The 'obligate diploid' Candida albicans forms mating-competent haploids.

The 'obligate diploid' Candida albicans forms mating-competent haploids.
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DOI:
10.1038/nature11865
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发表时间:
2013-02-07
期刊:
影响因子:
64.8
通讯作者:
Berman, Judith
Berman, Judith
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hickman, Meleah A.;Zeng, Guisheng;Forche, Anja;Hirakawa, Matthew P.;Abbey, Darren;Harrison, Benjamin D.;Wang, Yan-Ming;Su, Ching-hua;Bennett, Richard J.;Wang, Yue;Berman, Judith

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Candida albicans, the most prevalent human fungal pathogen, is considered to be an obligate diploid that carries recessive lethal mutations throughout the genome. Here we demonstrate thatC. albicanshas a viable haploid state that can be derived from diploid cells underin vitroandin vivoconditions, and that seems to arise through a concerted chromosome loss mechanism. Haploids undergo morphogenetic changes like those of diploids, including the yeast–hyphal transition, chlamydospore formation and a white-opaque switch that facilitates mating. Haploid opaque cells of opposite mating type mate efficiently to regenerate the diploid form, restoring heterozygosity and fitness. Homozygous diploids arise spontaneously by auto-diploidization, and both haploids and auto-diploids show a similar reduction in fitness,in vitroandin vivo, relative to heterozygous diploids, indicating that homozygous cell types are transient in mixed populations. Finally, we constructed stable haploid strains with multiple auxotrophies that will facilitate molecular and genetic analyses of this important pathogen.
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