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在 Bacillus subtilis 染色体中确定 Tn916 整合和结合元件的插入位

Emily L Bean¹, Janet L Smith¹, Alan D Grossman¹

¹Department of Biology, Massachusetts Institute of Technology, Cambridge, MA.

|May 16, 2025

概括

像Tn916这样的整合性和结合性元素 (ICE) 在细菌之间转移基因. 这项研究绘制了Tn916在Bacillus subtilis中的插入点的地图,揭示了对AT丰富地区的偏好,并确定了特定的集成热点.

科学领域:

微生物学微生物学
细菌遗传学细菌遗传学
横向基因转移是指水平基因转移.

背景情况:

整合性和结合性元素 (ICE) 促进细菌的水平基因转移.
Tn916 是一种在各种克拉姆阳性基因中发现的具有良好的特征的ICE.
与许多ICE不同,TN916表现出广泛的染色体整合部位特异性.

研究的目的:

识别和绘制Tn916在Bacillus subtilis中的染色体整合部位.
确定共识整合动机,并分析插入站点偏好.
调查核相关蛋白 Rok 在 Tn916 整合特异性中的作用.

主要方法:

基因组分析大约105个独立的Tn916插入事件在Bacillus subtilis.
插入部位的测序和映射以确定染色体位置.
生物信息分析以确定共识的整合动机,并确定整合热点.
评估Tn916插入部位分布在Rok蛋白的存在和缺席中.

主要成果:

Tn916插入被映射到Bacillus subtilis染色体中的1554个不同的位置.
大约99%的插入发生在303个地点,在ykuC和ykyB之间确定了一个重要的热点.
协商一致的整合动机是富含AT的,类似于在Clostridioides difficile.中观察到的.
插入部位偏好在很大程度上独立于Rok蛋白质,尽管与Rok结合区域有一些重叠.

结论:

在Bacillus subtilis中,Tn916显示出定义的,尽管广泛的,集成位点特异性,有利于富含AT的序列.
一个特定的染色体区域作为Tn916集成的热点.
在这种情况下,与核相关的蛋白 Rok 并没有显著影响 Tn916 整合部位的选择.

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