Eukaryotic Cell MMBR Online 2003
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Eukaryotic Cell, October 2003, p. 1036-1045, Vol. 2, No. 5
1535-9778/03/$08.00+0     DOI: 10.1128/EC.2.5.1036-1045.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Recapitulation of the Sexual Cycle of the Primary Fungal Pathogen Cryptococcus neoformans var. gattii: Implications for an Outbreak on Vancouver Island, Canada{dagger}

James A. Fraser,1,2 Ryan L. Subaran,1 Connie B. Nichols,1 and Joseph Heitman1,2,3,4*

Departments of Molecular Genetics and Microbiology,1 Medicine,3 Pharmacology and Cancer Biology,4 Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 277102

Received 27 June 2003/ Accepted 26 July 2003

Cryptococcus neoformans is a human fungal pathogen that exists as three distinct varieties or sibling species: the predominantly opportunistic pathogens C. neoformans var. neoformans (serotype D) and C. neoformans var. grubii (serotype A) and the primary pathogen C. neoformans var. gattii (serotypes B and C). While serotypes A and D are cosmopolitan, serotypes B and C are typically restricted to tropical regions. However, serotype B isolates of C. neoformans var. gattii have recently caused an outbreak on Vancouver Island in Canada, highlighting the threat of this fungus and its capacity to infect immunocompetent individuals. Here we report a large-scale analysis of the mating abilities of serotype B and C isolates from diverse sources and identify unusual strains that mate robustly and are suitable for further genetic analysis. Unlike most isolates, which are of both the a and {alpha} mating types but are predominantly sterile, the majority of the Vancouver outbreak strains are exclusively of the {alpha} mating type and the majority are fertile. In an effort to enhance mating of these isolates, we identified and disrupted the CRG1 gene encoding the GTPase-activating protein involved in attenuating pheromone response. crg1 mutations dramatically increased mating efficiency and enabled mating with otherwise sterile isolates. Our studies provide a genetic and molecular foundation for further studies of this primary pathogen and reveal that the Vancouver Island outbreak may be attributable to a recent recombination event.

* Corresponding author. Mailing address: Department of Molecular Genetics and Microbiology, 322 CARL Building, Research Dr., Duke University Medical Center, Durham, NC 27710. Phone: (919) 684-2824. Fax: (919) 684-5458. E-mail: heitm001{at}duke.edu.

{dagger} The supplemental material for this article may be found at http://ec.asm.org/.

Eukaryotic Cell, October 2003, p. 1036-1045, Vol. 2, No. 5
1535-9778/03/$08.00+0     DOI: 10.1128/EC.2.5.1036-1045.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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