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Original Article

Studies on the pink, adenine-deficient strains of Candida albicans

I. Cultural and morphological characteristics

&
Pages 48-59 | Published online: 09 Jul 2009
 

Abstract

Several pink or dark brown mutants of Candida albicans were obtained following exposure of the wild types to ultraviolet irradiation or ethyl methanesulfonate. Unlike the wild types, all the mutants required adenine and in addition the dark brown strain required valine and isoleucine for growth. The mutants accumulated the pigment in the cytoplasm either as localized granules or in a diffused form. They, however, did not differ from their parental strains in size and shape of yeast cells, fermentation and assimilation of sugars. Initially, the pink mutants were more resistant to amphotericin B, but upon passage on agar media for a prolonged period, they became as sensitive as the wild types. The pink strain produced less mycelium in vitro and in vivo, and were less virulent for mice, but more resistant to ultraviolet irradiation than the wild types.

Resumen

Se obtuvieron varias mutantes rosadas o marrón oscure de Candida albicans, después de expener cepas naturales a irradiaciones ultravioletas o metanosulfonato de etilo. Al contrario de las cepas naturales, tedas las mutantes requerian para su crecimiento adenina y además las marrón oscuras valina e isoleucina. Las mutantes acumulaban el pigmento en el citoplasma, bien como gránulos localizados o en una manera difusa. Sin embargo, no diferian de las cepas paternas en el tamaño y forma de las céululas levaduriformes, ni en la fermentación y asimilación de los azúcares. Inicialmente, las mutantes rosas eran mas resistentes a la anfotericina B, pero después de pases por un medio de agar durante un periodo large, se volvian tan sensibles como las cepas originales. La cepa rosada producia menos micelio in vitro e in vivo, y era menos virulenta para el ratón, pero mas resistente a las irradiaciones ultravioletas que las cepas naturales.

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