DESCRIPTIONS OF MEDICAL FUNGI
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Descriptions of Medical Fungi 95<br />
Fusarium Link ex Fries<br />
a<br />
b<br />
Cultures of (a) Fusarium oxysporum complex showing purple pigmentation<br />
and (b) Fusarium fujikuroi complex showing pink pigmentation.<br />
Molecular Identification: Current species identification is on the basis of multilocus<br />
sequence data (Guarro 2013, O’Donnell et al. 2015, van Diepeningen et al. 2015).<br />
Internet-accessible validated databases dedicated to the identification of fusaria via<br />
nucleotide BLAST queries are available at FUSARIUM-ID at Pennsylvania State<br />
University (http://www.fusariumdb.org) and Fusarium MLST at the CBS-KNAW Fungal<br />
Biodiversity Centre (http://www.cbs.knaw.nl/Fusarium/).<br />
For sequence-based identification of Fusarium species (O’Donnell et al. 2015).<br />
1. Use EF-1α, RPB1 and/or RPB2. Use of at least two independent loci will increase<br />
the accuracy of identification.<br />
2. Fusarium MLST or FUSARIUM-ID are the recommended sequence databases,<br />
rather than GenBank.<br />
3. Ensure sequences are carefully edited and free of ambiguities.<br />
4. Ensure the species names associated with the top BLASTn matches are the same.<br />
If multiple species names have similar scores it may be necessary to sequence<br />
additional loci.<br />
Note: ITS and D1/D2 sequences are too conserved to resolve species limits of most<br />
fusaria. O’Donnell et al. (2015) recommend avoiding ITS or D1/D2 sequences from an<br />
unknown isolate to query GenBank, because >50% of the sequences from Fusarium<br />
species are misidentified in this database.<br />
Identifications based on morphology and/or ITS and D1/D2 sequences should<br />
be reported as species complexes. Sequencing of EF-1α, RPB1 and/or RPB2 is<br />
required for accurate species identification.<br />
MALDI-T<strong>OF</strong> MS: A comprehensive ‘in-house’ database of reference spectra allows<br />
accurate identification of Fusarium species complexes (Lau et al. 2013).<br />
References: Booth (1971, 1977), Domsch et al. (1980), McGinnis (1980), Burgess<br />
and Liddell (1983), Rippon (1988), Samson et al. (1995), de Hoog et al. (2000, 2015),<br />
O’Donnell et al. (2008, 2009a, 2009b, 2015), Balajee et al. (2009), Guarro (2013),<br />
Geiser et al. (2013), van Diepeningen et al. (2015), Salah et al. (2015), Tortorano et al.<br />
(2014).