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解码异常:基于基因组的Bacillus cereus群株的基因组分析,与Bacillus anthracis密切相关

Thuto Gomolemo Magome¹, Marius Surleac^2,3, Ayesha Hassim⁴

¹Unit for Environmental Sciences and Management, Microbiology, North-West University, Potchefstroom, South Africa.

Frontiers in microbiology

|February 20, 2025

概括

基因组分析揭示了异常的Bacillus cereus群隔离物,需要标准化的分类学标准. 标准化Bacillus anthracis的分类与ANI ≥99%确保了分类学准确度.

科学领域:

微生物学微生物学
基因组学就是基因组学.
细菌的分类学细菌的分类学

背景情况:

谷菌群包括致病和非致病物种,如B. anthracis,B. cereus和B. thuringiensis.
这些物种,尽管有遗传相似性,但在形态学和病原性方面表现出显著的差异.
不一致的分类方法带来了分类学上的挑战,特别是对于类似于B. anthracis.的B. cereus分离物.

研究的目的:

在克鲁格国家公园从动物尸体中分离的B. cereus群体进行研究.
分析B. cereus群物种之间的基因组相似性和差异.
解决分类学上的差异,并提出标准化的分类标准.

主要方法:

对比基因组学,泛基因组学和全基因组单核酸多态 (wgSNP) 分析.
来自南非的九个新分离物种的测序.
对103个B. cereus群体基因组的分析,包括异常分离物.

主要成果:

一个不寻常的隔离物表现出B. cereus的特征,与B. anthracis相似的基因组相似性 (ANI ≥95%).
鉴定为B. anthracis的36个GenBank菌株显示出不同的基因组聚类和ANI值.
与B. anthracis<99%的ANI分离物显示出不同的遗传特征,与统一的B. anthracis不同.

结论:

标准化的分类学标准对于B. cereus群的分类至关重要,因为新出现的异常分离物.
目前的命名体系框架有效地将物种分为基因组和物种组.
建议在GenBank中指定具有≥99%ANI的分离物以引用B. anthracis作为典型的B. anthracis,以提高分类学清晰度.

关键词:

百日 (Bacillus anthracis) 是一种植物.百日谷类小麦 (Bacillus cereus) 的一个群体.平均核酸标识是什么泛基因组学是一种泛基因组学.整个基因组的测序.

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