Date Approved

2024

Graduate Degree Type

Thesis

Degree Name

Biomedical Sciences (M.H.S.)

Degree Program

Biomedical Sciences

First Advisor

Ian Cleary

Second Advisor

Derek Thomas

Third Advisor

Frank Sylvester

Fourth Advisor

Christopher Pearl

Academic Year

2023/2024

Abstract

C. albicans is a resident of the human microbiome. In healthy individuals, it’s a harmless organism. In immunocompromised hosts and certain environments, C. albicans may become harmful. While not fully understood, one way C. albicans may pose a threat is by changing its morphology. C. albicans may exist in yeast, pseudohyphal, and hyphal morphologic forms. Morphologic changes are under tight genetic control as specific genes are expressed in certain morphologies. C. albicans may modify this genetic regulation in response to spaceflight conditions and adjust its morphologic transitions accordingly. Phenotypic changes in response to a spaceflight environment may have implications for changes to cell adhesion and ultimately biofilm formation. To date, not all genes involved or associated with morphologic changes have been studied. This work examines whether four previously unstudied genes impact filamentation and biofilm formation when individually overexpressed. Collectively, these results support the idea that C. albicans cell morphology is sensitive to environmental conditions and gene overexpression.

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