Variation in assimilating functions occurs in spontaneous Candida albicans mutants having chromosomal alterations.

Microbiology
E RustchenkoF Sherman

Abstract

In this study, four clinical isolates and over 100 colony morphology mutants, previously derived spontaneously from strain 3153A during growth on glucose medium, were examined for their utilization of 21 carbon and 3 nitrogen sources at various growth temperatures. The results demonstrated extensive variability in the pattern of assimilation among the mutants and strains, including both the gain and loss of assimilating functions. The persistent alterations in assimilation patterns observed in sequentially produced subclones illustrated an extensive ability of C. albicans populations to constantly produce new combinations of assimilating functions. The variability among spontaneous mutants derived from a single strain explains the well documented variability among natural isolates. From these results we established a relationship between the previously documented broad spectrum of spontaneous chromosomal aberrations in these mutants to the expression of genes controlling the utilization of alternative carbon and nitrogen sources. The existence of cryptic genes, responsible for growth on alternative substrates, was previously deduced from the analysis of other mutants obtained as a response to the restrictive condition on media ...Continue Reading

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