Tomas A Peña, Pablo Villarreal, Nicolas Agier, Matteo De Chiara, Tomas Barría, Kamila Urbina, Carlos A Villarroel, Ana R O Santos, Carlos A Rosa, Roberto F Nespolo, Gianni Liti, Gilles Fischer, Francisco A Cubillos
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引用次数: 0
摘要
由于可用于准确划分物种的标记有限,微生物的物种划分具有挑战性。在这里,我们采用了一种综合分类方法,将广泛采样、基于全基因组序列的分类、表型分析和种间生殖隔离评估结合起来。我们的研究揭示了巴塔哥尼亚沿海诺托法格森林中存在一个独特的酵母菌系。全基因组测序和种群分析表明,这一被命名为 Saccharomyces chiloensis sp.南美洲-C(SA-C)巴塔哥尼亚沿海种群形成了一个独特的支系,与之前描述的来自大洋洲(AUS,发现于澳大利亚和新西兰)的 S. uvarum 种群密切相关。相对于 S. uvarum,SA-C 和 AUS 的正交平均核苷酸同一性(OANI)较低,仅为 93%,低于建议的物种划分阈值 95%,这表明它们是一个独立的进化系。杂交孢子活力评估提供了令人信服的证据,证明 SA-C 和 AUS 在生殖上与 S. uvarum 隔离。此外,我们还发现了 S. chiloensis sp. nov.种系之间独特的结构变异,包括大规模染色体易位和倒位,以及独特的表型特征,强调了其种内遗传的独特性。我们认为,由于冰川作用,S. chiloensis sp.S. chiloensis sp. nov.的发现说明了巴塔哥尼亚沿海生物多样性的独特性,并强调了在物种划分中采用综合分类学方法揭示隐蔽微生物物种的重要性。S. chiloensis sp.
An integrative taxonomy approach reveals Saccharomyces chiloensis sp. nov. as a newly discovered species from Coastal Patagonia.
Species delineation in microorganisms is challenging due to the limited markers available for accurate species assignment. Here, we applied an integrative taxonomy approach, combining extensive sampling, whole-genome sequence-based classification, phenotypic profiling, and assessment of interspecific reproductive isolation. Our work reveals the presence of a distinct Saccharomyces lineage in Nothofagus forests of coastal Patagonia. This lineage, designated Saccharomyces chiloensis sp. nov., exhibits 7% genetic divergence from its sister species S. uvarum, as revealed by whole-genome sequencing and population analyses. The South America-C (SA-C) coastal Patagonia population forms a unique clade closely related to a previously described divergent S. uvarum population from Oceania (AUS, found in Australia and New Zealand). Our species reclassification is supported by a low Ortho Average Nucleotide Identity (OANI) of 93% in SA-C and AUS relative to S. uvarum, which falls below the suggested species delineation threshold of 95%, indicating an independent evolutionary lineage. Hybrid spore viability assessment provided compelling evidence that SA-C and AUS are reproductively isolated from S. uvarum. In addition, we found unique structural variants between S. chiloensis sp. nov. lineages, including large-scale chromosomal translocations and inversions, together with a distinct phenotypic profile, emphasizing their intraspecies genetic distinctiveness. We suggest that S. chiloensis sp. nov diverged from S. uvarum in allopatry due to glaciation, followed by post-glacial dispersal, resulting in distinct lineages on opposite sides of the Pacific Ocean. The discovery of S. chiloensis sp. nov. illustrates the uniqueness of Patagonia's coastal biodiversity and underscores the importance of adopting an integrative taxonomic approach in species delineation to unveil cryptic microbial species. The holotype of S. chiloensis sp. nov. is CBS 18620T.
期刊介绍:
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