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Mutagenesis of Candida albicans strain ATCC 26555 with N-methyl-nitro-N-nitrosoguanidine followed by plating on solid yeast nitrogen base-N-acetylglucosamine medium at 37 degrees C yielded colony morphology variants that were characterized as forming smooth colonies, in contrast to the rough colonies formed by the parental strain. One yeast monomorphic mutant, CAL4, was studied in detail. Strain CAL4 is defective in filamentous growth, unable to form hyphae or pseudohyphae in vivo and in vitro. These filamentous structures are not elicited by commonly used external stimuli such as serum. The mutant had no obvious alterations in its mannan, glucan or chitin content. The total quantity of non-covalently linked wall proteins was reduced in the mutant strain, but the electrophoretic pattern shown by these proteins was identical to that of proteins from the parental strain. CAL4 showed major differences from the parental strain in its formation of covalently linked wall proteins. An important aspect of these differences lay in the practical absence of proteins recognized by two monoclonal antibodies, 1B12 and 3H8, which are considered valuable tools in the diagnosis of candidiasis in part because they normally react strongly with all strains. The C. albicans mutant, blocked in yeast-mycelium transition, was avirulent in a mouse model, although it was able to grow in animal tissues.

Isolation and characterization of anavirulent Candida albicansyeast monomorphic mutant