| Literature DB >> 27379069 |
Rafaella C Grenfell1, Afonso R da Silva Junior2, Gilda M B Del Negro3, Regina B Munhoz2, Viviane M F Gimenes3, Diego M Assis4, Anna C Rockstroh5, Adriana L Motta2, Flavia Rossi2, Luiz Juliano1, Gil Benard3, João N de Almeida Júnior6.
Abstract
Candida haemulonii is now considered a complex of two species and one variety: C. haemulonii sensu stricto, Candida duobushaemulonii and the variety C. haemulonii var. vulnera. Identification (ID) of these species is relevant for epidemiological purposes and for therapeutic management, but the different phenotypic commercial systems are unable to provide correct species ID for these emergent pathogens. Hence, we evaluated the MALDI-TOF MS performance for the ID of C. haemulonii species, analyzing isolates/strains of C. haemulonii complex species, Candida pseudohaemulonii and Candida auris by two commercial platforms, their databases and softwares. To differentiate C. haemulonii sensu sctricto from the variety vulnera, we used the ClinProTools(TM) models and a single-peak analysis with the software FlexAnalysis(TM). The Biotyper(TM) database gave 100% correct species ID for C. haemulonii sensu stricto, C. pseudohaemulonii and C. auris, with 69% of correct species ID for C. duobushaemulonii. Vitek MS(TM) IVD database gave 100% correct species ID for C. haemulonii sensu stricto, misidentifying all C. duobushaemulonii and C. pseudohaemulonii as C. haemulonii, being unable to identify C. auris. The Vitek MS(TM) RUO database needed to be upgraded with in-house SuperSpectra to discriminate C. haemulonii sensu stricto, C. duobushaemulonii, C. pseudohaemulonii, and C. auris strains/isolates. The generic algorithm model from ClinProTools(TM) software showed recognition capability of 100% and cross validation of 98.02% for the discrimination of C. haemulonii sensu stricto from the variety vulnera. Single-peak analysis showed that the peaks 5670, 6878, or 13750 m/z can distinguish C. haemulonii sensu stricto from the variety vulnera.Entities:
Keywords: Candida haemulonii complex species; ClinProToolsTM; MALDI-TOF mass spectrometry; Microflex LTTM; Vitek MSTM
Year: 2016 PMID: 27379069 PMCID: PMC4909767 DOI: 10.3389/fmicb.2016.00940
Source DB: PubMed Journal: Front Microbiol ISSN: 1664-302X Impact factor: 5.640
Denominations and GenBank accession numbers of the isolates and strains analyzed in this study.
| Isolate/strain | GenBank acession no. | Species |
|---|---|---|
| HCFMUSP01 | KT236448.1 | |
| HCFMUSP02 | KT968725.1 | |
| HCFMUSP03 | KT236449.1 | |
| HCFMUSP04 | KT968726.1 | |
| HCFMUSP05 | KT968713.1 | |
| HCFMUSP06 | KT968733.1 | |
| HCFMUSP07 | KT968734.1 | |
| HCFMUSP08 | KT968735.1 | |
| HCFMUSP09 | KT968714.1 | |
| HCFMUSP10 | KT257659.1 | |
| HCFMUSP11 | KT968727.1 | |
| HCFMUSP12 | KT968715.1 | |
| HCFMUSP13 | KT968716.1 | |
| HCFMUSP14 | KT968728.1 | |
| HCFMUSP15 | KT968729.1 | |
| HCFMUSP16 | KT968730.1 | |
| HCFMUSP17 | KT968717.1 | |
| HCFMUSP18 | KT968731.1 | |
| HCFMUSP19 | KT968718.1 | |
| HCFMUSP20 | KT968732.1 | |
| HCFMUSP21 | KT968719.1 | |
| HCFMUSP22 | KT968720.1 | |
| HCFMUSP23 | KT968721.1 | |
| HCFMUSP24 | KT968736.1 | |
| HCFMUSP25 | KT968737.1 | |
| HCFMUSP26 | KT968722.1 | |
| HCFMUSP27 | KT257660.1 | |
| HCFMUSP28 | KT968723.1 | |
| HCFMUSP29 | KT968738.1 | |
| HCFMUSP30 | KT968724.1 | |
| HCFMUSP31 | KT968739.1 | |
| HCFMUSP32 | KU365080.1 | |
| HCFMUSP33 | KU365081.1 | |
| IMT-USP01 | KX118598.1 | |
| HCFMUSP34 | KX118599.1 | |
| HCFMUSP35 | KX118600.1 | |
| HCFMUSP36 | KX118601.1 | |
| HCFMUSP37 | KX118602.1 | |
| CBS5149T | AB118789.1 | |
| CBS7798T | JX459765.1 | |
| CBS7799 | JX459766.1 | |
| CBS10004 | AB118791.1 | |
| CBS12310 | JX459678.1 | |
| CBS10913 | KF689018.1 | |
| CBS12766 | KC692039.1 | |
Performance of the different databases for the identification of .
| 16/16 (100) | 16/16 (100) | 16/16 (100) | 0/16 (0) | 16/16 (100) | |
| 0/0 (0) | 0/12 (0)4 | 0/12 (0)4 | 0/12 (0) | 0/12 (0)4,5 | |
| 9/13 (69) | 13/13 (100) | 0/13 (0)4 | 0/13 (0) | 13/13 (100) | |
| 2/2 (100) | 2/2 (100) | 0/2 (0)4 | 0/2 (0) | 2/2 (100) | |
| 2/2 (100) | 2/2 (100) | 0/2 (0) | 0/2 (0) | 2/2 (100) | |
Single-peak analysis for the discrimination of C. haemulonii sensu stricto and C. haemulonii variety vulnera.
| 5106 | 0.95 | 1.82 | <0.0001 | <0.0001 | 10.46 | 17.88 | 0.81 | 2.77 | 96.5 | 74.86 |
| 5670 | 0.93 | 1.94 | <0.0001 | <0.0001 | 16.65 | 18.85 | 0.90 | 3.01 | 94.77 | 77.05 |
| 6878 | 0.92 | 3.51 | <0.0001 | <0.0001 | 12.89 | 15.53 | 0.95 | 2.89 | 92.44 | 94.54 |
| 13750 | 0.96 | 1.51 | <0.0001 | <0.0001 | 5.09 | 59.01 | 0.98 | 6.04 | 94.19 | 96.17 |
| 14046 | 0.95 | 0.27 | <0.0001 | 0.00335 | 23.37 | 26.06 | 0.77 | 2.01 | 70.35 | 77.60 |