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首页> 外文期刊>Journal of Clinical Microbiology >Clonal Reproduction and Limited Dispersal in an Environmental Population of Cryptococcus neoformans var. gattii Isolates from Australia
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Clonal Reproduction and Limited Dispersal in an Environmental Population of Cryptococcus neoformans var. gattii Isolates from Australia

机译：新型隐球菌环境种群中的克隆繁殖和有限扩散。 gattii来自澳大利亚的分离物

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Cryptococcus neoformans var. gattii is a causative agent of cryptococcosis and is thought to have a specific ecological association with a number of Eucalyptus species in Australia. However, the role that the tree plays in the life cycle of the fungus and the nature of the infectious propagule are not well understood. This study set out to examine whether sexual recombination is occurring in a natural population of C. neoformans var. gattii and whether the fungus disseminates between colonized trees. Thirty C. neoformans var. gattii isolates, consisting of both the α and a mating types, were collected from 13 Eucalyptus camaldulensis trees growing along a riverbank in Renmark, South Australia. The genetic diversity within the population was studied by using amplified fragment length polymorphism fingerprinting, and each isolate was assigned a unique multilocus genotype. Population genetic analyses of the multilocus data found no evidence of genetic exchange between members of the population, indicating a clonal population structure. Canonical variate analysis was then used to study the relationship between isolates from different colonized trees. Isolates from individual trees were strongly correlated, and it appeared that dispersal between trees was not occurring to any appreciable extent. These results suggest that the eucalypt may not be the primary niche for C. neoformans var. gattii but that the decaying wood present in hollows on these trees may provide a favorable substrate for extensive clonal propagation of the yeast cells.
机译：新型隐球菌变种。 gattii 是隐球菌病的病原体，被认为与澳大利亚的许多 Eucalyptus 物种都有特定的生态联系。但是，人们对树在真菌的生命周期中所起的作用以及传染性繁殖体的性质尚不十分了解。这项研究旨在检查在自然人群中是否发生性重组。新甲虫 var。 gattii 以及真菌是否在定植的树木之间传播。三十C.新甲虫 var。从南澳大利亚Renmark沿河岸生长的13棵桉树中收集了由α和 a 交配类型组成的 gattii 分离株。使用扩增的片段长度多态性指纹图谱研究了种群内的遗传多样性，并为每个分离株分配了独特的多位点基因型。对多基因座数据的群体遗传分析发现，没有证据表明种群成员之间存在遗传交换，表明种群结构呈克隆性。然后使用典型变量分析来研究来自不同殖民地树木的分离株之间的关系。来自各个树木的分离物之间具有很强的相关性，并且似乎树木之间的分散并没有发生任何明显的程度。这些结果表明，桉树可能不是 C的主要生态位。新甲虫 var。 gattii ，但是这些树洞中存在的腐烂木材可能为酵母细胞的广泛克隆繁殖提供了有利的基质。

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