Ricardo12

Affiliation:

1. VISAVET Health Surveillance Centre (Pérez-Sancho, Vela, Ugarte-Ruiz, Fernández-Garayzábal, Domínguez), Complutense University, Madrid, Spain

2. Animal Health Department, Veterinary Faculty (Vela, Horcajo, Fernández-Garayzábal, Domínguez, de la Fuente), Complutense University, Madrid, Spain

Abstract

Staphylococcus aureus encompasses 2 subspecies ( aureus and anaerobius) with significant differences in their epidemiology and pathogenicity. We evaluated the suitability of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) for the rapid identification of both subspecies using a panel of 52 S. aureus isolates (30 subsp. anaerobius and 22 subsp. aureus) recovered from different origins, countries, and years. The on-board library identification system correctly identified 42 of 52 (81%) S. aureus isolates at the species level with score values >2.0. Limited performance was observed for differentiation of S. aureus subspecies (particularly subsp. anaerobius). Visual inspection of MALDI-TOF MS profiles identified 5 subspecies-specific mass peaks ( m/ z 3430 and 6861 in S. aureus subsp. anaerobius, and m/ z 4046, 6890, and 8093 in S. aureus subsp. aureus) with 100% sensitivity and specificity values, which is potentially useful for differentiating these subspecies. The suitability of 3 models, Genetic Analysis (GA), Quick Classifier (QC), and Supervised Neural Network, for automatic identification of both subspecies was evaluated using the Recognition Capability (RC) and Cross Validation (CV) values provided by the on-board ClinProTools software. The GA and QC models reached RC and CV values of 100%. Both models were externally validated using a panel of 26 S. aureus isolates of both subspecies, with both models correctly classifying all isolates of both subspecies. MALDI-TOF MS coupled with ClinProTools software represents a rapid and simple approach for S. aureus subspecies discrimination.

Funder

Regional Government of Madrid structural funds and European Union

Publisher

SAGE Publications

Subject

General Veterinary

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