Multiple chromosomal and phenotypic changes in spontaneous mutants of Candida albicans.

Multiple chromosomal and phenotypic changes in spontaneous mutants of Candida albicans.
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白色念珠菌自发突变体的多种染色体和表型变化。

DOI:
10.1099/00221287-139-6-1195
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发表时间:
1993
期刊:
Journal of general microbiology
影响因子:
--
通讯作者:
Howard,DH
Howard,DH
中科院分区:
--
文献类型:
--
作者:
Rustchenko-Bulgac,EP;Howard,DH

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以往的研究表明,白色念珠菌的自发菌落突变株和临床分离株中存在多种染色体变异。在这份报告中,我们表明,这种核型改变也被认为是在自发和诱导非发芽突变体的真菌。为了确定除了菌落形态和显微形态之外的表型变化是否伴随电泳核型的重排,我们研究了非萌发突变体和一些殖民地形成突变体的以下特征:假菌丝的形成,厚垣孢子的产生,芽管的形成,菌落形态,营养缺陷型,在不同温度下的生长,以及在选择的培养基(亚硫酸铋和荧光桃红B)上的菌落形态和色素形成。我们确定自发的非萌发突变体的表型和核型变异性与自发的菌落形成突变体的表型和核型变异性没有什么不同。因此,不萌发可能代表了C基因组不稳定性的另一个表型结果。白色念珠菌。突变体之间发生的表型属性的变异性与任何给定的核型无关。此外,观察到的低或高表型变异性都不能用有限数量的染色体中相对较高的变异数量来解释。
Previous studies have revealed the occurrence of multiple chromosomal alterations among spontaneous colony form mutants and clinical isolates ofCandida albicans. In this report we show that such karyotype alterations are also seen in spontaneous and induced non-germinative mutants of the fungus. To determine if phenotypic changes other than colony form and microscopic morphology accompanied the rearrangements of the electrophoretic karyotype, we studied the following characteristics of the non-germinative and some of the colony form mutants: formation of pseudohyphae, chlamydospore production, germ tube formation, colony morphology, auxotrophy, growth at various temperatures, and colony morphology and pigment formation on selected media (bismuth sulphite and Phloxine B). We established that phenotypic and karyotypic variability among spontaneous, non-germinative mutants was no different than such variability amongspontaneous colony form mutants. Thus, non-germination may represent another phenotypicconsequence of genomic instability inC. albicans. The variability indifferent phenotypic attributes that occurred amongst the mutants was not associated with any given karyotype. Moreover, neither the low nor the high phenotypic variabilities observed were explained by the relatively high number of alterations in a limited number of chromosomes.
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