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Intraspecific ITS Variability in the Kingdom Fungi as Expressed in the International Sequence Databases and Its Implications for Molecular Species Identification

R. Henrik Nilsson ; Erik Kristiansson (Institutionen för matematiska vetenskaper, matematisk statistik) ; Martin Ryberg ; Nils Hallenberg ; Karl-Henrik Larsson
Evolutionary Bioinformatics (1176-9343). Vol. 2008 (2008), 4, p. 193-201.
[Artikel, refereegranskad vetenskaplig]

The internal transcribed spacer (ITS) region of the nuclear ribosomal repeat unit is the most popular locus for species identification and subgeneric phylogenetic inference in sequence­based mycological research. The region is known to show certain variability even within species, although its intraspecific variability is often held to be limited and clearly separated from interspecific variability. The existence of such a divide between intra and interspecific variability is implicitly assumed by automated approaches to species identification, but whether intraspecific variability indeed is negligible within the fungal kingdom remains contentious. The present study estimates the intraspecific ITS variability in all fungi presently available to the mycological community through the international sequence databases. Substantial differences were found within the kingdom, and the results are not easily correlated to the taxonomic affiliation or nutritional mode of the taxa considered. No single unifying yet stringent upper limit for intraspecific variability, such as the canonical 3 % threshold, appears to be applicable with the desired outcome throughout the fungi. Our results caution against simplified approaches to automated ITSbased species delimitation and reiterate the need for taxonomic expertise in the translation of sequence data into species names.

Nyckelord: transcribed spacer regions, medically important yeasts, ectomycorrhizal fungi, dna barcodes, phylogenetic inference, ribosomal dna, taxonomy, diversity, evolutionary, networks

Denna post skapades 2009-08-21. Senast ändrad 2010-01-28.
CPL Pubid: 96288


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Institutionen för växt- och miljövetenskaper (2006-2011)
Institutionen för matematiska vetenskaper, matematisk statistik (2005-2016)


Biologiska vetenskaper
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