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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

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Six monophyletic lineages identified within Cryptococcus neoformans and Cryptococcus gattii by multi-locus sequence

M Bovers¹, F Hagen, E E Kuramae

¹CBS - Fungal Biodiversity Centre, Utrecht, The Netherlands.

Fungal Genetics and Biology : FG & B

|February 12, 2008

Summary

This study reveals that the pathogenic yeasts Cryptococcus neoformans and Cryptococcus gattii contain distinct lineages. Multi-locus sequence typing supports classifying four genotypic groups within Cryptococcus gattii as separate taxa.

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Area of Science:

Medical Mycology
Molecular Biology
Yeast Taxonomy

Background:

Cryptococcus neoformans and Cryptococcus gattii are pathogenic yeasts with six known haploid genotypic groups.
C. neoformans is classified into varieties grubii and neoformans.
C. gattii genotypic groups lack formal taxonomic descriptions.

Purpose of the Study:

To investigate the phylogenetic lineages of C. neoformans and C. gattii.
To determine if existing genotypic groups represent distinct evolutionary lineages.
To assess the taxonomic status of C. gattii genotypic groups.

Main Methods:

Multi-locus sequence typing (MLST) was performed on 117 yeast isolates.
Six distinct genetic loci were analyzed for phylogenetic reconstruction.
Isolates represented all six known haploid genotypic groups.

Main Results:

Two distinct monophyletic lineages were identified within C. neoformans, confirming varieties grubii and neoformans.
Four distinct monophyletic lineages were consistently observed within C. gattii.
These C. gattii lineages corresponded to previously described genotypic groups.

Conclusions:

The current classification of C. neoformans varieties is supported by molecular data.
The four distinct lineages within C. gattii warrant recognition as separate taxa.
This research refines the taxonomy of pathogenic Cryptococcus species.