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PLoS Genet. 2019 May 15;15(5):e1008137. doi: 10.1371/journal.pgen.1008137. eCollection 2019 May.

Selection of Candida albicans trisomy during oropharyngeal infection results in a commensal-like phenotype.

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Department of Biology, Bowdoin College, Brunswick, Maine, United States of America.
Division of Infectious Diseases, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, California, United States of America.
Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, Nebraska, United States of America.
Pacific Northwest Research Institute, Seattle, Washington, United States of America.
Singapore Immunology Network (SIgN), Agency of Science, Technology and Research (A*STAR), Singapore, Singapore.
School of Molecular Cell Biology and Biotechnology, Tel Aviv University, Tel Aviv, Israel.
Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America.


When the fungus Candida albicans proliferates in the oropharyngeal cavity during experimental oropharyngeal candidiasis (OPC), it undergoes large-scale genome changes at a much higher frequency than when it grows in vitro. Previously, we identified a specific whole chromosome amplification, trisomy of Chr6 (Chr6x3), that was highly overrepresented among strains recovered from the tongues of mice with OPC. To determine the functional significance of this trisomy, we assessed the virulence of two Chr6 trisomic strains and a Chr5 trisomic strain in the mouse model of OPC. We also analyzed the expression of virulence-associated traits in vitro. All three trisomic strains exhibited characteristics of a commensal during OPC in mice. They achieved the same oral fungal burden as the diploid progenitor strain but caused significantly less weight loss and elicited a significantly lower inflammatory host response. In vitro, all three trisomic strains had reduced capacity to adhere to and invade oral epithelial cells and increased susceptibility to neutrophil killing. Whole genome sequencing of pre- and post-infection isolates found that the trisomies were usually maintained. Most post-infection isolates also contained de novo point mutations, but these were not conserved. While in vitro growth assays did not reveal phenotypes specific to de novo point mutations, they did reveal novel phenotypes specific to each lineage. These data reveal that during OPC, clones that are trisomic for Chr5 or Chr6 are selected and they facilitate a commensal-like phenotype.

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