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Contrasting demographic histories revealed in two invasive populations of the dry rot fungus Serpula lacrymans
Molecular Ecology ( IF 4.9 ) Pub Date : 2021-05-06 , DOI: 10.1111/mec.15934
Inger Skrede 1 , Claude Murat 2 , Jaqueline Hess 1, 3 , Sundy Maurice 1 , Jørn Henrik Sønstebø 1 , Annegret Kohler 2 , Dominique Barry-Etienne 4 , Dan Eastwood 5 , Nils Högberg 6 , Francis Martin 2, 7 , Håvard Kauserud 1
Affiliation  

Globalization and international trade have impacted organisms around the world leading to a considerable number of species establishing in new geographic areas. Many organisms have taken advantage of human-made environments, including buildings. One such species is the dry rot fungus Serpula lacrymans, which is the most aggressive wood-decay fungus in indoor environments in temperate regions. Using population genomic analyses of 36 full genome sequenced isolates, we demonstrated that European and Japanese isolates are highly divergent and the populations split 3000–19,000 generations ago, probably predating human influence. Approximately 250 generations ago, the European population went through a tight bottleneck, probably corresponding to the fungus colonization of the built environment in Europe. The demographic history of these populations, probably lead to low adaptive potential. Only two loci under selection were identified using a Fst outlier approach, and selective sweep analyses identified three loci with extended haplotype homozygosity. The selective sweep analyses found signals in genes possibly related to decay of various substrates in Japan and in genes involved DNA replication and protein modification in Europe. Our results suggest that the dry rot fungus independently established in indoor environments in Europe and Japan and that invasive species can potentially establish large populations in new habitats based on a few colonizing individuals.

中文翻译:

在干腐菌 Serpula lacrymans 的两个入侵种群中揭示了对比的人口历史,在干腐菌 Serpula lacrymans 的两个入侵种群中揭示了对比的人口历史

全球化和国际贸易影响了世界各地的生物,导致大量物种在新的地理区域建立。许多生物都利用了人造环境,包括建筑物。一种这样的物种是干腐真菌Serpula lacrymans,这是温带地区室内环境中最具侵略性的木材腐烂真菌。通过对 36 个全基因组测序分离株的群体基因组分析,我们证明欧洲和日本的分离株高度分化,并且种群在 3000-19,000 代前分裂,可能早于人类影响。大约 250 代前,欧洲人口经历了一个严重的瓶颈,这可能与欧洲建筑环境的真菌定殖相对应。这些人群的人口历史,可能导致低适应潜力。使用F st仅鉴定了两个选择的基因座离群值方法和选择性扫描分析确定了三个具有扩展单倍型纯合性的基因座。选择性扫描分析发现基因中的信号可能与日本的各种底物的衰变有关,而在欧洲的基因中则涉及 DNA 复制和蛋白质修饰。我们的研究结果表明,干腐真菌在欧洲和日本的室内环境中独立建立,并且入侵物种可能会在基于少数殖民个体的新栖息地中建立大量种群。,全球化和国际贸易影响了世界各地的生物,导致大量物种在新的地理区域建立。许多生物都利用了人造环境,包括建筑物。一种这样的物种是干腐真菌Serpula lacrymans,这是温带地区室内环境中最具侵略性的木材腐烂真菌。通过对 36 个全基因组测序分离株的群体基因组分析,我们证明欧洲和日本的分离株高度分化,并且种群在 3000-19,000 代前分裂,可能早于人类影响。大约 250 代前,欧洲人口经历了一个严重的瓶颈,这可能与欧洲建筑环境的真菌定殖相对应。这些人群的人口历史,可能导致低适应潜力。使用F st仅鉴定了两个选择的基因座离群值方法和选择性扫描分析确定了三个具有扩展单倍型纯合性的基因座。选择性扫描分析发现基因中的信号可能与日本的各种底物的衰变有关,而在欧洲的基因中则涉及 DNA 复制和蛋白质修饰。我们的研究结果表明,干腐真菌在欧洲和日本的室内环境中独立建立,并且入侵物种可能会在基于少数殖民个体的新栖息地中建立大量种群。
更新日期:2021-06-09
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