Same-Sex Mating in Cryptococcus neoformans and Its Role in Genetic Diversity
Author Information
Author(s): Lin Xiaorong, Patel Sweta, Litvintseva Anastasia P., Floyd Anna, Mitchell Thomas G., Heitman Joseph
Primary Institution: Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina, United States of America
Hypothesis
Diploid α/α isolates would be present in the largely unisexual Cryptococcus serotype A population.
Conclusion
The study found that unisexual mating produces diploid isolates of C. neoformans in nature, contributing to genetic diversity.
Supporting Evidence
- Approximately 8% of the tested C. neoformans isolates were found to be diploid.
- The majority of diploid isolates were serotype A with two copies of the α MAT locus allele.
- Some diploids resulted from fusion of genetically distinct α cells, while others arose via endoreplication or clonal mating.
- Phylogenetic analysis indicated that diploid strains are genetically distinct, suggesting multiple independent origins.
Takeaway
Some fungi can mate with themselves, and this study shows that this helps them create more types of themselves, which is important for their survival.
Methodology
The study tested 489 natural C. neoformans isolates for ploidy using fluorescence flow cytometry.
Limitations
The study did not find any natural triploids or tetraploids, suggesting instability of higher ploidy.
Participant Demographics
Isolates were collected from six continents including Asia, Africa, Australia, Europe, and North and South Americas.
Digital Object Identifier (DOI)
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