A phylogenetically-restricted essential cell cycle progression factor in the human pathogen Candida albicans

Chromosomal instability caused by cell division errors is associated with antifungal drug resistance in fungal pathogens. Here, we identify potential mechanisms underlying such instability by conducting an overexpression screen monitoring chromosomal stability in the human fungal pathogen Candida albicans. Analysis of similar to 1000 genes uncovers six chromosomal stability (CSA) genes, five of which are related to cell division genes of other organisms. The sixth gene, CSA6, appears to be present only in species belonging to the CUG-Ser clade, which includes C. albicans and other human fungal pathogens. The protein encoded by CSA6 localizes to the spindle pole bodies, is required for exit from mitosis, and induces a checkpoint-dependent metaphase arrest upon overexpression. Thus, Csa6 is an essential cell cycle progression factor that is restricted to the CUG-Ser fungal clade, and could therefore be explored as a potential antifungal target.

Automated summary

Chromosomal instability caused by cell division errors in fungal pathogens is associated with antifungal drug resistance. In this study, potential mechanisms of such instability were identified through an overexpression screen in Candida albicans. Six chromosomal stability (CSA) genes were discovered, one of which, CSA6, is restricted to the CUG-Ser fungal clade and could be explored as a potential antifungal target.