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Current Genetics

, Volume 46, Issue 4, pp 193–204 | Cite as

Cryptococcus neoformans mitochondrial genomes from serotype A and D strains do not influence virulence

  • Dena L. Toffaletti
  • Kirsten Nielsen
  • Fred Dietrich
  • Joseph Heitman
  • John R. PerfectEmail author
Research Article

Abstract

Cryptococcus neoformans is an encapsulated pathogenic yeast producing meningoencephalitis. Two primary strains in genetic studies, serotype A H99 and serotype D JEC21, possess dramatic differences in virulence. Since it has been shown that mitochondrial gene expression is prominent at the site of the infection and there are significant differences between mitochondrial gene structure and regulation between the serotype A and D strains, this study used AD hybrids to move serotype A and D mitochondria under different genomic influences. When the serotype D MATa strain is involved in the mating crosses, there is uniparental transmission of mitochondrial DNA, but with the serotype A MATa strain, mitochondrial DNA can be inherited from either parent and recombination in the mitochondrial genome may also occur. In virulence studies between serotype A and D strains, it was found that the primary genetic control of the virulence composite for growth in the central nervous system is encoded in the nuclear DNA and not through mitochondrial DNA.

Keywords

Cryptococcus neoformans Hybrids Inheritance Mitochondria Virulence 

Notes

Acknowledgements

This work was supported by National Institute for Allergy and Infectious Disease (NIAID)-sponsored grants (AI 28388, AI 44975) and as a part of the Duke University Mycology Research Unit.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Dena L. Toffaletti
    • 1
  • Kirsten Nielsen
    • 2
    • 3
  • Fred Dietrich
    • 2
  • Joseph Heitman
    • 2
    • 3
  • John R. Perfect
    • 1
    • 2
    Email author
  1. 1.Department of MedicineDuke University Medical CenterDurhamUSA
  2. 2.Department of Molecular Genetics and MicrobiologyDuke University Medical CenterDurhamUSA
  3. 3.Howard Hughes Medical InstituteDuke University Medical CenterDurhamUSA

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