Bacterial single-cell genomics enables phylogenetic analysis and reveals population structures from in vitro evolutionary studies

Bacterial single-cell genomics enables phylogenetic analysis and reveals population structures from in vitro evolutionary studies
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细菌单细胞基因组学能够进行系统发育分析,并通过体外进化研究揭示种群结构

DOI:
10.1101/2020.08.25.266213
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发表时间:
2020
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通讯作者:
Bawn M
Bawn M
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作者:
Bawn M

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单细胞DNA测序有可能揭示进化中细胞群体的详细层次结构。单细胞方法越来越多地用于研究人类衰老和癌症中的克隆进化,但尚未用于研究不断变化的微生物种群。在这里,我们提出了一个单一的细菌基因组分析的方法,使用单个细菌的FACS分离,然后进行全基因组扩增和测序。我们将其应用于沙门氏菌素超变菌株对抗生素应激(环丙沙星)的体外实验进化。通过分析来自人群的单个细胞中的序列多态性,我们确定了亚群的存在和患病率,这些亚群在先前被证明与环丙沙星敏感性相关的基因中具有获得性多态性。我们还能够确定暴露于抗生素压力的人群能够在保持多样性的同时产生耐药性。这种群体结构无法从大量序列数据中解析,我们的研究结果显示了高通量单细胞测序如何增强细菌进化的实验研究。
Single-cell DNA sequencing has the potential to reveal detailed hierarchical structures in evolving populations of cells. Single cell approaches are increasingly used to study clonal evolution in human ageing and cancer, but have not yet been deployed to study evolving microbial populations. Here, we present an approach for single bacterial genomic analysis using FACS isolation of individual bacteria followed by whole-genome amplification and sequencing. We apply this toin vitroexperimental evolution of a hypermutator strain ofSalmonellain response to antibiotic stress (ciprofloxacin). By analysing sequence polymorphisms in individual cells from the population we identified the presence and prevalence of sub-populations which have acquired polymorphisms in genes previously demonstrated to be associated with ciprofloxacin susceptibility. We were also able to identify that the population exposed to antibiotic stress was able to both develop resistance whilst maintaining diversity. This population structure could not be resolved from bulk sequence data, and our results show how high-throughput single-cell sequencing can enhance experimental studies of bacterial evolution.
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