卢格杜宁失活机制的分子特征及其与斯塔菲洛科克斯卢格杜宁斯基因类型的关联
Lee-Chung Lin1, Cheng-Yen Kao2, Shih-Cheng Chang3
1Department of Laboratory Medicine, Linkou Chang Gung Memorial Hospital, Taoyuan, Taiwan.
概括
斯塔菲洛科克斯 (Staphylococcus lugdunensis) 产生的卢格杜宁的缺陷与特定的分子类型有关. 遗传突变,包括删除和插入的操作子,解释了为什么大多数临床分离物不产生这个重要的化合物.
科学领域:
- 微生物学 微生物学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 卢格杜宁是一种由Staphylococcus lugdunensis生产的抗菌化合物.
- 之前的研究表明,S. lugdunensis的基因型之间,lugdunin的活性有所不同,大多数隔离物缺乏这种活性.
研究的目的:
- 调查S. lugdunensis的临床分离物体中缺陷的lugdunin生产背后的遗传原因.
主要方法:
- 对36个S. lugdunensis分离物全基因组测序数据的比较分析.
- 检查了152个临床S. lugdunensis分离物,检查了影响lug operon基因的特定突变类型.
- 使用PCR和测序来识别删除,移动遗传元素 (MGE) 插入和无意义突变.
主要成果:
- 确定了三种主要突变类型:lug操作基因删除,IS256插入lugA (在ST3分离物中常见),以及lugB和lugC的无意义突变 (在CRISPR-Cas IIIA菌株中常见,特别是ST6).
- 克里斯普尔-卡斯IIC分离物 (ST27,ST4,ST29) 显示几乎完全丧失了路格运基因.
- 在CRISPR-Cas IIIA菌株中经常观察到无意义突变.
结论:
- 斯塔菲洛科克斯 (Staphylococcus lugdunensis) 的分子类型与导致Lugdunin生产缺陷的机制有关.
- 在许多临床隔离物体中,lug操作子内的遗传变异是导致许多临床隔离物体缺乏lugdunin活性的原因.
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